考虑模型形式误差的转子动力学修正及确认

发布时间：2018-06-13 02:54

  本文选题：模型修正 + 模型形式误差　； 参考：《振动.测试与诊断》2017年02期

【摘要】：研究考虑模型形式误差的轴承-转子系统工作转速下的动力学模型修正和确认方法。首先,介绍了模型形式误差以及基于复模态特征值灵敏度的模型修正理论;然后,在此基础上以轴承-柔性转子系统为仿真算例,考虑模型形式误差,使用系统在恒定工作转速下的涡动频率和阻尼参数,同时对轴承的支承刚度、支承阻尼和转盘的直径转动惯量参数进行修正;最后,通过不平衡响应结果对修正模型进行了确认。仿真结果显示,考虑模型形式误差时的修正参数最大误差仍有-10.1%,而修正后特征值实部最大误差为0.95%,特征值虚部最大误差为-1.15%,修正后不平衡响应与目标模型基本重合。研究表明,考虑模型形式误差时轴承-转子系统的修正方法是稳健的,也是有效可行的。
[Abstract]:The dynamic model modification and confirmation method of bearing-rotor system at working speed considering the model form error is studied. First, the model form error and the model correction theory based on complex modal eigenvalue sensitivity are introduced, and then, taking the bearing-flexible rotor system as a simulation example, the model form error is considered. Using the eddy frequency and damping parameters of the system at constant working speed, the bearing stiffness, the bearing damping and the diameter rotational inertia parameters of the turntable are modified. The modified model is confirmed by unbalanced response results. The simulation results show that the maximum error of the modified parameter is still -10.1 when the model form error is considered, but the maximum error of the real part of the modified eigenvalue is 0.95. the maximum error of the imaginary part of the eigenvalue is -1.15. the modified unbalance response basically coincides with the target model. The results show that the method is robust and feasible when considering the model form error.
【作者单位】： 厦门大学航空航天学院;南京航空航天大学机电学院;
【基金】：国家自然科学基金资助项目(51505398,U1530122,51275240) 航空科学基金资助项目(20150968003)
【分类号】：TH113
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本文编号：2012369