Time-reversed Lamb waves - Ing, Fink - 1998Ing, R., and M. Fink. 1998. "Time-Reversed Lamb Waves," IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 45(4):1032-1043.R.K.Ing, M.Fink, Time-reversed Lamb waves. IEEE Transactions on Ultrasonics, Ferroelectrics, and ...
Time-reversed Lamb waves 来自 NCBI 喜欢 0 阅读量: 183 作者:Ing, R.K,M Fink 摘要: Lamb waves are extensively involved in plate structure inspection because of their guided nature. However, their dispersive nature often limits their use in flaw detection. In this paper we show that the use...
The FEM analysis was mainly focused on the S0-wave. The indication of the presence of damage is performed using the correlation between the original actuation and the time reversed signal. 展开 被引量: 1 年份: 2013 收藏 引用 批量引用 报错 分享 ...
Lamb waves effectively improve the resolving ability to detect small-sized defect in plate.Finally,by virtue of the time difference between the direct wave and defect echo focusing and mode group velocity of Lamb waves S_0,small-sized defect in plate is accurately located.So,Lamb waves focusing...
Numerical simulations are conducted to study the time reversal behaviour of Lamb wave modes under broadband and narrowband excitations. The results show that the reconstructed time reversed wave exhibits close similarity to the reversed narrowband tone burst signal validating the theoretical model. To ...
In this method, the response signal in the forward path and the reconstructed signal in the time reversed path are both modulated by a weight vector which is obtained as the product of a window function and the reciprocal of amplitude dispersion. The window function varies with the excitation ...
We investigated propagation properties of Lamb waves in GIS tank using time-frequency analysis to diagnose insulation performance of GIS. We measured the acoustic signals excited by a metallic particle colliding with the tank sheath, and those emitted by partial discharge in GIS as well. The Wavelet...
Time-frequency analysis of Lamb waves for distance and thickness measurement.Lamb waves in aluminum plate were analyzed in a time-frequency domain for the improvement of mode identification, the measurement of Lamb wave propagation distance and the measurement of thickness of the plate. The time-...
The invention relates to a large-caliber thick-wall pipeline defect location method based on time-reversal circumferential Lamb waves. According to the method, a defect in a pipeline is regarded as a wave source, and scattered signals generated by interaction of the circumferential Lamb waves and ...
A line focus acoustic transducer is used to excite and detect Lamb waves in a thin plate in order to determine elastic constants. The response of the transducer-couplant-plate system to a pulse with a center frequency of 8 MHz has been simulated, and a preliminary series of corresponding ...