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mehdienrique2000
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Join Date: Jul 2011
Posts: 9

Geometry of Car Suspenson

07/09/2011 2:19 PM

Does anybody know how can i find some technical data of a car suspension such as dimension,weight,rate of spring,total roll stiffness,etc... ?
The type of car and suspension is not important.
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lyn
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#1

Re: Geomerty of car suspenson

07/09/2011 4:10 PM

Why are you starting another thread on the same subject???

Have you tried searching, or do you just want us to read your mind?

If you are too lazy to even give us a clue what you've done, where you've looked, if at all you don't deserve any help!

Your admission that you were clueless is being reinforced here.
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redfred
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#2

Re: Geometry of Car Suspension

07/09/2011 8:05 PM

Well since this is for your school project, I'll tell you what I would expect as your adviser. I would expect that you will have to develop a valid linear control matrix for the dampening, spring and inertia for the suspension system, including the vehicular mass. Depending on the possible states you initially choose, the derivations into different geometric orientations will be difficult or easy to implement. I would expect that once you translate this matrix into one of the useful matrix canonical forms (I prefer the Jordan canonical form) that you should then be able to identify how much mass this suspension system can critically dampen and to be able to also prove the stability of the whole system. Now since you are working on the effect of a pot hole on this suspension system, I would insist that you identify the threshold where your entire system becomes non-linear and which non-linear mode your system has reached when you exceed each linear range. By using this approach you will be able to clearly identify those parameters you know from working from a real (measured) suspension component value and those that you must assume with some plausible value.

What I don't understand though is that since this is supposed to be your scholastic design project, why isn't your school providing you in your schooling enough information for you to do this on your own?

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mehdienrique2000
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#6
In reply to #2

Re: Geometry of Car Suspension

07/12/2011 8:50 AM

Hi mate,

Thank you veryyyyy much for your help.Actually,it's not school project,Im doing master in mechanical engineering.This is my final project,I have not any access to my supervisior cuz he has gone to his country. I think i can do it ,as u mentioned above, after forming matrix ,it can work it out by matlab.

my big problem is i couldnt find out any good geometry os suspension and wheel.I mean technical data such as diameter of tyre,stiffness of spring or damper technical data...

Im waiting for your reply.

Regards.
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redfred
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#7
In reply to #6

Re: Geometry of Car Suspension

07/12/2011 9:21 AM

Well I wouldn't wait for somebody else to provide you the three dimensional data on an existing suspension system. If you don't get any help from a vehicle manufacturer in handing over their designs, that should tell you something. You might get some help if you present the credentials of your school, adviser and maybe even your grades when you tell them that you wish to do an analysis of their product for your master's degree final project. Now you might consider going to a junk yard and measure any parameters you wish on a scrapped vehicle. You could also take a few measurements of your own vehicle. But don't wait for others to do your work for free, you will wait forever.

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mehdienrique2000
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#8
In reply to #7

Re: Geometry of Car Suspension

07/13/2011 4:52 AM

thank u very much.....it was kind of you to reply me and it was good direction to help me,

cheers mate.
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Doorman
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#9
In reply to #7

Re: Geometry of Car Suspension

07/13/2011 9:52 AM

I would like to know, who voted this comment as off topic? Good gosh a-mighty.

It appears that redfred voted himself the first five, but somebody piled on another? This is a very good response with some good advice, and I vote accordingly.

[edit] The 'Rate' dropdown box could be a source of confusion. I just about added another OT vote myself.

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Easyway
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#3

Re: Geometry of Car Suspenson

07/09/2011 10:52 PM

My favourite reference for such things is "How to Make your Car Handle" by Fred Puhn. It is easy to read and fairly thorough.
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mehdienrique2000
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#4
In reply to #3

Re: Geometry of Car Suspenson

07/10/2011 5:24 AM

thank u very much,it was good refrence!!!
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Ron
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#5

Re: Geometry of Car Suspenson

07/10/2011 3:39 PM

See also "Racing and Sports Car Chassis Design" by Costin & Phipps (also, note additional references at http://grassrootsmotorsports.com/forum/grm/recomend-books-on-chassis-design/11690/page1/)

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