基于耦合源误差分析的转子振动信号识别方法

转子振动信号实时监测是保障旋转机械健康运行的关键，转子圆度误差和电涡流位移传感器误差的耦合源误差在以往的研究和振动监测中很少考虑，使得转子振动信号有一定的失真，甚至会引起误判。以实际转子为例，提出了圆度误差测量表达式；测量和分析了两种常用电涡流位移传感器的误差，利用傅里叶拟合方法构建了圆度误差和电涡流位移传感器耦合源误差表达式，建立了耦合源误差与转子振动信号之间的映射关系。提出了点-点法、平均值法与最大值法3种转子振动信号识别方法，3种方法都能有效识别转子振动信号，其中点-点法最精确，识别误差占比约20%;平均值法计算简便，识别误差占比约10%;最大值法偏保守，但可有效避免误判，识别误差占比约32%。

Rotor vibration signal recognition method based on coupling source error analysis

Real-time monitoring of the rotor vibration signal is a key to ensure rotating machinery running steadily. The coupling source error of rotor roundness error and eddy current displacement sensor error is rarely considered in previous research and vibration monitoring, which causes distortion of the rotor vibration signal, and even causes misjudgment. Taking an actual rotor as an example, a measurement expression of the roundness error is proposed. The errors of two common eddy current displacement sensors are measured and analyzed. The expression of source error which is coupled by roundness error and eddy current displacement sensor error is constructed by Fourier fitting. The mapping relationship between coupling source error and rotor vibration signal is established. Three rotor vibration signal recognition methods are proposed, including the point-point method, the average value method and the max value method. All three methods can effectively recognize the rotor vibration signal. The point-point method is the most accurate, and its recognize error accounts for about 20% . The average value method is simple to calculate, and its recognize error accounts for about 10% . The maximum value method is conservative. However, it helps to effectively avoid misjudgment and its recognize error accounts for about 32% .