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Table of contents
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Table of contents

2:29
Principe de base de l'analyse dynamique
2:55
Hypothèses de base analyse temporelle
3:49
Méthodes disponibles
7:55
Définition de la fonction de variation du temps
8:30
Exemple: Modélisation des effets d'une foule d'après les règles SCI P354
38:37
Exemple: Modélisation d'un évènement accidentel
38:41
Exemple: Modélisation des effets dynamiques du déplacement d'une charge roulante
42:41
Exemple: Modélisation d'un amortisseur harmonique
46:29
Exemple: Modélisation de l'effet d'un séisme
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Video tags
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Video tags

Robot
Robot Structural Analysis
Autodesk Help
Support Autodesk
Webinar
Webinaire
Autodesk
Structural Analysis
Dynamique
Temporelle
Analyse temporelle
Séisme
Explosion
Moteur
Sinusoïdal
Subtitles
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Subtitles

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  • ruRussian
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00:00:00
so hello everyone and
00:00:01
welcome to this 13th webinar dedicated
00:00:04
to software and robots structure
00:00:05
analysis I am Guillaume Chazal
00:00:07
and I will initially be my colleague
00:00:08
François Oger who will answer
00:00:10
your questions during the presentation so
00:00:12
today's topic will be the analyst in
00:00:13
evidence first of all we
00:00:17
would like to remind you of two things
00:00:19
the first is that the recordings
00:00:20
of our previous sessions as well as
00:00:22
the associated powerpoint presentations
00:00:23
are available for download on
00:00:26
our forum and we reminded us is
00:00:28
to support the links allowing access
00:00:30
to downloading
00:00:32
the second concerns the announcement of the
00:00:35
sessions which is carried out via
00:00:36
email invitations on our blog forums
00:00:38
and possible social networks for
00:00:44
sedan you who do not know the
00:00:45
principle we also wanted to
00:00:47
remind a few points concerning the
00:00:49
webinars therefore its webinar sessions
00:00:50
aim to deal with a
00:00:51
particular subject which is generally
00:00:53
support oriented, that is to say with
00:00:55
the aim of providing one or more
00:00:57
solutions to the problems which
00:00:59
come up most frequently to us on
00:01:01
the subject but these sessions are composed
00:01:04
a presentation phase of
00:01:05
varying duration from 20 to 40 minutes during
00:01:07
which you can ask your questions at any time
00:01:09
and once the
00:01:10
presentation is finished the rest of the presentation
00:01:12
is devoted to answering your questions
00:01:15
during this slide we have grouped together the
00:01:18
links to the most
00:01:19
common resources such as the forum page
00:01:22
dedicated to technical articles the pages
00:01:24
concerning the which brings together the
00:01:27
additional tools added a robot the page
00:01:29
towards the toolbox in which
00:01:31
you can express in French or in
00:01:32
English asks you to development and
00:01:34
finally the page dedicated to the comments
00:01:35
of the webinars which you attended
00:01:36
and which contain among other things
00:01:38
therefore the answers to the questions that we
00:01:40
bring hard at the end of the session will be at the
00:01:42
end of each session
00:01:44
also take the opportunity to
00:01:45
announce the release of robots 2017 which
00:01:48
was released at the beginning of April as well as the
00:01:51
release of its service pack 1 so the
00:01:54
new features of this version are written
00:01:55
on the dedicated page of the forum which we
00:01:57
recalled on these repositories and the second link
00:01:59
will return to the page describing the
00:02:00
corrections made to service pack 1
00:02:02
of this dance wii version
00:02:06
we will present the temporal analysis
00:02:08
of euros so we will first recall
00:02:09
the basic hypotheses
00:02:11
for this type of analysis then we will see
00:02:13
through a succession of examples
00:02:14
how we can can define a year a
00:02:16
dynamic excitation how to describe
00:02:19
dynamic effects and finally what are
00:02:21
the types of results available and
00:02:22
how to exploit them
00:02:23
the next webinar will be devoted to
00:02:25
rolling loads first of all we
00:02:30
see here the basic equation of motion
00:02:32
it is the general formulation for an
00:02:34
imposed vibration therefore including the
00:02:36
mass matrix the stiffness matrix
00:02:38
and the damping matrix when we
00:02:40
define any dynamic analysis
00:02:41
of a robot the mass matrix is
00:02:43
constant and therefore it is in what
00:02:45
concerns the stiffness matrix it is
00:02:47
constant throughout the analysis except
00:02:48
for the non-linear static analysis and
00:02:50
for the analyst still go non-
00:02:51
linear to be able to create a
00:02:56
temporal analysis a modal analysis must be
00:02:59
created before creating
00:03:01
the analysis temporal so the reasons for
00:03:03
this is that the choice of the
00:03:05
mass matrix is ​​inherited in reality the analysis
00:03:06
of the parameters of the model analysis and in
00:03:09
the same way therefore the masses added
00:03:11
or converted in the model are
00:03:14
also inherited from this analysis
00:03:17
finally therefore in the case of using
00:03:20
the modal decomposition method
00:03:22
that we will see later the different
00:03:24
methods available for this
00:03:26
temporal analysis when using the anc the
00:03:29
method of monal compositions the
00:03:30
temporal analysis must be able to have a
00:03:32
direct access to the results of the goudal analysis
00:03:34
in fact the precision of the results that we
00:03:37
obtain for this within the framework of
00:03:39
the use of this method depends on the
00:03:41
number of modes which are calculated for
00:03:43
nadal then as you can see
00:03:49
for these two screenshots the number
00:03:52
of methods available for
00:03:53
temporal analysis is different for a
00:03:55
nonlinear or nonlinear analysis so the
00:03:57
available methods are listed in
00:03:59
the chronological order of appearance in
00:04:01
the program so the newmarke method
00:04:03
is the the oldest method which
00:04:05
appeared in robots and the
00:04:08
newmarke method of acceleration it is the most
00:04:09
recent when peace delta is checked in the
00:04:12
language parameters inherited from
00:04:13
the temporal analysis or that so-
00:04:15
called non-linear elements are present in the
00:04:17
model that is to say as for example
00:04:18
work bars in contraction
00:04:19
in this case the first two methods
00:04:22
automatically become unavailable
00:04:23
as we see on the capture on the right
00:04:29
then there are two ways allowing
00:04:31
to define the damping for this type
00:04:33
of analysis access to one or the other
00:04:35
depends on the method selected therefore
00:04:37
for the modal decomposition method
00:04:38
the damping must be assigned
00:04:40
directly to the vibration modes
00:04:41
you must pay attention to the fact that the
00:04:44
last damping value that you
00:04:45
enter in this dialog box
00:04:47
so the one we see on the left
00:04:50
will be used for all the following modes,
00:04:52
that is to say that let's imagine a case in
00:04:54
which I will have calculated said mode if I
00:04:56
define for example a depreciation of
00:04:58
2% for the first mode of 4 for the
00:05:00
second without giving a value for the
00:05:02
other eight the depreciation which will be retained for the
00:05:04
oysters the 80 will be 4% for the
