ROBUST CONTROLLERDESIGN WITHROAD ADAPTATION OF SEMI-ACTIVE SUSPENSION SYSTEM

Abstract

Road profile is considered as an essential input that affects the vehicle
dynamics, it is known for unknown input signal, depending on the velocity of the
vehicle and the road class’ roughness. Accurate information of this data is
fundamental for a better understanding of the vehicle behaviour and vehicle
control system design. In this present paper, the road profiles are generated
according to the ISO 8606:2016 standard to compare the differential of the road
profile when changing the conditions. The semi-active suspension techniques are
the solution to this problem and capable of reducing road vibrations effectively. The
vertical quarter car model is installed with semi-active suspension system using
Electrorheological shock absorber (ER damper) also considered to study the
response of the vehicle to the road profile. The H∞ control method is used to design
the controller for the semi-active suspension system by minimizing the closed-loop
impact of disturbance and perturbation from the inputs to the controlled outputs.
The comparison between the passive suspension and the semi-active suspension
systemsare shown the positive effect of the robust controller scheme when
enhancing two criteria of the vehicle oscillation are comfort and road holding.