艉轴大跨距轴系校中计算  

Shafting alignment calculation of large span propeller shafts

作　　者：谷志明 付宇 李珍 杨蓬勃 GU Zhi-ming;FU Yu;LI Zhen;YANG Peng-bo(Guangzhou Marine Engineering Corporation,Guangzhou 510250,China)

机构地区：[1]广州船舶及海洋工程设计研究院,广州510250

出　　处：《船舶力学》2024年第3期435-441,共7页Journal of Ship Mechanics

基　　金：广州船舶及海洋工程设计研究院“沿海钢铝混合单体豪华游船设计”(GCY4131)。

摘　　要：中、小型船舶吃水较浅,其螺旋桨转速快、直径小、重量轻,一旦艉管前后轴承跨距较大,艉管后轴承支点位置就将超出标准给定的范围。本文基于有限元法,将轴系简化为Timoshenko梁单元建立有限元模型,考虑船舶轴系实际安装间隙和基于赫兹接触理论计算的载荷-刚度曲线,使用不同支撑位置和多种支撑模型对艉轴大跨距轴系进行校中计算对比。研究发现,对于艉轴大跨距的轴系,CB/Z 338-2005中对艉管后轴承支点位置的取值已不适合。如果轴承支点选取准确,则单点刚性支承、单点弹性支承、多点非线性弹性支承的轴承负荷计算结果相近。Small-and medium-sized ships have a shallow draft,but their propellers are fast in speed,small in diameter and light in weight.Once the span of the front and after stern tube bearings is large,the position of the after stern tube bearing fulcrum will exceed the range given by the standard.Based on the finite ele⁃ment method,the shafting was simplified into Timoshenko beam element to establish a finite element model.Considering the actual installation clearance of the ship shafting and the load stiffness curve calculated based on Hertz contact theory,the shafting alignment calculation of large span propeller shaft,which was based on different support positions and various support models,indicates that for the shafting with a large span of pro⁃peller shaft,the value of the fulcrum position of stern tube rear bearing in CB/Z 338-2005 is not suitable.If the bearing fulcrum exactitude is correct,the calculated bearing loads of single point rigid support,single point elastic support and multi-point nonlinear elastic support will have a similar result.

关 键 词：轴系校中 艉轴大跨距 赫兹接触 轴承刚度 

分 类 号：U664.21[交通运输工程—船舶及航道工程]