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Date of Publication:2021-01-01

Journal:Zhendong yu Chongji/Journal of Vibration and Shock

Affiliation of Author(s):能源与动力学院

Volume:40

Issue:16

Page Number:159-165 and 203

ISSN No.:1000-3835

Abstract:Misalignment of a multi-support rotor system is one of the most common fault conditions. A low-pressure rotor system of aero-engine uses spline joint for connecting, which constitutes statically an indeterminate rotor system (SIRS) with three elastic supports. The inherent defect of SIRS is extremely sensitive to misalignment. In this paper, an analytical dynamic model of SIRS was derived using a combination of the force method and the virtual work principle about the D'Alembert principle under alignment and misalignment of turbine back support conditions, and misalignment dynamic loads were detailed derived to determine the natural frequency and vibration responses. In this paper, the aeroengine hyperstatic rotor system was taken as the research object, and the analytical model derivation and experimental verification were carried out for its complete alignment and tail fulcrum misalignment and both theoretical and experimental results agree well. As a result, with the increase of misalignment, frequency multiplication components occur, 2X component and increase linearly, the orbits change from ellipse to inside "8" shape. Due to the structural particularity of SIRS, the appearance of TBS misalignment which generates the dynamic external excitations, makes the response of low-pressure turbine more severely. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.

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