压气机动应力测试的叶-盘耦合分析方法

为评估发动机压气机转子叶片的振动特性和工作可靠性，基于循环对称结构模态分析基本理论，建立了大叶片在轮盘装配条件下的耦合振动特性分析方法。以压气机某级为研究对象通过循环对称建立叶-盘耦合结构有限元模型，得到叶-盘系统在静态和工作转速下的模态及应力分布，并通过与实验结果的对比验证了该方法的可靠性。利用Campbell图确定了叶片的危险转速，并评估特定转速下系统频率裕度，为压气机工作叶片动应力测量提供数值仿真技术支撑。

A blade-disc coupling analysis method for dynamic stress test of compressor

Based on the modal analysis theory of cyclic symmetric structure, the method for analyzing coupled vibration characteristics of large blades under the wheel assembly condition was established to evaluate the vibration characteristics and working reliability of the compressor rotor blades. A compressor stage was selected as the research object and the finite element model of blade-disc coupling structure was established by cyclic symmetry. The modal and stress distribution of the blade-disc system under static and working speeds were obtained. The reliability of the proposed method was verified by comparing with the experimental results. The dangerous rotational speed of the blade is determined using Campbell diagram, and the frequency margin of the system is evaluated at specific rotational speed, which provided numerical simulation technology support for the dynamic stress measurement of the compressor working blade.