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 rotat...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2016-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2016/4197203 |
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| _version_ | 1832560240784048128 |
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| author | Hailong Xu Zhongsheng Chen Yeping Xiong Yongmin Yang Limin Tao |
| author_facet | Hailong Xu Zhongsheng Chen Yeping Xiong Yongmin Yang Limin Tao |
| author_sort | Hailong Xu |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-4c3e4fc886214631a860d52782b2e630 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-4c3e4fc886214631a860d52782b2e6302025-02-03T01:28:02ZengWileyShock and Vibration1070-96221875-92032016-01-01201610.1155/2016/41972034197203Nonlinear Dynamic Behaviors of Rotated Blades with Small Breathing Cracks Based on Vibration Power Flow AnalysisHailong Xu0Zhongsheng Chen1Yeping Xiong2Yongmin Yang3Limin Tao4Science and Technology on Integrated Logistics Support Laboratory, National University of Defense Technology, Changsha 410073, ChinaScience and Technology on Integrated Logistics Support Laboratory, National University of Defense Technology, Changsha 410073, ChinaFaculty of Engineering and the Environment, University of Southampton, Southampton SO16 7QF, UKScience and Technology on Integrated Logistics Support Laboratory, National University of Defense Technology, Changsha 410073, ChinaScience and Technology on Integrated Logistics Support Laboratory, National University of Defense Technology, Changsha 410073, ChinaRotated 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.http://dx.doi.org/10.1155/2016/4197203 |
| spellingShingle | Hailong Xu Zhongsheng Chen Yeping Xiong Yongmin Yang Limin Tao Nonlinear Dynamic Behaviors of Rotated Blades with Small Breathing Cracks Based on Vibration Power Flow Analysis Shock and Vibration |
| title | Nonlinear Dynamic Behaviors of Rotated Blades with Small Breathing Cracks Based on Vibration Power Flow Analysis |
| title_full | Nonlinear Dynamic Behaviors of Rotated Blades with Small Breathing Cracks Based on Vibration Power Flow Analysis |
| title_fullStr | Nonlinear Dynamic Behaviors of Rotated Blades with Small Breathing Cracks Based on Vibration Power Flow Analysis |
| title_full_unstemmed | Nonlinear Dynamic Behaviors of Rotated Blades with Small Breathing Cracks Based on Vibration Power Flow Analysis |
| title_short | Nonlinear Dynamic Behaviors of Rotated Blades with Small Breathing Cracks Based on Vibration Power Flow Analysis |
| title_sort | nonlinear dynamic behaviors of rotated blades with small breathing cracks based on vibration power flow analysis |
| url | http://dx.doi.org/10.1155/2016/4197203 |
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