航洋中の自動車運搬船における実船計測及びプロペラ翼の強度

抄録

The authors had a chance to measure simultaneously the ship oscillation, the hull vibration, various stresses of the propeller shaft and the fluctuations of the hydraulic pressure induced by the propeller. From the results of the statistical and the time-series analysis of these data, it is clear that there is a relation between the fluctuations of these data and the ship motion, the pitching motion in particular. As the example of the data application, the strength of the propeller blade in service condition is discussed. The stress of the propeller blade can be calculated theoretically by the lifting surface theory and the finite element method. Using this calculating program and the data, the simulating method to estimate the blade stress in service condition is proposed. Furthermore, using the fatigue and the crack propagation data of the propeller material, the correlation chart between the crack length and the life time of the propeller to failure is made.