Dispersion curves give information on the wavenumber of individual wave modes for a given frequency-thickness. This information is often determined through numerical solutions, but is possible to determine experimentally. Here, a case study is carried out to separate and reconstruct time-signals of ...
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[43] Yang, et al.(2023). Damage identification for isotropic structures using lamb wave based on a reference-free location imaging method. IEEE Sensors Journal. [44] Yu, et al.(2023). Lamb wave-based damage imaging of cfrp composite structures using autoencoder and delay-and-sum. Composite...
The results show that configuring external permanent magnets improves the signal-to-noise ratio (SNR) of pulse-compressed signals after side lobe suppression when the multi-element Lamb wave EMAT is excited by tone-burst signals. The SNR of the detection echo can be increased by 9.8 dB when th...
Fig.7 Dispersion curves and working point of Lamb waves 搭建实验装置如图8所示。EMAT的激励和信号处理设备为零声科技(苏州)有限公司研制的EMAT-2000便携式电磁超声探伤仪,主要技术参数见表3,参数完全满足实验要求。被测试件为1mm厚的6061铝板。换能器为一发一收,发射接收EMAT的参数完全一致,中心间距为s=200mm。
Investigates the Lamb wave dispersion curves of a bi-layered plate and evaluates the feasibility of using the dispersion data to characterize the material properties of the coating. Measurements of dispersion curves; Information on dispersion curves of coated plates; Inversion of the elastic constants ...
(1):12095-12104.HAYASHIT,ENDOHS.CalculationandvisualizationofLambwavemotion[J].Ultrasonics,2000,38(1):770-773.SANDERSONR.Aclosedformsolutionmethodforrapidcalculationofguidedwavedispersioncurvesforpipes[J].WaveMotion,2015,53:40-50.ZHUKAIGE,FANGDAINING.Calculationofdispersioncurvesforarbitrarywaveguidesusing...
Subsequently, the constrained penalty function algorithm is developed for detecting dispersion curves. Finally, a mode reconstruction algorithm is developed to recover Lamb wave modes. The proposed method can separate overlapping wave modes and detect the crack fault by enhancing the time–frequency ...
This research develops an algorithm which provides excellent localization of Lamb wave dispersion curves while eliminating spurious components. This result is achieved by combining a differential reassignment procedure with non-linear anisotropic diffusion. This study examines the reassignment and diffusion comp...
Lamb waves exhibit conical dispersion at zero wave number when an accidental degeneracy occurs between thickness mode longitudinal and shear resonances of the same symmetry. Here we investigate the propagation of Lamb waves generated at the conical point frequency and the interaction of these waves with...