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Video tags
Subtitles
Russian
00:00:01
suspensions work, the designs00:00:02
load transfer shock absorber00:00:05
roll intake and how that happens00:00:07
in our cars well we're going to see00:00:08
that right away in this video we're00:00:10
tackling a big piece of the suspension of the00:00:12
hyperc project so I don't tell you00:00:14
about that it's a suspension which is00:00:17
made up of a shock absorber and a00:00:19
spring we call it a combination no here00:00:21
we are going to talk about the suspension in general00:00:24
on a car so shock absorber triangle arm00:00:27
and kinematics and overall the00:00:30
ground connection and since we are talking about00:00:32
ground connection there is a small00:00:34
French tire manufacturer who gave a little00:00:36
help on the project I00:00:38
tell you all about it in the video the00:00:40
dolipran we do them al Gan are00:00:41
suggested come on it's00:00:43
[Music]00:00:48
started at the start the suspensions are00:00:50
for comfort at the time the roads00:00:52
are dirt the wheels they are made of00:00:54
wood or scrap metal there are no tires00:00:56
what so well the guys quickly understood00:00:58
that it was a pain in their backs and ass from00:01:01
the first meters of the car and not to00:01:02
mention that the chassis00:01:03
also had to take a good hold in the mouth so we00:01:05
invented the suspension there were lots of00:01:07
different systems but the best known00:01:09
remains that of leaf springs it's a00:01:11
bit like an adjustment in fact it's a00:01:13
piece of metal which deforms moreover00:01:15
it's a system which is still00:01:17
used especially on large vehicles00:01:19
like the 44 heavy goods vehicles and00:01:21
all these things except that at the beginning of the00:01:23
1900s we see the appearance of a00:01:25
new system on the suspensions which00:01:27
complements the springs the cushioning00:01:30
the problem with the spring is that it bounces00:01:32
yes it is good for absorbing a shock on00:01:34
a road but if after you wobble00:01:36
for 3 km you will quickly feel like00:01:38
puking so we have developed00:01:39
something which cushions and calms its00:01:42
spring oscillations a shock absorber00:01:44
the first shock absorbers installed on00:01:45
cars from the 1930s are00:01:47
friction basically you have two materials which00:01:50
rub and well it brakes and therefore it00:01:52
cushions well it's something which was quickly00:01:55
released because the wear was very rapid and00:01:58
it wasn't something crazy crazy what that's it00:02:01
is crap we will still note00:02:02
that there of horses persisted with this00:02:04
system almost until the end of its00:02:06
production we then come to the00:02:08
current oil or gas system the00:02:11
principle it is simple he it is like00:02:12
a syringe we have a cylinder and a00:02:15
piston we make holes in the piston00:02:17
the smaller the holes the00:02:18
harder the shock absorber will be to compress or00:02:21
relax and with a whole00:02:23
check valve system we can have a00:02:24
different hole size for00:02:26
compressions and the detents and finally we00:02:28
can even have adjustments on00:02:29
shock absorbers or even00:02:31
remotely controlled shock absorbers which adapt to00:02:33
real time the future which you will have00:02:35
understood all this is for comfort00:02:37
but the cars have gone further00:02:39
faster and comfort has been put on an00:02:41
equal footing with performance after that it00:02:44
of course depends on the car and its00:02:45
use let's talk performance00:02:47
now we're making a hyperc we're00:02:48
not making a horse-drawn carriage we're talking about00:02:50
shock absorber spring that's it really the basics00:02:52
but it's not just that we have the00:02:54
anti-roll bars the drawings and all that stuff00:02:57
but how does it all work and00:02:58
why it's important on a car00:03:01
I'll explain to you on a car we have a00:03:03
big notion that is calls for00:03:05
load transfer and this Tru is ultra important00:03:08
and it's one of the things to manage when00:03:09
driving simple example you have a00:03:11
one ton car with a00:03:13
weight distribution of 60% on the rear so we00:03:15
have 600 kg on the rear wheels and 40000:03:19
kg on the front wheels when this00:03:21
