Forces In a Suspension Smile
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Posted by: himes19

03/30/2006, 12:21:14

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I am desingning a suspension. I know lots about mechanical engineering and desing but i just cant find how to calculate the forces when the tires impacts a bump. I would apreciate any help.




j.h.


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Re: Forces In a Suspension
Re: Forces In a Suspension -- himes19 Post Reply Top of thread Forum
Posted by: zekeman

03/31/2006, 16:24:28

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Depends on the bump you postulate, or hole. Then you can write dynamic equations for the mutidegree of freedom system.







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Re: Forces In a Suspension Idea
Re: Re: Forces In a Suspension -- zekeman Post Reply Top of thread Forum
Posted by: rfox71

04/04/2006, 11:19:43

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Hey,

I pulled this model from my systems book:
Introduction to Dynamic Systems Analysis, T.D. Burton
McGraw-Hill 1994. Its a fairly simplified model but addresses the concepts I believe you were curious about.

Robert


1_carmodel.GIF (23.6 KB)  






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Re: Forces In a Suspension
Re: Re: Forces In a Suspension -- rfox71 Post Reply Top of thread Forum
Posted by: zekeman

04/05/2006, 20:36:47

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Good, thats the model. Now what you have to do is write the 4 diff equations and postulate some reasonanle bump, say f(x)=sin(x)(with limits) on the front wheels and f(x+xo) on the rear tires which you get on the front wheels. Now assume some forward velocity, say v,
then the forcing motion at the tires are
F=f(vt) and F=f(vt+xo)
dF/dt=f'(vt) and dF/dt+f,(vt+xo)
on the front and back tires.
Now solve this using some canned computer program like SPICE.







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Re: Forces In a Suspension
Re: Re: Forces In a Suspension -- zekeman Post Reply Top of thread Forum
Posted by: zekeman

04/05/2006, 20:48:07

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Correction.
The velocity equations should read:
dF/dt=v*f'(vt)and dF/dt=v*f'(vt+xo) for the front and rear tires .







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