关键词: 动载荷, 精度提升, 逆矩阵, 传递路径分析, 谐响应

Abstract: In order to achieve simulation and prediction of the vibration performance of motor supports, proposed an analysis method based on the combination of load extraction and finite element simulation. Firstly, the dynamic load identification of the motor is carried out based on the matrix inversion method. Then establish a finite element model, use the extracted motor load as an excitation for harmonic response simulation analysis, and obtain the frequency response curve of the target point. Finally, a comparison was conducted between experiments and simulations to compare the fitting degree of the corresponding frequency domain curves and the trend of RMS values within the 10~150 Hz frequency zone. The results show that the test results of the load extraction experiment have a high degree of agreement with the fitting results, and the load accuracy is relatively high. The deviation between the natural frequency of the established simulation model and the natural frequency of the modal test is within 5%, and the MAC value of the vibration mode comparison is above 95%, indicating high model accuracy. The consistency between the working condition data and the frequency response curve is high, and the minimum error between the experimental RMS value and the simulated RMS value is only 5.82%, achieving simulation prediction of the vibration performance of the motor support.

Key words: Dynamic load, Accuracy improvement, Matrix inversion, TPA, Harmonic response