冰桨接触的近场动力学模型  

Peridynamic model for propeller-ice contact

作　　者：叶礼裕 王超[1] 常欣[1] 张洪雨[1] 

机构地区：[1]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2018年第2期222-228,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51379040;51679052);国防基础科研计划项目(JCKY2016604B001)

摘　　要：在冰桨接触过程中,螺旋桨可能承受极端冰载荷的作用,对螺旋桨结构强度以及船舶的安全运行产生严重危害。为了研究冰桨接触过程中载荷的变化情况,本文基于近场动力学方法以及连续接触检测理论,建立了冰桨接触数值预报方法。为反映冰桨接触过程中真实的物理过程,针对冰桨接触问题的特殊性,本文基于接触检测理论建立冰桨接触区域识别算法。采用FORTRAN语言编制了冰桨接触数值预报程序,并以某冰区桨为例,开展冰桨铣削工况下数值预报。计算结果表明:本文建立的方法能够真实地模拟冰桨接触过程,并能获得该过程中冰载荷的动态破碎变化过程。The propeller blades may suffer extreme ice loads during propeller-ice contact process,which is a threat to strength of propeller structure and safe navigation of ships. In order to model the propeller-ice contact process,a numerical method for solving propeller-ice contact problem was developed based on the peridynamic theory and the continuous contact detection method. First,the basic theory of peridynamics was briefly introduced,its application to simulation of propeller-ice interaction problem was discussed. Then,in order to reflect the physical reality in the process of calculation,a contact detection algorithm was developed to prevent the interpenetration of a propeller body and ice material particles. Last,the numerical solution to computing and modeling propeller-ice contact based on peridynamics is written in FORTRAN language. Taking an ice class propeller as an example,propeller-ice contact in milling condition was simulated. The result shows that the current method can capture major characteristics,including dynamic crack generation and propagation of ice sheet,and generation of the ice fragments; the dynamic ice loads can also be calculated.

关 键 词：冰桨接触 近场动力学模型 接触检测算法 冰区桨 切削破坏 冰破碎 冰载荷 激振力 

分 类 号：U661.31[交通运输工程—船舶及航道工程]