更新情報
第12回
A Two-Dimensional EMAT Code for Non-Magnetic Materials using a Coupled/Uncoupled Formulation
著者:
Ovidiu MIHALACHE,Daniel GARCIA RODRIGUEZ,Toshihiro YAMAMOTO,Weiying CHENG
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Eddy Currents Electro-Magnetic Acoustic Transducer EMAT Finite Element Ultrasonics
Ovidiu MIHALACHE,Daniel GARCIA RODRIGUEZ,Toshihiro YAMAMOTO,Weiying CHENG
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Eddy Currents Electro-Magnetic Acoustic Transducer EMAT Finite Element Ultrasonics
A previously introduced two-dimensional EMAT (Electro-Magnetic Acoustic Transducer) simulation code developed in-house at JAEA, based on both coupling/uncoupling of eddy currents and wave displacement in a non-magnetic material is analyzed against 3D numerical simulations and experimental wave displacements performed by JAPEIC. The experimental setup visualizes wave propagations along the vertical surface of a stainless steel plate using a piezoelectric sensor, while the 3D simulations were performed u...
英字タイトル:
A Two-Dimensional EMAT Code for Non-Magnetic Materials using a Coupled/Uncoupled Formulation
英字タイトル:
A Two-Dimensional EMAT Code for Non-Magnetic Materials using a Coupled/Uncoupled Formulation
第3回
Numerical Evaluation of ECT Signals of Cracks with Inclination
著者:
Weiying CHENG,Ichiro KOMURA
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Crack Inclination Depth Sizing Eddy Current Testing (ECT) Modeling
Weiying CHENG,Ichiro KOMURA
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Crack Inclination Depth Sizing Eddy Current Testing (ECT) Modeling
Some simplification models are proposed in order to sizing complicated shape defects practically, and the ECT signals of these simplified model cracks are calculated and the difference of ECT signal between the simplified models and i ts perpendicular to conductor surface counterparts is investigated phenomenally. The equivalency of depth sizing of t hese simplified models by using the method for its perpendicular to conductor surface counterparts is discussed also....
英字タイトル:
Numerical Evaluation of ECT Signals of Cracks with Inclination
英字タイトル:
Numerical Evaluation of ECT Signals of Cracks with Inclination
第7回
Simulation for the Assessment of Wall Thinning using Eddy Current Method
著者:
程 衛英,Weiying CHENG,古村 一朗,Ichiro KOMURA
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analytical solution eddy current muti-layered structure pulsed eddy current wall thinning
程 衛英,Weiying CHENG,古村 一朗,Ichiro KOMURA
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analytical solution eddy current muti-layered structure pulsed eddy current wall thinning
A pipe with protective lagging and thermal insulation is modeled by a multi-layered structure. Sinusoidal or sed eddy current are induced by a circular coil held above the structure to measure the thickness of the pipe 11. Analytical solutions of both sinusoidal and pulsed eddy c urrent measurements are deduced. Parameters ecting the measurement are studied using the analytical solutions. Measurement conditions are di scussed ed on the analytical results. Keywords: wall thinning, muti-layered structure, ed...
英字タイトル:
Simulation for the Assessment of Wall Thinning using Eddy Current Method
英字タイトル:
Simulation for the Assessment of Wall Thinning using Eddy Current Method
第5回
パルスECT法による肉厚および導電率測定のシミュレーション
著者:
程 衛英,Weiying CHENG,古村 一朗,Ichiro KOMURA
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conductivity measurement eddy current testing impulse response thickness measurement
程 衛英,Weiying CHENG,古村 一朗,Ichiro KOMURA
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conductivity measurement eddy current testing impulse response thickness measurement
A transient eddy current measurement method is presented to determine the thickness and conductivity of a conductive plate. The conductive plate is induced by an air-cored coil, the magnetic flux density along the axial is measured and the various signals corresponding to plates with dif ferent thickness and conductivity are calculated using a 3D transient eddy current simulator. Characteristic features are obtained from the tran sient response. A similarity-based modeling method is utilized in this study ...
英字タイトル:
Simulation of the Transient Eddy Current Measurement for the Characterization of Depth and Conductivity of a Plate
英字タイトル:
Simulation of the Transient Eddy Current Measurement for the Characterization of Depth and Conductivity of a Plate
第13回
交流誘起プローブによる強磁性体の欠陥検出・評価
著者:
程 衛英,Weiying CHENG
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depth sizing eddy current effect electromagnetic nondestructive testing magnetic flux leakage phase angle
程 衛英,Weiying CHENG
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depth sizing eddy current effect electromagnetic nondestructive testing magnetic flux leakage phase angle
In the low-frequency electromagnetic nondestructive testing of cracks in ferromagnetic structures, both the magnetic flux leakage and eddy current perturbation coexist and the pickup signal is the combination of the two effects: signals arise from flux leakage effects when the crack orients transversal to the flux, and signals arise from eddy current perturbation when the crack orients transversal to the eddy currents. Numerical simulations are carried out to analyze the signals and the phase angles of...
