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针对现代航空涡扇发动机转子系统的结构和力学特征,运用有限元法对其低压转子进行了有限元建模方法和动力特性研究.分别采用二维梁单元和三维实体单元建立转子系统的有限元模型,对其动力特性计算结果进行比较分析,在此基础上,提出了等效圆盘法进行有限元建模的等效原则.等效圆盘法将转子系统的叶片等效为刚性圆环,既能保留转子系统的结构和力学特征,又能有效地控制模型规模,将周期问题转化为轴对称问题,便于有限元程序的求解计算.计算结果表明,该方法是一种适用工程实际的有限元建模方法.
Aiming at the structure and mechanics characteristics of the rotor system of modern aviation turbofan engine, the finite element method and the dynamic characteristics of the rotor system of the low-pressure turbine are studied by means of the finite element method.The finite element method of the rotor system is established by using the two-dimensional beam element and the three- Model, the dynamic characteristics of the comparative analysis of the results, based on the proposed equivalent disk method for the finite element modeling equivalent principle equivalent disk method of the rotor system is equivalent to a rigid ring , Which not only retains the structure and mechanical characteristics of the rotor system but also effectively controls the scale of the model and transforms the periodic problem into the axisymmetric problem so as to facilitate the calculation of the finite element program.The calculation results show that the method is a practical engineering Finite element modeling method.