摘要多学科优化设计是能够解决当今复杂的工程系统设计的有效方法。而在我国，多学科设计优化技术的研究起步较晚特别是在机械制造业中，一直沿用传统的串行设计优化方法，设计优化方法相对的比较落后。然而传统的结构优化设计无法有效的结合与连接各个学科的特点与优势，同时也存在着许多不确定的影响和隐患，无法满足现在许多复杂情势的需要。这样就会给今后的生产与实际运用带来了诸多不便。51359

所以现代柴油机的设计（包括连杆）不单单沿用单学科的优化分析技术，要加大对柴油机连杆的多学科优化技术研究与使用。本文正是以此为契机，对柴油机的连杆进行了多学科优化。它不仅能够提高产品的质量、降低成本同时还能加快产品的设计与生产时间。所以，运用多学科优化设计会对柴油机包括其零部件的生产带来相当可观的前景，会对传统生产工业注入新的活力。

本文对柴油机的连杆进行多学科优化，先是对其进行强度分析，模态分析，并在分析完成后生成相应的命令流脚本，作为机床多学科设计优化的输入文件。再以Isight软件为平台以多学科优化设计为一定的设计变量，满足一定的约束，选择合适的算法，达到一定的优化目的，使得质量最小化。

毕业论文关键词：多学科优化；柴油机连杆；强度分析；模态分析

Abstract

Multidisciplinary Design Optimization is able to solve today's complex engineering system design an effective manner. In China, multidisciplinary design optimization of a late start in the machinery manufacturing industry in particular, has been in use traditional serial design optimization methods, design optimization method relatively backward. However, the traditional structural optimization can not effectively connect the various disciplines combined with features and advantages, there are also many uncertain impacts and risks, are now unable to meet the needs of many complex situations. This will give the future production and the actual use of a lot of inconvenience.

Therefore, the design of modern diesel engines (including links) is not just follow a single discipline optimization analysis techniques, to increase the diesel engine connecting rod multidisciplinary optimization technology research and use. This article is to take this opportunity, on the diesel engine connecting rod for multidisciplinary optimization. It can not only improve product quality, reduce costs while accelerating product design and production time. Therefore, the use of multi-disciplinary design optimization engine, including its parts would bring considerable prospects for production, traditional manufacturing industries will inject new vitality.

In this paper, the diesel engine connecting rod for multidisciplinary optimization, first its strength analysis, modal analysis, and the analysis is completed script generates the appropriate command stream, as machine multidisciplinary design optimization of the input file. Then Isight software platform designed to optimize multi-disciplinary design variables must satisfy certain constraints, select the appropriate algorithm, optimized to achieve a certain goal, so the quality is minimized.

Keywords: multidisciplinary optimization；engine connecting rod；strength analysis；modal analysis

目  录

第一章  绪论 1

1.1 选题背景 1

1.2 选题的目的和意义 1

1.3 国内外研究现状及发展趋势 3

1.4 本文的研究内容 4

1.5 本章小结 5

第二章  柴油机连杆的多学科分析