Optimal sliding mode control of semiactive suspension system

Key Words: Semiactive Suspension, Lqr, Sliding Mode Kontrol Whole body vibration is an important problem facing operators of heavy vehicles. Research has shown that drivers exposed to low frequency whole body vibration can experience temporary and even permanent injuries. One solution to this problem is to develop a semi active seat capable of canceling the vibrations felt by the driver. Several passive, semiactive, active, and fully active seats have been designed and built to address this problem. Controllers have been developed to optimize the seat performance. Vibration cancellation seating systems seem to be a promising and practical way to reduce the effects of whole body vibration. The semi active seat suspension system utilizes a spring and MR damper. Controllers were developed to control the acceleration of the seat, as well as cancel unwanted vibration. To simulation the performance of the Semi Active seat suspension system, the system identification of the seat was undertaken using open loop forcing functions. The seat was evaluated in each degree of freedom to understand the potential of the seat to cancel harmful vibration and acceleration.