00:05:08
other methods available in the
00:05:09
temporal trap the depreciation is
00:05:11
determined by the method of rennes and
00:05:12
therefore the damping of radiating allows you
00:05:15
to define the damping matrix
00:05:16
as a linear combination of the
00:05:17
mass stiffness matrices the
00:05:20
dialog box presented on the right allows you to
00:05:22
either directly enter the
00:05:24
values ​​of alpha and beta care to
00:05:25
calculate these two parameters from
00:05:27
the pulsation and
00:05:28
damping values ​​of two modes that
00:05:29
will have to be chosen therefore the recommendations
00:05:31
as to the choice of modes in order to obtain
00:05:33
the pulsations have been indicated on
00:05:37
our forum and the link to this game of
00:05:40
the outcome of discussions is indicated here
00:05:43
at the bottom right
00:05:48
or it is possible to define
00:05:50
linear viscous dampers either
00:05:53
the properties of the supports of the
00:05:54
releases or the games compatible
00:05:56
these definitions of damping we
00:05:58
follow to support that for the
00:06:00
last two methods of temporal analysis
00:06:01
framed in red here at the bottom right the
00:06:04
shock absorbers say that non-linear
00:06:05
are not available in the
00:06:07
current version the robot so concerning the
00:06:12
tend analysis parameters
00:06:14
we therefore find the recording step
00:06:15
which allows us to define the
00:06:17
time interval following which we wish
00:06:18
record the results of the analysis
00:06:20
this must be short enough
00:06:22
to be able to somehow capture the
00:06:23
rapid changes in the
00:06:25
excitation function and so in the
00:06:30
defined excitation function and this with
00:06:32
sufficient precision
00:06:34
the division parameter defines the
00:06:36
frequency of saving its data
00:06:38
within a given time step therefore
00:06:40
this parameter is not important when
00:06:42
using the
00:06:43
modal decomposition method since in fact in
00:06:45
this case the division parameter is
00:06:47
automatically calculated for each
00:06:49
vibration mode as a function of the
00:06:51
iodine schedule then it
00:06:56
and ends with a so-called forcing function
00:06:58
in a single whose only
00:07:00
parameter and the time this function
00:07:03
is then assigned a static case that
00:07:05
therefore the i stand to the structure which is
00:07:07
already applied the structure and which allows
00:07:08
this static case to vary over
00:07:10
time simply by increasing or
00:07:12
ignoring it with a
00:07:13
multiplier coefficient is the type of loads
00:07:15
while this static case contains does
00:07:17
not matter
00:07:18
it can be point forces of the
00:07:19
surfaces it is linear it doesn't matter
00:07:21
but it can also be displacements
00:07:22
or speeds imposed on the supports you
00:07:25
can also use virtual shopping carts
00:07:27
so it is those which are
00:07:28
framed in blue on the screenshot
00:07:31
which are named in direction x y and z
00:07:34
and which make it possible to simulate an earthquake
00:07:36
using temporal analysis in this
00:07:38
case in fact we are going to define the acceleration
00:07:40
varying in time, that is to say that
00:07:42
we are going to build an accelero g here the
00:07:44
accelerations which are entered are
00:07:46
always expressed in meter second squared
00:07:47
whatever the unit defined in the
00:07:49
matting preferences so as we
00:07:55
can see here the function is created
00:07:58
from a succession of points
00:08:00
defined from a value of time
00:08:01
on the abscissa and an
00:08:03
acceleration coefficient value on the ordinate
00:08:05
it can be defined in three
00:08:07
different ways either by entering a the
00:08:09
points in the chanter and f of tea are
00:08:12
by clicking on add an expression
00:08:13
finally before entering manually
00:08:14
l function expression to consider or
00:08:17
by opening a file in
00:08:18
tax format which would contain all the
00:08:19
points defining the function by
00:08:21
clicking on the open button which we can
00:08:23
see under the goethe expression button
00:08:25
here then
00:08:30
we are interested in some examples that
00:08:31
we have grouped together which seemed
00:08:33
interesting to us in order to deal with the
00:08:36
remaining points therefore in the first example the
00:08:38
aim is to model effects linked to
00:08:40
the presence of a crowd on a part
00:08:41
of structures or on a piece of
00:08:43
equipment as we saw it during the
00:08:46
previous webinar football analysis
00:08:48
makes it possible to mobilize
00:08:49
particular situations generally involving
00:08:51
a single person in walking activity
00:08:53
to model the effect of a crowd
00:08:55
whatever their activity it
00:08:56
could be seal walking
00:08:59
a race and it is loose snow
00:09:02
will no longer be suitable and it will then be necessary to
00:09:03
use the temporal analysis so as a triple
00:09:06
example here we will
00:09:08
use the recommendations of the
00:09:09
sci regulation and 354 which is a
00:09:12
regulation in English and which provides an
00:09:14
equation and the necessary data to
00:09:16
create a
00:09:17
time function representing the effect of a
00:09:19
soup of a crowd
00:09:21
jumping so here the function is
00:09:23
similar to that used during
00:09:25
the analysis all crazy they of it
00:09:26
do in fact by the number
00:09:27
of harmonics consider which is
00:09:28
generally four for
00:09:30
football analysis and here it is 2.6 it
00:09:32
also differs by the weight of the
00:09:34
crowd in quotation marks which is used
00:09:36
here compared to that of a single person
00:09:39
who is used during during
00:09:40
the analysis footfall them then in
00:09:47
in this example we will simulate an
00:09:48
activity of type its normal intensity
00:09:51
for the frequency will be 1.5 m on a
00:09:53
balcony I will define the function by
00:09:56
introducing the expression which we see here
00:09:58
in the middle of the positive years and
00:10:00
which was established from the
00:10:02
formulation provided by the regulation
00:10:03
which we see in therefore as much the
00:10:06
taste of the slide is therefore here the
00:10:12
time the compost presents the variable
00:10:15
time and the other parameters are
00:10:16
taken from the table that we see at the bottom
00:10:18
right for sow intensity and
00:10:22
normal density so the function that we obtain
00:10:26
thus is this one that in the
00:10:28
middle and depending on the type of this top
00:10:31
that we model the amplitude of the peaks
00:10:32
or the lengths of the
00:10:34
horizontal segments which vary little simply
00:10:36
depending on the type of sub here so we will
00:10:39
see that in robots so the model is
00:10:43
this one so we simply see balcony
00:10:46
modeled in bar and in finite elements
00:10:49
here the dynamic load which will vary over
00:10:51
time is this the
00:10:53
corpse load which is a classic surface load
00:10:55
so the idea will be to
00:10:58
vary over time this therefore this this
00:11:00
surface load so to do that we
00:11:02
will create we will have to create a
00:11:03
time analysis for it we see here that
00:11:04
the model analysis is already created so I
00:11:07
just have to click on new and I
00:11:09
will create my time analysis so
00:11:14
in this case play and elect July
00:11:15
use the method of
00:11:17
modal compositions and I will enter a
00:11:19
depreciation of 1% for the first
00:11:22
model so I remind you that here if I enter
00:11:27
1% for the first mode and that I
00:11:29
define nothing else for the other
00:11:30
modes all the athletes are depreciated 1%
00:11:32
also
