【作者】 周艳秋；

【导师】 洪明；

【作者基本信息】 大连理工大学 ， 船舶与海洋结构物设计制造， 2005， 硕士

【摘要】 随着新型材料和技术在船舶领域中应用,夹层板结构以其优良性能优势,在船舶领域中得到了广泛的应用。夹层板结构是近代发展起来的一种比较先进的结构形式,具有比强度高,比刚度大、重量轻、具有可设计性、易于加工、成型好等特点,这些都是其他材料所不具有的优良性能。但与普通材料相比,这种结构有其自身难以克服的缺点,延伸性小,各向异性显著,内部结构复杂,这些特点使得这种材料的力学特征非常复杂,因此合理的力学性能研究在夹层板结构的开发和应用中发挥着重要的作用,有必要对夹层板结构进行研究。 论文选择夹层板结构为研究对象,通过对结构有限元,阻尼特性以及流固耦合中附加质量计算等基础知识的学习,结合国内外对夹层板结构动力响应研究的现状,对夹层板结构组成的舱段结构进行了动力和频域响应分析,并分析了夹层板结构的损伤问题。论文主要包括以下几个方面: 论文首先在第一章指出了选题背景依据和研究意义,概述了关于夹层板结构研究的历史和现状,并主要介绍了论文研究思路和方法;第二章采用了Reissner和zig—zag假设描述结构的位移场,运用最小位能原理建立有限元方程,结合等参元理论完成四节点夹层板加膜组成的平壳单元的有限元推导,并编制计算程序予以实现。第三章学习了振动系统的动力学解法,包括无阻尼系统,含阻尼系统的模态叠加解法和子空间叠代法两种常用动力学方程解法,并进行了有阻尼结构动力特性和频域响应分析。第四章学习了水下爆炸载荷作用下舰船夹层结构特性分析,介绍了流固耦合问题中附加质量的计算方法,并将各种方法应用到船舶上,提出船舶附加质量的几种计算方法,在本章最后计算了考虑附加质量的船舶舱段在海底爆炸力作用下的静力、动力特性以及频域响应分析。第五章推导了损伤结构的有限元列式,并结合第二章编制的有限元程序设计了一个板架结构,完成了此结构各种含损情况下的特性分析,得出相关的结论。更多还原

【Abstract】 With the widely use of new material and technique in shipbuilding, sandwich plate structure had been widely accepted because of her excellent characteristic. Sandwich plate is a modern structure, which has been developed in recent years, and it has her specific characteristic, which was high stiffness, light, easily to design and quickly molded in contrast with isotropic material. On the other hand, it has it’s own disadvantage, such as anisotropy, hard to extend and complicated, which lead the mechanics to an intricate extend. As a result the study of sandwich plate plays an important role in its research and application. So it’s necessary for us to study it.On the basis of finite element method, damping and calculation of added mass, we make a study of dynamic and response analysis in frequency domain on the sandwich structure with respect to the development of sandwich structure. Then we make a further study of damaged sandwich structure. The following is presented in the article:In the first chapter, we point out the reason and possibility to select this topic and summarize the history and actuality of the sandwich structure, and then we introduce the way and method of the article in the second chapter. Then in Chapter 2, the 4-node quadrilateral shell element is deduced according to the Reissner assumption, then take a example of four-side rigid plate to validate the theory and programmer. In Chapter 3,we devoted to study of dynamic problem in the vibration system, during the course; we introduce the common model of damping, including the linear damping, the nonlinear damping and mode damping. At last, we make a dynamic and response analysis in frequency domain of a cantilever. In chapter 4, the methods to calculate the added mass, including the Morison formula, numerical and experience formula is covered in this chapter. Then point out how to calculate added mass in ship domain. In chapter 5, The influences of damage parameters such as damage position, damage size, damage extension have been discussed to study their influence to structural static and dynamic characteristics. A numerical panel model has been designed and analyzed.更多还原