アライメント計算におけるクランク軸の曲げ剛性及び等価軸径について

抄録

At present, shafting alignment calculation is commonly performed as a continuous beam subject to weight of the propeller and the shaft itself. In many cases, main engines have been regarded as rigid, and bending behavior of the crankshafts was not carefully examined. In most cases of shafting alignment calculation, therefore, crankshafts were simply replaced with a round bar having a diameter equal to that of the journal. However investigation into recent damage of several main bearings showed the need for more accurate crankshaft alignment calculations. For this purpose, the crankshaft should be replaced with a round bar having equivalent bending stiffness. This report presents the numerical analysis results regarding determination of the diameter of an equivalent round bar..