Article

Aspects of achievable performance for quarter-car active suspensions

Department of Electrical and Electronics Engineering, Anadolu University, 26470 Eskişehir, Turkey
Journal of Sound and Vibration DOI:10.1016/j.jsv.2007.09.014 pp.440-460

ABSTRACT In this paper, constraints on the transfer functions from the road disturbance to the vertical acceleration, the suspension travel, and the tire deflection are derived for a quarter-car active suspension system using the vertical acceleration and/or the suspension travel measurements for feedback. The derived constraints complement the similar constraints in the literature. By using the factorization approach to feedback stability, it is shown that tire damping couples the motions of the sprung and unsprung masses; and eliminates a constraint at the wheel-hop frequency. The influence of tire damping on the design of an active suspension system for a quarter-car model by a mixture of the LQG methodology and the interpolation approach is also illustrated.

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Keywords

active suspension system
 
factorization approach
 
feedback stability
 
LQG methodology
 
quarter-car active suspension system
 
quarter-car model
 
road disturbance
 
suspension travel
 
suspension travel measurements
 
tire damping couples
 
transfer functions
 
unsprung masses
 
vertical acceleration
 
wheel-hop frequency
 

Semiha Türkay