The dynamic characteristics of frame structure of high-speed dynamic balancing machine directly affects the accuracy of the dynamic balance test. In order to improve the vibration characteristic of frame structure of dynamic balancing machine, how the stiffness of the main stiffness rod influences the dynamic stiffness of the machine was investigated. First, the frame structure model of the high-speed dynamic balancing machine was established using finite element analysis software ANSYS and the modal analysis was carried on it. The natural frequency and vibration mode of the frame structure were obtained, removing vibration modes which have no influence on balancing machine. Modal analysis was carried out on different frame structure and the results were compared, aiming to remove structure which had no influence on natural frequency of frame structure. Then, in the simplified model, the dynamic stiffness of five improved models were calculated. The results show that the appropriately changes in the structure size or the material properties of the main stiffness rod will change the dynamic stiffness of the frame structure. In the design process, we can change the structure size or the properties of the main stiffness rod to meet the design requirements. This method has good engineering practice value, and provides analysis method and improvement reference for engineering application.%高速动平衡机摆架的动力学特性直接影响到动平衡试验的准确性.为了改善动平衡机摆架的动力学特性,分析了动主刚度杆对平衡机摆架动刚度的影响.首先,使用有限元分析软件ANSYS建立高速动平衡机摆架模型,对其进行模态分析,得到动平衡机摆架的各阶频率和振型,除去对动平衡机摆架工作无影响的固有振型.对不同结构的摆架进行模态分析,比较计算结构,除去对动平衡机摆架固有频率没影响的结构.其次,在简化模型的基础上,提出摆架主刚度杆的5种改进方法.分别对各种改进之后的摆架进行谐响应分析,得到动刚度与频率关系曲线.结果表明,适当改变主刚度杆的结构尺寸或材料特性,都会改变摆架的动刚度.因此,在设计的过程中,可以通过适当改变主刚度杆的结构尺寸和材料特性来满足动平衡机摆架的设计要求.此方法具有较好的工程实际价值,为工程应用提供分析方法和改进参考.
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