00:11:34
in this which concerns the
00:11:36
time parameters I will therefore use impact in 2
00:11:40
00 a second the division does not matter
00:11:43
since I use the method of
00:11:45
modal compositions and I will
00:11:46
end the recording of the simulation
00:11:49
after fifteen seconds
00:11:51
I will now be able to create my
00:11:52
function so I'm going to click on
00:11:54
functions and so I wanted to give a
00:11:56
name so will put normal intensity and I
00:12:04
click on added now that
00:12:06
unlocks the two
00:12:07
additional English for me and so I'm going to go to
00:12:09
the point tab so that I can
00:12:11
fill in my function
00:12:13
so as I said earlier I have
00:12:14
three possibilities to do it either
00:12:16
entered but point by point with
00:12:20
for each tea its fdt value or by
00:12:24
clicking on open assuming that
00:12:25
I have my function in a text file
00:12:26
this is not the case here I'm going to create my
00:12:29
function by clicking on add an
00:12:31
expression is so the expression that
00:12:33
I used is the one that was
00:12:35
available on my on my slides so I
00:12:38
'm going to simply copy and paste it
00:12:40
from main from my presentation so
00:12:45
the copy pastes here in the
00:12:46
expression field the initial time is zero
00:12:49
seconds I start recording at 0
00:12:51
seconds the final time is the same
00:12:52
as previously i.e. fifteen
00:12:53
seconds and I I have a patent for it which
00:12:57
is 0 0 the unit in glee this will
00:13:02
therefore be the radios for this case and therefore I
00:13:06
validate at the time of validation we will see
00:13:08
here that robot will
00:13:09
automatically construct the function once
00:13:17
action is constructed I can close
00:13:19
this dialog box there and I
00:13:21
now just need to assign this
00:13:22
function which I see appearing here in
00:13:24
the list of function flyouts if
00:13:25
I had created several functions you
00:13:27
can select other functions
00:13:28
here I have some than one and I'm going to assign it
00:13:30
to the 14 dynamic jaw quay and I
00:13:33
simply click on added and
00:13:35
my number two load cases as well
00:13:37
as the associated function must be
00:13:38
available in this table here
00:13:39
once I have done that I can
00:13:41
click on ok and I can launch the
00:13:43
calculations so we will see that for this
00:13:49
type of analysis the calculation times
00:13:51
are relatively long so here I will
00:13:53
do it for this first file for the
00:13:54
second file also because the
00:13:55
second file this calculation quickly and
00:13:57
for the other files I will
00:13:58
directly open the files with
00:14:00
results to avoid losing so much on
00:14:02
the calculation phases so
00:14:12
note for example in this case
00:14:14
it is stupid to 1501 recording points
00:14:17
these 1500 one point which correspond in
00:14:19
fact to my parameters of tangier defined
00:14:23
here that is to say that a second
00:14:24
of recording every
00:14:25
hundredth of a second makes 1500 points
00:14:27
plus the point is equal to zero creates the
00:14:29
five senses therefore the idea to the outcome of
00:14:36
this example will therefore be to
00:14:38
demonstrate the different types of
00:14:40
results that we will be able to exploit
00:14:43
so we will see that we have results
00:14:45
specific to the temporal analysis which
00:14:48
are tables specific to the
00:14:49
temporal anise and specific diagrams
00:14:50
for this analysis and we will also see
00:14:52
that we can exploit the
00:14:54
classic results such as you
00:14:56
are used to doing it either via
00:14:58
the tables or graphically so so-
00:14:59
called classic results it is a
00:15:01
force reaction of this kind of things
00:15:20
so we are soon at the end
00:15:50
so once
00:15:53
the calculations are completed what we will be able to
00:15:55
see on this case of temporal analysis
00:15:57
is that in fact this case of an instant
00:15:59
for her it is a composite shopping cart going a little
00:16:01
like other cases you are
00:16:02
perhaps used to using, that is to
00:16:04
say the 4 weightings but it is
00:16:06
accidental or the cases of the rolling eca
00:16:09
which are also cases of composing it is to
00:16:11
say that they are grouped in
00:16:12
grouped in a single load case
00:16:14
but which are composed of a certain
00:16:16
number of components here for the
00:16:17
moncade temporal annex given the
00:16:19
parameters 1501 components
00:16:21
so I will be able to select the
00:16:23
components one by one by clicking on the
00:16:25
button selected component of the cac
00:16:27
so we see that here robot has
00:16:29
selected a component for me in the middle of
00:16:31
the time range that I have defined so
00:16:34
it has composed me it has selected this
00:16:36
component for me at 750 if I display in
00:16:38
parallel for example no as I
00:16:39
said we can display
00:16:40
completely classic results like efforts
00:16:43
of the reactions here if I display the
00:16:45
deformed for example it is that I say to myself
00:16:50
in time we will see what we can
00:16:53
see here that the
00:16:54
graphic representations of the loads but also of the
00:16:56
values ​​and the graphic representation
00:16:58
of the results change as
00:17:01
I change two
00:17:03
time components so once again we will be
00:17:07
able to exploit
00:17:08
completely classic results such as for
00:17:10
example reactions in the form of
00:17:12
table the problem here
00:17:15
perhaps that given that it is a
00:17:17
compound case so here we have 1500
00:17:19
components of time nowhere or
00:17:21
support it will quickly become quite difficult to
00:17:25
read for the results presented
00:17:29
in the form of tables of the same
00:17:31
way if I if I exploit the
00:17:38
results also in the form of
00:17:40
tables which are proposed for
00:17:41
the time analysis for it we will
00:17:42
find results so here we see
00:17:44
the speeds which are provided for the
00:17:46
nodes and for each node and therefore for
00:17:49
each component of time and we will
00:17:51
also find in a right click
00:17:52
columns in the table the components
00:17:54
of acceleration but once again we
00:17:56
see here that is given composed in
00:17:58
two times by component of time one
00:17:59
part us so the very quickly it goes
00:18:01
become quite difficult to read and therefore this is why
00:18:04
generally the
00:18:06
underwater results for this type of analysis are
00:18:08
used using the
00:18:10
diagrams that we will find in
00:18:11
advanced results and temporal analysis
00:18:15
diagram so we see by default when
00:18:18
you play this path of dialogue the
00:18:19
software in fact suggests to me so we have
00:18:21
two donkeys in fact we in the diagram zone
00:18:22
available and the diagram zone displayed
00:18:24
in the diagram zone available
00:18:26
automatically the software therefore detects
00:18:28
that it is a temporal analysis it
00:18:29
offers me to display the diagram of the
00:18:32
function I defined for lack a good
00:18:33
dynamic guy so here I will I will
00:18:36
joust and therefore from the area from left to
00:18:38
right by clicking on this button there
00:18:40
so as to be able to display it
00:18:41
I can also display other
00:18:43
types of diagrams by clicking on the
00:18:44
add here button so a whole bunch of
00:18:47
results dedicated or not of the displacements
00:18:49
of the speeds and the accelerations for
00:18:51
the different components of the
00:18:53
reactions of the efforts in the bars and
00:18:56
also of the results of type and
00:18:58
not finished surface in the case where
00:19:00
I had where I will have
00:19:02
