含双频时变滚动轴承刚度的转子-轴承系统响应特征研究

发布时间：2018-07-13 10:24

【摘要】：考虑有限数目滚动体和转子不平衡力引起的滚动轴承刚度的周期时变性,建立了含双频时变滚动轴承刚度的三自由度转子-轴承系统动力学模型。以单频参数激励系统响应的频率分布规律为参照,指出了含双频时变参数的动力学系统其响应的频率构成规律:双频参数激励系统自由响应中出现的频率是系统等效固有频率分别和参数频率的组合,以及等效固有频率同时和两个参数频率的组合;强迫响应中的频率除了包含自由响应中的频率成分之外,还包含外激励频率分别和两个参数频率的组合,以及其同时和两个参数频率的组合。在转子-滚动轴承系统响应中出现的倍频响应、参数频率及其倍频对应的频率成分,可以通过该分析给出合理的解释。该结论有助于更深入地理解多频参数激励系统响应的频域特征,为变参数旋转机械系统故障诊断中的频率成分识别提供了参考。
[Abstract]:Considering the periodic time-variation of the stiffness of rolling bearings caused by the unbalanced forces of a finite number of rolling bodies and rotors, a dynamic model of a three-degree-of-freedom rotor-bearing system with dual frequency time-varying rolling bearing stiffness is established. According to the frequency distribution law of single frequency parameter excitation system, It is pointed out that the frequency composition of the response of the dynamic system with dual frequency time-varying parameters is that the frequency of the free response of the dual frequency parameter excitation system is the combination of the equivalent natural frequency of the system and the frequency of the parameter. The frequency in the forced response includes not only the frequency components in the free response, but also the combination of the external excitation frequency and the frequency of the two parameters. And the combination of the frequency of the two parameters at the same time. The frequency doubling response, the parameter frequency and the frequency components corresponding to the response of the rotor-rolling bearing system can be reasonably explained by this analysis. This conclusion is helpful to a deeper understanding of the frequency domain characteristics of the response of the multi-frequency excitation system and provides a reference for the identification of frequency components in the fault diagnosis of variable-parameter rotating machinery systems.
【作者单位】：中国航空发动机研究院;清华大学机械工程系;
【基金】：国家自然科学基金项目(11602259);国家自然科学基金重点项目(51335006) 北京市自然科学基金重点项目(3131002)
【分类号】：TH133.33

【参考文献】