冰载荷作用下破冰船船首结构动态响应研究
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