更新情報
第16回
EMATによる超音波の送受信に関する電磁相互作用を考慮したFEMシミュレーション
著者:
山本 敏弘,(発電技検),浦山 良一,(東北大),古川 敬,(発電技検),高木 敏行,(東北大)
発刊日:
公開日:
キーワードタグ:
electromagnetic transducer EMAT FEM finite element method simulation
山本 敏弘,(発電技検),浦山 良一,(東北大),古川 敬,(発電技検),高木 敏行,(東北大)
発刊日:
公開日:
キーワードタグ:
electromagnetic transducer EMAT FEM finite element method simulation
The purpose of this study is to establish a computational procedure to support the optimization of an EMAT configuration. In this study, computer simulations were performed to obtain the propagation behavior of ultrasonic waves generated by an EMAT and the signals received with an EMAT. The simulation results were compared with the corresponding experimental results to validate the simulation method. The simulation results reasonably matched the corresponding experimental results....
英字タイトル:
FEM simulation with consideration of electromagnetic interaction for transmitting and receiving ultrasonic waves with an EMAT
英字タイトル:
FEM simulation with consideration of electromagnetic interaction for transmitting and receiving ultrasonic waves with an EMAT
第10回
ねじりモードガイド波を用いた複数のエルボ越え探傷の数値解析
著者:
古川 敬,Takashi FURUKAWA,山本 敏弘,Toshihiro YAMAMOTO,金原 了二,Ryouji KANEHARA,池田 隆,Takashi IKEDA
発刊日:
公開日:
キーワードタグ:
Elbow FEM Guided Wave Piping Wave Propagation
古川 敬,Takashi FURUKAWA,山本 敏弘,Toshihiro YAMAMOTO,金原 了二,Ryouji KANEHARA,池田 隆,Takashi IKEDA
発刊日:
公開日:
キーワードタグ:
Elbow FEM Guided Wave Piping Wave Propagation
Abstract Ultrasonic guided waves have been widely applied to the long-range inspection of straight piping. Guided waves have many wave modes with different sound velocity. So, ultrasonic testing beyond welds and elbows is very difficult to interpret testing data. This paper reports the simulation and visualization of guided wave propagation via a large-scale 3D FEM code, which has over one billion elements and parallel computing system. The prediction of torsional guided wave propagation and reflected ...
英字タイトル:
Numerical simulation of torsional-mode guided wave inspection beyond elbows
英字タイトル:
Numerical simulation of torsional-mode guided wave inspection beyond elbows
第6回
上置コイルによるリモートフイールド渦電流探傷法の改良
著者:
山本 敏弘,Toshihiro YAMAMOTO,高木 敏行,Toshiyuki TAKAGI,内一 哲哉,Tetsuya UCHIMOTO
発刊日:
公開日:
キーワードタグ:
Eddy current testing Local wall thinning Pancake coil Remote field
山本 敏弘,Toshihiro YAMAMOTO,高木 敏行,Toshiyuki TAKAGI,内一 哲哉,Tetsuya UCHIMOTO
発刊日:
公開日:
キーワードタグ:
Eddy current testing Local wall thinning Pancake coil Remote field
We are developing remote filed eddy current testing (RFECT) method using pancake coils for evaluating local wall thinn ing of large diameter pipes. This paper shows a study to improve the detectability and sizing capability of this RFECT method. The study was performed by numerical calculations and laboratory experiments. The results show that introduci ng differential pick-up coils makes detection signals more stable and improves the detectability of our RFECT method....
英字タイトル:
Improvement of remote field eddy current testing using pancake coils
英字タイトル:
Improvement of remote field eddy current testing using pancake coils
第5回
信号位相を利用したECT信号からのき裂指示の抽出
著者:
山本 敏弘,Toshihiro YAMAMOTO,八島 建樹,Kenji YASHIMA,高木 敏行,Toshiyuki TAKAGI,内一 哲哉,Tetsuya UCHIMOTO
発刊日:
公開日:
キーワードタグ:
crack detection eddy current testing multi-coil probe noise reduction
山本 敏弘,Toshihiro YAMAMOTO,八島 建樹,Kenji YASHIMA,高木 敏行,Toshiyuki TAKAGI,内一 哲哉,Tetsuya UCHIMOTO
発刊日:
公開日:
キーワードタグ:
crack detection eddy current testing multi-coil probe noise reduction
This paper shows phase characteristics of crack indications obtained with a multi-coil ECT probe, and proposes a method to reduce noise and extract crack indications from the detection signals of this multi-coil ECT p robe based on these phase characteristics. Because this multi-coil ECT probe performs two kinds of scanning patterns: U-scan and T-scan, and obtains two sets of signal distributions for one scanning area simultaneousl y, the proposed method uses a two-stage process that includes so-called a m...
