Chirp excitation of ultrasonic guided waves
WebJun 1, 2015 · [16] Michaels J E, Lee S J, Croxford A J and Wilcox P D 2013 Chirp excitation of ultrasonic guided waves Ultrasonics 53 265-70. Crossref; Google … WebJul 9, 2015 · The dispersion of ultrasonic guided waves causes the energy of a signal to spread out in space and time as it propagates, which decreases the performance for damage detection significantly. A...
Chirp excitation of ultrasonic guided waves
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WebJan 25, 2024 · To control the desired mode in multi-mode ultrasonic guided waves, excitation optimization and weighted gathering are carried out by the analysis of the semi-analytical finite element (SAFE) method and the normal mode expansion (NME) method. WebSep 25, 2024 · A linear chirp signal from 20 to 200 kHz with 1 ms duration is used as excitation, and the response is acquired for 2 ms with an appropriate delay corresponding to the fastest signal component arrival. The proposed EOC compensation method is not applied for the initial test.
WebApr 11, 2024 · Figure 1 (a) represents the ultrasound-guided ESWT transducer integrating with therapeutic and diagnostic imaging probes. As illustrated in Fig. 1 (a), a therapeutic probe is located in the outer ring while an imaging probe is located in the center. Therefore, it enables simultaneous treatment and imaging at the same spatial coordinate in real … As an example of a broadband chirp excitation, consider the chirp signal … The output chirp voltage from the power amplifier (typically 300 V p–p) was first … Thirty-six “embolic” events were recorded from a flow phantom. The flow phantom … The pulse echo technique is carried out by sending frequency modulated chirp … For all experiments, the angles of inclination of the sending transducer is equal to …
WebJun 1, 2024 · Two types of signals were used for guided wave excitation, namely chirp signal and tone-burst signal. The chirp signal had a frequency range of 20–500 kHz. The tone-burst signals had a form of sine modulated by Hann window with 5 cycles and carrier frequencies 16.5 kHz, 50 kHz, 100 kHz, 200 kHz, 300 kHz. WebChirp excitation of ultrasonic guided waves. / Michaels, Jennifer E.; Lee, Sang Jun; Croxford, Anthony J. et al. In: Ultrasonics, Vol. 53, No. 1, 01.2013, p. 265-270. …
WebDec 1, 2024 · Use the chirp signal as excitation and extract the narrowband tone burst response y ( t) at the appropriate center frequency. Choosing the center frequency involves Lamb wave mode selection. Lamb waves are multimodal, which means that there are at least two modes at any frequency.
WebJan 22, 2024 · A framework based on a comparative analysis of signals was developed. For the first specific aim, the effectiveness of features based on statistical condition indicators of the sensor signals were evaluated. For the second specific aim, actuator-sensor signal pair were analyzed using cross-correlation to extract two features. implicitly defined functionsWebNov 18, 2024 · The tests are usually conducted in pulse-echo mode, whereby pulsed ultrasonic guided waves are generated and transmitted along a structure in which presence of discontinuities is revealed... implicitly detached 10WebNov 1, 2011 · Noncontact, high-resolution ultrasonic imaging of wood samples using coded chirp waveforms T. Gan , D. Hutchins , R. Green , M. K. Andrews , P. Harris … literacy groups posterWebA whole group of nondestructive measurements includes methods using guided wave. A method was shown in where a compressed chirp signal for guided wave allowed the excitation of long-range waves. These, in turn, allowed for the identification of the level of anchorage even when the wave energy leaked from the anchor into the surrounding rock ... implicitly implementedWebDec 5, 2024 · The Lamb wave inspection has emerged as a promising method for structural health monitoring and nondestructive testing. However, because of the highly dispersive and multimodal features, the Lamb wave mode separation has become a challenging problem. implicitly impliedWebSep 25, 2024 · The proposed UT method uses multi-mode and broadband guided ultrasonic waves in the pipe walls, excited and received by single-element ultrasonic … literacy groups near meWebAug 24, 2024 · Parametric signal representation techniques with Chirplet models have attracted much attention in ultrasonic guided waves-based research of material property identification and structural integrity evaluation. The known Chirplet models are established using either the Gaussian windows or the linear chirp function. implicitly imply