STRESS AND MOTION MEASUREMENTS ON THE CONTAINER SHIP JAPAN ACE IN SERVICE

Although many large and fast container ships have been built, there still remain several problems not yet confirmed concerning the hull strength in service. During one round trip across the Pacific Ocean in the past winter, we measured the various stresses and motions of the container ship "JAPAN ACE", built at an IHI shipyard. Measured items are longitudinal stresses on upper deck, vertical accelerations, rolling angles, pitching angles, impact water pressure at the bow, whipping stresses, stresses around the hatch corner and the distortion of the hatch opening. In regard to the longitudinal stresses on the upper deck, we confirmed that these stresses conformed to the Rayleigh distribution for the short term distribution, and estimated the long term distribution using several methods. Furthermore longitudinal stresses on the upper deck were divided into the three components; the longitudinal wave bending stress, horizontal bending stress and torsional stress, and each component was analyzed statistically. With the results of the comparison made between the measured values on the ship's motion and those theoretically calculated for the short term distribution, the long term distributions were estimated. Based on measured waveforms and statistically analyzed values, some considerations were given for other measuring data concerning wave impact and its whipping phenomena, hatch opening distortion, stress around the hatch corner.

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  • Corporate Authors:

    Ishikawajima-Harima Heavy Industries Co., Ltd.

    2-16, Toyosu 3 Chome, Koto-Ku
    Tokyo 135,   Japan 
  • Authors:
    • Kumakura, Y
    • NAGANO, T
    • Okumoto, Y
    • Tanida, K
  • Publication Date: 1975-5

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Filing Info

  • Accession Number: 00098175
  • Record Type: Publication
  • Source Agency: Ishikawajima-Harima Heavy Industries Co., Ltd.
  • Files: TRIS
  • Created Date: Sep 30 1975 12:00AM