Design and Implementation of Permanent and Electromagnet Composite Vibration Isolation System Based on Negative Stiffness Theory

In order to decrease the transmission of vibration and achieve attenuation magnitude an isolated object, a new type permanent electromagnet composite isolation system is designed based on negative stiffness theory. Firstly, according characteristic analysis, design hybrid actuator accomplished; secondly, model established, active control strategy fuzzy PID algorithm designed. Finally, test platform built verify effect. The results indicate that developed renders sharp external in multiple frequency bands. When within range 20 Hz 100 Hz, greater than 80%; when 500 rate 90%.