plates for example so here if I
00:19:06
apply the software must
00:19:08
display the diagram is here it is the
00:19:10
function to the fact that I applied my
00:19:11
dynamic case I will be able to display
00:19:13
in parallel for example a movement
00:19:17
of a node is what I can try to
00:19:19
determine firstly it is
00:19:22
where my maximum deformation is located a priori
00:19:25
so I will look at that
00:19:27
if I normalize it here we see that it
00:19:31
has deformed maxi is roughly in
00:19:33
this year has so around a 16 so
00:19:37
if I come back here in my diagram I
00:19:38
can click on add what I
00:19:41
want to look at its movements in
00:19:43
the direction usa aid or no 16 and I
00:19:47
can choose also a color
00:19:48
so for the moment the verb how much I
00:19:50
click on added I just need to add
00:19:53
this diagram of the left or
00:19:55
right zone and I do what I do is
00:19:56
applied and so there I have
00:19:59
the display superimposed of my
00:20:02
dynamic function and the function is the
00:20:06
result of the displacement of a 16 I am going to
00:20:08
add here
00:20:09
the acceleration of this node in z so
00:20:13
I changed color so that it is
00:20:14
and readable with the displacements and I
00:20:17
add and when we see the reference
00:20:23
thing already the first thing we see
00:20:24
is that at the start of the analysis we
00:20:27
notice accelerations having
00:20:29
very large amplitudes
00:20:31
also having a very high frequency of appearance
00:20:34
the problem therefore my diagrams and
00:20:36
mirel scale in relation to the
00:20:39
maximum acceleration values ​​and therefore I no
00:20:42
longer see what is happening behind that is to
00:20:43
say my displacement values ​​so
00:20:46
to be able to display correctly without
00:20:48
worrying about the scale in fact on
00:20:51
the same diagram my different
00:20:53
results you just have to
00:20:54
right click here and uncheck adjusted
00:20:56
the scale to the maximum value and there I
00:20:58
will have the three values ​​at the same
00:20:59
time while maintaining the following problem
00:21:00
is that given that I am displaying
00:21:03
data having different scales
00:21:06
I will be able to read only
00:21:09
data on sweat so on the
00:21:13
ordinate axis at the same time so here we see
00:21:15
that on the ordinate axis
00:21:16
what I am looking at is its
00:21:18
normal intensity so in fact it is the coefficient
00:21:19
relating to the function of my shape
00:21:22
depending on the situations
00:21:23
if I wish to look at my movements
00:21:25
in fact I just have to click here to
00:21:27
select placements and here we
00:21:28
see that I now look at my
00:21:29
movements in mm and if I click
00:21:33
on the last line
00:21:35
I look now but my
00:21:37
accelerations in its accelerations a
00:21:39
little strange at the beginning actually occur
00:21:41
because in the temporal analysis
00:21:42
under robot one of the basic hypotheses
00:21:45
is that at the moment of application of the
00:21:48
dynamic load the structure is
00:21:49
assumed not loaded and therefore the
00:21:54
dynamic load is lower taf and to apply
00:21:55
suddenly to the structure
00:21:57
which generates it is we will say these
00:21:59
disturbances in dynamic quotes
00:22:01
at the beginning of analyzed which tend to
00:22:02
attenuate on the rest of
00:22:04
analyze it if we want for example to
00:22:06
present results over another
00:22:08
time range to avoid for example
00:22:11
in this case having to view this
00:22:13
type of results which are so
00:22:14
interesting
00:22:15
just right click on the
00:22:17
property diagram diagram and I will
00:22:20
uncheck automatic interval one
00:22:23
after having done that in fact I have this
00:22:24
vertical bar which is displayed on the
00:22:27
diagram and which will allow me to
00:22:28
click two points in the
00:22:30
time range I wish to look if for
00:22:31
example I want to have a time range
00:22:32
from four seconds to 6 seconds
00:22:34
I click a first point at 4 seconds
00:22:36
our point 6 seconds and my diagrams
00:22:37
and updated on this time range
00:22:42
so that was for the first example
00:22:46
we will now look at another
00:22:49
example which allows us to illustrate how
00:22:50
we can deal with the dynamic effects
00:22:52
linked to the operation of machines
00:22:53
driving rotating elements
00:22:55
such as
00:22:56
fan turbines so here we will describe two
00:22:59
modes of operation in fact we will see
00:23:00
that there are two files there is a first
00:23:01
file which will be used to
00:23:04
demonstrate how we will create this type of
00:23:06
system is a second file in
00:23:07
which we will show the
00:23:09
operating mode for the machine the
00:23:11
so-called normal operating mode and a
00:23:13
transient phase mode
00:23:14
that is to say during the
00:23:15
start and stop phases of the machine years
00:23:17
to represent this machine we will
00:23:19
create Florence perpendicular
00:23:20
to each other which will vary
00:23:22
sinusoidal mans with a
00:23:24
phase shift 2 4 to 2 90 degrees between the two
00:23:27
so to do that so I'm going to close
00:23:29
this file there and so my file is going
00:23:40
to be this one where the first case so
00:23:43
in which I'm going to describe how we
00:23:44
create this this type of analyzed this load case
00:23:48
so the geometry has nothing
00:23:51
particular it is simply a
00:23:53
simple gantry in 3d and so as I said we
00:23:57
will have to create two types a
00:23:58
horizontal force a vertical force which will
00:24:00
vary signaled sinusoidal solid relay
00:24:01
mans so for that I create
00:24:03
a first load which will be called
00:24:06
fixed a second
00:24:10
called at z and games
00:24:16
load I will very here a nodal force
00:24:19
of intensity whatever 01 here and I
00:24:23
applied it for example to this null of 47
00:24:27
so we see here the force and fixed in
00:24:30
the in the in the k5 and I do the
00:24:33
same thing here in z in the cassis
00:24:35
always at the same ne so here
00:24:37
the intensity in x and 2 0 and 0.10 the same
00:24:40
in z is always better 47 so I have
00:24:45
good only at five years but fixed and blackcurrant
00:24:47
highlighted so now I in the
00:24:50
calculation options I will be able to
00:24:51
first create a
00:24:52
modal analysis to be able to release my
00:24:54
time analysis for it the model analysis here I
00:24:56
will leave it with the parameters by
00:24:57
default and I am going to create an analysis so
00:25:00
temporal I am going to use once
00:25:02
again the analysis the method of
00:25:04
modal compositions and I am damping all
00:25:06
the modes at 5% so here I am going to
00:25:16
use
00:25:20
a recording step every 0
00:25:23
05 second division doesn't matter since
00:25:26
we are on the method of
00:25:28
modal compositions and an end of analysis after
00:25:29
two zones
00:25:31
I will now be able to create
00:25:34
my functions because in reality I
00:25:36
will have two to be able to create the
00:25:37
phase shift of which I click on the
00:25:41
function definition button I create
00:25:42
a first function which is going to be a
00:25:43
function similar to idols I am going to
00:25:46
london the points and my function so
00:25:48
I am going to chalk it by clicking on add
00:25:49
expression and therefore my function will be
00:25:52
winding 360 by 10 which will be my
00:25:55
frequency therefore leaves the
00:25:58
time parameter in the same way so the
00:26:01
initial time will be 0 seconds the final time
00:26:03
of second and the time step will be 0
00:26:09
01 second is here I would however have
00:26:11
degrees so here is the sinusoidal function
