弹性环式支承结构动刚度分析及其对转子系统的影响

针对用于航空发动机转子系统中的弹性环式支承结构刚度特性问题，开展其动刚度分析和实验测试以及其对转子系统固有特性影响分析研究.首先，建立弹性环式支承结构有限元模型，对其动刚度进行计算，并进行动刚度测试与验证，经实验所得测试结果与仿真计算的结果趋势一致，证明了对弹性环式支承结构的动刚度分析方法的有效性.然后，建立了带弹性环式支承结构的转子系统有限元模型，研究了转子系统在静刚度和动刚度条件下对临界转速的影响.结果表明，弹性环式支承结构动刚度对临界转速的影响较为明显，其中一阶临界转速降低了26%，且产生了新的共振频率，因此分析转子系统固有特性时应充分考虑支承结构的动刚度影响.

Analysis of Dynamic Stiffness of the Elastic Ring Support Structure and Its Influence on the Rotor System

Aiming at the stiffness characteristics of the elastic ring support structure used in the aero-engine rotor system， the dynamic stiffness analysis and experimental tests as well as the analysis of its influence on the natural characteristics of the rotor system are carried out. First， a finite element model of the elastic ring support structure is established to calculate its dynamic stiffness， then the dynamic stiffness testing and verification is conducted. The experimental test results are basically consistent with the simulation results， which verify the correctness of the finite element analysis method of the elastic ring structure. Then， a finite element model is built which includes the rotor system and the elastic ring structure. Besides， the influence of the rotor system on the critical speed under the conditions of static and dynamic stiffness is studied. The results show that the dynamic stiffness of the elastic ring support structure has a significant impact on the critical speed. The first-order critical speed is reduced by 26%， and a new resonance frequency is generated. Therefore， the dynamic stiffness of the support structure should be fully considered when analyzing the natural characteristics of the rotor system.