超聲相控技術在復合材料缺陷檢測中的應用
[Abstract]:At present, composite materials have been applied more and more in aerospace, aviation, automobile and construction industries because of their light, high strength and excellent properties. Because of the complexity of molding and the possible problems in fabrication, the composites are prone to various defects and damage, so it is necessary to carry out nondestructive testing. In view of the extensive use of new composite materials in the industrial field, its stability has become the focus of increasing attention, so a new requirement for nondestructive testing of composite materials is put forward. As a way of nondestructive testing, ultrasonic phased array technology has become a hot spot in international research. Its detection efficiency is higher than that of traditional nondestructive testing technology, and the professional quality of operators is relatively low. Therefore, the study of ultrasonic phased array technology has certain practical significance. In this paper, the characteristics of common damage of composite materials and the advantages of ultrasonic phased array detection are studied, and a complete detection scheme is designed. Through theoretical analysis and calculation simulation of sound field directivity of ultrasonic phased array, the array element spacing and array length are discussed. The effect of the number of array elements, the width of array elements and the deflection angle on the beam deflection focusing is obtained by controlling the delay time. It provides a theoretical basis for the final selection of phased array transducer parameters. According to the characteristics of sound field directivity, the appropriate parameters of phased array probe are selected, and then the returned scanning images are analyzed to judge the defect type and related data. The ultrasonic phased array technology has a great advantage in detecting the defects of new composite materials. At present, in the process of ultrasonic phased array detection, the defect identification of the testing results still needs to be analyzed by the work experience of the examiners. Therefore, in order to better analyze and identify the defect detection results of composite materials, By comparing BP neural network and RBF neural network algorithm, it is concluded that the automatic defect recognition method based on RBF neural network is more suitable for aluminum alloy composite material detection within the range of error.
【學位授予單位】:中國民航大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TB33;TB302.5
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