Influences of blade crack on the coupling characteristics in a bladed disk with elastic support

Zhi-Yuan Wu; Han Yan; Lin-Chuan ZhaoGe YanAo ChenHai-Feng HuWen-Ming Zhang

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Influences of blade crack on the coupling characteristics in a bladed disk with elastic support

机译：Influences of blade crack on the coupling characteristics in a bladed disk with elastic support

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摘要

In aero-engines, the blades are exposed to severe environments and subjected to complex conditions, which can cause damage and cracks. Existing analytical models focus primarily on the blade crack in a single blade. Even in the cracked-bladed disk system, most theoretical models are based on the rigid disk assumption, and few studies pay attention to the boundary conditions of the disk. A new model is proposed in this paper to compensate for deficiencies in existing theoretical models. The flexible disk and blade are deduced based on Kirchhoff plate and Timoshenko beam theories. The crack-caused stiffness loss is calculated through the released strain energy. In addition, the elastic support on the disk's inner edge is simulated by the linear spring stiffness and torsional stiffness. The accuracy of the developed model is verified by comparing it with the finite element method and experimental test. After that, the influences of the crack depth and crack location on the coupling characteristics of the system are systematically investigated. The results indicate that blade crack mainly affects the blade-predominated modes, leading to the mistuned disk mode shapes, which are symmetrically distributed along the line between the cracked blade and the disk center. Moreover, as the blade crack becomes severe or approaches the blade root, the first natural frequency of the paired orthogonal modes decreases; the first mode shape of the paired tuned high nodal diameter degenerates into mistuned low nodal diameter; the new coupling characteristics between the mistuned disk and elastic support become more stronger. The proposed methodology can serve as a theoretical basis for diagnosing faults and monitoring safety in the bladed disk coupling system.

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来源
《Aerospace science and technology》 |2023年第2期|108135.1-108135.16|共16页
作者
Zhi-Yuan Wu; Han Yan; Lin-Chuan ZhaoGe YanAo ChenHai-Feng HuWen-Ming Zhang;
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作者单位

State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China;

Aerospace System Engineering Shanghai, 3888 Yuanjiang Road, Shanghai 201108, China;

Science and Technology on Integrated Logistics Support Laboratory, National University of Defense Technology, Changsha, 410075, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Blade crack; Coupling characteristics; Bladed disk; Elastic support; Nodal diameter; Mistuned disk;

Influences of blade crack on the coupling characteristics in a bladed disk with elastic support

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