Active Control Simulation of Double Layer Vibration Isolation Platform Based on Simulink with Variable Step Size On-line Identification

Secondary channel identification is an important part of FxLMS adaptive active control. The traditional off-line identification has bad mutation ability and bad anti-interference ability for secondary channel. Based on the online modeling method of additional random noise proposed by Eriksson and Allie, an improved variable step size control algorithm is adopted for single channel active control of double vibration isolation platform. In the Simulink control model of double-layer vibration isolation platform is established and verified by simulation for online identification of channel mutation interference and the improved variable step algorithm in convergence speed and identification accuracy advantage.