car accelerates the load will00:03:23
move on the rear wheels and00:03:25
from that moment we no longer have this00:03:27
distribution of 60% on the rear we00:03:30
will have, I don't know, 70 80 so the front00:03:33
will be relieved it will relax and00:03:36
that's why the car will pitch up00:03:38
a little and the front will rise and well00:03:40
that's a transfer of load we00:03:42
took the case of acceleration but it00:03:43
also works with braking so00:03:45
conversely the front wheels are loaded00:03:48
so the wheels will00:03:50
really be compressed compressed00:03:52
while the rear wheels will00:03:54
be unloaded and of course it00:03:55
also works in the turns the00:03:57
outer wheels of the corner will be00:03:59
more loaded than the inside wheels and00:04:01
all these load transfers cause00:04:03
body movements like that's00:04:05
rolling like that's pitching and that00:04:07
's pumping on a perfect road00:04:09
so without Bos without unevenness in short, the00:04:12
thing really is it's a billiard table00:04:13
we can on the one hand harden the00:04:16
springs and shock absorbers to limit00:04:18
the rolling and pitching so00:04:20
everything that is well body movement00:04:22
and that's why that00:04:23
track cars like Formula 1 the DTM all00:04:25
these things they have00:04:27
ultra hard suspensions or even no suspension at00:04:29
all like karting for example but00:04:31
if we start to have a track with00:04:33
defects bumps slopes and00:04:35
so on in this in this case the car will00:04:37
jump so well for the back it's not00:04:39
great and then well for the performance well00:04:42
it's even worse why it's worse00:04:44
well obviously since it's jumping we're going to00:04:45
lose a lot of grip on the level of the00:04:47
tire so the solution is to soften00:04:49
the suspensions and that can go to00:04:51
the extreme if the terrain is really00:04:53
particular so here it is hardened well it's00:04:56
good to avoid having00:04:58
body movement and everything but if you you have00:04:59
small imperfections on the road well00:05:01
you have to soften the suspensions a little00:05:02
otherwise you will lose grip00:05:04
and the magic word in motorsport00:05:06
is compromise so in all00:05:08
cases the hypercar we need firmness00:05:11
to limit body movements00:05:13
but not too much because otherwise we lose00:05:15
grip and in any case00:05:17
we have a suspension that works and00:05:19
therefore we cannot avoid the nasty00:05:21
roll and the nasty tengage but we can00:05:24
control them j 'hope that I explain00:05:26
well that it is not simple by the way00:05:27
speaking of that I take this opportunity to00:05:29
remind you ESS to watch these videos they00:05:30
are ultra technical at the moment they00:05:32
relate to pure theory there is00:05:34
nothing physics nothing real everything is00:05:36
on the computer and yet there are a00:05:39
lot of you following them so thank you very00:05:41
much a little thumbs up00:05:43
anyway the rat so to summarize this00:05:45
first part we have00:05:47
load transfers in acceleration in braking and when00:05:50
cornering we have a suspension which works00:05:52
to ensure comfort and grip00:05:55
on the road and all that causes00:05:57
rolling and pitching therefore00:05:59
body movements and these last two things well00:06:01
we don't want too much or at least we00:06:03
would like control them why then and00:06:05
well because by acting on that we act00:06:07
directly on the performance of the00:06:09
chassis to control all that we can of00:06:11
course give in to the hardness of the00:06:13
shock absorbers we saw it a little above00:06:15
we are not talking about springs here we are00:06:17
once again talking about just the shock absorber00:06:19
a shock absorber which is hard will make the00:06:21
suspension movement slower and00:06:23
therefore a softer body movement00:06:26
conversely with a soft shock absorber00:06:28
which will make the movements much00:06:30
faster manage this speed of movement00:06:32
of body is good for the driver's feeling00:06:33
on board the car it's a00:06:35
question of feeling too but hey if the00:06:37
feeling is all rotten well in fact00:06:39
you won't perform well with the car00:06:40
it's a feeling but it's also de la00:06:41
Perre in motorsport it is extremely00:06:43
important that the driver is comfortable00:06:45
