艉管后轴承多支点模拟探讨

Discussion of Multi-point Simulation for Aft Stern Bearing

基于目前大多数主机厂在进行轴系校中计算时,仍根据自身经验对艉管后轴承进行单支点模拟的现状,分别对艉管后轴承进行单支点和多支点模拟计算后发现:对于采用偏心加工的艉管后轴承,多支点计算准确度更高。同时鉴于目前广泛使用的顶举法校中是以轴系校中计算书中的轴系负荷为校中验收依据,指出:如校中计算不准确会给船舶的运营带来巨大风险。据此建议:大型船舶的轴系校中计算,艉管后轴承进行多支点模拟,以消除轴系校中安装过程中的隐患。

As now most main engine makers still adopt single-point simulation according to their own experiences for aft stern bearing when calculating shafting alignment, comparison was carried out between single-point and multi-point simulation. The results show that the calculation result of multi-point is more accurate, especially for slop boring aft stern bearing. Furthermore, the most widely applied shafting alignment method, jack-up test is accepted as per the bearings load in shafting alignment calculation; inaccurate alignment calculation would lead to huge risk of vessel running hereafter. Therefore, it is strong- ly recommend adopting multi-point simulation for aft stem bearing in large vessel shafting alignment calculation to avoid the risks in shafting alignment installation.