00:26:15
I return to ong the functions and I
00:26:16
will create another one which will be called
00:26:18
causse and it will be the same function but
00:26:23
but we caussinus so add
00:26:26
expression we cause 360 ​​computers which the
00:26:32
frequency and leave
00:26:35
two seconds finally in final
00:26:37
a final time the passed a thousand islands and
00:26:42
bellowed for the English unit so I have
00:26:47
good but two functions I can
00:26:48
select visualize them quickly
00:26:49
here in the water so I can close this
00:26:52
dialog box there and I will assign
00:26:54
to my case and fix the sine function and in
00:26:59
my case and z
00:27:01
the caussinus function so here I will
00:27:07
launch the calculations you will see that
00:27:08
on this model there it is to re the
00:27:11
calculation times are are reasonable
00:27:16
and therefore after calculation if I display the the
00:27:21
graphic representation of my loads
00:27:23
on the temporal cac and I select
00:27:25
the components of may component of the cac
00:27:28
if I move in time in fact
00:27:30
what we see is that we have created here
00:27:33
a system in rotation around which
00:27:36
d 'a 47 is in fact the result of
00:27:38
these two forces which rotates around
00:27:41
those of 47 and which will allow us to
00:27:43
create and therefore seek to
00:27:46
find the dynamic effect of this
00:27:49
system in rotation
00:27:52
therefore in the same way as
00:27:54
later we will be able to look at the
00:27:55
results in the form of diagrams so
00:27:57
advanced results and temporal analysis
00:28:00
diagram so I will be able to look
00:28:02
at first but two
00:28:04
functions which are therefore
00:28:07
sine and caussinus functions and in parallel I
00:28:10
can for example display moving
00:28:14
a 47 in therefore 47 years z for example
00:28:22
and in os x good I changed color
00:28:26
for it to be clearer and if I
00:28:33
pass but diagrams of the
00:28:34
area available at the address of a file
00:28:36
by clicking on apply so I
00:28:38
return to the same problem as
00:28:39
earlier, that is to say that my diagram
00:28:40
which scaled in relation to the
00:28:42
maximum values ​​so here I have to
00:28:44
right click on the diagram and I
00:28:46
uncheck adjust the chairs at the
00:28:48
maximum value and we alice is a
00:28:50
graphical representation of the
00:28:51
displacements as a function of time of a
00:28:53
47 of wave a wave application due to me
00:28:55
of one on which the motor is supposed to be
00:28:58
attached I can remove the
00:28:59
functions here so that it's
00:29:02
clearer I'm going to remove everything and we have a
00:29:08
presentation so in red had the
00:29:11
variation of the movement in
00:29:19
the
00:29:22
file directly with the results
00:29:24
because the calculation times are
00:29:25
much longer so the structure the
00:29:32
voice
00:29:33
does is we are going to affect the principle
00:29:35
remains the same that is to say that we have created
00:29:37
two sets of forces in y and z a tooth
00:29:41
for immigrants who six elected officials from Nantes here
00:29:43
who will vary the same if
00:29:45
also harm with a phase shift of
00:29:46
90 degrees we do this by a
00:29:49
temporal analysis here the idea would be to
00:29:52
simply have the efforts and the
00:29:56
reactions on this system which serves as a
00:29:57
support for a turbine for example
00:30:00
so the temporal analysis here was
00:30:03
created in this way what is
00:30:06
especially interesting here is the
00:30:07
definition of function and we see here
00:30:11
that we will see it more clearly when we
00:30:13
look at the diagrams but our
00:30:15
function was actually defined in
00:30:17
three steps in fact that is to say that
00:30:19
I cannot create this function
00:30:20
simply by adding a single
00:30:22
expression so finally in reality there is
00:30:24
a first expression of tea equal to
00:30:25
zero was equal to 4 that's a
00:30:27
first expression
00:30:28
so to do that we had to click
00:30:30
on add expression fill in
00:30:31
the expression here say that the
00:30:33
initial time is zero like we did
00:30:34
earlier and in the final c 4 so this
00:30:38
creates for me this first part of the signal
00:30:40
here it is the normal operating phase
00:30:41
of the motor and therefore this is where
00:30:43
it is important to create the fauna of the
00:30:45
function by indicating here that the
00:30:49
initial time start of the expression we
00:30:52
will say corresponds to the final time of the
00:30:54
first expression and in the same
00:30:56
way the part the transition phase
00:31:00
where we will stop the machine and was
00:31:03
created by a third expression or the
00:31:06
same we indicated that the initial time
00:31:07
corresponding final of the second
00:31:09
infection
00:31:10
so it is clearer sent years to in the
00:31:13
form of diagrams so here they
00:31:18
are where we see I want us to draw
00:31:26
we see
00:31:28
the three phases starting phase of the
00:31:30
engine normal operation and
00:31:32
stopping phase and what is interesting here
00:31:33
is that if we look at the
00:31:36
displacement of one of number 10 in fact which
00:31:39
is the application node where
00:31:41
the motor is supposed to be maintained if we look
00:31:44
at the same time at the displacement at z of this
00:31:46
motor the device
00:31:48
I remove the adjustment and thematic we
00:31:50
realize in fact that the
00:31:51
maximum displacement of this is obtained in the
00:31:53
transition phases therefore
00:31:55
motor starting phase of a
00:31:56
much more reasonable displacement in
00:31:59
normal operating mode and a displacement
00:32:01
which rocchi which is similar to that
00:32:03
obtained at the time of starting of
00:32:06
engines in stopping phase then the year
00:32:18
also be used to target
00:32:20
accidental situations such as
00:32:22
the impact of an object I am both on a
00:32:23
floor or the sudden breakage
00:32:25
of a cable ensuring the stability of a
00:32:27
baobab and we have prepared these two examples
00:32:29
so the first concerns the
00:32:32
fall of an object on a floor
00:32:34
so once again there to avoid
00:32:36
calculation times I want to open the
00:32:40
file with the results and in fact
00:32:46
to do that the object falling on
00:32:49
the floor is simply a
00:32:50
point force applied only at a
00:32:52
given location on the floor and we
00:32:54
will create a temporal analysis in reality
00:32:57
in this model and this is what makes
00:32:58
the model interesting is that we have created
00:33:01
three year analysts for it in
00:33:02
which we will vary both the
00:33:04
impact power of this object and the
00:33:07
time of a pact that is to say that if I
00:33:09
look at the first temporal analysis which
00:33:10
will serve as a reference
00:33:12
we have a certain value of
00:33:14
amplification coefficient of this impact which
00:33:15
corresponds to a certain power
00:33:16
of impact
00:33:17
so we have a coefficient which is around
00:33:18
65 on a time 2 0 0 one second if
00:33:23
I look at my second time analysis
00:33:24
for her we have a power of impact
00:33:26
which is double but on a time
00:33:28
twice as short and the third
00:33:31
time analysis so we have a powerful impact
00:33:33
divided by two compared to the
00:33:35
reference but which lasts twice as
00:33:38
long and if I look at the results
00:33:45
first the functions here it is
00:33:48
clearer here it is the reference
00:33:49
the middle rectangle we realize
00:33:51
that in fact the air under these rectangles
00:33:53
are identical in fact and it is the era
00:33:57
of greenhouse etc. therefore the integral of
