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As subject, i havent found a satisfactory answer at present. any reply is welconmed,thanks in advance!

It's complex motion process,the nature of force vs velocity ever confused me too,see my thread, hope it help you understand it. Click this site:http://www.eng-tips.com/viewthread.cfm?qid=308996

HEY,everyone here,i havnt been here for a long time,are all of you fine? Recently,i read the book"chassis system design methodology".In the book,One sentence goes like this:"The overall design of suspension systems is mainly driven by several key factors, including handling, ride,package, cost...

ibelatti,That is what i have been confused about recently.But,a new question is confusing me.Why we set the test movement as a sine wave,does it realy reflect real-life operating condition? Anad,is the reason is that the shock absorber is usually assembled near the spring,and the moment of...

The attachment is the picture of the test site.http://files.engineering.com/getfile.aspx?folder=1c49f6fd-35f2-4b0b-9ba0-c5fe6aedf5d7&file=2044.JPG

gt6racer2 I have uploaded a test chart of some kind of shock absorber,see the attachment.In my view, it is "a "constant velocity form" as you said.I marked the compression curve with corresponding velocity.Is the diagram the "football" curve you mentioned in your...

gt6racer2 Now I'm very suer your answer is right.But The book i read only talks about the test methods,not telling me how to measure external characteristic of shock aborber on test bed.I think about this:the frequency of test shock absorber "n" is constant,does it mean that absorber piston...

Thanks for your reply,gt6racer2! But i can't still understand "V= omega r",you know, the "V" represent the piston straightlinear speed ,because it move up and down.and "V= omega r" means something is in circular motion,coudl you plz tell how this relationship forms.

Sorry fot not giving the unit of n which is c、p、m（count per minute)

I read the stand test method of automotive telescopic shock absorber ,but i dont understand how the following formula comes: v=(π*S*n/6)*e-4 m/s where s is the the stroke(travel) of the test shock absorber piston (mm) n is the frequency of test shock absorber...

Thank you for your reply,BrianPetersen . so the "refresh" work is more focused on the car'c looking,with mo changs of chasis,perhaps because of keeping or increasing market share for certain model. BUT, the "redesign" work is not so simple to explain.IT's focused on technical improvements,such...

Do they mean the same way of changing a model? If not,what particular emphasis do they have respceticvly. Any answer is appreciated.

Disgruntleddave!where are you?

Most of graduates in my country really want to work in product development technology center only after 6 months of intership in Fab. shop.But in effect, they dont have enough practical experience in manufaturing shop in such short period,which is very helpful to their future career...

Could anybody give me some information about it? appreciated!

Thank you for your answer! The PID control does represent Proportional, Integral, Derivative control !

The dynamic behavior of a non-linear 8 degrees of freedom vehicle model having active suspensions and a PID controlled passenger seat is examined. thanks in advance~