Comparison of H∞ and μ-synthesis Control Design for Quarter Car Active
Suspension System using Simulink
Report and Opinion Journal, 12 (2):
41-54 (February 2020)DOI: 10.7537/marsroj120220.07
Abstract
In order to improve the road handling and passenger comfort of a vehicle,
suspension system is provided.
An active suspension system is considered to be better than passive
suspension system. In this paper, a linear quarter
car active suspension system is designed, which subjected to different
road disturbances. Since parametric
uncertainty in the spring, damper and actuator has been considered,
therefore robust control is used. H∞ and
μ−synthesis controllers are used to improve the ride comfort and road
handling ability of the car as well as to check
the robust stability and performance of the system. In H∞ design,
we design a controller for passenger comfort
purpose and to keep the suspension deflection small and to reduce
the road disturbance to suspension deflection. For
the μ−synthesis design, we design a controller with hydraulic actuator
and uncertainty model. We design a
MATLAB/SIMULINK model for the active suspension system with the H∞
and μ−synthesis controllers and we
made test using four road disturbance inputs (bump, random, sine pavement
and slope) for suspension deflection,
body acceleration and body travel for passive, active suspension with
controller and active suspension without
controller. Finally we compare the H∞ and μ−synthesis controllers
with a Simulink model for suspension deflection,
body acceleration and body travel simulation and the result shows
that both designs give good performance but H∞
controller has superior performance as compared to μ−synthesis controller.