Shape Reconstruction of Plate Thinning Using Reflection Coefficients of Ultrasonic Lamb Waves : a Numerical Approach
スポンサーリンク
概要
- 論文の詳細を見る
This paper presents an inverse method for the shape reconstruction of local surface-thinning flaws on a 2-D isotropic plate using ultrasonic guided Lamb waves. The problem considered is to determine the function representing a plate thinning shape from reflection coefficients of Lamb waves obtained over a range of frequency, when a single Lamb wave mode is incident upon the thinning part in a plate. The formulation is based on the integral expression of scattered waves by flaws in a plate. Introducing the far field approximation and Born approximation into the integral expression, we obtain the Fourier transform pair between the shape function of plate thinning and reflection coefficients in frequency domain. Thus the shape of a plate-thinning flaw can be reconstructed by performing the inverse Fourier transform of reflection coefficients of Lamb waves with respect to frequency. Some numerical examples are illustrated to show the validity and effectiveness of the inverse approach. Reflection coefficients of the first symmetric Lamb wave mode are calculated by a forward analysis, and are used for the inverse analysis. It is found that although the reconstructed flaw shapes do not perfectly agree with the original shapes due to the approximations induced in the inverse approach, the flaw location and depth are well estimated if the frequency range for the inverse Fourier transform is chosen properly, corresponding to the flaw configurations.
- The Iron and Steel Institute of Japanの論文
- 2012-07-15
著者
-
Wang Bin
Department Of Chemistry Marshall University
-
Hirose Sohichi
Department Of Mechanical And Environmental Informatics Graduate School Of Information Science And Engineering Tokyo Institute Of Technology
関連論文
- Properties of Variable-Focus Liquid Crystal Lens and Its Application in Focusing System
- Liquid Crystal Negative Lens
- 3C04 Converting Fixed Focus Lens to Variable-Focus Lens Using Liquid Crystal Layers
- Liquid Crystal Lens With Spherical Electrode
- 3A16 Study of a Novel Liquid Crystal Lens
- Novel Method for Pretilt Angle Measurement Using Liquid Crystal Lens Cell with Hybrid Alignment
- 3D12 Study of the Molecular Alignment and Optical Properties of a Liquid Crystal Lens
- Transverse Surface Waves in a Functionally Graded Substrate Carrying a 6mm Piezoelectric Material Layer
- PREFACE
- Variable-Focus Liquid Crystal Lenses Used in Imaging Systems as Focusing Elements
- Potential Predictability of Tropical Low-level Circulation in CWB GFS Ensemble Hindcast
- Correlation of Risser Sign, Radiographs of Hand and Wrist With the Histological Grade of Iliac Crest Apophysis in Girls With Adolescent Idiopathic Scoliosis
- The Left Thoracic Curve Pattern : A Strong Predictor for Neural Axis Abnormalities in Patients With "Idiopathic" Scoliosis
- Trehalose Is an Important Mediator of Cap1p Oxidative Stress Response in Candida albicans(Microbiology)
- Reflection of Obliquely Incident Guided Waves by an Edge of a Plate
- 3B11 Pretilt Measurement Using Hybrid Alignment Liquid Crystal Lenses
- Stability and Structure Studies on Alisol A 24-Acetate
- SPE-HPLC method for the determination of four flavonols in rat plasma and urine after oral administration of Abelmoschus manihot extract
- Flavonoids from Millettia nitida var. hirsutissima
- New Triterpenoid Saponins from Stelmatocrypton khasianum
- Bufalin Inhibits Platelet-Derived Growth Factor-BB-Induced Mesangial Cell Proliferation through Mediating Cell Cycle Progression
- Reducing Driving Voltages for Liquid Crystal Lens Using Weakly Conductive Thin Film
- Image Formation Using Liquid Crystal Lens
- Aberration Measurements of a Liquid Crystal Lens Prepared Using a Glass Lens and Liquid Crystal Layers
- Properties of Liquid Crystal Lens with Stacked Structure of Liquid Crystal Layers
- Study of Liquid Crystal Lens with Focus Movable in Focal Plane by Wave Front Analysis
- Double-Layer Liquid Crystal Lens
- Inhibition of Human Cytomegalovirus Infection by IE86-Specific Short Hairpin RNA-Mediated RNA Interference
- Effect of Inducible Expressed Human Cytomegalovirus Immediate Early 86 Protein on Cell Apoptosis
- Hsa-mir-27a genetic variant contributes to gastric cancer susceptibility through affecting miR-27a and target gene expression
- Simultaneous determination and pharmacokinetic studies of dihydromyricetin and myricetin in rat plasma by HPLC-DAD after oral administration of Ampelopsis grossedentata decoction
- AutoCAD Add-on for Simplified Design of Microfluidic Devices
- Some Aspects of QCD Phase Transitions in Dense Strong Interaction Matter in Dyson-Schwinger Equation Approach(Hadrons at finite density)
- Ultrasonic Imaging of Concrete by Synthetic Aperture Focusing Technique Based on Hilbert-Huang Transform of Time Domain Data
- Berberine Inhibits Growth and Induces G1 Arrest and Apoptosis in Human Cholangiocarcinoma QBC939 Cells
- Image Based EFIT Simulation for Nondestructive Ultrasonic Testing of Austenitic Steel
- Shape Reconstruction of Plate Thinning Using Reflection Coefficients of Ultrasonic Lamb Waves : a Numerical Approach
- Driving of Liquid Crystal Lens without Disclination Occurring by Applying In-Plane Electric Field