冰载荷作用下破冰船船首结构动态响应研究
时间:2020-10-21 20:09 来源:毕业论文 作者:毕业论文 点击:次
| 摘 要 近年来，全球气候变暖导致极地冰川融化加剧，使极地海洋资源的开发利用成为可能，极地航道的开通逐渐成为人们研究的热点话题。在这样的背景之下，破冰船逐渐显示出其重要的价值，尤其是在开辟新航道、进行极地救援和物质运输等方面，扮演着重要角色。通过船首顶撞冰层的方式破冰是现代破冰船进行破冰的主要形式之一,基于这种破冰形式，本文对冰载荷作用下破冰船船首结构动态响应展开了研究。 本文以一艘 60.6 米长的破冰船为研究对象，通过显示动力分析软件ANSYS/LS-DYNA 建立有限元模型并模拟仿真破冰船的破冰过程，记录船首结构的碰撞力时历曲线图上最大碰撞应力的大小以及时刻，并分析其动态响应。具体研究工作如下： （1） 简要探讨极地航道的开发利用以及破冰船对此的重要意义，分析国内外对破冰船、冰体、以及船-冰碰撞的研究现状。 （2） 分析有限元法的理论知识，研究船-冰碰撞采取的材料模型及其参数设置，概述显示动力分析软件ANSYS/LS-DYNA 的使用方法。 （3）选取不同的工况进行对比分析。 （4）运用ANSYS模块建立有限元模型，并用LS-DYNA 模块对破冰船破冰过程进行模拟仿真，得到船首结构的碰撞力以及结构吸能等结果。 （5）分析冰载荷作用下破冰船船首结构动态响应。 58408 毕业论文关键词：破冰船；船-冰碰撞；冰载荷；有限元法；动态响应 Abstract In recent years, global warming accelerates polar ice melting, the exploitation and utilization of polar marine resources being possible, and the opening of the polar waterway has become a focus of research. Icebreaker gradually shows its benefit in this situation, playing a significant role especially in the aspects of exploring new routes, Polar rescue and the transportation of material. Bow hitting ice is one of the main forms of modern icebreaker breaking ice, based on which the structure dynamic response of icebreaker bow under ice load is studied in this paper. With a 60.6-metre-long icebreaker as the research object, the dynamic analysis software ANSYS/LS-DYNA is used to establish finite element model and display the simulation of the ice breaking process of the icebreaker. Also, the maximum impact stress and time are analyzed on the force-time curve of the icebreaker bow, with the structure dynamic response of which being analyzed. The main contents are listed as follows: 1. A brief discussion is made on the polar route utilization and the significant of icebreaker, with the research status being analyzed for icebreakers, ice, and ship-ice collision at home and abroad. 2. The theory of finite element method is analyzed in this paper and the material model and its parameters settings of ship-ice collision are researched. Then the method of using the dynamic analysis software ANSYS/LS-DYNA is summarized. 3. The comparison and analysis of different working conditions are carried out. 4. ANSYS is used to establish finite element model, and LS-DYNA is used to simulate the process of icebreaker breaking ice, following which the impact stress and the internal energy of the bow structure are obtained. 5. The structure dynamic response of icebreaker bow under ice load is analyzed. Keywords: Icebreaker; ship-ice collision; ice load; finite element method; dynamic response 目录 第一章绪论1 1.1研究背景及意义.1 1.2破冰船概况2 (责任编辑：qin) |