00:33:59
its functions corresponds in fact to the
00:34:01
quantity of movements of the object in
00:34:03
free fall and this is what explains why the
00:34:07
displacements under this in this model there
00:34:09
for the three temporal analysts
00:34:10
are strictly identical since the
00:34:12
responses in the integral of its three
00:34:14
functions being identical the
00:34:16
results for this model for the three
00:34:19
temporal analysts remain identical so
00:34:20
we can clearly see that the curves are
00:34:21
perfectly superimposed that is to say that
00:34:23
if I moon them I remove them one by
00:34:25
one we will see the following two displayed
00:34:28
in this case it is the last one here so
00:34:35
the second situation
00:34:36
if lace therefore it is the one which is
00:34:38
represented by this capture screen here
00:34:41
so it's the sudden breakage of a
00:34:43
cable so we have prepared in fact there are
00:34:46
two files to show for this
00:34:48
model so the first file is
00:34:51
the file which contains all the
00:34:53
cables so it this one is not calculated
00:34:55
and I am not going to calculate it and to
00:34:56
avoid calculation times in Paris but
00:34:57
the idea is therefore we have a model in
00:34:59
which we have calculated the forces in the
00:35:03
cables this model contains all the
00:35:06
cables of the mahou banner and the idea will be
00:35:09
in this model to determine what is
00:35:11
the maximum tensile force in the
00:35:13
cable which is supposed to break for the
00:35:18
load case which is supposed to give rupture
00:35:21
once we have obtained this
00:35:23
information there we will be able to remove
00:35:24
the cable is therefore that we froze
00:35:28
in a second model it is this one
00:35:37
and therefore it
00:35:39
abl there and replaced in fact by a force
00:35:42
which corresponds to the attraction of the cable
00:35:45
before the rupture is this force there
00:35:50
were introduced into the framework
00:35:52
so as to render what this situation
00:35:54
as being and the initial situation
00:35:56
before before the break of the cable
00:35:59
that is to say that if I go to see the
00:36:00
parameters of the amended the resistors
00:36:01
for it here we have indicated that the
00:36:05
initial situation is the situation
00:36:07
given by the k1 that is to say cables
00:36:11
stretched and the cable is present and what we
00:36:14
also did is that we
00:36:16
created a so-called compensatory load which
00:36:19
will be canceled entirely the load of
00:36:22
the halal tensile force present in
00:36:25
this cable and this is what will happen
00:36:27
when the cable will pass tests therefore
00:36:31
this compensatory load which will
00:36:34
vary in quotes over time
00:36:35
since in reality it will not vary we
00:36:37
will affect them a constant function 1
00:36:42
and therefore the k1 is an initial sold we will
00:36:45
have a dynamic effect which will be
00:36:48
brought to this model and we will be able to
00:36:50
analyze that in the diagrams if I
00:36:53
look for example at the displacement of
00:36:55
1725 donkey and the neilly at the
00:36:58
original attachment point of the cable we will be
00:37:01
able to view the dynamic effect
00:37:04
held since the break of this cable in
00:37:07
the model and we see that the displacement
00:37:09
of this node tends to attenuate
00:37:12
as the time to analyze that
00:37:17
you of the moment therefore the displacement
00:37:20
will be zero what we can also look at
00:37:23
is for example the results of the
00:37:26
efforts in cables
00:37:29
of the tensile forces in certain
00:37:31
cables so as for example I noted
00:37:34
the values you will see what
00:37:35
the cables are before so the 1603 here and the
00:37:44
1607 from added memory so if we
00:37:49
select the two to show
00:37:50
what these cables are but 603 and 1607
00:37:54
so we have the cable 1603 which is the cable
00:37:57
below and the messiah 107 which comes
00:38:00
from neighboring mutts in a direction
00:38:04
not opposite but at 90 degrees relative to
00:38:07
the cables which broke and if I display
00:38:10
the results of traction forces
00:38:15
in these elements there we clearly see
00:38:17
that when the effort in one of the cables
00:38:20
increases the risk respond and its
00:38:23
dressings the effort in the cable in
00:38:28
time the other cap 10 minutes
00:38:31
began in this way that we can
00:38:33
represent let them be accidental from the rupture
00:38:35
of a cable in a model then another
00:38:43
temporal analysis is the modeling
00:38:44
of the dynamic effect of the passage of a
00:38:46
vehicle on a structure as we can
00:38:47
see there on the screenshot which
00:38:49
comes from therefore screenshots which comes
00:38:51
from the model that I'm going to show you
00:38:52
here so the same I'm going to open the
00:38:57
file with the results so the
00:39:04
structure
00:39:05
if it's a relatively
00:39:06
simple structure on which it doesn't go so
00:39:09
here it's a train and so we modeled it
00:39:14
by different cases of loads all
00:39:16
possible positions during the passage
00:39:17
of this train
00:39:18
so if I select my four
00:39:19
loads so we see here apart from being the
00:39:21
locomotive at the beginning followed by the wagons
00:39:24
and the locomotive will end up
00:39:26
disappearing at the other end of the
00:39:28
structure and so on
00:39:30
and to generate therefore to be able to
00:39:32
determine the dynamic effect of the passage
00:39:34
of this train on this structure
00:39:37
so we created an analysis once again
00:39:39
so temporal the particularity the
00:39:41
particularity sorry here is that we are going
00:39:44
to need create as many
00:39:46
functions as there are two
00:39:48
different positions of this train so
00:39:51
you see there are 100 positions here so
00:39:53
we see them pushed back as militias in
00:39:55
possible position for the passage of the
00:39:59
train and therefore there are 100
00:40:01
different functions which have been created here in
00:40:03
the temporary analysis I'm not going
00:40:04
to show them to you here the functions we do
00:40:06
n't really see what's happening I wanted to
00:40:08
show for the diagrams so
00:40:12
leaving the function here they are
00:40:15
here's what the
00:40:16
angles are and to be able to see a little
00:40:18
more clearly what's happening happens we are
00:40:19
just going to look at a given interval so
00:40:26
the functions that they have been defined
00:40:27
are madiran functions of anti that is
00:40:31
to say that the idea why we created these
00:40:33
functions in this way there suppose
00:40:36
that here on my position
00:40:38
the position n of the passage of the train when
00:40:42
the position n -1 and maximum the position
00:40:46
it has not yet started in
00:40:47
quotes, that is to say that it is
00:40:48
zero the position n will appear on the
00:40:51
structure of will increase linearly
00:40:53
until to obtain a maximum in the middle
00:40:57
so at this position there we taste the
00:41:01
time function and at the same time the
00:41:04
position and -1 will decrease until
00:41:06
obtaining until it becomes zero at the moment when
00:41:09
the position is minus 1 becomes zero the
00:41:11
position in addition we begin to
00:41:13
appear and the advantage of doing
00:41:15
this function in this way makes it
00:41:17
possible to ensure that we have in fact a
00:41:19
loading which is constant over the entire
00:41:21
duration of the analysis, that is to say that if
00:41:23
I select my temporal analysis here
00:41:27
and I run the components
00:41:33
of my synthesis analysis
00:41:35
to have no variation in
00:41:38
