Abstract
This paper deals with multi-objective active suspension systems that employ electromechanical actuators having significant unknown lags. In the presence of actuator lags, the sprung mass system becomes an uncertain mismatched system for which the conventional sliding mode control (SMC) loses its celebrated property of invariance. Apart from compensating for the actuator lags, the suspension system is also required to fulfil a multi-objective role in which ride comfort and ride handling are both catered to. For this purpose, this paper proposes a new functionally graded sliding mode control (FGSMC). The effectiveness of FGSMC in meeting the conflicting objectives of the ride comfort and ride handling is analysed and validated by simulation for a bump and dip profile and an ISO class D profile and by experimentation on a popular laboratory setup.
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