正负刚度并联机构动力学分析及隔振仿真

正负刚度并联，可使系统的总刚度在平衡点附近趋近于零，从而有效降低系统的固有频率，实现超低频隔振。文中对一种正负刚度并联机构进行了分析，建立了其非线性动力学模型，采用谐波平衡法进行近似求解，并与数值方法求解进行比较，证明谐波平衡法对于该非线性系统的求解足够精确。文中还对该系统隔振效果进行了仿真，证明采用正负刚度并联的机构可以实现超低频的微幅精密隔振。

The Dynamic Analysis and Simulation of Positive and Negative Stiffness in Parallel

By combining the positive stiffness and negative stiffness in parallel, the stiffness of the system tends to zero nearby the balanced point.A type of positive stiffness and negative stiffness parallel connection mechanism is analysed, and the nonlinear dynamics model of the system is buih. Then the paper uses harmonic balance method to approximately solve the equation, compares the solution with numerical solution to prove that the harmonic solution is precision for this nonlinear system, then uses the simulation to test the vibration isolation effect, the simulation result proved that the positive stiffness and negative stiffness parallel mechanism has good effect on ultralow frequency micro amplitude vibration isolation.