99件が見つかりました。

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第3回
電気ポテンシャル法を用いた地中埋設管の欠陥形状推定
著者:
小島 史男,Fumio KOJIMA
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キーワードタグ:
computational method for recovering adjacent defect shape is considered using a model based approach elated to an elec trical potential method. An inspection model for the electrical potential method is ormulated by a Poisson's equation in three dimensions. The defect shape is then described by the intensities f source functions. The output least square method is applied to our inverse algorithm. The effectiveness of ur approach is shown in the laboratory experiments....
英字タイトル:
hape Identification of Coating Defect in Underground-Pipeline using Electrical Potential Method
第3回
電磁力による鉄筋コンクリートの診断
著者:
橋本 光男,Mitsuo HASHIMOTO,高鍋 雅則,Masanori TAKANABE
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We developed a novel non-destructive inspection method of the pulsed electromagnetic force acoustic method (PEFAM) for diagnosis of condition of reinforcing bars in reinf orced concrete. It is characteristicf this method to use a pulsed electromagnetic force caused by discharge using condenser bank. The orce can generate acoustic waves to a reinforcing rod in the reinforced concrete. Acoustic sensors attachedn the surface of the reinforced concrete detect the acoustic waves. The detected waves include much...
英字タイトル:
Diagnosis of Reinforced Concrete by Electromagnetic Force
第3回
電磁現象を用いた応力腐食割れと疲労割れの非破壊的識別
著者:
遊佐 訓孝,宮 健三
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公開日:
キーワードタグ:
This study develops a computational algorithm to distinguish stress corrosion cracking and fatigue cracks from signals measured electromagne tic-nondestructively. The algorithm utilizes k-nearest neighbour method, and distinguishes the two types of crack on the basis of five-dimens ional features vector extracted from the signals. Experimental verification are performed using 82 specimens including 45 artificial stress corrosion cracking and 37 artificial fatigue cracks. The results demonstarts that the a...
英字タイトル:
Electromagnetic Nondestructive Approach to Distinguish Stress Corrosion Cracking and Fatigue Cracks
第3回
電磁超音波・渦電流複合センサの開発とその有効性の検証
著者:
鈴木 研一郎,Kenichiro SUZUKI,内一 哲哉,Tetsuya UCHIMOTO,高木 敏行,Toshiyuki TAKAGI,佐藤 武志,Takeshi SATO,Philippe Guy,Amelie Casse
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In this study, we propose a novel EMAT-ECT multi sensor aiming at advanced structural health monitoring. For the purpose, proto-type EMAT-ECT multi-sensor was developed and their functions both as ECT and EMAT prove were evaluated. Experimental results of pulse ECT using the EMAT-ECT multi-sensor showed that the pr oposed sensor has a capability of detection and sizing of flaws. Experimental results of EMAT evaluation using the EMAT-ECT multi-sensor showed that ultrasoni c wave was transmitted by EMAT-ECT ...
英字タイトル:
Development of novel EMAT-ECT multi-sensor and verification of its feasibility
第3回
非破壊検査を考慮した原子炉容器の確率論的構造健全性評価手法の開発
著者:
小坂部 和也,Kazuya OSAKABE,鬼沢 邦雄一,Kunio ONIZAWA,柴田 勝之,Katsuyuki SHIBATA
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As a part of the aging structural integrity research for LWR components, the probabilistic fracture mechanics (PFM) analysis code PASCAL has been developed in JAEA. This code evaluates the conditional probabilities of crack initiation and fracture of a reactor pressure vessel (RPV) under transient conditions such as pressurized thermal shock (PTS). A case study on the effect of non-destructive examination performance was performed using PASCAL. The analysis results showed that one non-destr uctive examinat...
英字タイトル:
Development of Probabilistic Fracture Mechanics Analysis Code PASCAL For Reactor Pressure Vessel Considering Non-Destructive Examination
第3回
非線形超音波による微細損傷の画像化
著者:
川嶋 紘一郎,Koichiro KAWASHIMA,村瀬 守正,Morimasa MURASE,伊藤 智啓,Toshihiro ITO
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Nonlinear ultrasonic imaging technique is applied for detection and sizing of tight cracks. Tight crack su rfaces are clapped and rubbed repeatedly by high-powered burst waves, thus higher and sub-harmonics are ge nerated. By using a band-pass or high-pass filter, the second and higher harmonic components are extracted from the received signals and the amplitude map is constructed. We can make the ultrasonic images of the cracked surface itself, by focusing the ultrasonic beams on peaks of rugged cracked s...
英字タイトル:
Imaging of Small Defects and Tight Cracks with Nonlinear Ultrasonics
第3回
高信頼性を経済的に実現する保全計画法
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It seems to take a long time before to reach completion of lifetime estimation methods of equipment. To overcome these difficulties from the lack of lifetime estimation knowledge , many efforts, such as on stream inspections, etc. are made to fill the gap. Under such situation, this study proposes a most effective solution, which utilizes all operation r esults and efforts available, putting into an organically arranged system to realize better performance and reliability to the plant at minimum cost. And ...
英字タイトル:
Planning Method of Maintenance Scheduleto Ensure High Reliability at Minimum Cost
第3回
高温長時間延性・靭性の向上を目的とした VING 添加高クロム鋼に及ぼす熱処理の影響
著者:
小原 智史,Satoshi OBARA,鬼澤 高志,Takashi ONIZAWA
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This paper describes the heat treatment technique to improve the long-term property of high Cr steel in terms of MX precipitation hardening mech anism. The microstructure examinations using optical and electron microscopes and Vicker's hardness tests are conducted. As a result, it is clari fied that fine MX particles are obtained by solution treatment at hot rolling temperature and that the number of particles increases with the no rmalizing temperature. It suggests that MX particles stable at elevated tem...
英字タイトル:
Effect of heat treatment on V/Nb added high Cr steel aiming of the improvement of high temperature long term ductility and toughness
第3回
高経年化対策基盤強化のための研究開発と保全高度化
著者:
関村 直人,Naoto SEKIMURA
発刊日:
公開日:
キーワードタグ:
The major research and development fields for ageing management of complex systems such as nuclear power plants are categorized into the following 4 items; 1) research and development of technologies for inspection, eval uation and repair in the components and materials, 2) engineering information systems, 3) development of codes and standards and 4) synthesized maintenance engineering. The “synthesized maintenance engineering” field in cludes methodologies for optimum combination for inspection, maintenan...
英字タイトル:
Research and Development Strategy and Maintenance Engineering to Strengthen the Basis of Ageing Management
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