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

概要

論文の詳細を見る
The relation between the logarithmic decrement of the damping and the natural frequencies of a free-free beam which is in higher modes of flexural vibration is theoretically investigated here, taking into account as parameters the shear deflection and rotatory inertia factors as well as the inner damping force due to the normal and tangential viscosities of the material or structure of the beam. The external damping force is ignored. It is concluded that the shear deflection and the tangential viscosity of the beam have more conspicuous effect than the rotatory inertia and normal viscosity. In regard to the rotatory inertia, the logarithmic decrement increases with the increase of rotatory inertia, though the natural frequency decreases. The results of the investigation will be applied to the response calculation in the higher mode of the ship hull vibrations excited by the propeller blade force.
社団法人日本船舶海洋工学会の論文