船用柴油机关键件多学科设计优化方法研究

发布时间：2018-06-03 14:02

  本文选题：船用柴油机 + 多学科设计优化　； 参考：《东南大学》2015年博士论文

【摘要】：随着现代船舶对船用柴油机综合性能要求的提高,要求在其设计开发过程中综合考虑各学科之间的耦合,提高船用柴油机的整体设计水平。本文针对船用柴油机关键件设计优化问题,结合复杂系统建模理论,构建了基于多学科设计优化(Multidisciplinary Design Optimization, MDO)的船用柴油机关键件多学科协同设计总体技术框架,对其涉及的复杂系统建模与分解、多学科优化模型处理、多目标优化决策等关键技术问题进行了研究。在此基础上,结合CAD/CAE/CAO一体化集成的产品协同设计思想,开发了面向船用柴油机多学科设计优化的快速设计集成系统平台,从而有效地支持我国船用柴油机的设计和开发过程。论文开展的主要研究内容和成果包括：(1)基于复杂系统建模理论,提出了船用柴油机关键件多学科协同设计优化总体技术框架,分析了相关关键技术,并建立了多层次的船用柴油机关键件多学科设计优化模型及其求解策略。分析了船用柴油机结构设计涉及的结构强度、振动和热学等学科设计要求,并从“产品级-系统级-部件级-零件级”四个层次对其结构设计的性能耦合与设计分析手段进行解析。(2)针对复杂系统多学科设计优化的学科分析模型的精度问题,提出了考虑复杂结构结合面特性的多学科性能精细化仿真建模方法,并通过静、动力学实验对组合结构的非线性特性进行了系统研究；针对仿真分析模型的可重用性问题,提出了基于主模型的MDO多视图建模方法,实现了基于多视图模型的船用柴油机关键件多学科设计优化。(3)针对多学科设计优化的效率和精度的协调问题,提出了基于数据挖掘和知识发现的多学科优化模型约简方法。结合试验设计和代理模型技术,完成了柴油机运动机构多学科优化模型的简化,实现了船用柴油机等复杂产品多学科优化过程的精度和效率的有效协调。(4)针对多学科设计优化中的目标决策问题,对经典的多目标进化算法进行了比较研究,选取典型测试函数对其Pareto最优化解集的分布性、鲁棒性和运行效率等性能进行综合了评价；提出了基于稳健性设计的多目标组合优化策略,提高了优化算法的搜索效率和优化解的可行性。以船用柴油机凸轮机构的优化设计为对象,验证了多目标优化策略和优化目标决策方法的有效性。(5)针对船用柴油机多学科设计优化的多学科协同和过程集成问题,提出了面向多学科设计优化过程的CAD/CAE/CAO一体化集成技术,开发了船用柴油机多学科设计优化系统平台,实现了复杂产品多学科设计优化过程的集成和模型重用,优化了国内船用柴油机制造企业的设计开发模式。
[Abstract]:With the improvement of the comprehensive performance of marine diesel engine in modern ships, it is necessary to consider the coupling between various disciplines in the process of design and development, so as to improve the overall design level of marine diesel engine. Aiming at the design optimization of key parts of marine diesel engine, combined with the theory of complex system modeling, the overall technical framework of multidisciplinary collaborative design for key parts of marine diesel engine based on multidisciplinary design optimization and multidisciplinary Design Optimization, MDO) is constructed in this paper. The key technical problems such as modeling and decomposition of complex system, multi-disciplinary optimization model processing and multi-objective optimization decision are studied. On this basis, a rapid design integration system platform for marine diesel engine multi-disciplinary design optimization is developed in combination with the product collaborative design idea of CAD/CAE/CAO integration, which effectively supports the design and development process of marine diesel engine in China. The main research contents and achievements in this paper include: (1) based on the theory of complex system modeling, the overall technical framework of multidisciplinary collaborative design optimization for key parts of marine diesel engine is proposed, and the relevant key technologies are analyzed. A multi-level multi-disciplinary design optimization model for key parts of marine diesel engine and its solution strategy are established. The structural strength, vibration and thermal design requirements of marine diesel engine are analyzed. From the four levels of product level, system level, component level and part level, the paper analyzes the performance coupling and design analysis means of its structure design, and aims at the precision of the subject analysis model of multidisciplinary design optimization of complex system. In this paper, a modeling method of multi-disciplinary fine performance simulation considering the characteristics of complex structure interface is proposed, and the nonlinear characteristics of the composite structure are systematically studied by static and dynamic experiments, and the reusability of the simulation analysis model is discussed. A multi-view modeling method of MDO based on main model is proposed. The multi-disciplinary design optimization of key parts of marine diesel engine based on multi-view model is realized. The coordination of efficiency and precision of multi-disciplinary design optimization is realized. A multidisciplinary optimization model reduction method based on data mining and knowledge discovery is proposed. Combined with experimental design and agent model technology, the multi-disciplinary optimization model of diesel engine motion mechanism is simplified. An effective coordination of the precision and efficiency of the multidisciplinary optimization process for marine diesel engine and other complex products is realized. Aiming at the problem of objective decision making in multidisciplinary design optimization, the classical multi-objective evolutionary algorithm is compared and studied. The typical test function is selected to evaluate the distribution, robustness and running efficiency of the optimal solution set of Pareto, and a multi-objective combinatorial optimization strategy based on robust design is proposed. The search efficiency of the optimization algorithm and the feasibility of the optimal solution are improved. Taking the optimization design of marine diesel engine cam mechanism as an example, the effectiveness of multi-objective optimization strategy and optimization objective decision method is verified. An integrated CAD/CAE/CAO integration technology for multidisciplinary design optimization process is proposed. The platform of marine diesel engine multidisciplinary design optimization system is developed, and the integration and model reuse of complex product multidisciplinary design optimization process are realized. The design and development mode of domestic marine diesel engine manufacturing enterprises is optimized.
【学位授予单位】：东南大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：U664.121
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本文编号：1973051