Abstract
In this paper, the performance of automotive ride comfort using Bouc-Wen type magneto-rheological (MR) fluid damper is studied using a two degree of freedom quarter car model. The sliding mode control is used to force the MR damper to follow the dynamics of ideal sky-hock model. The model is tested on two excitations, the first is a road hump with severe peak amplitude and the second is a statistical random road. The results are generated and presented in time and frequency domains using Matlab/Simulink software. Comparison with the fully active, ideal semi-active and conventional passive suspension systems are given as a root mean square values. Simulation results, for the designed controller, show that with the controllable MR damper has a significant improvement for the vehicle road holding then its lateral stability as well as road damage in comparison with passive, fully active and ideal semi-active suspension systems.
Highlights
The function of automotive suspension system is to isolate the effect of road surface irregularities on the passengers to improve the ride comfort and it has to control the dynamic tyre load with acceptable suspension working space to enhance the vehicle stability and safety
To evaluate the suspension system performance, the sprung mass acceleration, suspension working space (SWS) and dynamic tire load (DTL) of the quarter car model are considered as a ride comfort criteria
It is noticed that by using the fully active and ideal semi-active systems based on LQR control technique, a high improvement in the ride comfort can be achieved at the expense of deterioration in the dynamic tyre load compared to the passive suspension as well as controllable MR damper suspension systems
Summary
The function of automotive suspension system is to isolate the effect of road surface irregularities on the passengers to improve the ride comfort and it has to control the dynamic tyre load with acceptable suspension working space to enhance the vehicle stability and safety. Most of previous research work in semi-active suspensions considered that the damping force can be controlled through mechanical changing for the damper orifice using hydraulic valves. A semi-active suspension using smart fluids with an adjustable viscosity to control the damper damping force, instead of hydraulic valves, has a considerable attention [7,8,9,10,11,12,13,14,15,16]. These smart fluid dampers are classified into two types Electro-rheological (ER) and Magneto-rheological (MR) dampers. Comparisons with the conventional passive, fully active and ideal semi-active are given as a root mean square values
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