On the Effects of Shear Deflection and Rotatory Inertia upon the Damping of Ship Vibrations in the Higher Modes

Kumai, Toyoji

doi:10.2534/jjasnaoe1952.1964.139

Cited by 3 publications

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“…Any considerations are, however, left out here either on the reduction of rigidity or the effect of coupled vibration of the bottom panel of the hull and deck house on ship hull vibration, both in the higher frequency of the vibration. For that further study about (4) and (5) Substituting (a), (b) and (c) into (2), following current formula is obtained,…”

Section: Introductionmentioning

confidence: 99%

On the Estimation of Natural Frequencies of Vertical Vibration of Ships

Kumai

1967

Journal of Zosen Kiokai

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SummaryThe paper deals with the estimation of natural frequencies of the vertical vibration of ship hull, taking into account the recent investigations on the effects of fineness of the hull, shear deflection and rotatory inertia and the virtual inertia coefficient of the water. Some empirical factors obtained from the observations on board actual ships are shown.Here are also put forward new empirical formulae for estimating inertia coefficient of the water surrounding a vibrating ship based on the data obtained from several ship-shaped models.

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Section: Introductionmentioning

confidence: 99%

On the Estimation of Natural Frequencies of Vertical Vibration of Ships

Kumai

1967

Journal of Zosen Kiokai

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Transient stefan flow and thermophoresis around an evaporating droplet

Vittori¹

1984

Il Nuovo Cimento C

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Higher Mode Vertical Vibration of Giant Tanker (2nd Report)

Ohtaka

Kagawa

Yamamoto

1970

J. SNAJ, Nihon zousen gakkai ronbunshu

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In the higher mode vibration of giant tankers the transverse section of the ship deforms elastically, and the side shell and the longitudinal bulkhead show the individual deflection, as explained in the first reports). In this report, the hydrodynamic inertia has been investigated theoretically for such a case, and the results shows that the hydrodynamic inertia has three components, i.e., added mass of water for longitudinal bulkhead member, that for side shell member and the hydrodynamic coupling term. Theoretical estimation of these three components nearly coincides with the experiment. The calculation of the natural frequency of the ship using the hydrodynamic inertia derived above agrees with the experiment in a full scale ship with 5% of errors. The calculation of response to a sinusoidal force has been also carried out, the results of which show that, although the calculation agrees with experiment qualitatively, more study is necessary to acquire the precise result.

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On the Effects of Shear Deflection and Rotatory Inertia upon the Damping of Ship Vibrations in the Higher Modes

Cited by 3 publications

References 0 publications

On the Estimation of Natural Frequencies of Vertical Vibration of Ships

On the Estimation of Natural Frequencies of Vertical Vibration of Ships

Transient stefan flow and thermophoresis around an evaporating droplet

Higher Mode Vertical Vibration of Giant Tanker (2nd Report)

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