英字タイトル:
Low-Frequency Electromagnetic Testing of Cracks in Ferromagnetic Structures
英字タイトル:
Low-Frequency Electromagnetic Testing of Cracks in Ferromagnetic Structures
第14回
周波数掃引渦電流試験および周波数応答特性解析による金属板厚評
著者:
程 衛英,Weiying CHENG
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phase spectral analysis swept-frequency eddy current testing thickness measurement
程 衛英,Weiying CHENG
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phase spectral analysis swept-frequency eddy current testing thickness measurement
Swept-frequency eddy current testing is applied to measure a metal plate’s thickness. The swept-frequency eddy current testing signals are normalized and spectral analysis was conducted on the normalized impedances. Theoretical and experimental studies show that the extreme value of the normalized impedance is correlated with the plate thickness. The thickness of a non-magnetic plate can be measured by SFECT and spectral analysis on the normalized impedance even without knowing the conductivity of the t...
英字タイトル:
Thickness Measurement of Metal Plates Using Swept-Frequency Eddy Current Testing and Spectral Analysis
英字タイトル:
Thickness Measurement of Metal Plates Using Swept-Frequency Eddy Current Testing and Spectral Analysis
第10回
多次元渦電流信号の活用によるき裂評価
著者:
程 衛英,Weiying CHENG,古川 敬英,Takashi FURUKAWA
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Data Fusion Eddy Current Testing Magnetic Field Sizing
程 衛英,Weiying CHENG,古川 敬英,Takashi FURUKAWA
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Data Fusion Eddy Current Testing Magnetic Field Sizing
The distribution of eddy current is disturbed in the presence of cracks. An equivalent solenoid model and a loop current model were proposed respectively to model the bypasses of eddy currents to the underside and longitudinal end of a crack. Eddy current testing signals were qualitatively analyzed by using the equivalent current models. Simulation showed that the signal due to the bypass of eddy current to the under side of a crack was appropriate for the evaluation of crack depth, and the signal due ...
英字タイトル:
Enhancement of Defect Sizing Ability by ECT Data Fusion
英字タイトル:
Enhancement of Defect Sizing Ability by ECT Data Fusion
論文
渦電流探傷における欠陥形状復元のための新しい信号処理法
著者:
兼本 茂,Shigeru KANEMOTO,程 衛英,Weiying CHENG,志波 光晴,Mitsuharu SHIWA,古村 一朗,Ichiro KOMURA
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Deconvolution Filter Eddy Current Test Line Spread Function Linear Discriminant Analysis Point Spread Function SCC
兼本 茂,Shigeru KANEMOTO,程 衛英,Weiying CHENG,志波 光晴,Mitsuharu SHIWA,古村 一朗,Ichiro KOMURA
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Deconvolution Filter Eddy Current Test Line Spread Function Linear Discriminant Analysis Point Spread Function SCC
This study proposes new signal processing methods to restore surface shapes of flaws from eddy current testing(ECT)signals. A linear discriminant analysis method is applied to ECT signals embedded in multi-dimensional state space to identify flaw signals form background noises in prior. A new concept of equivalent point spread function is introduced, and the real flaw shape is restored by utilizing a deconvolution filter based on Richardson-Lucy algorithm. An EDM notch covered by large welding noises...
英字タイトル:
New Signal Processing Methods for Surface Shape Restoration in Eddy Current
英字タイトル:
New Signal Processing Methods for Surface Shape Restoration in Eddy Current
第3回
渦電流法によるインコネル 600の鋭敏化評価
著者:
内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,阿部 利彦,Toshihiko ABE,程 衛英,Weiying CHENG
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Eddy Current Method Inconel 600 Sensitization
内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,阿部 利彦,Toshihiko ABE,程 衛英,Weiying CHENG
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Eddy Current Method Inconel 600 Sensitization
It is well-known that Cr depletion in Inconel 600 changes its magnetic properties, and there is a possibility that electromagnetic nondestructive evaluation has capability of evaluating sensitization of Inconel 600 quantitatively. In this study, we discuss application of eddy current method to the evaluation. For the purpose, magnetic proper ties of Inconel 600 with different aging times were evaluated by B-H loop analyzer. Results show that some magnetic parameters correlate well with Cr depletion. Focus...
英字タイトル:
Evaluation of Sensitization of Inconel 600 Using Eddy Current Method
英字タイトル:
Evaluation of Sensitization of Inconel 600 Using Eddy Current Method
論文
部分接触SCCの渦電流探傷による新しい深さサイジング法
著者:
兼本 茂,Shigeru KANEMOTO,程 衛英,Weiying CHENG,志波 光晴,Mitsuharu SHIWA,古村 一朗,Ichiro KOMURA
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Depth Sizing Eddy Current Test SCC
兼本 茂,Shigeru KANEMOTO,程 衛英,Weiying CHENG,志波 光晴,Mitsuharu SHIWA,古村 一朗,Ichiro KOMURA
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Depth Sizing Eddy Current Test SCC
A partial-contact stress corrosion crack (SCC) is electrically modeled as a crack region with non-zero conductivity in eddy current testing (ECT). This partial-contact effect is excluded by an optimally designed crack-conductivity-insensitive depth sizing index, and consequently the master curves obtained from electric-discharge machining (EDM) notches can be utilized directly in the depth sizing of SCCs. This approach is numerically validated and applied to the characterization of SCCs in SUS304 from...
英字タイトル:
A New Depth Sizing Method for Partial-Contact Stress Corrosion Cracks from ECT Signals
英字タイトル:
A New Depth Sizing Method for Partial-Contact Stress Corrosion Cracks from ECT Signals