138件が見つかりました。

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第10回
耐熱磁気センサの開発
著者:
髙屋 茂,Shigeru TAKAYA,荒川 尚,Hisashi ARAKAWA,欅田 理,Satoshi KEYAKIDA
発刊日:
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キーワードタグ:
A heat-resistant flux gate magnetic sensor has been developed. Permendur, which has high Curie point, is employed as the magnetic core material and the detection method of the external magnetic field is modified. The characteristics of the developed magnetic sensor up to 500 oC were evaluated. The sensor output increased linearly with the external magnetic field in the range of ±5 G and the standard deviation at 500 oC was about 0.85G. ...
英字タイトル:
Development of Heat-resistant Magnetic Sensor
第10回
蒸気タービン鋳鋼製車室・弁き裂進展解析手法の開発
著者:
西田 秀高,Hidetaka NISHIDA
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キーワードタグ:
For high accuracy residual life assessments, Development of ｃｒａｃｋgrowth analysis method for the casing and Valve in the steam turbin has a lot of needs cuttting down of the repair costs and safty operating of the power station . We developed method that measuring by laser instrument , using creepcrack analysis by FEM and , and testing for a long time of crackgrowth by testpieces are mixed in the new technology. Our created method is very accuracy for result compared with ｃｒａｃｋgrowth of the service pla...
英字タイトル:
Development of the crack growth analysis method for the Casing and Valves in The Steam turbin maked by cast steel
第10回
複雑形状部での物質伝達係数と形状係数
著者:
猪飼 太郎,Taro IKARI,片井 勇旭,Yuki KATAI,恒吉 達矢,Tatsuya TSUNEYOSHI,伊藤 高啓,Takahiro ITO,辻 義之,Yoshiyuki TSUJI
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Flow Accelerated Corrosion (FAC) is one of the issues to be noticed considerably in plant piping management. For the integrity and safety of t he plant, the wall-thinning and thinning rate due to FAC should be clely predicted in pipe wall inspection. In this paper, we study FAC fro m the view point of flow dynamics. The mass transfer coefficient is estimated by the numerical simulation inside the bent. Changing the Reynol ds number, the peak location of mass transfer coefficient and its maxim value is eval...
英字タイトル:
Mass Transfer and Shape Factor in Complicated Flow Field
第10回
設計疲労線図の開発状況
著者:
朝田 誠治,Seiji ASADA,樋口 洵,Makoto HIGUCHI,金崎 宏,Hiroshi KANASAKI,瀬良 健彦,Takehiko SERA
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In order to develop and propose new design fatigue curves for austenitic stainless steels, carbon steels and low alloy steels that are rational and ha ve clear design basis, Design Fatigue Curve (DFC) subcommittee was established in the Atomic Energy Research Committee in the Japan Welding Engineerin g Society and the study on design fatigue curves are going on. The fatigue curves are proposed as a function of their tensile strength based on large number of fatigue data tested in air from room temperature...
英字タイトル:
Status of Development for Design Fatigue Curves
第10回
試験片表面観察に基づく微小疲労き裂成長予測モデルの検討
著者:
阿部 茂樹,Shigeki ABE,西 朋秀,Tomohide NISHI,中村 隆夫,Takao NAKAMURA,釜谷 昌幸,Masayuki KAMIYA
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After Fukushima Daiichi accident, nuclear power plants are required to ensure the system safety with long te rm operation. Present design code requires the assessment of CUF (cumulated usage factor) to prevent the occ rence of fatigue damage. However, it is difficult to introduce the concept of CUF into the system safety eva luation which needs probabilistic risk assessment. For the probabilistic evaluation of fatigue failure, thi s study intends to show the prediction of micro crack growth by simulation. ...
