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Offshore Technology Conference | 1983

Drag forces on oscillating cylinders in a uniform flow

Minoru Kato; Toru Abe; Masaru Tamiya; Tadashi Kumakiri

This paper describes the drag coefficients of cylinders oscillated in both in-line and transverse directions to a uniform flow. The drag coefficients C/SUB D/ have been obtained experimentally over a wide range of oscillating frequencies, amplitude and flow velocities for the cylinders of various diameters under simulated practical offshore conditions. The boundary between the regions, where C/SUB D/ approx. =1 and C/SUB D/ <1, are clearly established by employing the Keulegan-Carpenter number and the Reduced Velocity as dimensionless numbers. These numbers also describe C/SUB D/ variation within the region of rapid C/SUB D/ value decrease. Recommendations are offered for determining C/SUB D/ values in order to predict the dynamic response of risers under actual offshore conditions.


Archive | 1984

Telescopic riser joint

Eiichiro Ideno; Masaru Tamiya; Katsumi Ogawa; Tadashi Kumakiri


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2012

Effects of plasma carburizing and DLC coating on friction-wear characteristics, mechanical properties and fatigue strength of stainless steel

Tatsuro Morita; Yasunori Hirano; Keita Asakura; Tadashi Kumakiri; Masaru Ikenaga; Chuji Kagaya


Transactions of the Japan Society of Mechanical Engineers. A | 2006

Fatigue Properties of DLC Coated Stainless Steel

Tatsuro Morita; Kouta Tomita; Chuji Kagaya; Tadashi Kumakiri; Masaru Ikenaga


Journal of Solid Mechanics and Materials Engineering | 2008

Fatigue Properties of DLC-Coated Stainless Steel

Tatsuro Morita; Kouta Tomita; Chuji Kagaya; Tadashi Kumakiri; Masaru Ikenaga


Materials Transactions | 2013

Effect of Hybrid Surface Treatment Composed of Plasma Nitriding and DLC Coating on Friction Coefficient and Fatigue Strength of Stainless Steel

Tatsuro Morita; Kouichi Andatsu; Satoshi Hirota; Tadashi Kumakiri; Masaru Ikenaga; Chuji Kagaya


Archive | 2003

Film deposition system and film deposition method using the same

Hirofumi Fujii; Tadashi Kumakiri; Katuhiko Shimojima


Transactions of the Japan Society of Mechanical Engineers. A | 2009

Fatigue Properties of Stainless Steel Coated by DLC Multi-Layer

Tatsuro Morita; Yasunori Hirano; Kouta Tomita; Tadashi Kumakiri; Chuji Kagaya; Masaru Ikenaga


Archive | 2003

Schichtabscheidungssystem und Schichtabscheidungsverfahren unter Verwendung desselben

Hirofumi Fujii; Tadashi Kumakiri; Katuhiko Shimojima


Archive | 2003

Système de dépôt de couche et procédé de dépôt de couche utilisant le système

Hirofumi Fujii; Tadashi Kumakiri; Katuhiko Shimojima

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Tatsuro Morita

Kyoto Institute of Technology

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Kouta Tomita

Kyoto Institute of Technology

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Yasunori Hirano

Kyoto Institute of Technology

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Keita Asakura

Kyoto Institute of Technology

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Kouichi Andatsu

Kyoto Institute of Technology

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