船体固有振動数の計算法

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Nowadays we can estimate the natural frequencies of ships' vertical vibration pretty accurately, using the electronic computer. It is so troublesome, however, to prepare the input data for this calculation that the conventional method of using the computer cannot easily be applied to the designing of the ship's hull. In this report, therefore, we calculated the rigidities and the added virtual mass of many actual ships and decided their distributiones for each kind of ships; oil tanker, ore carrier and bulk carrier. We completed the programme in which these predetermined distributions are incorporated, requiring far less input data than before. This programme can be used at the designing stage. Comparing the frequencies calculated by this programme with the frequencies measured on many actual ships, we were convinced of the accuracy of this programme. Furthermore it is found in a calculation using the above mentioned programme that mode curvers of vertical vibration of any nodes do not vary much with any different loading conditions and kinds of ships. Making use of this fact and supposing the ship is a variable beam in which the effect of the shearing delection as well as bending deflection are considered, we complete the simplified formula by which we can calculate easily the natural frequencies of the 2-5 node vertical vibration for each kind of ships; oil tanker, ore carrier, and bulk carrier. Comparing the frequencies obtained by this formula with the frequencies measured on many actual ships, it is found that this simplified formula gives pretty good accuracy as compared with the simplified formulae published up to date. In the same way as described before we also completed another simplified formula for ship's horizontal vibration and longitudinal vibration.
社団法人日本船舶海洋工学会の論文
1968-02-29

船体固有振動数の計算法

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