Vibration source analysis of rotating machinery based on working condition transmission path

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (17) : 276-281.

MA Gao1, CHEN Yaming2, SHEN Deming3,4, YANG Jiangang1, TAN Ping1

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Abstract

Operational transfer path analysis (OTPA) is an effective method to find the vibration source. However, OTPA requires large amounts of data under operating conditions, which is unrealistic for many rotating machineries. To solve this problem, an OTPA method based on frequency response function (FRF) is proposed. Firstly, the FRFs in the complete machine state obtained by experiment are used to establish the OTPA model. Then, SVD is used to eliminate the crosstalk between different inputs. Finally, the vibration sensitivity of the casing is determined by transmission function, and the vibration source is determined by vibration contribution. The experimental research was carried out on the aero-engine test bench and the results verified the feasibility of the method.
Key Words：vibration；OTPA；frequency response function；transmissibility function；SVD

Key words

vibration / OTPA / frequency response function / transmissibility function / SVD

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MA Gao1, CHEN Yaming2, SHEN Deming3,4, YANG Jiangang1, TAN Ping1. Vibration source analysis of rotating machinery based on working condition transmission path[J]. Journal of Vibration and Shock, 2022, 41(17): 276-281

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