Inertial parametric identification method for test modal analysis considering coordinate acquisition
DU Zhonggang1, SUN Yonghou1, LIU Fuyun1,2, YE Mingsong2, DENG Jucai2, TANG Jinshuai1
1.School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
2.Commercial Vehicle Technology Center, Dongfeng Liuzhou Motor Co., Ltd., Liuzhou 545005, China
Abstract：Accurate and efficient coordinate acquisition methods are of great significance in parameter identification and performance optimization of modal analysis. Based on the free modal experiment of Rigid body vibration principle, the conversion relationship between the linear parameters and the angular parameters were analyzed. The equations of the excitation and response coordinates were derived. The inertial parameter expressions were obtained by combining the mass line method. By studying the influencing factors of the coordinate acquisition error, a simulation test platform of the engine dynamics model was built to further verify the method of coordinate acquisition and inertial parameter identification. As the test object with a certain type of gearbox, the data were smoothed and filtered by the convolution fitting algorithm based on Savitzky-Golay (SG). Comparing the accuracy of the electronic three-dimensions coordinate system method, the three-dimensions model method and the proposed method in the coordinate acquisition and then selecting the mass line method to identify the inertial parameters. The results were discussed with those calculated by the MPC moment of inertia test platform. The results showed that compared with the traditional method, the proposed method obtains coordinates directly from the modal experiment, which improved the efficiency greatly, reduced the cost significantly and it’s easier for users to operate equipment. At the same time, the maximum error of geometric coordinate acquisition and centroid coordinate recognition are about 3mm. And the relative error of moment of inertia is not more than 7%. Accuracy of inertial parameters and coordinates is better than other measurement methods. It has certain engineering value in practicing.
杜中刚1，孙永厚1，刘夫云1,2，叶明松2，邓聚才2，汤金帅1. 考虑坐标获取的试验模态分析的惯性参数识别方法[J]. 振动与冲击, 2023, 42(7): 89-98.
DU Zhonggang1, SUN Yonghou1, LIU Fuyun1,2, YE Mingsong2, DENG Jucai2, TANG Jinshuai1. Inertial parametric identification method for test modal analysis considering coordinate acquisition. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(7): 89-98.
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