螺旋桨在冰桨铣削下的强度计算分析

Calculation and analysis of propeller strength under ice milling

冰区航行时,相比于水动力,螺旋桨冰铣削工况下的冰载荷对螺旋桨的危害更大,故冰区航行对螺旋桨的强度要求较高。本文以显示算法理论为基础,利用ANSYS/LS-DYNA为工具,在模拟球形冰和刚体的碰撞与相关实验对比验证选用的计算方法的正确性后,冰桨铣削工况下的螺旋桨载荷响应进行了模拟研究,计算监视了冰桨铣削过程中桨叶的等效应力、位移响应以及冰的破坏过程并得到分析计算结果。计算结果表明:冰桨铣削过程螺旋桨受到的等效应力主要集中在叶梢及导边区域,应力值在冰桨接触后迅速达到峰值;在铣削过程中叶梢受到的的弯曲变形最为严重,在冰区桨设计环节应着重关注叶梢部分。

When sailing in ice region,the ice load caused by ice milling is more harmful to propeller compared to the hydrodynamic,so ships sailing in ice region need high strength requirements.After analyzing and sorting out relevant research at home and abroad,and based on explicit algorithm,this paper first proved the correctness of the calculation method by comparing related experiment with numerical simulation,then simulated the load response of propeller under the ice milling working condition and got the result of equivalent stress of blade,displacement of blade and the process of the ice breaking.By analysis of the result,this paper concludes that the equivalent stress of ice milling process is mainly concentrated in the tip region and leading edge,the equivalent stress value rapidly will reach the peak once the ice come into contact with propeller,in the milling process the deformation of the tip region is most serious,so designer should focus on the tip part in ice propeller design process.