2軸超高速コンテナ船のプロペラ翼応力とベアリングフォースに関する研究(第一報 : 静的応力について)

概要

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With larger and higher-powered ships, "Wide Bladed Propeller" has recently come into use along with multiple shafts as a countermeasure to cavitation erosion due to increased propeller loads. As a result, shaft alignments including propeller shaft bearings in bossings also have become a important design subject for marine engineers. In order to evaluate the propeller bearing forces, a computer program has been developed at the Ship Research Institute of Japan using non-steady lifitng-surface propeller theory. Although the results computed by the program showed good agreement with measured model propeller forces, they have not been verified for operating full-scale propellers. It is hardly possible to measure the propeller bearing forces directly. By virtue of the above mentioned program, however, the bearing forces can be checked by measuring the bending stresses on a fullscale propeller blade according to the process shown in Fig. 1. In this report the statical stress analysis for the propeller blade of a twin screw container ship of 80, 000 SHP, supposed to be operating in a circumferentially mean wake, is presented along with stress measurements obtained on a 1/4 scale propeller. In the second report, these data are to be compared with the actual fluctuating blade stresses mea sured on full scale.