PERFORMANCE EVALUATION OF THE QUASI SLIDING-BASED SLIDING MODE CONTROL IN THE MASS SPRING DAMPER SYSTEM

Abstract

Sliding mode control (SMC) is an effective control method with the robust stability, quickly response even under conditions of disturbance and changing of object’s parameters. However, the discontinuity of the signum function in the SMC law can cause the chattering in the control signal. Improving quality of the SMC has been interested and published by many researchers. However, the overall evaluation of the SMC's effectiveness and comparison with other modern control techniques is still limited. This paper presents testing results of the Quasi-sliding mode – based SMC and compares the effectiveness of that method with the back-stepping controller, multi-objective genetic algorithm tuned PID and traditional PID. That testing method is applied to control the position of the mass spring damper system. The simulation results in MATLAB/Simulink show that the testing method is efficient. The quality indicators achieved by the Quasi-sliding mode – based SMC are better than other control techniques. The position response of the mass spring damper system in simulation model converges to reach the reference without overshoot, the setting time is about 0.26 (s), and the steady-state error is eliminated.