初期設計時に於ける船体固有振動許容起振力の推定

概要

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The idea that we calculate the natural frequency of hull vibration and design the ship so as to be able to keep it out from the range of revolution of propeller shaft corresponding to this natural frequency, should be replaced by the positive idea to keep in so small amplitude that can not be the cause of troubles even in the resonance vibration. Because the estimation of the natural frequency of hull has so frequent and so big error that makes the former idea impossible and moreover the operator always insists the latter idea under the necessity of the voyage in every loading and weather condition.The latter idea requires to decide the allowable intensity of vibration and its allowable exciting force.This paper shows the method used at the time of preliminary design of the ship to investigate and estimate the kind of natural vibration and its maximum possible intensity at each condition of the ship which may cause troubles, and furthermore to decide the allowable unbalanced force and moment of the main engine for the natural vibration of hull, using the idea of safty factor from the actual data of hull vibrations.
社団法人日本船舶海洋工学会の論文