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gold28
Forums Junkie

Location:
Madrid - Spain
Registered:
August 2002

Re: AE86 front suspension

Tue, 08 June 2004 00:33

TurboRA28 wrote on Sun, 06 June 2004 19:02

I'm trying to find out how to match shocks to the spring rates but still not sure. I talked to KYB's technical department and even they couldn't help me with it.

Damn, you got me thinking now.....curse you I hate thinking....it has been a long time since I studies this sort of thing at uni, but if my memory serves me correctly (it rarely does), spring stiffness is a direct result of displacement, whereas theoretical damping only affects velocity, A bit like putting friction into the suspension, slowing it down.

Car suspension is supposed to be critically damped, that is it should return to the nominal (static ride height) position as quickly as possible. If it is under-damped, it will porpoise and if it is over damped it will be too slow to return to the nominal position.

Looking at the standard equations for damped simple harmonic motion, it is clear that the magnitude of the damping (damping constants are negative) needs to be increased (more negative) for an increase in the spring stiffness.

acceleration + (velocity x damping) + (displacement x natural frequency^2) = 0 ------------For all thoes who care to look.

where the natural frequency is the square root of K/M and K is the spring constant.

Now being that the damper and spring are coaxial, it may be that we can come up with a way of comparing the spring and damper, ie if the spring goes up by 20% then the damping should go up by 20%. But I will need to read up a bit more before I could recommend that approach.

Oh and Joel, if you talk to the sales department, you will only get what the catalogue tells you. You need to get in touch with their engineering department for answers to any difficult questions.

I will do some reading over the next couple of days and see what I come up with.

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