理性设计论文：基于超单元和支持向量机技术的船舶结构理性设计方法研究.doc

理性设计论文：基于超单元和支持向量机技术的船舶结构理性设计方法研究 【中文摘要】随着运输成本的上升以及运输产品的种类增多,现在的船舶日益向尺度大型化、种类多样化方向发展。单纯依赖于设计者的经验或是简单的规范公式的传统船舶结构设计方法已然难以满足时代的需要。基于计算机技术和优化算法的船舶理性设计方法应运而生,然而,该方法的计算成本较高,一定程度上阻碍了其在实际设计中的应用。针对这一问题,本文做了相应研究并提出了两类减少计算成本的解决方法。本文首先介绍了船舶结构理性设计方法的理念与特点,对比了其与传统的设计方法间的差异与优势。并介绍了国内外研究者针对提高理性设计方法设计效率、降低计算成本做出的研究与贡献。然后,基于前人关于分级计算方法的研究,本文提出了引入超单元技术的新式分级计算方法,该方法不仅可以大幅度降低计算成本,并且还可克服传统分级计算方法对于最小舱长的限制以及计算精度不高的问题。此外,本文引入以支持向量机技术创建元模型(Metamodel)的理念,并以该数学模型代替计算成本较高的数值计算程序,从而实现降低理性设计方法中多次优化迭代的高计算成本。为验证本文提出的两种方法的可行性和高效性,本文以3100箱集装箱船的船中结构作为优化设计对象,应用了以上两种方法,结果证明方法可行且运行效率较高,可以显著缓解理性设计方法在船舶结构设计中计算成本较高的问题。 【英文摘要】The growing demand for more efficient marine transportation has already produced significant changes in ship sizes, types, and production methods. It is hard for to meet the times抮equirement, if the designers only utilize their experience and simple formulas of ship classification rules. Thus, a rational-based method, which relies on computer technique and optimization strategy very much, has been proposed. Nevertheless, its high computation cost constrains its application in the practical design field. To solve this problem, in this paper two remarkable methods have been proposed.To begin with, the thoughts and characters of the rational-based design method have been introduced as well as its comparison with the traditional design method. Besides, the research carried out by domestic and foreign researchers on reducing its computation cost have been introduced specifically.Furthermore, based on the study of multi-level analysis method, a new multi-level analysis method has been introduced on the basis of superelement in this paper. This method cannot only reduce the computation cost sharply, but it can also avoid the limit of minimum length of module and improve the accuracy of the multi-level analysis.Moreover, the advanced thought of utilizing the technique of support vector machine to metamodeling and replacing the exact numerical analysis codes, which are high time cost, has been