지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Smart Structures and Systems, An International Journal Smart Structures and Systems, An International Journal Vol.8 No.3
- 발행연도
- 2011.1
- 수록면
- 303 - 320 (18page)
이용수
초록· 키워드
오류제보하기
Comparing to active damage monitoring, impact localization on composite by using time reversal focusing method has several difficulties. First, the transfer function of the actuator-sensor path is difficult to be obtained because of the limitation that no impact experiment is permitted to perform on the real structure and the difficulty to model it because the performance of real aircraft composite is much more complicated comparing to metal structure. Second, the position of impact is unknown and can not be controlled as the excitation signal used in the active monitoring. This makes it not applicable to compare the difference between the excitation and the focused signal. Another difficulty is that impact signal is frequency broadband, giving rise to the difficulty to process virtual synthesis because of the highly dispersion nature of frequency broadband Lamb wave in plate-like structure. Aiming at developing a practical method for on-line localization of impact on aircraft composite structure which can take advantage of time reversal focusing and does not rely on the transfer function, a PZT sensor array based phase synthesis time reversal impact imaging method is proposed. The complex Shannon wavelet transform is presented to extract the frequency narrow-band signals from the impact responded signals of PZT sensors. A phase synthesis process of the frequency narrow-band signals is implemented to search the time reversal focusing position on the structure which represents the impact position. Evaluation experiments on a carbon fiber composite structure show that the proposed method realizes the impact imaging and localization with an error less than 1.5 cm. Discussion of the influence of velocity errors and measurement noise is also given in detail.
목차
등록된 정보가 없습니다.
참고문헌 (32)
참고문헌 신청
Coverley, P.T / 2003 / Impact damage location in composite structures using optimized sensor triangulation procedure / Smart Mater. Struct 12(5):795~803
Chen, C / 2010 / Impact source identification in finite isotropic plates using a time-reversal method: theoretical study / Smart Mater. Struct 19(10):105028-1~105028-11
Cai, J. / 2011 / High spatial resolution imaging for structural health monitoring based on virtual time reversal / Smart Mater. Struct 20(5):055018-1~055018-11
Ciampa, F / 2011 / Impact detection in anisotropic materials using a time reversal approach / Struct. Health Monit 31
Ding, Y. / 2004 / A new method for waveform analysis for estimating AE wave arrival times using wavelet decomposition / NDT&E Int 37(4):279~290
Chen, C / 2010 / Impact source identification in finite isotropic plates using a time-reversal method: theoretical study / Smart Mater. Struct 19(10):105028-1~105028-11
Cai, J. / 2011 / High spatial resolution imaging for structural health monitoring based on virtual time reversal / Smart Mater. Struct 20(5):055018-1~055018-11
Ciampa, F / 2011 / Impact detection in anisotropic materials using a time reversal approach / Struct. Health Monit 31
Ding, Y. / 2004 / A new method for waveform analysis for estimating AE wave arrival times using wavelet decomposition / NDT&E Int 37(4):279~290
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