一种基于电磁—空气弹簧的非线性隔振器理论与实验研究

本文提出一种主要由空气弹簧和永磁体所组成的具有准零刚度特性的非线性隔振器.首先,通过分析空气弹簧和磁体的受力特性,建立隔振器力-位移关系和刚度-位移关系,揭示隔振器静态力学特性,并分析隔振器参数对系统刚度的影响规律.然后,采用谐波平衡法计算隔振器力传递率特性.结果表明,通过在适当范围内调节系统阻尼比或激励幅值,所提出的非线性隔振器在隔振频率范围内优于普通空气弹簧隔振器.最后,通过实验验证隔振器的隔振性能.该研究可为小振幅甚至微振动系统的振动隔离提供新的参考.

Theoretical and Experimental Study of a Nonlinear Vibration Isolator Based on Air Spring and Magnet

A novel quasi-zero stiffness vibration isolator is presented and tested in this article. The isolator is mainly made of air spring and permanent magnet. The stiffness effect between them is mutually restrained to form a quasi-zero stiffness state. Firstly, the force-displacement relationship and the stiffness-displacement relationship of the isolator is established to reveal the static characteristics. The influences of isolator parameters on the system stiffness are also analyzed. Then, the dynamic transmissibility characteristics are calculated by the harmonic balance method. The results shows that the proposed quasi-zero stiffness isolator is superior to the normal air spring isolator over the isolation frequency range by regulating the damping radio or excitation amplitude in a suitable range. Finally, the dynamic experiments is employed to verify the vibration isolation performance. This research provides a new reference for small amplitude or even micro-vibration isolation.