A5040604865- Thermography and Photoacoustic Techniques
- Non-Destructive Testing Techniques
- Ultrasonics and Acoustic Wave Propagation
- Welding Techniques and Residual Stresses
- Structural Health Monitoring Techniques
- Advanced Measurement and Detection Methods
- Machine Fault Diagnosis Techniques
- Fire effects on concrete materials
- Infrared Target Detection Methodologies
- Engineering Diagnostics and Reliability
- Genetics and Neurodevelopmental Disorders
- Genomic variations and chromosomal abnormalities
- Gear and Bearing Dynamics Analysis
- Plant Physiology and Cultivation Studies
- Magnetic Properties and Applications
- Calibration and Measurement Techniques
- Fault Detection and Control Systems
- Photoacoustic and Ultrasonic Imaging
- Image Processing Techniques and Applications
- Electromagnetic Launch and Propulsion Technology
- Water Quality Monitoring Technologies
- Innovative concrete reinforcement materials
- Water Quality and Pollution Assessment
- Concrete and Cement Materials Research
- Genomics and Rare Diseases
University of Glasgow
2024
Jiangxi University of Technology
2024
Macau University of Science and Technology
2023
Hospital of Hebei Province
2011-2022
Sun Yat-sen University
2022
PLA Academy of Military Science
2020-2021
Newcastle University
2017-2020
Sichuan University
2020
Hebei General Hospital
2019
Soochow University
2010-2015
Eddy current thermography (ECT) as one of the emerging nondestructive testing and evaluation techniques has been used for defects detection in critical components, e.g., fatigue cracks turbine blades, bond wire lift-off IGBT modules, lack fusion welded parts, etc. However, fast inspection using early thermal response, thin eddy penetration depth (skin depth) ferromagnetic materials limits ECT's capability detecting subsurface defects. In order to increase detectable range, this paper...
Long pulse thermography (LPT) is an emerging non-destructive technique that has been used for rapid, cost-effective and accurate damage assessment of composite materials. This paper proposes three analytical models the in-depth evaluation defects in a carbon fibre-reinforced plastic (CFRP) specimen by long thermography. The first two rely on estimate peak temperature-contrast slope from thermal data recorded infrared (IR) camera. Both experimental results showed arriving time depends both...
Eddy current pulsed thermography (ECPT) as one of the emerging nondestructive testing and evaluation (NDT&E) techniques has been used for integrity rail tracks, especially rolling contact fatigue (RCF) detection crack sizing. This paper proposes a probability (POD) analysis framework ECPT system. Specifically, three different features, i.e., max thermal response, first-order differential imaging, ratio mapping were to quantify length angular slot by linear fitting. Based on fitting relation...
Locating and characterizing rolling contact fatigue (RCF) cracks in rails is gaining attention the railway industry. Eddy current pulsed thermography (ECPT) can detect such by combining benefits of electromagnetic excitation thermal diffusion. To date, most studies focus on investigating specific features based artificial defects, verification real lacking. In this article, to establish best means different inclination angles, eight spatial temporal ECPT are evaluated idealized RCF cracks....
As one promising nondestructive testing technique, eddy current pulsed thermography has been used for detecting the defects in rail tracks, e.g., rolling contact fatigue (RCF) cracking. This paper introduces and compares three features pocket length quantification of artificial angular natural RCF cracks. Specifically, maximum thermal response two principal component analysis (PCA)-based (PCA-based pattern PCA-based first-order differential pattern) are utilized to quantify by linear...
Variational mode decomposition (VMD) method has been widely used in the field of signal processing with significant advantages over other methods eliminating modal aliasing and noise robustness. The number (usually denoted by K ) intrinsic function (IMF) a great influence on results. When dealing signals including complex components, it is usually impossible for existing to obtain correct results also effective determining value are lacking. A called center frequency statistical analysis...
Traditional prognostics and health management (PHM) methods for fault detection require complex signal processing manual feature extraction, the accuracy is low. To address these problems, a diagnosis method of planetary gearbox based on deep belief networks (DBNs) proposed. Firstly, vibration signals are collected analyzed in time domain frequency domain. Then, DBN model optimal parameters determined to meet task requirements. Finally, data divided into training set test input model, which...
Eddy current array testing (ECAT) is a useful tool in evaluating defect sizes. However, it difficult for ECAT to evaluate the inner defects ferromagnetic materials due thin skin effect. In this article, direct (dc) magnetization-based (DCMECAT) proposed quantify buried existing surface of steel plates. Relying on permeability disturbance vicinity, DCMECAT can build links between signals and The results show that performance sizes better under saturated magnetization state. Further, three...
Wire ropes (WRs) are widely used in various areas, such as tourist cables, mining, and elevators. Thus, it is very important to detect broken wires (BWs) prevent safety issues. To guarantee the structural health of WRs, this paper proposes use induction thermography (IT) BWs. An image segmentation algorithm based on scale morphology proposed eliminate background influence non-uniform heating visualize Further, area BW region, after binarization, subtraction, filtering, extracted a feature...
To achieve high-speed scanning of defect detection, this paper proposes a motion-induced eddy current (MIEC) thermography method, which utilizes the relative movement between permanent magnet array and inspected object to induce current. Specifically, set circumferentially arranged magnets rotating in steel pipe is used implement proposed method. Numerical simulation experimental studies are conducted investigate MIEC thermal distribution influenced by speed, crack orientation, lift-off...
Preconception care is defined as the promotion of health and well-being a woman her partner before pregnancy. Improving preconception can result in improved reproductive outcomes. China has issued latest version official guideline for 2011. The objective this cross-sectional study to determine whether there variation quality healthcare services distinct eastern northern populations China, what factors are associated with such variation. A survey using our previously developed instrument was...
A significant quantity of tailings is produced during the development different metal mines in China. In particular, fine-grained pose challenges to sustainable mining industry. This study examines utilization finely ground tungsten as a replacement for natural aggregates self-leveling mortar (SLM). The examined impact aggregate-cement ratio, cement mix and varying substitution levels grain sizes on flow properties, mechanical dimensional change rate SLM. Additionally, role SLM was analyzed...
This letter proposes a novel motion-induced eddy current based thermography (MIECT) for high-speed inspection. In contrast to conventional (ECT) on time-varying magnetic field created by an AC coil, the is induced relative motion between and inspected objects. A rotating three-phase windings used investigate heating principle feasibility of proposed method. Firstly, Faraday’s law distribution MIEC investigated, which then validated numerical simulation. Further, experimental studies are...
Detecting surface cracks in ferromagnetic components during the manufacturing process is of critical importance to guarantee high-quality production. Scanning induction thermography (SIT) can be used dynamically scan and identify such cracks. However, testing components, capability SIT characterize crack depths orientations limited under certain operating conditions, as parallel coil, quick detection via early heating. To address these problems, this article proposes use a DC-biased scanning...