Inverse method for detection and sizing of cracks in thin sections using a hybrid genetic algorithm based signal parametrisation

被引:17
作者
Satyanarayan, L. [1 ,2 ]
Kumaran, K. Bharath [1 ,2 ]
Krishnamurthy, Cn. [1 ,2 ]
Balasubramaniam, Krishnan [1 ,2 ]
机构
[1] Indian Inst Technol, Ctr Non Destruct Evaluat, Madras 600036, Tamil Nadu, India
[2] Indian Inst Technol, Dept Mech Engn, Madras 600036, Tamil Nadu, India
关键词
ultrasound; signal parameterization; FDTD; genetic algorithms; small crack; sizing; NDE; NDT; phased array;
D O I
10.1016/j.tafmec.2007.11.004
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A hybrid-GA method, based on signal parameterization, has been reported here for the improved detection and sizing of surface cracks of small sizes/depths in thin sections. The method relies on parameterizing the composite reference from the defect into its individual components i.e., the crack tip diffracted echo and the corner trap echo and subsequently use the relative arrival time technique (RATT). The phased array ultrasonic technique was employed in the investigation. Both experimental and simulated signals were used in the study. It is shown through both simulations and experiments that the hybrid-GA is successful in parameterizing both non-overlapping and overlapping echoes encountered in thin sections. It is additionally shown that the hybrid-GA improves the signal to noise ratio and correct for under-sampling of data. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:185 / 198
页数:14
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