三维实体转子系统热-结构耦合响应分析

以某型航空发动机高压转子系统为研究对象,基于不均匀分布稳态温度场,建立了某高压转子系统三维实体单元有限元模型以及稳态温度场下转子系统热-结构耦合振动方程,利用热-结构-动力学耦合理论,采用间接耦合法,通过稳态温度场分析和静力分析生成热应力,然后进行预应力模态分析,最后利用模态叠加法进行不平衡量和热弯曲耦合响应分析,实现热-结构-动力学耦合计算.通过稳态温度场对典型级盘稳态响应影响的分析以及不平衡量与热弯曲耦合稳态响应分析,发现耦合响应对转子系统各级盘的振动响应有较大影响.

Analysis of Thermal-structural Coupling Response of 3D Solid Rotor System

With the high pressure rotor system of an aero engine as the object of study, in the context of uneven radial distribution of steady state temperature field, this paper establishes FEM model of 3D solid elements of a high pressure rotor system and vibration equation of thermal structural coupling model of 3D solid rotor system in the steady state temperature field, it first makes an analysis of the steady state temperature field by indirect coupling method using thermal structural dynamic coupling theory, and then makes a static analysis to generate thermal stress, and then generates global stiffness matrix by setting prestress option to make a modal analysis, and finally makes an analysis of coupling response of unbalance and thermal bending by modal superposition method to realize thermal structural dynamic coupling computation. Through the analysis of the effect of steady state temperature field on steady state response of typical stage discs and analysis of steady state response of coupling of unbalance and thermal bending, this paper finds coupling response has a big effect on vibration response of different stage discs of the rotor system.