Research And Software Design Of False Defect Identification Method In Ultrasonic Phased Array Inspection System

Ultrasonic phased array inspection technology is widely used in industrial non-destructive inspection due to its excellent inspection efficiency and imaging result.However,the defect identification of large and medium-sized structural welds at home and abroad welds relies entirely on visual recognition and manual identification.When encountering some echo signals caused by unreal defects,it often leads to misjudgment.The identification methods of false defects and a false defect identification software used in the ultrasonic phased array inspection system are studied in this thesis.Firstly,the focusing principle,sound field characteristics of ultrasonic phased array detection and physical concepts related to false defects are introduced which lay a theoretical foundation for subsequent research on false defect.Next,a variety of false defects found in ultrasonic detection are studied in term of cause and identification method.Furthermore,three kinds of false defect which are difficult to manually identify and need physical modeling and mathematical calculations are in-depth research.Based on previous identification method,some improvements are carried out,and corresponding software identification methods are proposed.Secondly,the functions and requirements of the software combined with the existing hardware system are analyzed and the overall design of the false-defect recognition software relied on phased array system is formulated.According to the software’s functional characteristics and development requirements based on Android system,the design scheme of Java and C++ mixed-language programming and the MVP architecture model are applied.A wizard module that guides the user to set various parameters,a calculation formula module that calculates the transmission and reception delays,a gate detection module which positions the echo and provides data support for false-defect identification are designed in the software.Three kinds of false-defect software identification methods are designed and implemented which are followed by echo Data acquisition,theoretical value calculation,comparison and result identification.Finally,with phased array test blocks and the existing hardware system,the performance and function of the software are tested.It is verified that the false-defect identification software based on ultrasonic phased array system designed by the thesis has good functions,and the false defect identification method has reliability and practicability.