英字タイトル:
Approach to establish micro crack growth prediction model based on surface observations of fatigue test specimen
第10回
超音波反射強度変化の自己相関性による 玉軸受の転がり挙動評価
著者:
若林 利明,Toshiaki WAKABAYASHI,向井 昌規,Masanori MUKAI
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Failures of machines having rotating parts are mostly caused by damage to bearings and conventional diagnostic methods have found difficulties in performing the early detection of such damage, so that more advanced diagnosis is necessary. This study therefore applies an ultrasonic technique to bearing life tests. The experimental results of ultrasonic wave pulse (UWP) echoes have demonstrated that the time intervals between peaks of UWP echoes varied in accordance with the movement of rolling balls. Th...
英字タイトル:
Evaluation of Rolling Behavior in Ball Bearings by Autocorrelation of Changes in Ultrasonic Reflection Intensity
第10回
軸受の潤滑状態を監視・評価するためのパラメータについて
著者:
川畑 雅彦,Masahiko KAWABATA,吉田 直樹,Naoki YOSHIDA
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Abstract: At the maintenance scene, experience shows that a change of wear debris amount in oil occurs in connection with a change of machinery’s lubricating condition. This study reports a result of destruction test using an actual sliding bearing of lifting pump which is made up an extreme lubricating condition. The bearing is monitored a wear debris occasion in real-time for confirming a correlation between the change of lubricating condition and the change of wear debris amount in oil. As a result,...
英字タイトル:
A parameter for monitoring and evaluating the lubrication state of bearing
第10回
逐次ファジィ・ニューラルネットワークによるポンプの精密異常診断
著者:
神 豊,Yutaka JIN,薛 紅涛,Hongtao XUE,李 可,Ke LI,陳山 鵬,Ho JINYAMA,山村 尚広,Naohiro YAMAMURA,水津 明日香,Asuka SUIZU
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Abstract : This paper presents a precise condition diagnosis method for a centrifugal pump using sequential fuzzy neural network (SFNN). Firstly, the feature signals of fault states are extracted from the measured vibration signals for the pump condition diagnosis in different frequency regions by statistic filter, symptom parameters (SPs) for distinguishing fault types are defined and calculated by using the feature signals. Secondly, to distinguish the pump state, sequential fuzzy neural network (SFN...
英字タイトル:
Precise Diagnosis Method for Centrifugal Pump by Sequential Fuzzy Neural Network
第10回
過熱水蒸気中におけるNi基合金での割れ感受性、粒界酸化、皮膜酸化物に及ぼす酸化力の影響
著者:
熊谷 大介,Daisuke KUMAGAI,阿部 博志,Hiroshi ABE,渡邉 豊,Yutaka WATANABE
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In this study, we investigate the effect of oxygen potential on oxide film, intergranular oxidation and cracking susceptibility on nickel base alloy in hydrogenated superheated steam at 400℃. Intergranular cracking occurred at oxygen potential of LOGPO2=-26.32(Ni/NiO equilibrium). In contrast, no cracking occurred at oxygen potential of LOGPO2=-24.09 and LOGPO2=-27.04(near the cracked condition). This result shows that oxygen potential range for cracking susceptibility seemed to be narrow in hydrogenat...
英字タイトル:
Effect of oxygen potential on oxide film, intergranular oxidation and cracking susceptibility on nickel base alloy in superheated steam
第10回
過酷事故向け熱電対式原子炉水位計測システム及び 水素濃度検出システムの開発
著者:
黒田 英彦,Hidehiko KURODA,岡崎 幸基,Koki OKAZAKI,白石 藤雄,Fujio SHIRAISHI,見城 弘章,Hiroaki KENJYO,磯田 浩一郎,Koichiro ISODA
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TEPCO’s Fukushima Daiichi Nuclear Power Station Accident caused severe accident to lose functions of many instrumentation systems. As a result, many important plant parameters couldn’t be monitored. In order to monitor plant parameters in the case of severe accident, new instrumentation systems available in the severe conditions are being developed. Water level in reactor pressure vessel and hydrogen concentration in primary containment vessel are one of the most important parameters. Performance test ...
英字タイトル:
Water Level Measurement System in Reactor Pressure Vessel of BWR and Hydrogen Concentration Monitoring System for Severe Accident
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