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論文
ファジィ・サポートベクターマシンによる 回転機械の複合異常状態の逐次診断法
著者:
薛 紅涛,Hongtao XUE,陳山 鵬,Peng CHEN,神 豊,Yutaka JIN,宮 健三,Kenzo MIYA
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公開日:
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Abstract: When multi-faults state occurred in a plant rotating machine, because the relationship between fault types and vibration signals measured for the diagnosis are much more complex than the case of single fault, moreover, the condition diagnosis information from vibration signals is ambiguous, especially at early stage, the diagnosis for the multi-faults is more difficult. In order to resolve the problem, this paper proposes a new precise diagnosis method for rotating machinery using support ve...
英字タイトル:
Sequential Diagnosis Method for Multi-faults State of Rotating Machinery Using Fuzzy Support Vector Machine
論文
渦電流探傷試験における熱疲労割れの数値モデリング
著者:
遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME,Iikka VIRKKUNEN,Mika KEMPPAINEN
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公開日:
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Abstract. This study discusses a suitable numerical modeling of a thermal fatigue crack from the viewpoint of eddy current testing. Five artificial thermal fatigue cracks, introduced into type 304L austenitic stainless steel plates with a thickness of 25 mm, are prepared; and eddy current inspections are carried out to gather signals using an absolute type pancake probe and a differential type plus point probe. Finite element simulations are then carried out to evaluate a proper numerical model of the...
英字タイトル:
Numerical modeling of thermal fatigue cracks from the viewpoint of eddy current testing
論文
福島第一原子力発電所 1 号機事故の熱流動現象の推定 ―非常用復水器が作動していた場合―
著者:
円山 重直,Shigenao MARUYAMA
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キーワードタグ:
An accident scenario of Fukushima Daiichi Nuclear Power Plant, Unit 1 is analyzed from the data open to the public. The author assumed that the isolation condensers were partially functional at the initial stage of the accident. The estimation describes that the rupture time of the pressure containment vessel was at 4:00 12/3/2011 and the rupture area was approximately 8 cm in equivalent diameter. The estimation shows that the rupture time of the reactor pressure vessel was at approximately 6:00 12/3...
英字タイトル:
Heat and Fluid Flow in Accident of Fukushima Daiichi Nuclear Power Plant, Unit 1- When the Isolation Condenser Was Working -
論文
福島第一原子力発電所 3 号機事故の熱流動現象の推定 ―高圧注水系(HPCI)が途中で止まった場合―
著者:
円山 重直,Shigenao MARUYAMA
発刊日:
公開日:
キーワードタグ:
An accident scenario of Fukushima Daiichi Nuclear Power Plant, Unit 3 is analyzed from the data open to the public. The author assumed that the high pressure coolant injection system (HPCI) stopped before TEPCO stopped it manually, and the vapor in the reactor pressure vessel (RPV) is condensed in the condensate storage tank. The estimation describes that the rupture time of the reactor pressure vessel was at 8:55 13/3/2011. The estimation shows that the rupture time of the pressure containment vesse...
英字タイトル:
Heat and Fluid Flow in Accident of Fukushima Daiichi Nuclear Power Plant, Unit 3 - When the high pressure coolant injection system (HPCI) stopped -
論文
表面加工による残留応力改善の長期信頼性評価について
著者:
瀬良 健彦,Takehiko SERA,平野 伸朗,Shinro HIRANO,千種 直樹,Naoki CHIGUSA,岡野 成威,Shigetaka OKANO,才田 一幸,Kazuyoshi SAIDA,望月 正人,Masahito MOCHIZUKI,西本 和俊,Kazutoshi NISHIMOTO
発刊日:
公開日:
キーワードタグ:
Abstract Surface finishing methods, such as Water Jet Peening (WJP), have been applied to welds in some major components of nuclear power plants as a counter measure to Primary Water Stress Corrosion Cracking (PWSCC). In addition, the methods of surface finishing (buffing treatment) is being standardized, and thus the buffing treatment has been also recognized as the well-established method of improving stress. On the other hand, the long-term stability of peening techniques has been confirmed by acc...
英字タイトル:
Prediction method of long-term reliability in improving residual stresses by means of surface finishing
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