| Citation: | WU Fanqi, ZANG Chaoping, GAO Dongwu, et al. Selection of sensor locations of whole engine for monitoring vibrations of rotor system[J]. Journal of Aerospace Power, 2025, 40（9）：20230164 doi: 10.13224/j.cnki.jasp.20230164
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A method was proposed for the selection of sensor locations on the case surface of the whole engine for vibration monitoring of a rotor system. A sensitivity analysis of responses on the case surface with respect to rotor excitations was developed through vibration responses of the whole engine under excitations caused by the rotor system. An effective-independence method was developed to analyze the independence of measurement points according to the sensitivity information. Furthermore, the optimal locations of measuring points on the case surface can be selected considering the sensitivity and independence of each measuring point comprehensively. Taking the test rig of a single rotor system designed with the similarity of dynamics of an aero-engine, as an example, the two optimal measuring points on the casing were firstly selected using the finite element modelling and analysis for effectively monitoring the rotor vibration. Afterwards, measurement on the test rig was carried out at different rotating speeds and the response results were compared with the predicted before. A good agreement was matched between the measurement and the predicted result. The sensitivity of the best measuring point can be up to 3 times higher than that of other measuring points, which had a satisfactory vibration monitoring effect.
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