and can know how the car00:06:47
behaves but all this is not enough00:06:50
so we invented the entiroui bar which00:06:52
serves, as its name indicates, to reduce00:06:54
the rolling of the car the rolling00:06:56
is that he as a reminder so it00:06:57
occurs especially in the turns00:06:59
the principle it is simple the two00:07:00
suspensions of the same train are connected00:07:03
by a bar more or less flexible if00:07:04
one of the two wheels of the train is00:07:06
compressed the bar will act on the other00:07:08
suspension the harder the bar is and00:07:09
therefore rigid the less independent the suspensions will be of00:07:12
course it is a big00:07:14
mess to develop since the00:07:16
four suspensions of a car00:07:17
work in harmony and this is what00:07:19
partly defines your00:07:21
mechanical balance on the car basically if00:07:23
your car will be more or less playful00:07:26
more or less under or oversteer it's00:07:28
really prim moral as thing on the00:07:30
GT40 we had very widely experimented with00:07:32
the thing and all the subtlety of the good00:07:35
behavior of the chassis of the chassis and00:07:38
all the subtlety of the good behavior00:07:40
of the chassis played out on the hardness of the00:07:42
front and rear Rouis bars we00:07:45
seek to handicap more or less one00:07:46
train in relation to the other to give00:07:49
more or less less understeer for example00:07:50
and if you haven't seen the series at00:07:53
Michelin's research and development pole with the GT40 I00:07:55
recommend it to you, it puts into practice everything we00:07:57
see in this video and Michelin00:07:59
we're talking about it. is the small00:08:01
tire manufacturer that I introduced to you at the00:08:02
start of the video they were there for the00:08:03
GT40 and well they are also there to help00:08:06
me in the development of the00:08:09
kinematic suspension designs of the hypercar00:08:12
yeah we couldn't agree better guys00:08:14
there, it's going to be a gem and yeah00:08:16
last year's collaboration with the00:08:18
GT40 is well and truly over but we00:08:20
kept in touch with engineers like00:08:22
Gilles or Franck and they helped me with00:08:24
their personal time in the development of the00:08:26
suspension designs of the hypercar it's00:08:27
great class and all that in addition to00:08:30
their normal work so you really have to00:08:32
give them a big thank you in the comments I00:08:34
say thank you once again00:08:35
really it's is so cool guys the00:08:36
suspension designs another term to00:08:39
develop the movements of the00:08:40
suspension roughly speaking when the wheel00:08:43
goes up and down results from the00:08:46
suspension designs a wheel does not stay00:08:48
perpendicular to the road it takes an00:08:50
angle here from camber but it can00:08:53
also be pinching in the case of00:08:55
camber the fact of taking00:08:56
camber and well that optimizes00:08:59
the grip of the tire on the track and00:09:01
it is therefore necessary to ensure00:09:03
performance, comfort and above all also00:09:05
safety and C tle of camber it00:09:08
is caused by the suspension designs00:09:10
the suspension designs are really00:09:11
mathematical geometry here we see00:09:14
the suspension measurements of the GT4000:09:16
at Michelin on their00:09:18
kinetic and kinematic knc bench in fact we00:09:20
come to activate the suspensions in00:09:21
all the sense and we measure the movement00:09:24
of the wheel with the sensors to see00:09:25
if it takes camber or not00:09:28
if it takes toe or00:09:29
opening in short all these thingsl and we00:09:30
do it for pumping and taking up00:09:32
roll and all these tips for all00:09:34
situations on the hypercar we will00:09:36
anticipate this wheel movement and00:09:38
above all determine it thanks to00:09:39
the development of the drawings if you want00:09:42
we will know in advance what00:09:44
the sensors of this famous front knc bench will give00:09:47
even to put the car on this00:09:49
knc ban we are going to do all this in anticipation00:09:51
with calculations and drawings00:09:53
precisely so it's a little00:09:55
complicated I will try to give you00:09:56
a concrete example so that you00:09:58
really have an idea from the impact of the00:09:59
drawings we take the case of a00:10:01
double wishbone suspension with the00:10:03
