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| An improved transfer path analysis method based on structural dynamic modification technique |
| XU Tie1,WANG Zengwei2,3,LIAO Yi1,CHEN Danhua1,QIN Zhiwei2,3,ZHU Ping2,3 |
1. SAIC GM Wuling Automobile Co, Ltd, Liuzhou 545007, China;
2. Shanghai Key Lab of Digital Manufacture for Thin-walled Structure, Shanghai Jiao Tong University, Shanghai 200240, China;
3. State Key Lab of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract In order to overcome limitations of the traditional transfer path analysis (TPA) method, a novel TPA method based on structural dynamic modification technique was proposed. With this method, the system’s frequency response function (FRF) was used to estimate FRFs of passive parts, to identify coupling force using operational response data and to realize the path contribution analysis. A numerical example was employed for the purpose of demo of this method, and the correctness of its theory was verified. Finally, the method was used to study a vehicle body vibration problem. Its engine mounting point’s acceleration and its inside floor’s acceleration were taken as study objects for vibration transfer path analysis. The results showed that FRFs of passive parts predicted using this method agree well with those of test measurements; the analysis results with a similar accuracy to that of traditional TPA are obtained without splitting the system; the engineering feasibility and application simplicity of the proposed method are verified; the results provide a new way for NVH performance analysis of vehicle bodies.
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Received: 04 July 2017
Published: 28 February 2019
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