Chirp excitation of ultrasonic guided waves
WebAug 24, 2024 · In this research, we attempted to establish a method to evaluate impact damages in mobility structures made of CFRP based on broadband ultrasonic guided … WebJan 20, 2024 · Impact Damage Detection Using Chirp Ultrasonic Guided Waves for Development of Health Monitoring System for CFRP Mobility Structures DOI: License CC BY 4.0 Authors: Langxing Tan The...
Chirp excitation of ultrasonic guided waves
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Webultrasonic guided waves with chirp excitation Ifan Dafydd a and Zahra Sharif Khodaei a a Department of Aeronautics, Imperial College London, South Kensington Campus, SW7 … 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.
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. WebOct 8, 2014 · [8] 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 Scholar [9] Michaels J E, Lee S J, Hall J S and Michaels T E 2011 Multi-mode and multi-frequency guided wave imaging via chirp excitations Proc. SPIE 7984 79840I. Crossref Google Scholar
WebJan 21, 2024 · The virtual time reversal is implemented to back propagate the wave packets corresponding to the desired focusing point and a window function is adopted to adaptively isolate the desired packets from the other components. Then those wave packets are forward propagated to the original focusing point at a constant velocity. WebJul 1, 2024 · The use of guided waves has been previously reviewed for the monitoring and detection of various damages in pipes [8], [9], [10]. GWT has several advantages over the conventional ultrasonic techniques: First, guided waves can travel long distances in the walls of a pipe under test, and thus can improve inspection efficiency [11], [12].
WebPipeline systems are prone to defects due to the harsh service conditions, which may induce catastrophic failure if found not in time. Ultrasonic guided wave (UGW) testing provides a convenient option for pipeline detection, showing high-efficiency, non-contact, long-distance and large-scale capabilities. To address the problem that UGW signals suffer from poor …
WebNov 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 … on shan tay frenchWebAug 23, 2024 · Guided wave excitation signal: ( a) time; ( b) frequency domains, received signal; ( c) time; ( d) frequency domains. The main challenge is to identify small features that might be covered by the current noise level, which makes signal interpretation difficult. onshape accedion shap.comWebNov 30, 2014 · In the experiment, a broadband chirp signal is selected to be the excitation signal which frequency bandwidth is 30–900 kHz, duration time is 100 μs and peak-to … onshape4frcWebMeasurements were recorded for narrowband excitation (5-cycle toneburst with varying carrier frequencies) and broadband excitation (using chirp waveforms). The paper presents the results of a technical validation including numerical modelling, and enables further research, for example related to probability of detection (POD) analysis. ons hantousWebJun 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. onshape 3mfWeb开馆时间：周一至周日7:00-22:30 周五 7:00-12:00; 我的图书馆 ons hand specialist