Dynamics Modeling Method of Complex Rotors for Aero-turboshaft Engines

doi:10.3969/j.issn.1004-132X.2022.13.001

Abstract

Abstract: To establish the dynamics model of complex rotor systems in turboshaft engines，the complex structure was modeled by substructure method on the basis of finite element method and piecewise linear fitting. After reducing the degrees of freedom of the systems，motion equations of the rotor systems were derived. The validity of the model was verified by theoretical analysis and experiments，and the vibration characteristics of the gas generator rotors were analyzed. The results show that the established model may significantly reduce the complexity of the overall systems and greatly shorten the calculation time under the premise of ensuring the solution accuracy.

Key words: turboshaft engine, gas generator, rotor, dynamics modeling, finite element method, vibration characteristics

摘要： 为建立涡轮轴发动机复杂转子的动力学模型，基于有限元法和分段线性拟合，采用子结构法对复杂结构进行建模，在对系统自由度进行缩减后，推导出转子系统的运动方程。采用理论分析和试验验证了模型的有效性，分析了燃气发生器转子的振动特性。研究结果表明：建立的模型能显著降低整个系统的复杂度，在保证求解精度前提下，可大幅缩短求解时间。

关键词: 涡轮轴发动机, 燃气发生器, 转子, 动力学建模, 有限元法, 振动特性

CLC Number:

WANG Longkai, WANG Ailun, YIN Yijun, JIN Miao, HENG Xing. Dynamics Modeling Method of Complex Rotors for Aero-turboshaft Engines[J]. China Mechanical Engineering, 2022, 33(13): 1513-1520.

王龙凯, 王艾伦, 尹伊君, 金淼, 衡星. 航空涡轮轴发动机复杂转子的动力学建模方法[J]. 中国机械工程, 2022, 33(13): 1513-1520.

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