英字タイトル:
Extraction of crack indications from ECT signals by using signal phase characteristics
英字タイトル:
Extraction of crack indications from ECT signals by using signal phase characteristics
第17回
垂直UTによる欠陥検出を例にした機械学習結果の解釈技術の調査
著者:
山本 敏弘,(発電技検)
発刊日:
公開日:
キーワードタグ:
AI deep learning interpretation machine learning normal beam ultrasonic testing UT
山本 敏弘,(発電技検)
発刊日:
公開日:
キーワードタグ:
AI deep learning interpretation machine learning normal beam ultrasonic testing UT
A machine learning model is required to be interpretable for making its decision accepted by people. SHAP (Shapley Additive exPlanations) is a tool to show how much each of the features used for training a machine learning model contributes its decision. This paper shows an application of SHAP on a deep learning model for defect detection by normal beam UT as an example of nondestructive inspection problems....
英字タイトル:
Study on an interpretation technique for machine learning results with an example of defect detection by normal beam UT
英字タイトル:
Study on an interpretation technique for machine learning results with an example of defect detection by normal beam UT
第9回
沿岸立地構造物塩害評価及び対策
著者:
滝下 貴行,Takayuki TAKISHITA,中安 文男,Fumio NAKAYASU,来馬 克己,Katsumi KURUBA,梅原 敏弘,Toshihiro UMEHARA,野村 満幸,Mitsuyuki NOMURA,山本 裕之,Hiroyuki YAMAMOTO
発刊日:
公開日:
キーワードタグ:
Corrosion Corrosion evaluation Nuclear spent fuel storage facility Sea salt aerosol
滝下 貴行,Takayuki TAKISHITA,中安 文男,Fumio NAKAYASU,来馬 克己,Katsumi KURUBA,梅原 敏弘,Toshihiro UMEHARA,野村 満幸,Mitsuyuki NOMURA,山本 裕之,Hiroyuki YAMAMOTO
発刊日:
公開日:
キーワードタグ:
Corrosion Corrosion evaluation Nuclear spent fuel storage facility Sea salt aerosol
Nuclear spent fuel intermediate storage facility is planned to be located in the Sea of Japan coast area. Therefore, there is risk of structure corrosion by sea salt aerosol. This study is the co rrosion risk evaluation and it's countermeasure of that facility....
英字タイトル:
Evaluation of Salt Damage Structure Located in the Coastal
英字タイトル:
Evaluation of Salt Damage Structure Located in the Coastal
第16回
超音波可視化技術および数値解析を用いた焦点型電磁超音波探触子の評価
著者:
手塚 晃世,(東北大),山本 敏弘,(発電技検),孫 宏君,浦山 良一,内一 哲哉,高木 敏行,(東北大)
発刊日:
公開日:
キーワードタグ:
Ultrasonic wave visualization system Decommissioning Finite element analysis Non-destructive testing (NDT) Pipe wall degradation Point Focusing EMAT Ultrasonic testing (UT)
手塚 晃世,(東北大),山本 敏弘,(発電技検),孫 宏君,浦山 良一,内一 哲哉,高木 敏行,(東北大)
発刊日:
公開日:
キーワードタグ:
Ultrasonic wave visualization system Decommissioning Finite element analysis Non-destructive testing (NDT) Pipe wall degradation Point Focusing EMAT Ultrasonic testing (UT)
Electromagnetic acoustic transducer (EMAT) is suited to monitoring because of its non-contacting nature. However, a standard EMAT tends to give overestimating results because the estimated thickness is associated with the average of varying thickness over an area under the coil of EMAT. To solve this problem, Point-Focusing EMAT (PF EMAT), which concentrates ultrasonic waves at a certain point, was applied to thickness gauging. This study evaluates the focusing property of PF EMAT and its applicability to l...
英字タイトル:
Evaluation of Point Focusing EMAT using ultrasonic wave visualization system and finite element analysis
英字タイトル:
Evaluation of Point Focusing EMAT using ultrasonic wave visualization system and finite element analysis
第16回
超音波探傷シミュレーション技術を活用した訓練用データの試作
著者:
古川 敬,上山 芳教,山本 敏弘,直本 保,(発電技検)
発刊日:
公開日:
キーワードタグ:
FEM Flaw Detection Simulator Training Ultrasonic Testing Welds
古川 敬,上山 芳教,山本 敏弘,直本 保,(発電技検)
発刊日:
公開日:
キーワードタグ:
FEM Flaw Detection Simulator Training Ultrasonic Testing Welds
Ultrasonic testing (UT) is one of the most appropriate non-destructive testing because of capabilities for flaw detection and flaw height sizing of flaw. Interpretation and analysis of UT data are not easy, to identify and classify relevant indications are sometimes very difficult. UT personnel shall be qualified to an appropriate level in accordance with a code and standard. In addition, personnel should keep and improve their skills. In this paper, an FEM UT simulation was applied to make UT training data...
英字タイトル:
Prototype of UT Training Simulator using Large Scale FEM Simulation
英字タイトル:
Prototype of UT Training Simulator using Large Scale FEM Simulation