推进轴系合理校中轴承负荷比优化及轴线设计

Optimum design of load ratio between bearings in rational alignment of propulsion shaft

针对推进轴系直线校中方法的缺陷和目前轴承负荷法校中方法的局限性,提出了满足艉管前后轴承的负荷比最佳的轴系合理校中设计方法.对旋转时的轴线进行优化设计,并对一个简化轴系模型进行校中计算,计算结果显示:艉管前后轴承的负荷比在1/2～1/3的范围内时,全轴系的轴线是曲线且轴承不是都在一条直线上,后轴承对设计轴线的偏离量较大;艉管后轴承支撑点处截面转角超过了3.5×10-4 rad.

To improve the straight alignment and the rational alignment method,a rational alignment method of the propulsive shafting was proposed,which can ensure the ratio of the load of the forward stern-tube bearing to the load of the afterward stern-tube bearing to be the optimal.The shaft-line of a running propulsive shaft was optimized and the shaft alignment calculation was carried out for the model of a simplified propulsive shaft.The result illustrate that if load-ratio is in the scope of 1/2～1/3,the shaft-line is curvilinear and all bearings of propulsion shaft are not in a straight-line,and the vertical bearing slope of the afterward stern-tube bearing（to reference of straight-line）is more than 3.5×10-4 rad.