基于特征熵奇异值分解的振动传递路径分析方法

doi:10.19562/j.chinasae.qcgc.2025.09.010

Abstract

Abstract:

Operational transfer path analysis （OTPA） is an important way to identify the key transfer paths of complex mechanical systems， but the signal crosstalk between structures seriously affects the analysis accuracy of OTPA. In this paper， the traditional truncated singular value decomposition （TSVD） method is improved based on the entropy theory， and the operational transfer path analysis model based on the entropy singular value decomposition method （OTPA-ESVD） is constructed. In the proposed model， the singular value entropy is used to evaluate the information of eigenvalues， and then the principle of high-contribution pairing is used to design a more comprehensive singular value selection method， which overcomes the dependence on engineering experience of conventional TSVD. In this paper， an actual electric vehicle test is designed to verify the OTPA-ESVD model by comparing it with the operational transfer path analysis model based on the median singular value decomposition （OTPA-MSVD）. The results show that the performance of the OTPA-ESVD model is better than the OTPA-MSVD model under different driving conditions， and the reconstructed target signal of the OTPA-ESVD model is closer to the actual measured signal， with optimization of no less than 13.8% and 8.1% in the comparison of the error root mean square value and the amplitude of the key frequency， respectively.

Key words: electric vehicle, operational transfer path analysis, crosstalk elimination, entropy

Lingchen Kong,Xiaolei Yuan,Xuan Zhao,Qiang Yu,Chenyu Zhou,Rong Huang. A Vibration Transfer Path Analysis Method Based on Entropy Singular Value Decomposition[J].Automotive Engineering, 2025, 47(9): 1742-1751.

Figures/Tables 15

References 23

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参数	数值	参数	数值
尺寸/mm	4700×1930×1625	最小离地间隙/mm	181
轴距/mm	2 875	整备质量/kg	2 230
轮距/mm	1 655/1 650	满载质量/kg	2 605

传感器	产地	量程/g	采样频率/Hz	安装位置	类型	数量
加速度传感器	PCB 美国	0-50	1 000	蓄电池下表面	目标点	1
加速度传感器	PCB 美国	0-50	1 000	悬架上支撑	参考点	4
加速度传感器	PCB 美国	0-100	1 000	车轮轮心	参考点	4
数据采集仪	Dewetron 奥地利		1 000	前排副驾驶		1

速度	名称	误差均方根值/g
80 km/h	OTPA-ESVD	0.000 74
	OPTA-MSVD	0.000 99
	优化	25.2%
50 km/h	OTPA-ESVD	0.000 25
	OPTA-MSVD	0.000 29
	优化	13.8%

频率/Hz	OTPA-MSVD/g	OTPA-ESVD/g	真实值/g	降低/%
1	0.017 1	0.014 1	0.011 0	27.2
13	0.016 7	0.013 5	0.012 1	25.6
33	0.009 8	0.009 1	0.008 0	8.7

频率/Hz	OTPA-MSVD/g	OTPA-ESVD/g	真实值/g	降低 /%
1	0.008 4	0.007 8	0.007 5	8.1
13	0.006 5	0.006 0	0.005 5	9.1
33	0.004 3	0.003 3	0.003 2	31.2

A Vibration Transfer Path Analysis Method Based on Entropy Singular Value Decomposition

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名称缩写	内容描述
SS LF	左前悬架上支撑
SS LR	左后悬架上支撑
SS RF	右前悬架上支撑
SS RR	右后悬架上支撑
WC LF	左前车轮轮心
WC LR	左后车轮轮心
WC RF	右前车轮轮心
WC RR	右后车轮轮心

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