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在多学科设计优化集成系统中,设计过程和优化求解算法均通过可视化工作流实现,工作流有效性验证对提高设计效率和提高系统的用户体验具有重要意义。当前验证方法主要针对办公自动和企业管理系统中的工作流验证问题,多学科设计优化集成系统中的工作流验证问题研究较少。在分析前期工作验证技术的基础上,针对以循环结构为特征的优化环,提出一种基于图论方法的,名为浓缩环(concentration-loop)的验证算法。结合发射平台数字化设计系统的设计与实现,对该算法进行了验证。 相似文献
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随着对螺旋桨性能要求的不断提高,螺旋桨设计面临着多目标、多学科综合提高的难题.在iSIGHT多学科优化设计平台上,采用试验设计方法和与基于响应面模型的逼近方法相结合的优化方法而建立的设计工程,不但完成设计过程的自动化和智能的设计探索,而且确定最佳设计参数使螺旋桨效率和最小压力系数都有提高,实现了优化设计的目的. 相似文献
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武友德 《计算机辅助设计与制造》2008,(2):28-29
传统的设计优化一般主要受到某一个性能或学科的影响,因此造成整体设计优化的结果不理想,甚至互相矛盾,这就使设计优化必然走向系统和总体的设计优化。随着计算技术的发展,人们开始尝试将多学科的设计综合在一起,进行多学科协调优化。本文研究了多学科协同与设计优化的关键技术,为进行多学科协调优化奠定了基础。 相似文献
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吸气式高超声速飞行器多学科优化设计研究 总被引:1,自引:0,他引:1
在冲压发动机推进特性问题的研究中,高超声速飞行器是一种多学科强耦合的先进飞行器,传统的设计方法一般只考虑某一个性能和学科,造成设计性能不理想,而多学科优化设计(MDO)能够探索和充分利用工程系统中的协同机制来实现复杂飞行器的设计.为优化推进技术,完善设计,提高航程,用多学科优化设计方法对高超声速飞行器进行了优化设计.建立了包括空气动力学、推进系统、结构质量以及弹道航程等多个学科模型在内的多学科优化平台.进行仿真,结果表明满足各个学科约束的条件,使得飞行器的航程提高 12.94%.同时也说明文中针对高超声速飞行器搭建的多学科优化平台是可行的,为优化设计提供厂保证. 相似文献
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由于管理信息系统的结构越来越复杂、影响因素越来越多,根据人机交互方法研究管理信息系统具有十分重要的理论意义和应用价值.针对管理信息系统人机交互问题,提出了一种遗传神经网络方法,采用具有高度非线性映射能力的结构化神经网络来拟合管理信息系统人机交互模型的输入输出关系,利用具有全局寻优能力的遗传算法来训练结构化神经网络的参数,应用遗传算法对神经网络模型进行优化设计.上述方法从遗传算法的优化过程中抽取一些知识,采用知识来指导遗传算法的后续优化过程. 相似文献
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基于iSIGHT平台DOE方法的螺旋桨敞水性能优化设计 总被引:4,自引:0,他引:4
传统的螺旋桨设计方法已经满足不了进一步提升其性能的要求,并且现代环境的变化不再仅仅要求螺旋桨某一性能的最优,而是多方面综合性能的最优.iSIGHT多学科优化设计平台提供了完整的设计综合环境和先进的优化设计方法,能够完成设计过程的自动化和智能的设计探索,确定最佳设计参数.基于iSIGHT平台的实验设计方法建立的螺旋桨敞水性能优化方法使螺旋桨效率和最小压力系数都有提高,实现了优化目的. 相似文献
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支持多学科设计优化的集成产品过程建模方法 总被引:1,自引:0,他引:1
针对当前主要的设计过程建模方法缺乏表达复杂产品多学科设计过程中资源的组织调用和协作方式等信息,提出一种支持复杂产品多学科设计优化的设计路线图框架过程建模方法.从全面表达设计过程信息的角度出发,描述产品多学科设计优化过程中的主要活动及其协同关系,建立支持多学科设计优化的过程模型;在此基础上,给出了多学科设计优化的过程规划方法,以降低产品设计过程中的迭代,通过构建支持多学科设计优化的集成产品设计过程结构框架,实现产品多学科设计优化的过程集成.最后通过已开发的多学科系统集成平台,应用具体设计实例验证了整套方法的有效性. 相似文献
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多学科优化设计(MDO)是当前复杂系统工程设计中研究最活跃的领域.分析了标准多学科协同优化算法解决实际复杂MDO问题计算困难的原因,提出了基于试验设计的近似模型和智能优化的协同优化算法(NCO).NCO算法继承了标准协同优化分布并行的思想,采用现代智能算法优化系统级减小优化陷入局部解的可能性,以试验设计为基础的高精度近似模型代替学科真实模型降低计算成本,平滑数值噪声.通过经典MDO测试算例与Alexandrov提出的改进松弛协同优化比较,优化结果表明,NCO能有效提高收敛速率,保证收敛结果的稳定性和可靠性,能更好地满足复杂系统工程优化需要. 相似文献
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With higher reliability and safety requirements, reliability-based design has been increasingly applied in multidisciplinary
design optimization (MDO). A direct integration of reliability-based design and MDO may present tremendous implementation
and numerical difficulties. In this work, a methodology of sequential optimization and reliability assessment for MDO is proposed
to improve the efficiency of reliability-based MDO. The central idea is to decouple the reliability analysis from MDO with
sequential cycles of reliability analysis and deterministic MDO. The reliability analysis is based on the first-order reliability
method (FORM). In the proposed method, the reliability analysis and the deterministic MDO use two MDO strategies, the multidisciplinary
feasible approach and the individual disciplinary feasible approach. The effectiveness of the proposed method is illustrated
with two example problems. 相似文献
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Integrating linear physical programming within collaborative optimization for multiobjective multidisciplinary design optimization 总被引:2,自引:1,他引:1
C.D. McAllister T.W. Simpson K. Hacker K. Lewis A. Messac 《Structural and Multidisciplinary Optimization》2005,29(3):178-189