lower and upper triangles which00:10:05
is used on racing cars00:10:06
in general if we stand from the front00:10:08
and put the two00:10:10
identical triangles our wheel will remain00:10:12
perpendicular to the wheel when00:10:14
pumping so that a priori it is not serious00:10:16
but when rolling it takes00:10:19
positive camber and I remind you00:10:21
that the rolling happens at each turn00:10:23
no luck that's there where we need00:10:25
optimal grip there as you00:10:26
see in the drawing we clearly00:10:29
do not have at all the entire surface of the tire which00:10:31
is in contact with the road the solution00:10:33
here is to reduce the length of the00:10:35
upper triangle and there magic this00:10:37
time we have our00:10:39
negative camber when rolling and therefore we have00:10:41
a tire which offers all its grip00:10:43
during the support in turns and when pumping00:10:45
we still have a tire which remains not00:10:47
too bad what and well this example that we00:10:49
have just seen there well that's what the00:10:50
drawings are, finally that CEN is one and in fact00:10:53
a car there are several of them there are00:10:54
lots of geometric drawings which will00:10:56
determine the angles to the wheel that it00:10:58
is on camber as we have just00:10:59
seen or on parallelism it is00:11:02
also determining the angles of the00:11:04
steering the turns to direct the00:11:07
flying torque so as not to make the00:11:08
pilot's arms suffer in short it is00:11:10
quite a chance and it it's not obvious and00:11:12
again we didn't take into account00:11:13
the elasticity, that is to say the flexibility00:11:16
of the chassis and the block eyelashes,00:11:17
calm down at the time I had already00:11:19
experimented with the suspension designs on the00:11:21
GT40 project well of course we don't do that a la00:11:24
zob in fact the drawings are not00:11:26
very complicated to trace or to00:11:28
understand I mean it's really00:11:29
middle school level geometry on00:11:31
the other hand it's precise we are not at the00:11:33
degree but at the die of degree and00:11:35
the influence it is enormous on a00:11:37
car and the hardest part of all that00:11:38
is to know what we are doing we were talking00:11:41
about camber but about rolling00:11:44
earlier but how many degrees00:11:46
concretely it need camber for00:11:48
how many degrees of rust00:11:50
and for how many gellaterals how much00:11:53
com how much we are missing00:11:55
input data and these input data00:11:57
are obtained partly by00:11:59
calculations but also and above all by00:12:01
the experience and tests in condition00:12:04
or in simulation and on top of that it's00:12:05
subjective it's a judgment when driving00:12:07
it's a mess the thing on the GT40 I00:12:10
made drawings I was inspired by00:12:12
several geometries which existed on00:12:14
cars obviously I didn't take00:12:16
Twingos, don't mess around and I00:12:18
did something which should work00:12:20
with experience well from observation00:12:22
which quite simply with photos which00:12:24
I found good the result00:12:25
actually well It doesn't work00:12:27
too badly, we saw it at Michelin, it's00:12:29
not at all catastrophic, it's actually quite00:12:30
good, it's not perfect and00:12:32
remember the GT40 has00:12:33
heavy steering, it's one of the00:12:35
downsides of my car even if we00:12:37
can still drive it but00:12:38
it's not assisted so this problem00:12:40
could have been avoided thanks to00:12:42
suspension designs with data well that00:12:44
I could have optimized just that00:12:46
at the time well I didn't have enough00:12:48
experience at that level today00:12:50
well I already have more experience thanks to00:12:51
the GT40 and everything I learned00:12:53
in the meantime and I especially have that00:12:55
of the guys who work on the subject at00:12:58
Michelin and it is notably the team at00:12:59
simix the same ones who00:13:01
developed the GT40 for me and who are00:13:03
focusing on it today basically00:13:05
they are going to help me to determine the00:13:07
pivot points of all the00:13:08
suspension triangles and the steering linkages00:13:10
if we diagram a suspension triangle00:13:12
well it is a triangle so you00:13:14
have three00:13:15
points and it is the position of these three00:13:18
points in 3D space which is00:13:20
