多模态双层隔振系统多输入输出耦合反馈振动控制研究

Study on the MIMO Coupling Feedback Vibration Control of the Multiple Modes Double Stage VIS

建立了双层隔振系统多输入输出反馈振动控制模型,研究了在双反馈控制作用下,隔振系统的力传递率特征.分析了反馈环节中控制力、耦合系数,以及作动器位置振动速度之间的关系,并研究了作动器之间的互相耦合对系统稳定性和力传递效果的影响.通过Nyquist稳定性分析,得到了系统在不同参数条件下的稳定性及随参数变化的规律.仿真结果表明,多反馈控制过程中系统具有鲁棒性,耦合系数的增加使振动隔离能力更好.

The multiple input multiple output(MIMO)coupling feedback of two stage vibration isolation system(VIS)is presented.The force transmissibility characteristic of the system is analyzed by double feedback control strategy and the relationship among the secondary force,coupling coefficient,and vibration velocity is disclosed.Then,the effects of the coupling coefficient on the stability and transmissibility are researched.The stability and the corresponding variation law under different parameters are discussed.Results show that the coupling system is robust and increasing the coupling coefficients improves the vibration isolation performance.