長大倉口船の捩り-曲げ連成固有振動の研究(第4報) : 端部に剛体部をもつ薄肉開断面棒の捩り-曲げ連成振動

概要

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In the first, second and third reports the main features of coupled torsional and flexural vibration of a free-free uniform bar with open cross section were investigated theoretically and experimentally It was shown that in order to calculate the natural frequencies correctly the effects of torsional rigidity GJ and shear deflection should be considered, and that when a bar had transverse bulkheads the effect of transverse bulkheads could be treated with the equivalent torsional rigidity GJ. In this report, theoretical and experimental studies are made, based on the above results, on the coupled torsional and flexural vibration of a free-free uniform bar with open cross section having closed section parts at both ends, which can be regarded as a simplified model of a ship with large hatch openings. It is found that the natural frequencies and the modes of vibration of the above-mentioned bar can be calculated by the matrix method with reasonable accuracy in the lower modes of vibration by regarding the closed section parts as rigid bodies, if their length are small in comparison with the length of the open section part.
社団法人日本船舶海洋工学会の論文
1969-06-30