基于动力学分析的发动机测振截面选取

Modeling method and optimization algorithm of vibration measurement section's selection of the engine was studied. The selection idea of vibration section was determined. The rotor-support-casing whole model was established.The rotordynamic characteristics were calculated under normal and fault conditions. And the section or bearing position of rotor in larger vibration was determined according to the number of sensors which the overall program requires. The initial layout of vibration sensor was completed. An optimization method for vibration measurement was proposed. The effective information of vibration data on each measuring point was determined by analyzing measured data and considering the signal-to-noise ratio and redundancy of measured signal. It was judged that whether the vibration measurement program was reasonable and the airborne measuring point was selected. A engine was taken as an example. The scheme of monitoring points was designed. The study showed that the airborne measuring point was the same as that of the real airborne sensor of the engine. It was verified that the establishment and optimization method and airborne sensor selection method were correct and reliable. The higher the element's sensitivity was, the more significantly the vibration of the rotor was reflected. The lower the vibration similarity was, the more completely the characteristics of engine vibration was reflected. The research result provides an important basis for the layout of vibration measurement of aero-engine.