【作者】 吴宝贵；

【导师】 黄洪钟； 孙伟；

【作者基本信息】 大连理工大学 ， 机械设计及理论， 2008， 博士

【摘要】 高效精密化、智能集成化、虚拟数字化是现代机械产品设计的发展方向,为了以尽可能高的效率获得复杂机械产品尽可能优的设计方案,提出将航空领域发展起来的多学科设计优化方法应用于复杂机械产品设计领域,探索并研究出一种基于虚拟样机技术,融合多学科设计优化方法的现代产品数字化设计方法。深入研究并归纳总结了多学科设计优化的技术要素,形成面向机械设计领域比较完善的多学科设计优化技术应用体系。针对多领域CAD/CAE建模中存在的视图一致性难题,提出以主模型视图为导向的多学科视图建模技术。探讨多学科视图模型之间协调一致的保证体系,消除多学科视图模型的动态冲突,保证多学科视图模型之间动态交互与信息共享。通过创立支撑产品设计的参数化模型以及可对产品性能进行优化设计的虚拟样机,来实现对国外产品及专利的引进、消化、吸收和再创新。应用共享网格技术,解决数字化环境下多学科CAE视图模型耦合仿真的难题。探索将多学科设计优化方法具体融入复杂机械产品的数字化设计流程,分析了产品设计不同阶段多学科设计优化的应用特征。通过将多学科设计优化方法与虚拟样机设计流程融合,提出一种新的虚拟样机多学科优化设计模式,构建了以虚拟样机为核心的产品多学科设计优化集成平台,给出虚拟样机多学科设计优化的集成分析流程,实现机械产品的多学科集成自动化设计,解决复杂机械产品多性能动态优化问题,为产品的数字化设计提供了更高层次的应用平台。通过商用软件集成化组装,提出复杂机械产品多学科设计优化的集成平台解决方案,实现通用软件专业化应用的目的,为现代产品的一体化设计提供了比较完善的实施方案,使传统设计模式向并行化、一体化的先进模式转化。提出应用多学科设计优化方法设计汽车这一新思想。研究将多学科设计优化方法具体应用到汽车设计的不同阶段,给出汽车多学科集成分析与优化流程,实现汽车多性能的集成全分析与优化仿真。对照传统的螺杆压缩机经验设计,提出基于多学科设计优化的新型螺杆制冷压缩机多学科集成化设计模式。通过建立工作过程的流场仿真模型、结构有限元分析模型和流固耦合分析的多学科数字化仿真模型,创立可以全面分析螺杆压缩机工作特性的多学科模型系统,进一步研究并实施新型螺杆制冷压缩机产品的设计、分析与优化、仿真相集成的一体化,为实现复杂机械产品的传统设计向预测设计的转变进行了有意义的尝试。更多还原

【Abstract】 Efficient, precise, intelligent, integrated, virtual and digital is the design trend of modern complex mechanical product. In order to seek the optimal design as efficiently as possible, multidisciplinary design optimization (MDO) is introduced to use from aviation field into mechanism design aereas. An effective new digital design optimization technique is explored based on profound research of merging MDO into virtual prototyping technologies.A new architecture of MDO application in mechanical design domain is established during thoroughly research on MDO technical essential factors, and a complete generalized MDO procedure of complex products is put forward. Aimed at solving the inconsistence of CAD/CAE multi-domain models, the multidisciplinary view-modeling technique is proposed, directed by the master view-model. Assurance architecture to keep the essential coherence among multidisciplinary models is discussed to eliminate the redundant connections and dynamic conflictions. The dynamic interaction and information sharing between multidisciplinary view-model is guaranteed. Virtual prototype (VP) is constructed to support assimilation and innovation of import product and technology based on product parameterization model. By means of grid sharing, the problem of multidisciplinary CAE software coupling simulation is solved.How to merge the MDO method into digital design procedure of complex mechanical product is investigated, and the application characteristic of MDO at different stage is analyzed. By integrating MDO techniques into virtual prototyping technology, a new kind multidisciplinary optimization design pattern of virtual prototype is proposed, the MDO integrated design system is constructed centered on functional VP. Then, an integrated MDO analysis procedure of VP is presented, and multidisciplinary integrated automatic optimum design of virtual products is realized. The problem of multi-performance dynamic optimization of product system is settled. Therefore, a higher level platform for complex products design is provided. After further discussion, an integrated pattern of complex product including design, analysis, optimization, and simulation is brought forward. Based on the idea of integrative assembly of generic software, an integrated platform for complex product MDO is constructed, which provides a solution for the integrated design of modern product and achieves the goal of specialized application with generic software. A new design method to use MDO in vehicle design is proposed and its specific application character in different design stage is also defined. Complete analysis and optimized simulation of multi-performance is realized through integrated analyzing and optimizing flow of vehicle MDO. Further, compared with the traditional empirical design of screw compressor, an integrated multidisciplinary design pattern is put forward to develop the new style twin-screw refrigerating compressor based on MDO. Through mixing the CFD model, FEA model and FSI coupling models together to construct the multidisciplinary functional virtual prototype models simulation system of screw compressor, operating characteristic can be fully simulated. And then, the meaningful transformation of complex mechanical product design from traditional mode to the forecast design is partially achieved.更多还原