Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Wenfa Zhu"'
Autor:
Xingjie Chen, Wenfa Zhu, Guopeng Fan, Zaiwei Li, Wei Shao, Xiangzhen Meng, Liming Li, Haiyan Zhang
Publikováno v:
International Journal of Distributed Sensor Networks, Vol 16 (2020)
Void defects under track slabs are the main danger affecting the safe operation of high-speed railways. In the short high-speed railway maintenance periods, China’s high-speed railway line maintenance operations must quickly and dynamically determi
Externí odkaz:
https://doaj.org/article/68969936474d41bd9e198e3ff6f26215
Publikováno v:
Sensors, Vol 20, Iss 3, p 775 (2020)
This paper describes an imaging method for near-field defect detection in aluminum plates based on Green’s function recovery and application of instantaneous phase coherence weighting factors. The directly acquired acoustic information of near-fiel
Externí odkaz:
https://doaj.org/article/a532154e05e24c7d911952b5d3e3418c
Publikováno v:
Metals, Vol 9, Iss 8, p 868 (2019)
In this paper, phase coherence imaging is proposed to improve spatial resolution and signal-to-noise ratio (SNR) of near-surface defects in rails using cross-correlation of ultrasonic diffuse fields. The direct signals acquired by the phased array ar
Externí odkaz:
https://doaj.org/article/de3976b6ae7b4551913fd7abe8d7f538
Publikováno v:
Sensors, Vol 19, Iss 17, p 3744 (2019)
Wavenumber imaging with Green’s function reconstruction of ultrasonic diffuse fields is used to realize fast imaging of near-surface defects in rails. Ultrasonic phased array has been widely used in industries because of its high sensitivity and st
Externí odkaz:
https://doaj.org/article/0bdec0215d35490a8c87634349e85fcc
Publikováno v:
Metals, Vol 9, Iss 6, p 666 (2019)
Ultrasonic phased array is widely used for damage detection recently because of its high sensitivity and rapid scanning without sensor movements. However, the measured signal is always influenced by the remnants of the initial excitation and the nonl
Externí odkaz:
https://doaj.org/article/f2c352a25836486e95c2128aefc88519
Publikováno v:
Metals, Vol 9, Iss 5, p 503 (2019)
The ultrasonic phased array total focusing method (TFM) has the advantages of high imaging resolution and high sensitivity to small defects. However, it has a long imaging time and cannot realize near-distance defect imaging, which limits its applica
Externí odkaz:
https://doaj.org/article/4dbfc0477e8d4530bc780419e77a6666
Publikováno v:
Applied Sciences, Vol 8, Iss 9, p 1600 (2018)
This paper aims to use the Lamb wave local wavenumber approach to characterize flat bottom defects (including circular flat bottom holes and a rectangular groove) in an isotropic thin plate. An air-coupled transducer (ACT) with a special incidence an
Externí odkaz:
https://doaj.org/article/8d7a12e5462140969934f1d2906c5df4
Publikováno v:
Insight: Non-Destructive Testing & Condition Monitoring; May2024, Vol. 66 Issue 5, p272-286, 10p
Publikováno v:
Insight: Non-Destructive Testing & Condition Monitoring. Apr2020, Vol. 62 Issue 4, p208-215. 8p. 1 Color Photograph, 6 Diagrams, 2 Charts, 11 Graphs.