Stern Vibrations on the "Timoshenko Beam" and on a Kind of Variable Section Beam

Abstract

In the treatise previously presented by the Writer entitled "On the Classification of the Vibration at the Stern of Single Screw Vessels by its Cause of Occurrence, and the Principle of its Prevension," at the Spring Meeting of the Society of Naval Architects of Japan, 1958, the Writer stated his view on the uniform section beam which is comparatively easy to deal with. Further to the above, the Writer hereby collectively reports of the results of his two experiments, viz., one by applying the theory of stern vibration, with a view to bringing this theory closer to the actual conditions of vessels, to the so-called "Timoshenko Beam" wherein the effects of shear rigidity and rotary inertia are taken into consideration, and the other by applying the theory to a kind of variable section beam to observe the effect of the unevenness of rigidity distribution in vessel's hull.