There are few actual ship measurement data showing the propriety of the design loads given by classification societies rules or other relevant rules Therefore, we measured acceleration of ship motion and fluctuating loads on tank supports and chocks of a 75,000 m3 LPG carrier during her voyage. This paper Introduces the subject ship and typical measurement results over about 1∼3 years. From the analysis of these data, the authors have made clear the amount of frequency of fluctuating loads during actual navigation and ascertained the propriety of the ship's design base.
Kawasaki Heavy Industries, Ltd has delivered a total of eight 75,000 m3. Independent prismatic tank type LPG carriers since July 1990. In designing them, the authors carried out extensive structural strength analyses by most advanced FEM and very close fatigue strength analyses, and verified the propriety of such designing and analysis methods through stress measurement, etc. done In the tank test. In these ships" designs, the authors used the dynamic loads provided for in classification societies" rules, etc, but actual ship measurement data showing the propriety of these dynamic loads are few. Therefore, for the purpose of making clear the dynamic loads acting on the hull structure and their frequency and verifying the propriety of the design loads used in designing these ships, the authors measured ship motion accelerations, stresses of the tank support structure, etc on board "Tsugaru Gloria" over about 1∼3 years.
(1) Principal Particulars and General Arrangement The ship's principal particulars and general arrangement are shown In Fig 1 (2) Tank Structure and Tank Support Structure The cargo tank structure and the tank support structure are shown In Fig 2.
(Fig 1,2 are shown in the paper)