Composites Sheet Damage Acoustic Emission Localization Method Based on Optical Fiber Intensity Sensing Technology
摘 要
声发射具有对缺陷起始和扩展探测灵敏的特点,适用于复合材料薄板损伤检测,其中定位方法的研究是关键技术之一。文章结合光纤传感技术,设计并构建了声发射检测系统,实现了复合材料薄板的损伤源定位。基于三角定位原理,进行分布式光纤传感布置,在复合材料薄板上方获取损伤信号。然后将测得的信号依次利用Daubechies10小波和Gabor小波进行背景去噪和信号峰值提取,从而获得损伤源释放的A0模态兰姆波传播到各个传感器的精确时间。最后由到达时间依据三角损伤定位算法建立非线性方程组,通过计算即可求出损伤源位置。相比其它方法,该方法具有非接触、无需测量对象材料参数的优点,在复合材料薄板损伤检测应用中有重要意义。
Abstract
Acoustic emission can be applied for composites sheet damage detection because of its being sensitive to the defects generation and expansion, and damage location is the key technology in acoustic emission. This paper provided an acoustic emission detection system combined with optical fiber sensing technology, identified the location of damage sources in composites sheets. The distributed optical fiber sensors were arranged on the top of composites sheet based on triangulation principle to detect damage signals. Then, Daubechies10 wavelet and Gabor wavelet were used to denoising and acquire signal peak to obtain the propagation time of Lamb mode(A0). Finally, the location of destructive source was obtained by computing for non-linear equations, which were established by the time of arrivals based on triangulation. This method had the advantage over other methods, such as non-contact and no use of material parameters. It was an important method to detect composites sheet damage.
中图分类号 TG115.28
所属栏目 2011年远东无损检测论坛论文精选
基金项目 南京航空航天大学基本科研业务费专项科研项目资助项目(NS2011017);南京航空航天大学2010年度研究生创新基地(实验室)开放基金资助项目(201002011)
收稿日期 2011/5/30
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备注朱永凯(1975- ),男,博士,副教授,主要研究方向为结构健康检测、智能传感技术。
引用该论文: ZHU Yong-Kai,CHONG Bo,LIN Xiao-Ming,PAN Ren-Qian,WANG Zhi-Hong. Composites Sheet Damage Acoustic Emission Localization Method Based on Optical Fiber Intensity Sensing Technology[J]. Nondestructive Testing, 2011, 33(12): 54~57
朱永凯,崇博,林啸鸣,潘仁前,王志宏. 基于强度型光纤传感技术的复合材料薄板损伤声发射定位法[J]. 无损检测, 2011, 33(12): 54~57
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参考文献
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【2】《航空制造过程手册》总编委主编.航空制造工程手册——工艺检测[M].北京:航空工业出版社,1993.
【3】Kessler Seth S, Spearing S Mark, Soutis Constantions. Damage detection in composite materials using Lamb wave methods[J]. Smart Mater Struct,2002,11(2):269-278.
【4】Kudela P, Ostachowicz W, Zak A. Damage detection in composite plates with embedded PZT transduces[J]. Mechaniacl System and Signal Processing,2008,22(6):1805-1829.
【5】Ostachowicz Wieslwa, Kudela Pawel, Malinowski Pawel, et al. Damage localisation in plate-like structures based on PZT sensors[J]. Mechaniacl System and Signal Processing,2009,23(6):1327-1335.
【6】Fu Tao, Liu Yanju, Li Quanlong, et al. Fiber optic acoustic emission sensor and its applications in the structural health monitoring of CFRP materials[J]. Optics and Lasers in Engineering,2009,47(10):1056-1062.
【7】Read Ian, Foote Peter, Murray Stuart. Optical fibre acoustic emission sensor for damage detection in carbon fibre composite structures[J]. Meas Sci Technol,2002,13(1):N5-N9.
【8】Tsuda H, Takahashi J, Urabe K. Damage monitoring of carbon fiber-reinforced plastics with Michelson interferometric fiber-optic sensors[J]. Journal of Materals Science,1999,34(17):4163-4172.
【9】Paget C A, Atherton K, O’Brien E. Triangulation algorithm for damage location in aeronautical composite structures[C]. Proceeding of the 4th International Workshop on Structural Health Monitoring, Stanford, CA: 2003.
【10】Ciampa F, Meo M. A new algorithm for acoustic emission localization and flexural group velocity determination in anisotropic structures[J]. Composites: Part A,2010(8):13.
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