CMF_Polarbear
» CMF Member
Hey guys. This might be a bit weird but I'm doing an engineering course and they want me to do a basic model of my car. So I need spring stiffness and dampning. Anyone know if I can get these figures easily?
Spring stiffness
- Thread starter CMF_Polarbear
- Start date
CMF_Greo
» CMF Memberthere is that k11 wiki might have it?
CMF_Polarbear
» CMF MemberAh it's all good man. Reread the question and I am meant to make up values based on the mass and the assumption that at full load resonance is at 2hz.
CMF_MattyK
» CMF Member2Hz is race stiffness...
and I assume you're meant to calculate values, not make them up...
remember to square your motion ratio, and work out the (unsprung) mass at each corner. If you're anal you'll use a slightly higher resonant frequency in the rear than the front - this is typically recommended by race suspension engineers.
Damping ratios are typically less than 1, but rebound is usually much stiffer than bump, and the damping coefficients are typically not constant (rather, speed dependant).
and I assume you're meant to calculate values, not make them up...
remember to square your motion ratio, and work out the (unsprung) mass at each corner. If you're anal you'll use a slightly higher resonant frequency in the rear than the front - this is typically recommended by race suspension engineers.
Damping ratios are typically less than 1, but rebound is usually much stiffer than bump, and the damping coefficients are typically not constant (rather, speed dependant).
CMF_Polarbear
» CMF MemberHaha little more in depth than I really need Matty. That's pretty much what I planned to do BUT I only have to do a single degree of freedom model. 1 mass, 1 spring, 1 damper 
Easy as pie.
Easy as pie.
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