一种准零刚度隔振器的特性分析与实验研究

Characteristic analysis and experimental investigation for a vibration isolator with quasi-zero stiffness

将五个线性弹簧并联组合,设计出一种具有高静态刚度、低动态刚度的非线性低频隔振器。分析了系统的刚度特性,给出了系统的准零刚度(QZS)条件。利用谐波平衡法分析了系统的动力学特性,得出了系统的力传递率,并分析了阻尼及激励力对系统传递率的影响。为了验证QZS系统的隔振性能,进行了一系列的实验研究。实验结果表明,QZS隔振器的低频隔振性能明显优于相应的线性系统。

Here,a nonlinear low-frequency vibration isolator with 5 linear parallel springs was designed,its stiffness was higher statically and lower dynamically.A unique relationship between the geometry and the stiffness of the system was derived in order to obtain the critical condition of quasi-zero-stiffness （QZS）.Dynamic behavior analysis of a nonlinear QZS system was performed with the harmonic balance method and the force transmissibility of the system was obtained.The effects of damping and excitation force on the system transmissibility were analyzed.To assess the vibration isolation performance of the QZS system,a series of tests were done.The experimental results showed that the lowfrequency vibration-isolation performance of the QZS system is much better than that of the corresponding linear system.