涡轮增压器转子模态测试研究

摘要

The modal test was carried out by impact method while the rotor of the turbocharger free modal validation proceeded.Within the scope of the sampling frequency correlation coefficient tends to 1;the frequency response function FRF is clear;excitation signal power spectral density of attenuation is smooth and not change.Through LMS test system directly modal fitting frequency response function of nine points, the error of fitting curve and data is less than 1%.The first two order modal frequency rotor of the turbocharger test, 1 order bending frequency is 1081.7Hz while 2 order bending frequency is 3565.6Hz.The results indicated that the first two order natural frequency and modal vibration mode of the turbocharger rotor were both reliable and accurate.Compared to the natural frequency and mode shape results by numerical analysis, they were consistent and the error was acceptability.%采用锤击法对某涡轮增压器转子进行模态测试,并对其自由模态进行模态拟合和模态验证.在采集频率范围内相干系数趋于1,频响函数FRF清晰,且激励信号的功率谱密度衰减平稳,无骤变;通过LMS测试系统直接对9个测点的频响函数进行模态拟合,拟合曲线与采集数据误差低于1%;涡轮增压器转子前两阶模态频率测试,1阶弯曲频率1081.7Hz,2阶弯曲频率3565.6Hz.表明测试得到涡轮增压器转子前两阶固有频率和模态振型具有较高的测试精度和可信度.对有限元数值计算结果进行了模态频率和振型校核,误差满足工程应用需求.