Study on the Vibration of Bulk Carrier

Research Project

Project/Area Number	62460145
Research Category	Grant-in-Aid for General Scientific Research (B)
Allocation Type	Single-year Grants
Research Field	船舶構造・建造
Research Institution	HIROSHIMA UNIVERSITY
Principal Investigator	YAO Tetsuya (1988) Hiroshima University ・ Professor, 工学部, 教授 (20029284) 広渡智雪 (1987) 広島大学, 工学部, 教授 (10144875)
Co-Investigator(Kenkyū-buntansha)	TANAKA Kazumasa Oshima National Callege of Marritime Technology ・ Professor, 情報工学科, 教授 (10034422) MICHIMOTO Jun-ichi Hiroshima University ・ Associate Professor, 工学部, 助教授 (80106806) 矢尾哲也広島大学, 工学部, 助教授 (20029284)
Project Period (FY)	1987 – 1988
Project Status	Completed (Fiscal Year 1988)
Budget Amount *help	¥4,900,000 (Direct Cost: ¥4,900,000) Fiscal Year 1988: ¥2,000,000 (Direct Cost: ¥2,000,000) Fiscal Year 1987: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywords	Coupled vibration / Bulk carrier / トップサイドタンク
Research Abstract	There are several report in which the Violent vibration was measured at the top side tank of bulk carrier. In order to investigate these vibration, the ship was divided into the main bull, bottom and top side tank, and the coupled vibration among these structures was calculated. In this method, the main hull, bottom and top side tank were expressed as the Timoshenko-beam, orthotropic plate and bending-torsional beam respectively. The accuracy of this calculation method was confirmed by the comparison between the calculated and the experimental results. But the violent vibration which was seen on actual ship was not calculated. For this reason, it was considered that the modeling of top side tank is not proper. Then, a method to calculate the vibration of the thin walled elastic beam like the top side tank was proposed, in which the deformation of cross section was considered. The vibration of actual ship was calculated considering deformation effect of cross section of top side tank, and the natural vibration at which the vibration of top side tank becom dominant was obtained.