A reverse method of unbalance response at bearing position of thin-walled casing engines

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (16) : 89-95.

FENG Kun1,2，ZHU Zhenqiao3，ZUO Yanfei3，WANG Chen3，HU Minghui1,2，GENG Binbin1

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Abstract

The efficiency of controlling unbalance vibration of gas turbines can be greatly improved by overall maneuver balance compared with the traditional process.However, since the measuring points of vibration can be only located on the surface of the thin-walled casing structure, the unbalance response of the bearing position cannot be directly measured, which makes the overall maneuver balance more difficult.Therefore, an inverse method for calculating unbalance response vector of bearing position based on external vibration signal of casing was proposed in this paper.Considering the influence of the dynamic characteristics of the thin-walled support structure, the influence function matrix between the vibration response of the measuring points and the unbalance excitations of the bearing position was obtained through numerical simulation combined with tests.The unbalance response vector of the bearing position was inversely calculated by using the function matrix and the vibration of the casing measurement point.The method was validated by numerical simulation results of a high-fidelity thin-walled casing model of a typical double-rotor engine.This method has certain application value for reversely calculating rotor imbalance vector and vibration control of engines.

Key words

thin-walled casing / unbalance response vector / reverse calculation / numerical simulation

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FENG Kun1,2，ZHU Zhenqiao3，ZUO Yanfei3，WANG Chen3，HU Minghui1,2，GENG Binbin1. A reverse method of unbalance response at bearing position of thin-walled casing engines[J]. Journal of Vibration and Shock, 2020, 39(16): 89-95

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