On the performance limitations of quarter-car active suspension models

TC7.1 - Automotive Control;ASME Dynamic Systems and Control Division;IEEE Technical Committee on Automotive Controls;American Automatic Control Council
5th IFAC Symposium on Advances in Automotive Control, AAC 2007 -- 20 August 2007 through 22 August 2007 -- Aptos, CA -- 85818
In this paper, constraints on the road disturbance transfer functions are derived for a quarter-car active suspension system. The derived constraints complement the existing constraints in the literature. By using the factorization approach to feedback stability, it is also shown that tire damping couples the motions of the sprung and unsprung masses; and eliminates a wheelhop constraint. The influence of tire damping on the design of an active suspension system for a quarter-car model by the LQG method is illustrated.
1 This work was supported in part by the Scientific & Technological Research Council of Turkey under Grant 106E108.