New semi-active suspension controller design using quasi-linearization andfrequency shaping

A semi-active suspension system is considered to be one of the most realist ic solutions for improving the ride quality of large commercial vehicles, b ecause of its smaller energy consumption compared with that of active suspe nsion systems. A semi-active suspension system is classified as a kind of b ilinear system to which linear control theory cannot be applied. A new meth od of designing a controller for semi-active suspension systems using quasi -linearization and frequency shaping is proposed here. The validity of the proposed method is shown by computer simulation results and vehicle test re sults for a sight-seeing bus. (C) 1998 Published by Elsevier Science Ltd. A ll rights reserved.