To isolate low-frequency vibration, a novel single-degree-of-freedom vibration isolation system with quasi-zero stiffness (QZS) and nonlinear damping using geometric nonlinearity is proposed in this study. One of the remarkable features of this system is the use of scissor-like structures (SLSs) to achieve the nonlinear stiffness and damping. The length difference between the connecting rods in SLS is considered. First, both the stiffness and damping characteristics are derived and analyzed in detail. Then, the frequency response and force transmissibility are obtained using the harmonic balance method. Finally, the effects of structural parameters on the isolation performance are investigated. Theoretical results show that the proposed QZS vibration system can not only isolate low-frequency vibration but also suppress the high-amplitude vibration in the resonant region. Besides, increasing nonlinear damping has little influence on the isolation performance in high frequencies. The proposed QZS vibration system can outperform a classical counterpart.

为了隔离低频振动，提出了一种新颖的具有准零刚度（QZS）和非线性阻尼的单自由度振动隔离系统，该系统使用几何非线性。该系统的显着特征之一是使用剪刀状结构（SLSs）来实现非线性刚度和阻尼。考虑了SLS中连杆之间的长度差。首先，详细推导并分析了刚度和阻尼特性。然后，使用谐波平衡法获得频率响应和力传递率。最后，研究了结构参数对隔离性能的影响。理论结果表明，提出的QZS振动系统不仅可以隔离低频振动，而且可以抑制共振区的高振幅振动。此外，增加非线性阻尼对高频的隔离性能影响很小。拟议的QZS振动系统可以胜过传统的振动系统。