复合材料薄壁轴转子系统动力学特性的有限元分析

摘要

采用有限元软件ANSYS建立了复合材料薄壁轴的有限元模型，通过模态分析得到系统的固有频率和临界转速，将结果与相关文献的结果进行比较，说明了模型的正确性。然后建立了包含轴承、转盘在内的复合材料薄壁轴转子系统的有限元模型，研究了转子系统的动力学特性。讨论了复合材料铺层角度、铺层顺序、长径比、轴承刚度和转盘安装位置等因素对转子系统固有频率和临界转速的影响，随后分析了转盘质量、转盘安装位置、轴承刚度和轴承阻尼对转子系统不平衡响应的影响。该分析方法为复合材料薄壁轴转子系统的动力学研究与设计，提供一种可供选择的分析方法。%A finite element model was first established for a composite thin‐walled shaft system by using the finite ele‐ment software ANSYS .Through modal analysis ,the natural frequency and the critical speeds were obtained and by comparing the results with those in other related literature ,the validity of this model was proved .Then a finite ele‐ment model for a composite thin‐walled shaft rotor system which includes bearing and rigid disk was established to study the dynamic characteristics of the rotor system .The effects of the composite fiber orientation ,fiber stacking sequence ,ratios of length over radius ,bearing stiffness and disc installation position in the shaft on the natural fre‐quency and the critical speeds were discussed .Afterwards ,the effects of disk mass ,disc installation position ,bearing stiffness and bearing damping on the imbalance response of the rotor system were analyzed .This method provides an alternative analytical method for the study and design of the composite thin‐walled shaft‐rotor system .