유도초음파를 활용한 경사각 결함의 각도 변화에 따른 산란 신호해석 연구 (A Study on Scattering Signal Analysis based on Angle Changes of Tapered Defect using Guided Waves)

서지정보

· 발행기관 : 한국정밀공학회
· 수록지 정보 : 한국정밀공학회지 / 36권 / 9호 / 837 ~ 842페이지
· 저자명 : 이재선

초록

The guided ultrasonic wave has the advantage of diagnosis on a wide area within in a short time due to the long distance propagation characteristic. However, there are many difficulties in signal analysis due to the mode conversions in the reflection from the defect and boundaries. In the use of guided waves for structure monitoring, it is necessary to understand the relation between the propagation mode and the mode of variation according to the shape of the defect. In this study, the characteristics of induced ultrasonic mode conversion is analyzed in taper defects formed from the surface of an aluminum plate. The defect depths of the plate thickness are 20, 50, and 80% and the characteristics of the reflection and transmission modes are analyzed on various defect widths, depending on the angle of change of the tapered shape. The A0 and S0 modes were selected as the excitation mode of the guided waves, the transmission and reflection coefficient amplitudes are analyzed. It is confirmed that the wavelength of the excitation mode having a large influence on the amplitude of the transmission and reflection signals generated by the taper defects depend on the shape of the defect.

영어초록

The guided ultrasonic wave has the advantage of diagnosis on a wide area within in a short time due to the long distance propagation characteristic. However, there are many difficulties in signal analysis due to the mode conversions in the reflection from the defect and boundaries. In the use of guided waves for structure monitoring, it is necessary to understand the relation between the propagation mode and the mode of variation according to the shape of the defect. In this study, the characteristics of induced ultrasonic mode conversion is analyzed in taper defects formed from the surface of an aluminum plate. The defect depths of the plate thickness are 20, 50, and 80% and the characteristics of the reflection and transmission modes are analyzed on various defect widths, depending on the angle of change of the tapered shape. The A0 and S0 modes were selected as the excitation mode of the guided waves, the transmission and reflection coefficient amplitudes are analyzed. It is confirmed that the wavelength of the excitation mode having a large influence on the amplitude of the transmission and reflection signals generated by the taper defects depend on the shape of the defect.

참고자료

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