Study on the Application of H-Infinity Control to Double-Layer Vibration Isolation System

Double-layer vibration isolation device can significantly reduce the vibration of machinery and equipment delivered to the base or the environment. However, the passive approach is difficult to isolate the low-frequency vibration effectively. Active vibration isolation technology can set the control law according to the adjustment of dynamic characteristics parameters of the system, realize isolation requirements that passive isolation can not reach; In this paper, mixed sensitivity design method is applied, the performance weighting function and robust weighting function are reasonably chosen, the problem of robust feedback controller design translate to solve a standard H_∞ control problem. The simulation results of frequency-domain show that isolation system can achieve good vibration isolation effect at the specified frequency band and the H_∞ H_∞Robust control algorithm can effectively improve the isolation performance of double-layer vibration isolation system.