一种含放大机构隔振器的动力学特性研究

利用四端铰接杆，提出一种含放大机构的新型隔振器.采用谐波平衡法获得隔振系统动态响应的解析表达式，并分别给出隔振系统的幅频响应、相频响应、绝对位移传递率、等效刚度系数和等效阻尼系数.理论计算结果与常规线性隔振器进行对比，并开展了验证试验.分析并给出系统参数对含放大机构隔振系统动态性能的影响规律.结果表明:与常规线性隔振器相比，在时域范围多频激励条件下含放大机构隔振系统惯性质量的绝对位移传递率幅值得到明显衰减；同样，在频域范围惯性质量的绝对位移传递率幅值也得到显著衰减，且谐振频率略微向高频移动；隔振系统设计参数对隔振性能均有较大影响，通过灵活调整隔振系统各设计参数可以实现不同的隔振目标. 

Dynamic Characteristics of a Type of Vibration Isolator with Amplifying Mechanism

A new type of vibration isolator with amplifying mechanism was proposed by using a four-end articulated rod. Firstly, the analytical expression of the dynamic response of the vibration isolation system was obtained based on the harmonic balance method, and some parameters were got respectively, including the amplitude-frequency response, phase-frequency response, absolute displacement transmission rate, equivalent stiffness coefficient and equivalent damping coefficient of the vibration isolation system. The theoretical calculation results of the vibration isolation effect in the time domain and the frequency domain were compared with the conventional linear vibration isolator, and the verification test was carried out. Finally, the influence of system parameters on the dynamic performance of the vibration isolation system with amplification mechanism was analyzed, getting the influence mechanism. The results show that compared with the conventional linear isolators, the amplitude of the absolute displacement transfer rate of the inertial mass can be significantly attenuated by the vibration isolator with the amplification mechanism under the multi-frequency excitation in the time domain. Similarly, in the frequency domain, the amplitude of the absolute displacement transmission rate of the inertial mass can also be significantly attenuated, and the resonant frequency shifts slightly to the high frequency. The design parameters of the vibration isolation system have a great influence on the vibration isolation performance, and different vibration isolation targets can be realized by flexibly adjusting the design parameters of the vibration isolation system.