A5084458302- Ultrasonics and Acoustic Wave Propagation
- Non-Destructive Testing Techniques
- Geophysical Methods and Applications
- Seismic Waves and Analysis
- Underwater Acoustics Research
- Seismic Imaging and Inversion Techniques
- Numerical methods in engineering
- Structural Health Monitoring Techniques
- Acoustic Wave Phenomena Research
- Optical measurement and interference techniques
- Advanced Sensor and Energy Harvesting Materials
- Electromagnetic Simulation and Numerical Methods
- Advanced Numerical Methods in Computational Mathematics
- Acoustic Wave Resonator Technologies
- Metamaterials and Metasurfaces Applications
- Vibration and Dynamic Analysis
- Thermography and Photoacoustic Techniques
- Probabilistic and Robust Engineering Design
- Advanced MEMS and NEMS Technologies
- Conducting polymers and applications
- GaN-based semiconductor devices and materials
- Noise Effects and Management
- Gas Sensing Nanomaterials and Sensors
- Material Properties and Failure Mechanisms
- Fatigue and fracture mechanics
Hong Kong University of Science and Technology
2019-2025
University of Hong Kong
2019-2025
Ningbo University
2024
Nanjing University of Posts and Telecommunications
2023
Northeastern University
2022-2023
Xi'an University of Science and Technology
2021-2022
Imperial College London
2014-2019
UK Energy Research Centre
2014
Georgia Institute of Technology
2012-2013
East China Normal University
1999
Spatially distributed arrays of piezoelectric disks are being applied to monitor structural integrity using Lamb waves. Applied loads directly affect waves propagating between array elements because dimensional changes and the acoustoelastic effect. Resulting in phase velocity depend upon propagation direction as well wave mode frequency. This paper shows from numerical solutions equation for an isotropic plate that it is possible decouple effects a homogeneous biaxial stress into its two...
We investigate robust large-area elastic transverse wave propagation in an actively tunable membrane-type acoustic metamaterial. The waveguide with multiple degrees of freedom to control the width interface mode is realized by designing a heterostructure including three domains. One central domain constructed periodic unit cells ordinary state, where Dirac cone can be observed band structure. other two domains consist possessing opposite valley Chern numbers, respectively. By employing...
Non-invasive characterization and monitoring of gas evolution during the operation commercial Li-ion batteries (LIBs) has been a long-term challenge. This paper presents an in situ subsurface ultrasonic array imaging method to detect, locate, characterize gases generated inside LIB. Ultrasonic signals scattered from internal are collected by full matrix capture method. A cross-section image showing is produced using velocity-modified total focusing The locations distribution both lateral...
Abstract With substantial advances in materials science and electronics, flexible tactile sensors have emerged as a promising sector with extensive applications, notably human‐machine interactions. However, achieving large‐area sensing few units at low cost remains challenge; the use of sensor arrays will complicate wiring increase costs. To solve these issues, sandwich Miura‐ori (SMo)‐enabled super‐resolution skin capable resolving normal shear forces is proposed, theoretical model that...
Collaborative robots need to work with people in shared spaces interactively, so a robotic e‐skin large‐area contact sensing capability is crucial technology ensure human safety. However, realizing real‐time localization and intensity estimation on robot body large area of continuous complex surfaces challenging. Herein, novel conformal Kirigami structure that can be customized for geometries transform small‐area planar sensor arrays into curved proposed. This network effectively detect...
The subject of this paper is dynamic analysis Micro-Electro-Mechanical Systems (MEMS). MEMS are integrated, movable microstructures with electronics, in the 0⋅1–1000 μm size range. Dynamic complicated by fact that there two physical domains, electrical and mechanical, non-linear coupling between them. Numerical simulation dynamics carried out a hybrid BEM/FEM (Boundary Element Finite Method) approach, FEM for structure BEM electrostatic analysis. Several numerical techniques proposed...
In this paper, we consider the simulation of microelectromechanical structures (MEMS). The objective work is to develop reliable numerical procedures that will help improve our understanding MEMS behaviors, and enable optimal design MEMS. A hybrid FEM-BEM method developed solve coupled electrostatics mechanics equations. Sensitivity analysis carried out using direct differentiation approach (DDA) compute sensitivity coefficients (DSCs). DSCs can then be used drive optimization procedures....
The Kirchhoff approximation (KA) for elastic wave scattering from two-dimensional (2D) and three-dimensional (3D) rough surfaces is critically examined using finite-element (FE) simulations capable of extracting highly accurate data while retaining a fine-scale surface. FE approach efficiently couples time domain solver with boundary integration method to compute the scattered signals specific realizations surfaces. Multiple random whose profiles have Gaussian statistics are studied by both...
Time-of-flight diffraction (ToFD) is a widely used ultrasonic nondestructive evaluation (NDE) method for locating and characterizing rough defects, with high accuracy in sizing smooth cracks. However, naturally grown defects often have irregular surfaces, complicating the received tip waves affecting of defect characterization. This article proposes self-attention (SA) deep learning to interpret ToFD A-scan signals defects. A high-fidelity finite-element (FE) simulation software Pogo...
Abstract Computing the charge density on surfaces of conductors is fundamental to many electrostatic applications. Difficulties arise in two‐dimensional simulation due O(log|r|) potential. Fully understanding 2D potential problem, and reasonably connecting mathematical formulation with physical interpretation, are key handling this difficulty properly. In absence these factors it easy for one propose an ill‐posed problem. paper, a complete investigation theory, from 3D 2D, made computing...
Elastic waves scattered by random rough interfaces separating two distinct media play an important role in modeling phonon scattering and impact upon thermal transport models, are also integral to ultrasonic inspection. We introduce theoretical formulas for the diffuse field of elastic by, transmitted across, solid-solid using elastodynamic Kirchhoff approximation. The new validated comparison with numerical Monte Carlo simulations, a wide range roughness (rms...