汽轮发电机组转子不对中振动特性分析与诊断

发布时间：2018-02-09 07:06

本文关键词： 汽轮发电机组联轴器不对中轴承不对中故障征兆故障诊断　出处：《华北电力大学（北京）》2011年硕士论文　论文类型：学位论文

【摘要】：转子不对中是汽轮发电机组轴系在启机和运行中典型故障之一,联轴器不对中和轴承不对中是不对中的两种形式。为了确保机组的安全稳定运行,本文以汽轮发电机组轴系为对象,研究了转子不对中的振动特性和诊断方法。本文对目前机组普遍使用的的齿式联轴器和刚性联轴器联接的轴承—转子系统在不对中状况下的振动机理进行了研究,分析了相应的振动特性。研究了不对中转子的运动规律,建立了转子不对中的数学模型,推导了不对中转子的动力学方程。从而得出了故障的典型特征。对大量的现场汽轮发电机组转子不对中案例进行了分析,将转子不对中按照故障形式、产生原因、发生部位进行了分类分析。进一步分析了故障发生时对机组安全性、经济性和可靠性的影响。采用FTA研究方法对故障产生的原因和对应的处理措施进行了详细的论述,得出了每种不对中形式的FTA故障原因查找流程图。利用故障典型的监测参数、故障特征、产生原因等相结合的方法对联轴器不对中和轴承不对中进行了故障诊断的研究,制定了诊断方法和流程。最后利用该诊断方法对现场振动事故进行了诊断,得出了准确的结果,并给出了相应的处理措施和指导意见。该方法对于汽轮发电机组转子不对中的诊断和处理具有重要的指导意义。
[Abstract]:Rotor misalignment is one of the typical faults of turbine-generator shafting in start-up and operation, and the misalignment of shaft coupling and bearing is two types of misalignment. In order to ensure the safe and stable operation of the unit, the rotor misalignment is one of the typical faults in the shaft system of the turbine generator set. In this paper, the vibration characteristics and diagnosis methods of rotor misalignment are studied. In this paper, the vibration mechanism of the bearing-rotor system with gear coupling and rigid coupling, which is widely used at present, is studied under the condition of misalignment. The corresponding vibration characteristics are analyzed, the motion law of the misaligned rotor is studied, the mathematical model of the misalignment of the rotor is established, the dynamic equation of the misaligned rotor is derived, and the typical characteristics of the fault are obtained. In this paper, a large number of cases of rotor misalignment of turbine-generator sets are analyzed. The causes and location of rotor misalignment are classified and analyzed according to the fault form, and the safety of the unit when the fault occurs is further analyzed. The effect of economy and reliability. The causes of failure and the corresponding treatment measures are discussed in detail by using FTA research method, and the flow chart of finding out the causes of each kind of mismatched FTA fault is obtained, and the typical monitoring parameters of the faults are used. The fault diagnosis method of coupling and bearing misalignment is studied, and the diagnosis method and flow chart are worked out. Finally, the field vibration accident is diagnosed by using this method. The accurate results are obtained and the corresponding treatment measures and guidance are given. This method has important guiding significance for the diagnosis and treatment of rotor misalignment of turbogenerator sets.
【学位授予单位】：华北电力大学（北京）
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TM311;TH165.3

【参考文献】