the load order during the passage of the
00:41:40
train and to have all the
00:41:43
positions represented at the different
00:41:45
times where the difference in the moments of the
00:41:49
bit of the passage on the structures and
00:41:53
here so once again we will be able to
00:41:55
exploit in the same way as the
00:41:58
presented previously a whole small whole
00:42:00
bunch of specific results hassan
00:42:03
al awsat analyzed for example here we will be
00:42:04
able to look in what way varies
00:42:07
the reaction on a little taken at random
00:42:11
that we can which is for example 102 show you
00:42:14
where it is as a function of
00:42:17
time and therefore those of 102 it's the
00:42:22
first point it's the second post here and therefore we
00:42:25
see the variation of the island that it has
00:42:29
an influence from the east beyond taking into
00:42:31
account these dynamic effects on
00:42:32
the reactions of on this second post
00:42:40
then illegal
00:42:43
the effectiveness of a love of a shock absorber
00:42:45
harmonic in a system so using
00:42:47
the analysis of the temporal analysis so
00:42:50
to do that so once again so
00:42:54
we have prepared files we actually have
00:42:56
two files the first file it will
00:42:58
be a first model in which we
00:43:04
so it already contains the results and
00:43:07
in which we have not we have not created this
00:43:09
damper simply create the
00:43:11
temporal analysis in reality we have created several
00:43:13
analysts in for it the function
00:43:16
the charge has excited it is this one which
00:43:19
is assigned to the middle of the bar and we
00:43:21
created different time analyzes for
00:43:23
them all composed practically in
00:43:24
the same way on Thursday practically
00:43:26
because in fact what varies is the
00:43:27
function is in reality the frequency of
00:43:30
the toss of its functions so here have
00:43:32
a frequency of 2 certainly the second
00:43:34
analysis time for it and at 2.75 and
00:43:36
so on we created a certain
00:43:38
number so there are five or six analysts
00:43:41
years for it to integrate once
00:43:44
so the calculation is finished we can look
00:43:47
in the diagrams we can
00:43:53
place the variation of the displacement
00:43:55
over time of this of this no 12 to which
00:43:57
we apply the load for all
00:44:01
the temporal cases is what we will
00:44:05
seek to have here in a right click
00:44:09
columns this is the maximum value of the
00:44:10
displacement that we find here for
00:44:16
each temporal year therefore first temporal analysis
00:44:18
of maximum value went from 62 the
00:44:20
second it is 45 and so on
00:44:22
and in the second model therefore we
00:44:24
created it is therefore the analyzes remain
00:44:27
strictly identical, that is to say that
00:44:29
the only parameter which varies is the
00:44:30
frequency in the function and we have
00:44:35
also created a shock absorber and therefore the model
00:44:40
is this one. I will show you
00:44:43
how the shock absorber therefore
00:44:49
the shock absorber
00:44:50
created here by a not compatible with
00:44:54
elasticity criteria and a
00:44:56
damping criterion then these parameters
00:44:58
we determined based on
00:44:59
recommendations which are provided which
00:45:00
can be found in the literature for this
00:45:02
type of device which are the
00:45:04
harmonic dampers and the
00:45:06
compatible node has been affected as
00:45:09
proposed by the recommendations at the point
00:45:13
of applications of bass and loads
00:45:19
therefore the types of analysis once
00:45:21
again out of 100 are identical which
00:45:22
varies in the functions therefore it's
00:45:25
leaving the frequencies and we will be able to
00:45:27
look in the same way,
00:45:28
whatever it is, what is
00:45:30
the effectiveness ultimately of the presence
00:45:32
of those of this shock absorber in the
00:45:33
system so here the curves and if I
00:45:41
display it therefore in click right columns I want the
00:45:44
maximum values ​​a cycle in units we
00:45:47
see here that we then earlier we
00:45:49
were in mm the maximum values ​​happen to
00:45:52
be around 14 mm and so if I
00:45:54
return to my pressure the presentation
00:45:55
what this allows us to construct
00:45:57
this via excel in fact we can
00:45:59
export these results did not have rexel
00:46:01
simply by copying and pasting
00:46:03
the diagrams between children and so we
00:46:04
see here the red curve which is the
00:46:07
variation of the maximum displacement of the
00:46:09
system in in any case of no. 12 without
00:46:12
a shock absorber and here the blue curve which
00:46:14
ultimately represents the effectiveness of
00:46:18
this shock absorber since here we see
00:46:20
the displacements are indeed of a
00:46:23
mortar so finally one of the last
00:46:30
applications that we can think of
00:46:31
for this temporal analysis would know
00:46:34
to actually use temporal analysis
00:46:35
in order to simulate the effect of an
00:46:37
earthquake for structures whose
00:46:38
behavior is strongly nonlinear
00:46:39
and for which linearization done
00:46:41
using the spectral method is
00:46:43
incorrect in this context you can
00:46:46
either use the virtual maps that
00:46:48
I mentioned previously
00:46:49
which are the x y and z direction cases in order
00:46:51
to define the accelero g or you
00:46:55
can create static cases with
00:46:57
imposed displacements of support speed with
00:46:59
accelerations to pose support
00:47:00
assuming plq we know them in
00:47:02
this context and for which we
00:47:05
would return to applying the
00:47:06
time function for it as we have done
00:47:08
until now so I have a file to show you
00:47:13
quickly for this case the file
00:47:17
c It is this one which is just
00:47:22
a model supporting a structure and
00:47:25
this structure which is supporting has been
00:47:26
represented here by masses and therefore
00:47:30
it is senna this is where they will be
00:47:32
accelerated by temporal biz therefore
00:47:36
the temporal analysis was created in
00:47:37
this way, that is to say that we
00:47:38
used the virtual shopping carts y and z
00:47:41
that we see here and we see there in the
00:47:45
functions in fact the different accesses
00:47:47
to the gram by direction so here the access
00:47:48
to the fears in the direction xxl
00:47:50
looking at the direction there is the z here
00:47:53
the problem in quotes of these
00:47:55
accelero g there is that we cannot go and
00:47:58
build by one by a simple
00:48:00
expression as we have done until
00:48:01
now in the examples and the
00:48:03
entries point by point it's true
00:48:05
quite tedious so what can be
00:48:08
done here its two we actually click on
00:48:11
definition of the function
00:48:12
good I'm going to delete the test has
00:48:16
accelerated at the g there to be able to
00:48:17
add more 'others have accelerated so in
00:48:20
fact we will click on open a file
00:48:21
and the file the accelero g
00:48:25
you will find it normally
00:48:35
you will be able to find in fact you by
00:48:36
clicking on open a file you
00:48:38
will normally come back to it I have
00:48:42
changed speak of directory just
00:48:44
now so the access file the
00:48:49
programs is this one which
00:48:51
therefore corresponds to the earthquake
00:48:52
yes it is an earthquake example which which
00:48:56
provides with the intention of rgo which
00:48:58
therefore also corresponds to vérossaz of
00:49:01
magnitude 7 2 which appeared in
00:49:03
Romania in the 70s and which
00:49:06
destroyed certain cities after two by
00:49:08
almost 80%
00:49:09
and therefore if we open this file which
00:49:13
in text contains all the
00:49:14
