透平机械转子系统不对中故障定量诊断监测方法研究

针对透平机械转子系统不对中故障程度难以定量诊断的问题，提出一种基于转子的状态监测数据建立转子平行不对中量与节点振动通频幅值的关系曲线来定量诊断转子平行不对中故障的方法。对平行不对中状态下的转子进行受力分析得到转子不对中激励力，通过建立的转子试验台有限元数值分析模型计算得到不同不对中激励力下的转子节点振动通频幅值，进而通过分析转子节点振动通频幅值与不对中量的对应关系曲线及转子运行正常数据对关系曲线进行修正；根据监测得到的转子节点振动通频幅值反推出转子平行不对中量，达到对平行不对中故障定量诊断的目的。最后试验验证了定量诊断方法的可行性。

A method for quantitative diagnosis and monitoring of rotor misalignment faults in turbine machinery

It is difficult to diagnose quantitatively the degree of misalignment in a turbine rotor system. A quantitative method for diagnosis of parallel misalignment based on monitoring data, utilizing the relationship between the misalignment of the rotor and the vibration amplitude of the node, is proposed in this work. The steps involved in the method are as follows. The rotor misalignment force is obtained by analyzing the state of the parallel misalignment rotor. A rotor model is then established to analyze the variation of rotor node vibration for different misalignments based on dynamics theory. The relationship between the vibration amplitude of the node with the misalignment is then analyzed, and modified according to the data obtained with the normal operation of the rotor. By monitoring the vibration amplitude of the node, the parallel misalignment of the rotor can be derived, and the aim of diagnosing the faults in the parallel misalignment is thus achieved. Using a test rig, the vibration of the rotor with different misalignments was analyzed by experiment. The experimental results show that the proposed method of monitoring and assessment is valid.