Abstract
In this paper, an 8-DOF model including driver seat dynamics, subjected to random road disturbances is used in order to investigate the advantage of active over conventional passive suspension system. Force actuators are mounted parallel to the body suspensions and the driver seat suspension. An optimal control approach is taken in the active suspension used in the vehicle. The performance index for the optimal control design is a quantification of both ride comfort and road handling. To simulate the real road profile condition, stochastic inputs are applied. Due to practical limitations, not all the states of the system required for the state-feedback controller are measurable, and hence must be estimated with an observer. In this paper, to have the best estimation, an optimal Kalman observer is used. The simulation results indicate that an optimal observer-based controller causes both excellent ride comfort and road handling characteristics.
Highlights
Demands for better ride comfort and controllablity of road vhicle motivate many automotive industries to consider the use of active suspension
This paper illustrates the importance of passenger dynamics when the objective would be to improve the passenger ride comfort as well as to satisfy the road handling requirements
The objective of this paper is to examine the use of optimal state-feedback controller to improve the ride comfort in a passenger car
Summary
Demands for better ride comfort and controllablity of road vhicle motivate many automotive industries to consider the use of active suspension. Active suspension requires sensors to be located at different points of the vehicle to measure the motions of the body, suspension system and/or the unsprung mass. This information is used in the online controller to cammand the actuators in order to provide the exact amount of force required [2,3,7]. In any vehicle suspension system, there are a veriety of performance parameters which need to be optimized These parameters include, among others, four important quantities which should be considered carefully in designing a suspension system: ride comfort, body motion, road handling, and suspension travel. This paper illustrates the importance of passenger dynamics when the objective would be to improve the passenger ride comfort as well as to satisfy the road handling requirements
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