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Study Of Ultrasonic Detection For Bonding Quality Of Thin Plate Based On Wavelet Transformation And Fuzzy Pattern Recognition

Posted on:2007-12-02Degree:MasterType:Thesis
Country:ChinaCandidate:Z Q GaoFull Text:PDF
GTID:2178360185981927Subject:Pattern Recognition and Intelligent Systems
Abstract/Summary:PDF Full Text Request
More and more thin composite materials have been applied in industry of aeronautics and astronautics for their superior performance. Disastrous accidents happen in process of working at times for bonding defect of composite material, so it is urgently needed to make accurate detection for bonding interface and insure the quality of products and working safety. Ultrasonic echo method is widely applied in non-destructive detection for its advantage of accurate defect locating, wide application, convenient operation and so on.Echo signal of ultrasonic detection takes information of interface bonding quality. How to extract the information is the key that bonding quality can be quantitative recognized. Common signal processing methods always analyze echo signal in time or frequency domain solely. So helpful information is not extracted roundly or exactly. This paper designed an echo signal math model, and based on this, we use wavelet transformation to process the echo signal. The echo signal is...
Keywords/Search Tags:ultrasonic detection, echo signal math model, wavelet analyse, fuzzy pattern recognition
PDF Full Text Request
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