基于ADAMS的非线性隔振系统吸引子迁移仿真研究

Research of the attractor migration simulation for nonlinear vibration isolation system based on ADAMS software

针对非线性隔振系统多值性导致系统存在多个不同拓扑特性的吸引子,通过ADAMS软件对非线性隔振系统吸引子迁移控制进行了仿真。首先,分别推导单自由度和两自由度非线性隔振系统的吸引子迁移控制规律;其次,以准零刚度隔振系统为对象,分析其静力学特性并确定系统参数;最后,分别建立刚性基础和柔性基础准零刚度隔振系统的ADAMS模型,基于开环加线性闭环算法进行吸引子迁移控制仿真。仿真结果证明了吸引子共存现象是真实存在的,并可通过开环加线性闭环算法使非线性隔振系统由大振幅吸引子迁移至小振幅吸引子,从而实现减振降噪。

Aiming at the multi-value character of the nonlinear vibration isolation system leading to the coexistent attractors with different topological properties, the attractor migration control of the nonlinear vibration isolation system is simulated by ADAMS software. Firstly, the attractor migration control regulation of the nonlinear vibration isolation system with single degree-of-freedom and two degrees-of-freedom are established, respectively.Secondly, the static characteristics of the quasi-zero-stiffness(QZS) vibration isolation system are analyzed and the systematic parameters are determined. Finally, ADAMS models of the QZS vibration isolation system for rigid base and flexible base are established, respectively. Attractor migration control simulation is carried out based on open-plus-closed-loop(OPCL) algorithm. The simulation results show that the coexistent attractors are real in engineering practice, and the nonlinear vibration isolation system can be migrated from large amplitude attractors to small amplitude attractors by using OPCL method, so as to reduce vibration and noise.