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Nonlinear dynamic behaviors of rotated blades with small breathing cracks based on vibration power flow analysis

Nonlinear dynamic behaviors of rotated blades with small breathing cracks based on vibration power flow analysis
Nonlinear dynamic behaviors of rotated blades with small breathing cracks based on vibration power flow analysis
Rotated blades are key mechanical components in turbomachinery and high cycle fatigues often induce blade cracks. Accurate detection of small cracks in rotated blades is very significant for safety, reliability, and availability. In nature, a breathing crack model is fit for a small crack in a rotated blade rather than other models. However, traditional vibration displacements-based methods are less sensitive to nonlinear characteristics due to small breathing cracks. In order to solve this problem, vibration power flow analysis (VPFA) is proposed to analyze nonlinear dynamic behaviors of rotated blades with small breathing cracks in this paper. Firstly, local flexibility due to a crack is derived and then time-varying dynamic model of the rotated blade with a small breathing crack is built. Based on it, the corresponding vibration power flow model is presented. Finally, VPFA-based numerical simulations are done to validate nonlinear behaviors of the cracked blade. The results demonstrate that nonlinear behaviors of a crack can be enhanced by power flow analysis and VPFA is more sensitive to a small breathing crack than displacements-based vibration analysis. Bifurcations will occur due to breathing cracks and subharmonic resonance factors can be defined to identify breathing cracks. Thus the proposed method can provide a promising way for detecting and predicting small breathing cracks in rotated blades.
1070-9622
1-11
Xu, Hailong
7e069a82-9c9f-45e2-8aea-6f8416fe0000
Chen, Zhongsheng
9893f775-a26a-4ebe-a4d9-d8224838fc9d
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Yang, Yongmin
ebcf182b-0882-4ca6-82f4-6f705b14d1e0
Tao, Limin
59af89e5-1f00-4fe6-9ddb-da100ebe9e15
Xu, Hailong
7e069a82-9c9f-45e2-8aea-6f8416fe0000
Chen, Zhongsheng
9893f775-a26a-4ebe-a4d9-d8224838fc9d
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Yang, Yongmin
ebcf182b-0882-4ca6-82f4-6f705b14d1e0
Tao, Limin
59af89e5-1f00-4fe6-9ddb-da100ebe9e15

Xu, Hailong, Chen, Zhongsheng, Xiong, Yeping, Yang, Yongmin and Tao, Limin (2016) Nonlinear dynamic behaviors of rotated blades with small breathing cracks based on vibration power flow analysis. Shock and Vibration, 2016 (4197203), 1-11. (doi:10.1155/2016/4197203).

Record type: Article

Abstract

Rotated blades are key mechanical components in turbomachinery and high cycle fatigues often induce blade cracks. Accurate detection of small cracks in rotated blades is very significant for safety, reliability, and availability. In nature, a breathing crack model is fit for a small crack in a rotated blade rather than other models. However, traditional vibration displacements-based methods are less sensitive to nonlinear characteristics due to small breathing cracks. In order to solve this problem, vibration power flow analysis (VPFA) is proposed to analyze nonlinear dynamic behaviors of rotated blades with small breathing cracks in this paper. Firstly, local flexibility due to a crack is derived and then time-varying dynamic model of the rotated blade with a small breathing crack is built. Based on it, the corresponding vibration power flow model is presented. Finally, VPFA-based numerical simulations are done to validate nonlinear behaviors of the cracked blade. The results demonstrate that nonlinear behaviors of a crack can be enhanced by power flow analysis and VPFA is more sensitive to a small breathing crack than displacements-based vibration analysis. Bifurcations will occur due to breathing cracks and subharmonic resonance factors can be defined to identify breathing cracks. Thus the proposed method can provide a promising way for detecting and predicting small breathing cracks in rotated blades.

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More information

Accepted/In Press date: 29 June 2016
e-pub ahead of print date: 2 August 2016
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 402163
URI: http://eprints.soton.ac.uk/id/eprint/402163
ISSN: 1070-9622
PURE UUID: 7da88c93-9313-42b9-ab1d-0f97e5c4f5b3
ORCID for Yeping Xiong: ORCID iD orcid.org/0000-0002-0135-8464

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Date deposited: 02 Nov 2016 15:13
Last modified: 07 Oct 2020 01:45

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Contributors

Author: Hailong Xu
Author: Zhongsheng Chen
Author: Yeping Xiong ORCID iD
Author: Yongmin Yang
Author: Limin Tao

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