移动凸轮变阻尼隔振装置动态性能研究

Dynamic performance of translating cam variable damping vibration isolation device

针对线性隔振器在共振区需要大阻尼才能抑制共振峰,但在高频区大阻尼不利于隔振的问题,提出了基于移动凸轮的变阻尼隔振装置,该装置主要由水平对称布置的线性阻尼器及移动凸轮组成。将该变阻尼装置用于消极隔振系统,推导了变阻尼装置的等效阻尼系数,建立了隔振系统的动力学方程,采用谐波平衡法得到了方程的近似解析解;通过盛金法及数值仿真得到了其位移传递率曲线,分析了主要参数对系统隔振性能的影响。与传统的线性隔振器相比,选取合适的设计参数的变阻尼隔振系统,能更有效地抑制共振峰,同时还可以在中、高频区取得很好的隔振效果,最后以车辆为例,验证了前述结论。

Here,aiming at the problem of linear vibration isolator requiring large damping in resonance region to suppress resonance peaks but large damping in high-frequency region being not conducive to vibration isolation,a variable damping vibration isolation device based on translating cam was proposed.The device was mainly composed of horizontally symmetrically arranged linear dampers and translating cams.This variable damping device was applied in a passive vibration isolation system,and the equivalent damping coefficient of the variable damping device was derived.The dynamic equation of the vibration isolation system was established,and the approximate analytical solution to the equation was obtained using the harmonic balance method.The system’s displacement transmissibility curve was obtained using Sheng Jin method and numerical simulation,and effects of main parameters on the system’s vibration isolation performance were analyzed.It was shown that compared with traditional linear vibration isolator,a variable damping vibration isolation system with appropriate design parameters can more effectively suppress resonance peaks,and achieve very good vibration isolation effect in medium and high frequency regions.Finally,taking a vehicle as an example,the above conclusion was verified.