Time-varying stiffness analysis on rotating shaft with elliptical-front crack
by Xiaopeng Wei; Dajun Liu; Lasheng Zhao; Qiang Zhang
International Journal of Industrial and Systems Engineering (IJISE), Vol. 17, No. 3, 2014

Abstract: The aim of this paper is to investigate the difference of time-varying stiffness characteristics between a semi-elliptical front crack and a straight front crack of shaft-element in order to obtain a more accurate and realistic cracked-rotor model for rotating machinery system. By calculating the correct time-varying area moments of inertia for the cross-section of cracked element and taking account the neutral axis position changes, the switching function is obtained, meanwhile the stiffness of shaft in a steady rotating cycle is determined. The result shows that a significant difference of stiffness appears as crack depth deepens. Especially, the difference between elliptical-front (EF) and straight-front (SF) cracked element is more obvious in the early crack propagation.

Online publication date: Fri, 25-Jul-2014

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