A Study of Vertical Vibration of Ships (2nd report)

Natural frequencies of the vertical vibration of bulk carriers and destroyers were calculated by means of a digital computer, with a special attention to the shear rigidity, and the results were compared with those of the measurements on their sea trials. Both results showed good agreements in the lower mode, while in the higher mode there are discrepancies which are attributed to the estimation of the physical properties of ships. The ratio of calculated frequencies are nearly equal in the same type of ship and the empirical coefficients can be made for the similar ships. Contents

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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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A Study of Vertical Vibration of Ships (2nd report)

Cited by 6 publications

References 1 publication

A Study on Higher Mode Vibration of Ships (1st report)

A Study on Higher Mode Vibration of Ships (1st report)

A Study of Vertical Vibration of Ships (1st report)

On the Estimation of Natural Frequencies of Vertical Vibration of Ships

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