access points Hérault g we in fact have the
00:49:16
three directions which are directly
00:49:17
created to accelerate g strait where
00:49:20
thirds we see that they are
00:49:21
directly created and which can be
00:49:23
used for your analysis time for
00:49:25
it and which will come is to accelerate
00:49:26
the masses which have been defined in this
00:49:28
model then how
00:49:36
could we see it during the presentation of the
00:49:38
different examples a case of Annie this
00:49:40
time for her it is in reality therefore a
00:49:41
case which composed similar a framework
00:49:43
which has rations 1.15 rolling including
00:49:45
a certain number of time steps it is
00:49:47
possible to convert each
00:49:48
case component into a simple case in order to
00:49:51
use it as a
00:49:53
combination for example so be
00:49:55
careful it is only a 1.6 and generate
00:49:57
from the time debates of a
00:49:59
temporal analysis are so-called virtual cases,
00:50:01
that is to say that the results they
00:50:02
contain are automatically
00:50:03
deleted if you launch the
00:50:05
model calculations again you will then have to
00:50:07
delete this empty case and therefore create them to
00:50:10
do that simply on the last
00:50:12
model that I presented to
00:50:14
you you select your temporal analysis
00:50:17
we click on selected component of the
00:50:19
cac we select the component that
00:50:23
we wish to convert and we click on
00:50:25
the button create that at the base of a
00:50:27
component and it will come and therefore creates
00:50:29
an inca static which contains the
00:50:32
results of this little of this not so much for
00:50:33
her and which could then be
00:50:35
used in an hour for the
00:50:39
combinations for the sizing the
00:50:41
reinforcement month so we
00:50:48
the session so do not hesitate to ask
00:50:50
your questions your questions via the
00:50:52
gotomeeting panel which is dedicated and
00:50:55
I will try to answer it during the
00:50:56
session
00:50:58
and then the rest of the questions for you
00:51:01
can also be spread on the forum
00:51:04
thank you guillaume main for 7.1 this
00:51:07
presentation
00:51:08
so do not hesitate to ask your
00:51:10
question for at the moment we just have a
00:51:12
question how to vary the rigidity over
00:51:14
time of an element of the structure
00:51:15
to simulate damage and therefore
00:51:18
as we have seen in all the examples
00:51:21
the temporal analysis varies a
00:51:23
loading where a acceleration of
00:51:26
mass etc. did not vary the rigidity
00:51:30
of an element over time so that is
00:51:32
not possible
00:51:45
so while waiting for the questions
00:51:47
to arrive why simply a reminder
00:51:49
therefore the possible questions the dreams
00:51:51
of the possible answers to the questions
00:51:53
that you are going to ask will be posted to you
00:51:56
on the feedback page of
00:51:59
our forum
00:52:01
so don't hesitate so we have put the
00:52:03
link on this page and so
00:52:06
don't hesitate to ask your questions we
00:52:08
will try to answer them
00:52:16
so a question so what are the
00:52:20
tips for choosing the
00:52:21
calculation method between newmark decomposition mode
00:52:25
finally umac decomposition on the outward journey the
00:52:27
last two methods no for me
00:52:31
the recommendations mainly relate to
00:52:34
the way in which you wish to amortize
00:52:35
the model in fact, that is to say that there if
00:52:38
you have to consider a depreciation
00:52:40
which would be constant throughout the
00:52:41
duration of the analyzes as I did on
00:52:44
the first two models the simplest
00:52:47
is to use the modal decomposition method since we have seen that it is
00:52:49
sufficient at this moment - there to enter the
00:52:51
damping for the first mode and
00:52:54
all the other modes will be damped
00:52:56
with the same damping value for
00:52:59
the other methods it is a little more
00:53:00
complicated since we use the
00:53:01
riley method and at that moment so I
00:53:05
recommend that you read what the post which
00:53:08
concerns this specific point as
00:53:11
to the choice of the pulsations to use for
00:53:15
the determination of the alpha
00:53:17
and beta coefficients which allow us to
00:53:19
determine the damping matrix and
00:53:21
you will see in fact that on this discussion thread
00:53:22
explains that
00:53:25
depending on the pulsations you will
00:53:26
choose the facts the facts of
00:53:31
the damping on the system can
00:53:32
vary greatly and this is the
00:53:34
difficulty of ultimately choosing its
00:53:38
coefficients the fab states or
00:53:39
pulsations for dampen the system so it
00:53:42
all depends if you have to summarize if
00:53:44
you have if you know
00:53:45
the damping and you want to impose it
00:53:47
consistently over the entire analysis
00:53:49
they will use
00:53:51
model compositions otherwise you the possibility
00:53:52
of using to use riley to at this point
00:53:54
I recommend that you first read
00:53:56
the dedicated post for for these choices
00:54:03
then we are another question can we
00:54:07
do a calculation with
00:54:08
variable thermal loading for example to
00:54:10
simulate the calculation of a structure in fire
00:54:13
so yes it is a ca from the moment
00:54:17
it is a loading we are going to
00:54:18
apply all the difficulty there
00:54:21
I imagine and to define the
00:54:24
function which will vary finally what
00:54:28
will be a variation of coefficient
00:54:29
over time which will apply on its
00:54:32
thermal loads so it is a load
00:54:34
like any other and which will vary over
00:54:36
time depending on the coefficients that
00:54:38
you have entered into your function or
00:54:40
into your curve of variations over
00:54:42
time or another question do you have an
00:54:47
example of determining 'one of the students
00:54:49
based on a temporal analysis to
00:54:51
simulate an explosion charge for
00:54:53
example, but I imagine that we can
00:54:56
find that perhaps in the literature
00:54:58
or on the internet etc.
00:55:01
there are queues as I said for
00:55:04
the previous point
00:55:05
the difficulty is often to
00:55:07
determine how the rice goes
00:55:10
for example for a shock or an
00:55:11
explosion
00:55:12
how exactly
00:55:15
the intensity of the loading varies over time
00:55:19
so we do not have a precise example but I
00:55:22
I think that we should be able to find either
00:55:26
on the internet or in the
00:55:27
literature, examples perhaps
00:55:30
even based on real tests of to
00:55:34
simulate an explosion is the way
00:55:38
in which the intensity of the charge varies
00:55:40
over time
00:55:51
not other questions for now
00:56:08
ok so
00:56:10
maybe stop there and so
00:56:15
how did I say at the start
00:56:17
of the presentation so the next
00:56:19
webinar will be devoted to
00:56:20
rolling loads and so we will present it
00:56:22
on June 23
00:56:24
our 2016 agent so I thank you
00:56:26
for your participation and we
00:56:29
hope to see many of you for the
00:56:30
next session
00:56:31
have a good end of the day soon

Description:

13ème Webinaire de la série "Renforcez vos compétences sur ROBOT" "Analyse Temporelle : Contexte théorique et mise en œuvre de l'analyse temporelle dans Robot" (Diffusé le 26/05/2016 à 15h00) Laissez vos commentaires sur notre page de feedback des webinaires : https://forums.autodesk.com/t5/robot-structural-analysis/robot-structural-analysis-webinar-feedback/td-p/5525908 Si vous souhaitez vous inscrire à cette série de webinaires : https://forums.autodesk.com/t5/robot-structural-analysis/robot-structural-analysis-webinaires/td-p/5524615

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