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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Smart Structures and Systems, An International Journal Smart Structures and Systems, An International Journal Vol.21 No.2
- 발행연도
- 2018.1
- 수록면
- 195 - 205 (11page)
이용수
초록· 키워드
오류제보하기
Research on Lamb wave-based damage identification in plate-like structures depends on precise knowledge of dispersive wave velocity. However, boundary reflections with the same frequency of interest and greater amplitude contaminate direct waves and thus compromise measurement of Lamb wave dispersion in different materials. In this study, non-reflecting boundaries were proposed in both numerical and experimental cases to facilitate time-frequency characterization of Lamb wave dispersion. First, the Lamb wave equations in isotropic and laminated materials were analytically solved. Second, the non-reflecting boundaries were used as a series of frames with gradually increased damping coefficients in finite element models to absorb waves at boundaries while avoiding wave reflections due to abrupt property changes of each frame. Third, damping clay was sealed at plate edges to reduce the boundary reflection in experimental test. Finally, the direct waves were subjected to the slant-stack and short-time Fourier transformations to calculate the dispersion curves of phase and group velocities, respectively. Both the numerical and experimental results suggest that the boundary reflections are effectively alleviated, and the dispersion curves generated by the time-frequency analysis are consistent with the analytical solutions, demonstrating that the combination of non-reflecting boundary and time-frequency analysis is a feasible and reliable scheme for characterizing Lamb wave dispersion in plate-like structures.
목차
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참고문헌 (22)
참고문헌 신청
Ambrozinski, L. / 2014 / Evaluation of dispersion characteristics of multimodal guided waves using slant stack transform / NDT & E Int. 68:88~97
Drozdz, M. / 2006 / Efficient numerical modelling of absorbing regions for boundaries of guided waves problems / AIP Conference Proceedings 820(1):126~133
Giurgiutiu, V. / 2011 / Piezoelectric wafer active sensors for structural health monitoring of composite structures using tuned guided waves / J. Eng. Mater. Technol. 133(4):041012~041012
He, C. / 2013 / The propagation of coupled Lamb waves in multilayered arbitrary anisotropic composite laminates / J. Sound Vib. 332(26):7243~7256
Hong, M. / 2014 / Modeling nonlinearities of ultrasonic waves for fatigue damage characterization: theory, simulation, and experimental validation / Ultrasonics 54(3):770~778
Drozdz, M. / 2006 / Efficient numerical modelling of absorbing regions for boundaries of guided waves problems / AIP Conference Proceedings 820(1):126~133
Giurgiutiu, V. / 2011 / Piezoelectric wafer active sensors for structural health monitoring of composite structures using tuned guided waves / J. Eng. Mater. Technol. 133(4):041012~041012
He, C. / 2013 / The propagation of coupled Lamb waves in multilayered arbitrary anisotropic composite laminates / J. Sound Vib. 332(26):7243~7256
Hong, M. / 2014 / Modeling nonlinearities of ultrasonic waves for fatigue damage characterization: theory, simulation, and experimental validation / Ultrasonics 54(3):770~778
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