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Collaborating Authors
Results
Dynamic Load Measurement On an LPG Carrier During Voyage
Kamoi, Norriyuki (Kawasaki Heavy Industries, Ltd.) | Taniguchi, Tomokazu (Kawasaki Heavy Industries, Ltd.) | Kiso, Takashi (Kawasaki Heavy Industries, Ltd.) | Kada, Kazuo (Kawasaki Heavy Industries, Ltd.) | Motoi, Tatsuya (Kawasaki Heavy Industries, Ltd.) | Nakamura, Shinichi (Kawasaki Heavy Industries, Ltd.)
ABSTRACT 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 m 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. 1. INTRODUCTION 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. 2. OUTLINE OF THE SHIP (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)
Structural Strength Evaluation of a 280,000 DWT Double-Hull VLCC
Taniguchi, Tomokazu (Kawasaki Heavy Industries, Ltd.) | Unno, Makoto (Kawasaki Heavy Industries, Ltd.) | Kada, Kazuo (Kawasaki Heavy Industries, Ltd.) | Kohsaka, Akira (Kawasaki Heavy Industries, Ltd.) | Murakami, Akio (Kawasaki Heavy Industries, Ltd.)
ABSTRACT The connections between the longitudinal and the transverse webs In ship structure have been weak points. In the fatigue strength and neck points In the construction. The authors have developed a new slot structure KAWASAKI APPLE SLOT, that can ensure the structural safety and the constructional easiness. The new slot structure has no connections between the longitudinal and the stiffeners on the transverse web which are hard spots in the conventional slot structure, having specialshaped slots (apple shape) suitable for stress relaxation to compensate the elimination of the stiffeners on the transverse web. This paper discusses a wide range of strength analyses and various experiments using structural models that we conducted before applying this new slot structure to a 280,000 DWT double-hull VLCC. INTRODUCTION In ship structure, the area where a transverse web and a longitudinal cross each other (hereinafter called "the slot") is one of the basic structural elements The structure, load transmission mechanism, and stress condition of the slot are complex In response to oil spills by single-hull VLCCs, oil tankers must now be constructed With double-hull construction. This new requirement causes not only hull weight increase, but also increase of structural members over that in a single-hull tanker. So, new design requirement causes increasing of man-hour and construction periods. Under such circumstances, the authors have been seeking a reliable and simplified slot structure with a reduced number of structural members that could be built using automated and labor- saving construction methods. We then developed a new slot structure called the "Kawasaki Apple Slot". This paper discusses a wide range of strength analyses and various experiments using structural models that we conducted before applying this new slot structure to a 280,000 DWT double-hull VLCC.
- Transportation > Marine (1.00)
- Transportation > Freight & Logistics Services > Shipping > Tanker (1.00)
- Energy > Oil & Gas (1.00)