necessary and that's what Michelin is going00:13:22
to provide me with PO coordinates here, an00:13:24
Excel table, so how did00:13:26
we go about synchronizing and determining to00:13:28
finish all that already, we have to prepare00:13:30
a 3D, the monocoque, well there are the00:13:34
wheels they are here that it doesn't change00:13:36
it's not negotiable then well we're going to00:13:38
put a rack it's going to be00:13:39
approximately here the shock absorbers we're going to00:13:42
put them over there the engine and the box they00:13:44
are a little near here we're doing a00:13:46
positioning of all these components00:13:48
in space where it should be in00:13:50
fact placing the elements like that at the00:13:51
zob it will allow us to have our00:13:54
footprint because if Michelin00:13:56
gives me points and triangles which00:13:58
hit the monocoque or or other00:14:00
things or in the shock absorbers or in00:14:01
What do I know it's not going to do it so we00:14:03
have to give them a work space and00:14:05
so that's why I prepare00:14:06
a 3D for them with the elements that are already00:14:08
there and that 'we must avoid touching with00:14:10
the triangles and all the00:14:12
suspension elements otherwise it will work much less well00:14:13
eh something else to provide to00:14:15
Michelin well it's quite simply the00:14:16
specifications of the car we do00:14:18
n't want a bus we don't want one 44 we don't want00:14:21
a van we want a00:14:23
high performance sports body so we have to00:14:25
give them some information that I have00:14:27
determined some of which are00:14:29
estimates but hey that's how it is you have to00:14:31
start with something so wheelbase00:14:33
track width size00:14:35
of the tires distribution of the masses of the00:14:37
car the ground clearance that I00:14:40
then want is a lot of exchanges with00:14:41
the guys from Michelin in particular on the00:14:43
mechanical technical constraints to see if00:14:45
well nothing affects as I00:14:47
told you earlier time on the Michelin side they are00:14:48
doing tests they are testing in00:14:50
simulation and over time he00:14:52
gives me first versions on my 3D00:14:54
so basically as I told you00:14:55
Michelin he gives me a table with the00:14:58
coordinates of each point and once00:15:00
put on my 3D it looks like this so we00:15:02
played pingpong several times they00:15:03
sent me several versions only00:15:05
because we had some touch-ups to do00:15:06
especially in terms of dimensions00:15:08
because well there were points00:15:09
like I told you that it affected00:15:11
other elements so it was necessary00:15:12
to modify except that if you modify a00:15:14
point well it can potentially00:15:16
screw up your entire suspension design and we are00:15:19
even talking about the front and rear axle00:15:20
so if you make a modification on00:15:22
the rear potentially all the rest00:15:24
of the points will change and we arrive at a00:15:27
version which goes well and which bothers00:15:29
no one everyone is happy the00:15:30
guys from Michelin me too a00:15:32
magical thing all the same we must emphasize00:15:33
this car it has never rolled it's00:15:35
not even built but we00:15:37
already know its behavior on the track thanks00:15:40
to the Michelin simulator and that's00:15:42
completely crazy eh and well yes00:15:44
anyway the driving is a feeling you ca00:15:46
n't measure it you test it you feel it00:15:48
Franck the Michelin test driver well00:15:50
he tested the car as well as the team00:15:52
who worked on the project besides00:15:54
the big up team thank you very much if00:15:57
you remember the CAD it00:15:58
looks like this so we have the monocoque in the00:16:01
center and we even have the passenger compartment in short everything00:16:03
is done except the front and00:16:05
rear cradles of the car and in fact well00:16:07
before making these cradles I was00:16:09
just waiting for the suspension points from00:16:11
Michelin to be able to build around it00:16:13
I couldn't move forward without that otherwise00:16:16
it would have made a lot of modifications and00:16:17
I would have wasted time it was00:16:19
useless so that's why I preferred to00:16:20
do the passenger compartment at the time so here is00:16:22
all this work for a00:16:24
chassis skeleton which looks like that but00:16:26
believe me it's madness it doesn't seem like00:16:28
