Vertical Vibration of Ships Coupled with Bottom Vibration (1st Report)

概要

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Coupled vibration of ship hull with bottom has been treated theoretically and the equation of motion has been derived where the main hull is simulated as Timoshenko Beam and the bottom as orthotropic plate. The numerical solution of the equation has been coded in the digital computer. The results of test calculation agree with those derived by Prof.Yamakoshi and Mr.Ohnuma^<1)>. Qualitative investigation, including the examination of the effect of the transverse bulkheads, has been made on a box beam model whose particular such as rigidities and weights of hull and bottom are nearly equal to those of the midship part or 20,000 tons D.W. bulk barrier. It is found that the vibration characteristics become very complex in the higher modes due to the effect of coupled vibration and the deviation from the beam theory is quite prominent. The transverse bulkheads make significant influence on the frequency and mode of the vibration.
社団法人日本船舶海洋工学会の論文