An improved transfer path analysis method based on structural dynamic modification technique

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 222-228.

XU Tie1,WANG Zengwei2,3,LIAO Yi1,CHEN Danhua1,QIN Zhiwei2,3,ZHU Ping2,3

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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.

Key words

transfer path analysis / structural modifications / vehicle body vibration / frequency response function / response prediction

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XU Tie1,WANG Zengwei2,3,LIAO Yi1,CHEN Danhua1,QIN Zhiwei2,3,ZHU Ping2,3. An improved transfer path analysis method based on structural dynamic modification technique[J]. Journal of Vibration and Shock, 2019, 38(5): 222-228

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