基于叶尖间隙测量的航空发动机转子振动预测

Vibration prediction of aero-engine rotor based on tip clearance measurement

基于叶尖间隙测量,进行了航空发动机转子振动位移和轴心轨迹的预测方法研究,建立于叶尖间隙变化动态模型,对叶尖间隙变化进行了数值计算以及有限元仿真,并针对带机匣的转子试验器进行了试验研究。采用电涡流传感器对相互垂直的两个测点进行叶尖间隙测试;通过Hilbert-Huang变换对信号进行处理,提取其低频分量;再利用互相关分析方法提取出转频信号,并由转频分量绘制了轴心轨迹;与直接测得同截面转轴上的轴心轨迹相比,两者的吻合度达到90%以上,试验结果充分表明了研究方法的正确有效性,为通过叶尖间隙测试间接获取转子振动位移提供了有效的技术途径。

Based on the measurement of tip clearance,the prediction method of aeroengine rotor vibration displacement and axis trajectory was studied.Based on the dynamic model of tip clearance change,the numerical calculation and finite element simulation of tip clearance change were carried out,and the experimental research was carried out for the rotor tester with casing.The tip clearance of two measuring points perpendicular to each other was measured by eddy current sensor.The signal was processed by Hilbert Huang transform to extract its low-frequency component.The cross-correlation analysis method was used to extract the frequency conversion signal,and the axis trajectory was drawn from the frequency conversion component.Compared with the direct measurement of the axis trajectory on the rotating shaft of the same section,the coincidence degree of these two was more than 90%.The test results fully showed the correctness and effectiveness of the research method,providing an effective technical way to indirectly obtain the rotor vibration displacement through the blade tip clearance test.