非光滑准零刚度隔振器实验研究

Experimental investigation of a non-smooth quasi-zero-stiffness isolator

理论上,与传统准零刚度隔振器(QZS)相比,含限位结构的准零刚度隔振器具有更低的位移传递率峰值和更宽的隔振频率范围.但是,目前还没有相关的实验研究证明这一理论结果的正确性.因此,为了研究含限位准零刚度隔振器在实际应用过程中的隔振特性,本文设计制作了相应的结构,并进行了动力学实验.首先,根据赫兹接触理论,建立了含限位结构的准零刚度隔振器(QZS-HCM)动力学模型.然后,对隔振器的结构进行设计和加工,制作了QZS-HCM系统,并对系统进行静力学实验来验证理论结果的正确性.接着,在简谐位移激励下,对QZS-HCM系统进行动力学测试,通过分析系统的位移传递率和时间历程来评价系统的隔振性能.同时,将QZS-HCM系统与传统QZS系统的动力学测试结果进行对比,表明QZS-HCM隔振器在大幅值位移激励下具有更低的位移响应峰值和更宽的隔振频带.

Compared with traditional quasi-zero-stiffness(QZS)isolators,the QZS isolator with displacement constraints can theoretically display a lower transmissibility peak value and a wider isolation-frequency range.Nevertheless,there is no relevant experiment to prove the correctness of this theoretical result at present.In this paper,an experimental structure is built and corresponding dynamic experiments are conducted to explore the isolation characteristics of the QZS structure with displacement constraints during application.Initially,according to Hertz’s contact model,the theoretical framework of a QZS structure with displacement constraints(QZS-HCM)gets developed.Then,the QZS-HCM system is physically realized through the manufacturing and assembly of the structure.The experiments about the force-displacement relationships are conducted to validate the theoretical conclusions.Further,the dynamic experiments about the QZS-HCM system are performed to assess the isolation characteristics by investigating the displacement transmissibility and time history.Compared the experimental results of the traditional QZS structure with those of the QZS-HCM structure,it is observed that the QZS-HCM isolator can demonstrate a lower response peak and achieve a wider isolation-frequency range under the large-amplitude excitation.