摘要：Much research effort has been devoted to economic design of X ＆ S control charts,however,there are some problems in usual *** the one hand,it is difficult to estimate the relationship between costs and other model parameters,so the economic design method is often not effective in producing charts that can quickly detect small shifts before substantial losses occur;on the other hand,in many cases,only one type of process shift or only one pair of process shifts are taken into consideration,which may not correctly reflect the actual process *** improve the behavior of economic design of control chart,a cost ＆ loss model with Taguchi＇s loss function for the economic design of X ＆ S control charts is embellished,which is regarded as an optimization problem with multiple statistical *** optimization design is also carried out based on a number of combinations of process shifts collected from the field operation of the conventional control charts,thus more hidden information about the shift combinations is mined and employed to the optimization design of control *** the same time,an improved particle swarm optimization（IPSO） is developed to solve such an optimization problem in design of X ＆ S control charts,IPSO is first tested for several benchmark problems from the literature and evaluated with standard performance *** results show that the proposed algorithm has significant advantages on obtaining the optimal design parameters of the *** proposed method can substantially reduce the total cost（or loss） of the control charts,and it will be a promising tool for economic design of control charts.

摘要：To collect and share information of projects or products and make it consistent and correct so that the quality and costs of projects can be effectively controlled,an integrative project architecture integrating different types of breakdown structures is *** this paper,the international research status on work breakdown structure(WBS)was analyzed,and an integrative project architecture for commercial aero-engines was designed,where product breakdown structure(PBS),WBS,organization breakdown structure(OBS)and cost breakdown structure(CBS)were integrated and *** the architecture was applied in information systems.A transfer from technological views of complex products through their lifecycles to management views has been realized with this standardized architecture,thus development tasks and costs can be controlled.

摘要：实例库维护是基于实例的推理方法中的一项核心工作,目前国内外关于实例库维护方法的研究还存在一些不足.针对机械产品设计实例的特点,提出一种基于模糊粗糙集理论的实例库维护方法.首先定义了产品设计实例特征权重计算、实例库族集的划分以及实例属性的约简方法;在此基础上,引入覆盖度和可触及方法对典型实例进行筛简.最后开发了面向工程机械设计的实例库维护系统,并给出了具体应用效果.

摘要：在分析当前主流基于模型系统工程(MBSE)设计方法的基础上,针对商用航空发动机研制的复杂性及其系统设计中需求分析与物理模型交互难的问题,提出一种面向航空发动机全生命周期运行场景的MBSE设计方法。结合商用航空发动机设计研发特点,构建了一套面向全生命周期运行场景的MBSE设计流程,基于发动机全生命周期运营阶段、内外部环境、状态模式3个维度组合的场景全面捕获系统需求;基于可扩展标记语言的数据交换格式,对SysML模型和Modelica模型转换技术进行研究,实现了从需求模型到物理性能模型的转换,从而支撑基于同一架构开展系统功能和性能设计,进而建立面向商用航空发动机运行场景的一体化多学科仿真环境,实现对商用航空发动机研制需求的闭环验证。以某型号大涵道比涡扇航空发动机的地面起动场景为例,验证了所提方法和技术的可行性与有效性。

摘要：在对产品设计知识应用特征分析的基础上,研究了支持设计知识建模的任务结构模型及建议-评估-修改方法,和支持标准型、变型及系列产品设计知识的统一产品设计任务分解结构(用树状与或图表示)。提出了4层结构的产品设计知识模型,实现了多种知识表示方法下复杂产品设计知识的分层与分类表示。为解决设计知识获取问题,设计了产品设计知识获取工作表,对设计知识进行了规范说明和瓶颈分析。最后,建立了路面摊铺机设计知识模型。

摘要：为了提高数控加工的加工效率和精度,提出一种利用特征刀位点的NURBS刀轨生成算法.采用截平面和三角网格模型的等距模型求交来计算直线刀轨的刀位点,由等距模型的顶点曲率估算刀位点处沿刀轨和刀轨间隔方向的曲率半径,并根据残留高度确定刀轨行距;对基于特征刀位点的NURBS曲线拟合算法进行改进,采用阈值分割的方法选取初始特征刀位点,采用相邻直线段夹角最大原则确定新特征点,并用刀位点的投影点参数对特征点参数进行修正.采用文中算法对直线刀轨的刀位点进行NURBS曲线拟合,并在刀轨行间采用NURBS曲线过渡,以减小数控程序量并提高刀轨光顺性.实验结果表明,文中算法效率高,采用其生成的刀轨具有较少的控制顶点、较高的拟合精度以及较好的光顺性.

摘要：遗传算法有时收敛太慢或收敛困难。在翼型反设计问题中,算法的计算效率很重要。给出了翼型的非均匀B样条曲线表示,设计了遗传操作算子,引入一种简单、易实现、高效率的随机逼近算法——Simultaneous Perturbation Stochastic Approximation(SPSA)算法,将SPSA算法作为一种快速局部优化方法和遗传算法的整体搜索策略结合起来,为翼型反设计提出了一种快速高效优化算法。并用该算法分别对NACA2412和NACA0016翼型进行了反设计,取得了令人满意的结果。

摘要：Based on the case-based designing (CBD), it is presented that the similarity of the fixtures is described by the fixture information of workpiece and the structure information of feature. Then, the computer-aided fixture design system is created on case-based reasoning (CBR), in which the attributes information of the main features of workpiece and structure of fixture as case index code are designed for the retrieve of the similar cases, and the structure and hierarchical relation of case library are set up for store. Meanwhile, the algorithm based on the knowledge-guided in the retrieve of the similar cases, the strategy of case adaptation and case storage in which the case identification number is used to distinguish from similar cases are presented. The application of the system in some projects improves the design efficiency and gets a good result.

摘要：针对复杂产品设计领域多学科交叉、知识资源数量庞大导致的知识重用与共享困难等问题,提出以专业领域维度划分为依据的知识表示方式,以领域本体为语义模型,实现产品设计知识结构化、维度化的表示。设计了一套针对设计文档的自动语义标注框架,以领域本体为框架底层,提出多影响因子综合加权的概念语义相似度来提取概念间的语义关系,并引入语义增量提取文档中的关键词权重特征,完成对知识的语义标注。通过雷达设计知识管理系统中知识自动标注、录入验证了所提方法的有效性。

摘要：针对基于实例推理的设计方法实例修改自动化程度较低的情况,对夹具实例自动化修改中的变型设计过程进行了研究。为了适应夹具变型设计,在对夹具元件信息进行完整描述的基础上,提出了基于特征套件的夹具模型描述方法。以此模型为基础,通过对工序件特征的相似性比较和对约束完整性的求解,在几何推理的基础上实现了基于特征的夹具自动化变型设计。该方法可以用于实例自动重用问题,为夹具自动化设计探索了一种新途径。