含复杂滚动轴承建模的航空发动机整机振动耦合动力学模型

陈果

doi:10.13224/j.cnki.jasp.2017.09.019

含复杂滚动轴承建模的航空发动机整机振动耦合动力学模型

doi: 10.13224/j.cnki.jasp.2017.09.019

陈果

南京航空航天大学民航学院，南京 211106

基金项目: 国家自然科学基金（51675263）

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出版历程
- 收稿日期: 2015-08-14
- 刊出日期: 2017-09-28

Whole aeroengine vibration coupling dynamics model including modeling of complex ball and roller bearings

摘要

摘要: 在航空发动机整机振动模型中对滚动轴承进行了详细建模。建立了5自由度（DOF）球轴承动力学模型，推导了在5自由度复杂变形下的轴承力和力矩表达式；针对圆柱滚子轴承，利用“切片法”，推导了考虑轴承径向变形、圆柱转子凸度、轴承间隙以及轴承倾斜引起的角向变形等复杂因素作用下的圆柱滚子轴承的作用力；将复杂的球轴承模型和滚子轴承模型与6自由度的转子和机匣有限元梁模型结合，建立了含复杂滚动轴承建模的航空发动机整机振动模型，并利用数值积分方法进行了动力学方程求解。利用带机匣的转子试验器进行了方法验证，与试验结果对比表明，仿真计算的整机振动前3阶固有频率误差在5%以内，对应振型完全相似。
- 航空发动机 /
- 整机振动 /
- 滚动轴承 /
- 动力学建模 /
- 耦合动力学
Abstract: The ball and roller bearings were modeled in detail in whole aeroengine vibration model. The 5 DOF (degrees of freedom) model of ball bearing was established, and the bearing forces and moments were deduced under complex deformations of 5DOF. The cylindrical roller bearing was modeled by means of the “section method”, and the bearing force and moments were deduced considering the radial deformation, degree of convexity of cylindrical roller, bearing clearance, and angular deformation due to the bearing inclination. The complex bearing models were combined with the rotor and casing finite element beam model with 6 DOF, the whole aeroengine vibration model including modeling of complex ball and roller bearings was established, and the dynamic responses were solved by the numerical integral method. The aeroengine rig with casings was used to verify the correctness and effectiveness of the model. Compared with the experiment results and showed that, the errors of the first 3 orders natural frequencies were less than 5%, and the mode shapes were fully similar.
- aeroengine /
- whole aeroengine vibration /
- ball and roller bearings /
- dynamic modeling /
- coupling dynamics

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