it doesn't seem like the subject it's ultra00:16:31
complex I hope you were able to00:16:33
follow along and that you learned a lot of00:16:35
things in this video so I don't have00:16:37
could go further otherwise well we00:16:39
still have 3 hours and then well I lose00:16:41
everyone so that's not the goal but00:16:43
it's also for reasons of00:16:44
industrial secrecy and yes above all that this00:16:46
study was carried out with the help from the people00:16:48
at Michelin so the00:16:50
Michelin expertise so well that's what00:16:52
besides we still have to measure the00:16:53
weight of this sentence the hyercar it will00:16:55
have a hammer chassis before even00:16:58
having done the first laps of00:16:59
track it's going to be crazy so00:17:02
thank you very much to the people who00:17:04
worked on the project thank you Michelin00:17:07
simix before moving on to the moment T I00:17:09
remind you that you will find in the00:17:10
description the shop for the00:17:12
clean foxé t-shirts like this one00:17:14
allows you to support the project and well00:17:17
thank you don't forget that the00:17:18
quantities are00:17:22
limited the moment the moment I00:17:24
tell you the progress of the project at the00:17:26
present moment the CAD of the before is 9500:17:30
% complete it I just miss the portemyux to00:17:32
draw it's going to be size and00:17:33
mass parts with aero type aluminum it's00:17:36
going to be nugget oh it's going to be beautiful this00:17:38
kind of part the rear cradle it00:17:40
moves really well it's a big baby00:17:42
this one there because there is the entire00:17:43
powertrain and after 2 months00:17:46
on it I am at 85%. overall00:17:49
the CAD is almost finished00:17:51
it's crazy I can't believe it I00:17:52
'm so happy it really looks like00:17:54
hell I'm trying to go into as much00:17:56
detail as possible really it's00:17:57
quite beautiful I think the next00:17:59
videos will really deal with the00:18:00
cradles so I think you will00:18:02
enjoy it because we will really see the00:18:03
shape of the chassis it's beautiful00:18:04
mechanics overall I also have a00:18:06
huge project to present to you which Arve00:18:08
at the beginning of 'year 2024 because00:18:09
the hypercar is not just parts to00:18:12
buy, spare parts, it's00:18:13
also essential means of manufacturing00:18:15
new machines, a00:18:18
place that's cool, glass, I can't wait to00:18:20
start manufacturing if you do00:18:21
n't want to miss it don't hesitate to00:18:23
like share the video if you00:18:25
liked it comment if you have any00:18:27
questions don't forget to also AB00:18:28
as for me I'll tell you see you next time00:18:31
[Music]00:18:39
alwaysDescription:
🛒 La boutique de fringue : https://fautqucestpropre.com/ On attaque la grosse mécanique sur l'#Hypercar : les systèmes de #suspension. Gros bug up à mes amis de chez SiMix Michelin pour l'aide apportée au projet. le site : https://simix-engineering.michelin.com/ Mon logiciel 3D : Solidworks Retrouve #BenjaminWorkshop aussi ici : 📲 INSTAGRAM : https://www.facebook.com/unsupportedbrowser 📲 Twitch: https://www.twitch.tv/benjaminworkshop 📲 Discord : https://discord.com/invite/Jv95yqqcux 📲 Facebook : https://www.facebook.com/unsupportedbrowser 🛒 T-Shirt dispo : https://teespring.com/fr/stores/faut-qucest-propre ⚙️ Mes formations : https://www.benjaminworkshop.com/formation/ Contact pro : ✉️ Email : [email protected] -------------------------------------------------------------------------------------------------------- Mon matériel (vidéo) : Caméra 1 : https://www.amazon.fr/gp/product/B00ZS6F30I?ie=UTF8&creative=6746&creativeASIN=B00ZS6F30I Caméra 2: https://www.amazon.fr/gp/product/B06XXNVY97?ie=UTF8&creative=6746&creativeASIN=B06XXNVY97 Kit lumière : https://www.amazon.fr/gp/product/B00KDW66JE?ie=UTF8&creative=6746&creativeASIN=B00KDW66JE Trépied : https://www.amazon.fr/gp/product/B005KP473Q?ie=UTF8&creative=6746&creativeASIN=B005KP473Q -------------------------------------------------------------------------------------------------------- Crédits musique : Youtube Library ------------------------------------------------------------------------------------------------------- Certaines URL proposées dans cette description sont susceptibles d'être affiliées
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