Int. J. of Industrial and Systems Engineering   »   2014 Vol.17, No.3

 

 

Title: Time-varying stiffness analysis on rotating shaft with elliptical-front crack

 

Authors: Xiaopeng Wei; Dajun Liu; Lasheng Zhao; Qiang Zhang

 

Addresses:
Key Laboratory of Advanced Design and Intelligent Computing, Dalian University, Ministry of Education, Dalian, 116622, China
Key Laboratory of Advanced Design and Intelligent Computing, Dalian University, Ministry of Education, Dalian, 116622, China
Key Laboratory of Advanced Design and Intelligent Computing, Dalian University, Ministry of Education, Dalian, 116622, China
Key Laboratory of Advanced Design and Intelligent Computing, Dalian University, Ministry of Education, Dalian, 116622, China

 

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.

 

Keywords: time-varying stiffness; semi-elliptical front crack; straight front crack; rotating shafts; switching function; rotating machinery; shaft cracks; shaft cracking; modelling; crack propagation.

 

DOI: 10.1504/IJISE.2014.062540

 

Int. J. of Industrial and Systems Engineering, 2014 Vol.17, No.3, pp.302 - 314

 

Available online: 10 Jun 2014

 

 

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