Results 11 to 20 of about 296 (144)

Multiframe Ultrasonic TOFD Weld Inspection Imaging Based on Wavelet Transform and Image Registration [PDF]

Journal of Sensors, Volume 2018, Issue 1, 2018., 2018
TOFD (time of flight diffraction) is a kind of weld defect detection technology by using ultrasonic diffraction wave signal. Because the diffraction intensity is far less than ultrasonic echo wave intensity, thus, the noise contained in TOFD signal is fairly large, and the formed image is not clear enough.
Jiaxu Duan, Lin Luo, Xiaorong Gao, Jianping Peng, Jinlong Li, Jaime Lloret   +5 more
wiley   +2 more sources

CIVA Confirmation of Frequency Dependence of TOFD Lateral Wave

e-Journal of Nondestructive Testing
Pulse-duration (ring-time) of the TOFD (Time of Flight Diffraction) lateral wave has been assumed to be based on the nominal frequency of the probe. With the improved damping used for TOFD applications, these probes now have had their ring-time reduced ...
Edward Ginzel, Edward Ginzel
doaj   +2 more sources

CIVA as an Aid to Understanding TOFD Dead Zones

e-Journal of Nondestructive Testing
TOFD (Time of Flight Diffraction) has been a popular ultrasonic testing method for many years. It has associated with it, limitations associated with the pulse duration.
Edward Ginzel
doaj   +2 more sources

Large‐scale system identification using self‐adaptive penguin search algorithm

IET Control Theory &Applications, Volume 17, Issue 17, Page 2292-2303, November 2023., 2023
This research addresses the non‐linear large‐scale system identification problem under the consideration of two systems: bilinear system and Volterra system as the large‐scale system identification. This work proposes a novel algorithm, called Self Adaptive Penguin Search Optimization (SAPeSO), to attain the system characteristics properly and minimize
Karthikeyan Udaichi, Ravi Chinaveer Nagappan, Miguel Garcia‐Torres, Parameshchari Bidare Divakarachari, Shankar Nayak Bhukya   +4 more
wiley   +1 more source

Applicability Analysis of Inspection and Monitoring Technologies in Wind Turbine Towers

Shock and Vibration, Volume 2021, Issue 1, 2021., 2021
Wind turbines are one of the key systems in wind energy development. The wind tower supporting the whole wind turbine is a towering structure, which has been affected by installation, transportation, environment, and other factors. Furthermore, it is prone to experience other quality problems that would be difficult to detect for wind turbine towers ...
Yanchao Yue, Jingjing Tian, Yongtao Bai, Kai Jia, Jian He, Dong Luo, Tangbing Chen, Chengwei Fei   +7 more
wiley   +1 more source

Système de contrôle novateur basé sur la technique UT TOFD

e-Journal of Nondestructive Testing, 2023
Du fait de ses nombreux avantages en termes de facilité de mise en oeuvre, de vitesse d’examen, de performances de détection et de caractérisation des indications, la technique de contrôle TOFD (Time of Flight Diffraction) est de plus en plus utilisée ...
Michel Cence, Weina Ke, Celia Chevallier
doaj   +1 more source

Multi-Mode Total Focusing Method (MTFM) to Detect High-Temperature Hydrogen Attack (HTHA) – A Review

Journal of Materials Exploration and Findings, 2023
High temperature hydrogen attack (HTHA) is a commonly observed harm component in carbon steels exposed to high temperature and pressure in a hydrogen-rich environment. Hydrogen together with carbon responds to produce methane.
Anjar Oktikawati, Rini Riastuti, Nursidi Yuanto   +2 more
doaj   +1 more source

Time of flight diffraction for rough planar defects [PDF]

, 2021
Ultrasonic non-destructive evaluation techniques, such as time-of-flight diffraction (ToFD) for which the arrival times of waves diffracted from crack tips are analysed to locate and size defects, are well understood for smooth defects.
Lowe, Michael J.S., Lowe, Michael JS, Haslinger, Stewart G, Shi, Fan, Haslinger, Stewart G., Wang, Zhengjun   +5 more
core   +1 more source

Research progress in ultrasonic testing for friction stir welding of aluminum alloy

Cailiao gongcheng, 2022
The defects in friction stir welding (FSW) of aluminum alloy, e.g., tunnel defect, lack of penetration (LOP) and kissing bond, are with complex shape and narrow gap by inappropriate welding parameters.
JIN Shijie, TIAN Xin, LIN Li
doaj   +1 more source

Resolution Enhancement in Ultrasonic TOFD Imaging by Combining Sparse Deconvolution and Synthetic Aperture Focusing Technique (Sparse-SAFT)

Chinese Journal of Mechanical Engineering, 2022
The shallow subsurface defects are difficult to be identified and quantified by ultrasonic time-of-flight diffraction (TOFD) due to the low resolution induced by pulse width and beam spreading.
Xu Sun, Li Lin, Shijie Jin
doaj   +1 more source