Identification of small crack in Beam Structures using Anti-Resonant Frequency and Wavelet analysis

摘要：

Structural crack identification has been received considerable attention in recent decade.A lot of different techniques like acoustic emission,ultrasonic,or X-ray,etc have been used for structural crack detection.However,it is still difficult to identify the small crack in structures.A new method for identification of small crack in beam structures using the first anti-resonant frequency curve is proposed in this paper.The method makes use of the driving-point mechanical impedance characteristics of beam structures and a simplified rotational spring model to model the edge crack of beam.After the first anti-resonant frequency curve is obtained,signal process based on wavelet transformation will be carried out and the small crack in beam structures can be explored.The proposed method is validated by a numerical example of cracked beam with pinned-pinned or fixed-free boundary.It is concluded that not only the location of beam crack can be determined,but also the extent of crack damage can be identified qualitatively based on the first anti-resonant frequency curve and wavelet analysis.

关键词： anti-resonant frequency wavelet analysis rotational spring model crack identification

作者: Dansheng Wang Danyan Shen Hongping Zhu

作者单位: School of Civil Engineering & Mechanics,Huazhong University of Science and Technology Hubei Key Laboratory of Control Structure,Huazhong University of Science and Technology,Wuhan,430074 P.R.China

会议类型: 国际会议

会议名称: The 8th International Conference on Damage Assessment of Structures(DAMAS 2009)(第八届结构损伤评价国际学术会议)

会议地点: 北京

会议语种:英文

页码: 63-70

在线出版日期: 2009-08-03（万方平台首次上网日期，不代表论文的发表时间）