A5024017886- Ultrasonics and Acoustic Wave Propagation
- Non-Destructive Testing Techniques
- Geophysical Methods and Applications
- Thermography and Photoacoustic Techniques
- Structural Health Monitoring Techniques
- Advanced Aircraft Design and Technologies
- Guidance and Control Systems
- Flow Measurement and Analysis
- Optical Systems and Laser Technology
- Spacecraft Design and Technology
- Seismic Waves and Analysis
- Adaptive Control of Nonlinear Systems
- Fluid Dynamics and Turbulent Flows
- Geotechnical Engineering and Underground Structures
- Aerospace Engineering and Control Systems
- Wind Energy Research and Development
- Aerospace Engineering and Energy Systems
- Structural Analysis and Optimization
- Lightning and Electromagnetic Phenomena
- Photoacoustic and Ultrasonic Imaging
- Electrical Fault Detection and Protection
- Advanced Optical Sensing Technologies
- Combustion and Detonation Processes
- Aerodynamics and Fluid Dynamics Research
- Industrial Vision Systems and Defect Detection
Korea Advanced Institute of Science and Technology
2023-2024
Universiti Putra Malaysia
2014-2021
Weatherford College
2021
Jeonbuk National University
2008-2012
Chonbuk National University Hospital
2010
The direct attachment of piezoelectric transducers onto hot targets raises formidable challenges as lose their characteristics at elevated temperatures or debond due to thermal expansion coefficient mismatches. We developed a welded fibre acoustic-wave PZT (FAWPZT) sensor alleviate these temperature limitations. One end the FAWPZT sensor, made from stainless steel fibre, was target plate and other bonded sensor. An ultrasonic wave propagation imaging (UWPI) system consists laser mirror...
This article presents a baseline-free, model-driven, statistical damage detection and imaging framework for guided waves measured from partial (i.e. non-dense) wavefield scans. Wavefield analysis is an effective non-contact technique non-destructive evaluation. Yet, there are several limitations to practically implement methods. These include slow data acquisition lack of reliability. Our approach addresses both these challenges. We use sparse wavenumber analysis, synthesis, data-fitting...
Abstract Imaging plays a vital role in enabling the visualization and analysis of objects phenomena across various scientific disciplines industrial sectors, spanning wide range length time scales. This roadmap presents critical overview thirteen imaging techniques, which are organized into three thematic sections according to their applicability either solid, fluid, or both solid fluid targets. The objectives this highlight challenges provide perspectives for next-generation systems, can...
An ultrasonic propagation imaging (UPI) system consisted of a Q-switched Nd-YAG pulsed laser and galvanometer mirror scanner was developed. The which requires neither reference data nor fixed focal length could be used for health monitoring curved structures. If combined with fiber acoustic wave PZT (FAWPZT) sensor, it to inspect hot target structures that present formidable challenges the usage contact piezoelectric transducers mainly due operating temperature limitation debonding problem...
Incipient thermal damage (ITD) in polymer-matrix composites could cause substantial loss of material properties and it is notoriously difficult to be detected using nondestructive evaluation (NDE) techniques. The emerging ultrasonic propagation imaging (UPI) the solution for detection problem its probability ITD was studied this work. Glass fiber reinforced epoxy plate specimens insulted at temperatures ranging between 1.1 1.7 times glass transition temperature (Tg) duration 5 30 min were...
Wavefield acquisition is a powerful visualization tool for studying wave propagation. Yet, without baseline, damage challenge because the wavefield usually orders of magnitude weaker than incident waves. Researchers have created several baseline-free approaches suppressing waves, but these methods often rely on simple assumptions. We address this with dictionary learning framework that uses simulation data to guide suppression Dictionary produces new baselines geometric features similar...
The inability to statistically evaluate the damage size based on amplitude mapping has long plagued ultrasound propagation imaging (UPI) system and related non-destructive evaluation (NDE) community. This paper proposes a visualization method called Statistically Thresholded Anomaly Mapping (STAM) solve this problem. It could isolate damage-induced anomalous waves from an ultrasonic full wavefield data, map their amplitudes into image differentiate background noise pristine region of...
Joints in aero-mechanical structures are critical elements that ensure the structural integrity but they prone to damages. Inspection of such joints have no prior baseline data is really challenging it can be possibly done using Ultrasonic Propagation Imager (UPI). The feasibility applying UPI for detection loosened fastener investigated this study. A simple lap joint specimen made by connecting two pieces 2.5mm thick SAE304 stainless steel plates five M6 screws and nuts has been used All...
Soundness of wind turbine blade plays paramount role in supplying cheap and reliable energy. To ensure that blades are sound free from inherent manufacturing defects, easy quality evaluation before delivering for installation is crucial. We propose an ultrasonic amplitude imaging method based on Ultrasonic Propagation Imaging (UPI) system this purpose. The utilizes a scanning Q-switched continuous wave laser as generator. Various acousto-ultrasonic sensors, either contact or non-contact...
Arcing effects, such as that due to lightning, on glass fiber reinforced epoxy composite laminate used in aerospace applications, have been studied. Lightning voltage impulses (1.2/50 micro seconds) were applied at breakdown the specimens and arc points inspected nondestructively using an Ultrasonic Propagation Imaging (UPI) system. The data acquired processed Statistically Thresholded Anomaly Mapping (STAM) method. outcomes depict size of lightning penetration damage is proportional...
This paper describes the effect of surface roughness when applied on helicopter main rotor blade. The aim is to prove that can be used as a simple and inexpensive method achieve better flight performance such enhanced thrust and/or reduced power requirement. research was done experimentally, using scaled model Eurocopter AS350 Ecureuil. Smooth profile blade modified by applying upper lower camber in transition turbulent boundary layer region, starting from 25% chord length extending up...