Damage Identification for Curl Tube Structure Based on Modal Flexibility Curvature

Abstract:

To detect the damage of curl tube structure with more effect, the finite element method (FEM) and experimental modal analysis (EMA) were employeed to generate the modal flexibility of the curl tube. The modal flexibility was used to compute the modal flexibility-curvature by using the central difference method. Different degrees and locations of damage were simulated by additional quality in the intact curl tube to verify the modal flexibility-curvature and difference generated by both FEM and EMA. The results show that the modal flexibility of curl tube should have the direction. In addition, we conclude that the flexibility curvature’s difference in x and y plane can not be used for damage identification. But using the flexibility curvature’s difference of the z direction in the vertical plane, we can not only identified the multiple damage location, but also to analized degree for the extent of injury to the same location .

• Periodical: Advanced Materials Research (Volumes 490-495)
• Pages: 2151-2155
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.490-495.2151
• Online since: March 2012
• Authors: Yong Jun Li, Li Yuan Ma, Tian Hui Wang
• Keywords: Curl Tube, Damage Identification, Directional Flexibility, Experimental Verification, Modal Difference, Modal Flexibility-Curvature

References

[1] Doebling S W, Farrar C R，Prime M B. Summary review of vibration-based damage identification methods[J]．Shock and Vibration Digest，1998，30(2). 91-105.

DOI: 10.1177/058310249803000201

[2] Hu Jia-Shun, Feng Xin, Li Xin, Zhou Jing. State of art of vibration analysis and crack identification of cracked beams[J]. Journal of Vibration and Shock, 2007, 26(11): 146-152. in Chinese.

[3] Hu Jia-shun, Sun Wen-yong, Niu Yun, Feng Xin, Zhou Jin. Local flexibility of a pipe with a through circumferential crack[J]. Journal of Vibration and Shock, 2010，29(11): 199-203. in Chinese.

[4] Hu Jia-shun, Feng Xin, Zhou Jing. Theoretical and experimental study on local flexibility of pipe with a part-through circumferential crack[J]. Engineering Mechanics2010, 27(4): 37-43. in Chinese.

[5] Wang Ning, Tu Shan-dong, Xie Guo-fu, Liu Long. Identification on Creep Damage of High-temperature Pipelines Based on Vibration Characteristics[J]. Journal of Chinese Society of Power Engineering, 2011, 31(3): 227-232.

[6] Cao Hui, Michael I. Friswell. Nondestructive demage evalution indicator based on modal flexibility cruvature[J]. Engineering Mechanics, 2006, 23 (4)：33-38. in Chinese.

[7] Othman MIA, SONG Ya-qin. Effect of rotation on plane waves of generalized electro magneto-thermovisco elasticity with two relaxation times[J]. Applied Mathematical Modelling, 2008, 32(5): 811―816.

DOI: 10.1016/j.apm.2007.02.025

[8] Xu Hua-dong, Wang Li-hai, Hu Zhi-dong. Quantitative Identification of Wood Beam Damage Using Modal Curvature Theory[J]. Journal of Vibration, Measurement & Diagnosis, 2011, 31(1): 110-114. in Chinese.

[9] Chen Huai, LI Jing-bin, YIN Xue-gang. On a New Experimental Method for Structural Damage Identification[J]. Journal of Experimental Mechanics, 2011, 26(1): 96-102. in Chinese.