二重滚珠式动力吸振器的参数设计

Parameter Design of Double Ball Dynamic Vibration Absorber

为了降低机械或结构的强迫响应,尤其是适应现代化结构复杂的大型机械或建筑物的共振,设计了一种结构较为简单、便于运用的二重滚珠式动力吸振器。基于拉格朗日方程建立了二重滚珠式吸振器的动力学模型,通过解析与数值计算,研究了该吸振器的振动机理及各主要参数对其吸振效果的影响。利用吸振器定点定理进行优化设计,分析了三定点的坐标特点,求解出了最优频率及阻尼。研究表明,此吸振器可有效控制机械或结构共振点附近的振动响应。

In order to reduce the forced response of machinery or structure,especially to the resonance of large machinery or buildings with complex modern structure,a dual ball dynamic vibration absorber with simple structure and easy operation is designed. Based on the Lagrange equation,the dynamic model of the double ball type vibration absorber is established. The vibration mechanism of the vibration absorber and the influence of the main parameters on its vibration absorption effect are studied by the analysis and numerical calculation. By using the fixed-point theorem,the coordinate characteristics of three fixed points are analyzed,and the optimal frequency and damping are obtained. The research shows that the vibration absorber can effectively control the vibration response near the resonance point of the machine or structure.