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論文
ポンプ軸受の欠陥の大きさと電磁診断技術の信号との相関関係
著者:
萱田 良,Ryo KAYATA,三好 剛正,Takemasa MIYOSHI,藤原 英起,Hideki FUJIWARA,ペラン ステファン,Perrin Stephane,角皆 学,Manabu TSUNOKAI,高瀬 健太郎,Kentaro TAKASE,宮 健三,Kenzo MIYA
発刊日:
公開日:
キーワードタグ:
A new electromagnetic method for the nondestructive evaluation of electric pumps with ball bearings is proposed. A permanent magnet generates a static magnetic field and a coil of several hundred turns wrapped around it is used to pick up eddy currents induced inside rotating ball bearings and impellers. First, a method that makes use of the autocorrelation is applied to the signals of the ball bearings. A relation between the processed signals and the size of the defects in the bearings is obtained....
英字タイトル:
Electromagnetic Nondestructive Detection for Wounded Bearings and Correlation of Size of Defect and Signal
論文
流動加速腐食による配管減肉に関する研究 (旋回流とオリフィス偏心の組み合わせ効果による物質輸送現象)
著者:
高野 剛,Tsuyoshi TAKANO,山縣 貴幸,Takayuki YAMAGATA,伊藤 嘉人,Yoshito ITO,藤澤 延行,Nobuyuki FUJISAWA
発刊日:
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キーワードタグ:
In this paper, pipe-wall thinning phenomenon behind an orifice in a circular pipe is studied by measuring the mass transfer coefficient along the pipe wall by naphthalene sublimation method. An attention is placed on the asymmetrical pipe-wall thinning phenomenon behind an orifice under the influence of swirling flow and allowable orifice bias. The present measurement indicates that the mass transfer coefficient becomes asymmetric about the pipe axis behind the orifice in certain combinations of swirl...
英字タイトル:
Investigation on Pipe-wall Thinning by Flow-accelerated Corrosion (Mass Transfer Phenomenon by Combined Effect of Swirling Flow and Orifice Bias)
論文
液滴衝撃エロージョンに関する研究 (高速噴霧流による減肉特性の評価)
著者:
濱 大地,Daichi HAMA,山縣 貴幸,Takayuki YAMAGATA,高野 剛,Tsuyoshi TAKANO,藤澤 延行,Nobuyuki FUJISAWA
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キーワードタグ:
The liquid droplet impinging erosion has been a topic of interests related to the maintenance of highly-aged nuclear power plant. However, there exists very few erosion data for small liquid droplets having an order of tens of micrometer in diameter, which is often encountered in prototype pipelines for nuclear power plant. In the present paper, the liquid droplet impinging erosion is investigated by high-speed spray to study the erosion rate of aluminum material with respect to droplet parameters, su...
英字タイトル:
Investigation on Liquid Droplet Impinging Erosion (Evaluation of erosion rate by high-speed spray)
論文
異材溶接部のイメージベース波動伝搬シミュレーションと その実験的検証
著者:
中畑 和之,Kazuyuki NAKAHATA,廣瀬 壮一,Sohichi HIROSE,Martin BARTH,Bernd KOHLER,Frank SCHUBERT
発刊日:
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キーワードタグ:
The ultrasonic testing (UT) of a dissimilar metal welding part is difficult due to the acoustic anisotropy and local heterogeneity. The ultrasonic wave in the weld is skewed along crystallographic directions and scattered by metal grain boundaries. Here we propose a straightforward UT simulation tool to predict wave propagation in the weld. The tool is based on the finite integration technique (FIT) and the image-based modeling. In our simulation, a picture of a specimen with a V-groove weld is scanne...
英字タイトル:
Image-based Simulation of Wave Propagation in Dissimilar Metal Welding Part and Its Verification
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