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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
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- 대한기계학회 Journal of Mechanical Science and Technology Journal of Mechanical Science and Technology Vol.21 No.7
- 발행연도
- 2007.7
- 수록면
- 997 - 1,007 (11page)
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This paper investigates the performance of a nonlinear damage detection method using sensitivity enhancing control (SEC). Damage nonlinearity due to the cyclic behavior of crack breathing could provide valuable evidence of structural damage without information of the structure’s original healthy condition. Not having such information is considered a major challenge in vibration-based damage detection. In this study, two different categories of damage detection methods are investigated: frequency and time-domain techniques focusing on the benefit of SEC for breathing-type nonlinear damage in a structure. Numerical simulations using a cantilevered beam and spring-mass-damper system demonstrated that the level of nonlinear dynamic behavior heavily depends on the closed-loop pole placement through feedback control. According to SEC theory, the characteristic of the feedback gain defines the sensitivity of modal frequency to the change of stiffness or mass of the system. The sensitivity enhancement by properly designed closedloop pole location more visually clarifies the evidence of crack nonlinearity than the open-loop case where no sensitivity is enhanced. A damage detection filter that uses time series data could directly benefit from implementing SEC. The amplitude of damage-evident error signal of the closed-loop case significantly increases more than that of the open-loop case if feedback control or SEC properly modifies the dynamics of the system.
목차
Abstract
1. Introduction
2. Description of breathing crack
3. Sensitivity Enhancing Control (SEC)
4. Implementing SEC for breathing crack simulation
5. Conclusions
Acknowledgment
References
참고문헌 (19)
참고문헌 신청
Chati, M., Rand, R. and Mukherjee, S., 1997, “Modal Analysis of a Cracked Beam,” Journal of Sound and Vibration, Vol. 207, No. 2, pp. 249~270.
Cheng, S. M., Wu, X. J., Wallace, W. and Swamidas, A. S. J., 1999, “Vibrational Response of a Beam with a Breathing Crack,” Journal of Sound and Vibration, Vol. 225, No. 1, pp. 201~208.
Chondros, T. G., Dimarogonas, A. D. and Yao, J., 2001, “Vibration of a Beam with a Breathing Crack,” Journal of Sound and Vibration, Vol. 239, No. 1, pp. 57~67.
Douka, E. and Hadjileontiadis, L. J., 2005, “Time–frequency Analysis of the Free Vibration Response of a Beam with a Breathing Crack,” NDT & E International, Vol. 38, No. 1, pp. 3~10.
Kisa, M. and Brandon, J., 2000, “The Effects of Closure of Cracks on the Dynamics of a Cracked Cantilever Beam,” Journal of Sound and Vibration, Vol. 238, No. 1, pp. 1~18.
Cheng, S. M., Wu, X. J., Wallace, W. and Swamidas, A. S. J., 1999, “Vibrational Response of a Beam with a Breathing Crack,” Journal of Sound and Vibration, Vol. 225, No. 1, pp. 201~208.
Chondros, T. G., Dimarogonas, A. D. and Yao, J., 2001, “Vibration of a Beam with a Breathing Crack,” Journal of Sound and Vibration, Vol. 239, No. 1, pp. 57~67.
Douka, E. and Hadjileontiadis, L. J., 2005, “Time–frequency Analysis of the Free Vibration Response of a Beam with a Breathing Crack,” NDT & E International, Vol. 38, No. 1, pp. 3~10.
Kisa, M. and Brandon, J., 2000, “The Effects of Closure of Cracks on the Dynamics of a Cracked Cantilever Beam,” Journal of Sound and Vibration, Vol. 238, No. 1, pp. 1~18.
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UCI(KEPA) : I410-ECN-0101-2009-550-016767133