3 . the program for calculating and analyzing turbogenerators " steady characteristics has been compiled and devised . 1 ) taking the stator and rotor ' s practical dimensions and configuration into account , more grids used in the grid division , < wp = 4 > so the results will more reliable and with high precision 3 .在已有的非线性有限元方程求解方法的基础之上，利用现有的计算条件，本文计算了若干典型工况的磁场分布，并对这些计算结果进行了分析，研究了非线性有限元方程的计算精度问题。
By the data observed on - site , it indicate that the reinforcing plan which the plant to disembark and the dam to be connected has solved the problem that the plant to disembark occurs resonance vibration with the frequency of the turbogenerator units , but the problem of resonance vibration of the downriver structure of the plant has not been solved , hence the study of the reinforce structure of the downriver plant must be made 厂房在此长期严重的振动下，立柱出现水平周边裂缝，门窗墙壁也均产生裂缝，威胁到电站的安全运行。现场测试表明上游厂坝间在一定范围内连接加固，虽然解决了厂房上游一阶频率与转频的共振问题，但对下游结构作用不明显，因此需要对厂房下游结构的加固作进一步的研究。
In large rotating machinery using filmatic bearing ( turbogenerator , air compressor , etc . ) there is a potential trouble from impefect installation or running conditions , a metals " contact between rotors and shells . the trouble is usully called rubbing . the advantage of ae technologe in the rubbing diagnosis and early detection is showed . instead of classical ae characteristic parameters ( counts , amplitude , energy , duration and the other ones ) a new feature extraction by frequency analysis of ae envelop signals is discussed . both research of ae process and field experements indicate that periodic components in the envelop spectrum related to rotational speed increase evidently at the beginning of rubbing production , hence are highly sensitive to the rubbing fault diagnosis . according to the new design an acoustic emission equipment for the rubbing diagnosis named buaa ae testing system is developed and described 汽轮发电机、空气压缩机等采用油膜支撑的大型转动机械，由于安装或运行中的原因，在转子旋转过程中，可能和器壁发生轻微的摩擦和碰击，简称碰摩.声发射技术在碰摩发生特别是故障早期诊断上有优越性.本系统的特点是没有沿用传统的计数、幅度、能量和持续时间等声发射特性参数，而是在声发射包络信号的频率分析中进行特征提取.声发射发生的过程分析和现场试验都表明这种方法对碰摩检测很敏感，在碰摩发生的起始阶段，包络谱中与转速同步的周期性分量显著增加.根据这种新的设计思想自行研制了buaa碰摩声发射检测仪并对此作了介绍
This dissertation contains seven chapters concerned mainly with the theory and methodology of fault diagnosis for rotating machinery such as turbogenerator . a fault diagnosis system used in power plant has been develpoed . several key technique in fault diagnosis system have been further studied 本文以汽轮发电机组为研究对象，以发展和完善旋转机械类故障诊断方法为目的，结合工程背景开发了实用的故障诊断系统，针对故障诊断系统中的几个关键技术问题进行了深入研究。