Multidisciplinary design optimization (MDO) is a concurrent engineering design tool for large-scale, complex systems design that can be affected through the optimal design of several smaller functional units or subsystems. Due to the multiobjective nature of most MDO problems, recent work has focused on formulating the MDO problem to resolve tradeoffs between multiple, conflicting objectives. In this paper, we describe the novel integration of linear physical programming within the collaborative optimization framework, which enables designers to formulate multiple system-level objectives in terms of physically meaningful parameters. The proposed formulation extends our previous multiobjective formulation of collaborative optimization, which uses goal programming at the system and subsystem levels to enable multiple objectives to be considered at both levels during optimization. The proposed framework is demonstrated using a racecar design example that consists of two subsystem level analyses — force and aerodynamics — and incorporates two system-level objectives: (1) minimize lap time and (2) maximize normalized weight distribution. The aerodynamics subsystem also seeks to minimize rearwheel downforce as a secondary objective. The racecar design example is presented in detail to provide a benchmark problem for other researchers. It is solved using the proposed formulation and compared against a traditional formulation without collaborative optimization or linear physical programming. The proposed framework capitalizes on the disciplinary organization encountered during large-scale systems design. 相似文献
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Comparison of MDO methods with mathematical examples 总被引:1,自引:0,他引:1
Recently, engineering systems are quite large and complicated. The design requirements are fairly complex and it is not easy
to satisfy them by considering only one discipline. Therefore, a design methodology that can consider various disciplines
is needed. Multidisciplinary design optimization (MDO) is an emerging optimization method that considers a design environment
with multiple disciplines. Seven methods have been proposed for MDO. They are Multiple-discipline-feasible (MDF), Individual-discipline-feasible
(IDF), All-at-once (AAO), Concurrent subspace optimization (CSSO), Collaborative optimization (CO), Bi-level integrated system
synthesis (BLISS), and Multidisciplinary design optimization based on independent subspaces (MDOIS). Through several mathematical
examples, the performances of the methods are evaluated and compared. Specific requirements are defined for comparison and
new types of mathematical problems are defined based on the requirements. All the methods are coded and the performances of
the methods are compared qualitatively and quantitatively. 相似文献
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针对解析目标分流(analytical target cascading,ATC)与协同优化(collaborative optimization,CO)方法对比及ATC方法在卫星多学科设计优化(MDO)中的应用等问题,研究ATC与CO方法的原理差异;将其应用到两个数学解析算例,通过对比ATC与CO方法在优化过程中系统、子系统问题以及全部问题所需的函数运算次数,可以看出ATC方法可以大大减少子系统问题函数运算次数,计算效率较高.采用ATC方法求解某观测卫星MDO问题得到合理结果,表明了ATC方法的有效性,可为同类航天器MDO问题求解提供参考. 相似文献
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This paper presents an efficient metamodel-based multi-objective multidisciplinary design optimization (MDO) architecture for solving multi-objective high fidelity MDO problems. One of the important features of the proposed method is the development of an efficient surrogate model-based multi-objective particle swarm optimization (EMOPSO) algorithm, which is integrated with a computationally efficient metamodel-based MDO architecture. The proposed EMOPSO algorithm is based on sorted Pareto front crowding distance, utilizing star topology. In addition, a constraint-handling mechanism in non-domination appointment and fuzzy logic is also introduced to overcome feasibility complexity and rapid identification of optimum design point on the Pareto front. The proposed algorithm is implemented on a metamodel-based collaborative optimization architecture. The proposed method is evaluated and compared with existing multi-objective optimization algorithms such as multi-objective particle swarm optimization (MOPSO) and non-dominated sorting genetic algorithm II (NSGA-II), using a number of well-known benchmark problems. One of the important results observed is that the proposed EMOPSO algorithm provides high diversity with fast convergence speed as compared to other algorithms. The proposed method is also applied to a multi-objective collaborative optimization of unmanned aerial vehicle wing based on high fidelity models involving structures and aerodynamics disciplines. The results obtained show that the proposed method provides an effective way of solving multi-objective multidisciplinary design optimization problem using high fidelity models. 相似文献