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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
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WANG Nanshan1,2, LI Yuan2,3, LIU Heng2, LIU Yi2
Abstract: Aiming at the problems of the difficulty in effectively reflecting the singular effect of crack tip and its three-dimensional (3D) morphological characteristics in the study of general integrated rotors with cracks, as well as the difficulty in reflecting the stress influence range of crack faults, system stress recombination, and the impact on the overall initial morphology of combined rotor systems (CRS) with one-dimensional method, a typical three-disc rod-fastening rotor system (RRS) was taken as an example and the influence of 3D crack fault on stress recombination and system bending morphology of RRS was investigated and verified by experiments. Firstly, based on the 3D finite element method, 3D isoparametric singular crack modeling technology was used to establish a 3D crack submodel and a system finite element model with 3D software. Then, the influence of crack and its depth on the stress distribution recombination and the overall bending characteristics of this type of CRS was simulated and analyzed with finite element method. Finally, the influence of cracks on the overall initial bending characteristics of such systems was verified through experiments. The experimental results show that the crack fault of the disk RRS strengthens the local flexibility of the crack location region, the main contact interfaces and the system stress distribution change and recombine, the system stress distribution is uneven and asymmetrical, and the overall bending shape of the rotor changes. When the crack depth is shallow (0.5 mm), the additional bending effect of the rotor induced by the crack is not obvious. With the increase of crack depth, the stress distribution recombination and additional bending become severe. When the crack depth is deeper (1.5 mm or 2.5 mm), the additional bending effect induced by the crack is more prominent. This research has a certain guiding significance for the accurate analysis of the static and dynamic behaviors of the CMS and the abnormal vibration caused by cracks.
Key words: rodfastening rotor system; stress distribution recombination analysis; 3D crack fault; overall bending characteristic; three-dimensional finite element; contact interface stress
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