论文部分内容阅读
对汽轮机叶片—叶轮系统（轮系）耦合振动特性进行了理论和实验研究。首先介绍了一种简便实用的计算轮系振动特性的数值积分方法。此方法考虑了叶片的剪切变形、转动惯量、叶轮轮孔处支承柔度、叶片和叶轮连接处的叶根柔度及离心力等影响轮系振动的各种主要因素，给出了焊拉筋和松拉筋的处理方法，可供计算各种结构轮系振动的静、动频谱和相应的振型。其次，本文利用锤击法对叶片—叶轮系统模型进行了模态分析和参数识别，得到系统各阶固有频率和振型，理论计算结果与实验值的比较较为吻合。
The coupling vibration characteristics of steam turbine blade-impeller system (gear train) are studied theoretically and experimentally. First of all, a simple and practical numerical integration method for calculating the vibration characteristics of a gear train is introduced. This method takes into account various factors that affect the vibration of the gear train, such as the shear deformation, the moment of inertia, the bearing flexibility of the impeller wheel hole, the flexibility of the root of the blade at the impeller connection and the centrifugal force, And slackening tendons processing methods for calculating the static and dynamic frequency spectrum and the corresponding mode shapes of various structural wheel series vibration. Secondly, modal analysis and parameter identification of the blade-impeller system model are made by hammering method, and the natural frequencies and mode shapes of the system are obtained. The theoretical calculation results are in good agreement with the experimental values.