Abstract:

According to the random disturbance and noise in disk drive servo system and the traditional PID control has the disadvantages of lag or overshoot, and the traditional sliding mode control has the faults that ask for system uncertainty factors to be known. Then, this paper proposes the exponential approach law sliding mode control method based on the Kalman filter. The method of designing a sliding mode controller based on the reaching condition of the exponential approach law can handle the uncertainty problems in disk drive servo system better, and it is not sensitive to the external disturbances. The simulation experiment of this algorithm is processed based on the MATLAB environment. The simulation results show that this algorithm can weaken the vibration and suppress the random disturbance. This method can be used in the disk drive servo system to significantly improve the dynamic performance as well as it can enhance the stability and control accuracy of the system.

Key words: exponential approach law；disk drive system；sliding mode control；Kalman filter