基于Pro/Toolkit的锻压机床装配模型快速设计

为了快速响应市场需求,提高设计效率,针对锻压机床产品少批量、多种类、设计周期长等特点,利用模块化技术分析锻压机床产品,提出基于Pro/Toolkit技术的锻压机床产品装配模型的快速设计体系,分析模块划分、模块设计、产品建模、产品装配等相关技术。实例验证了该系统的各项技术,并给出设计过程与结果。     

An extended model of design process of lean production systems by means of process variables

In this paper, we present an axiomatic modeling of lean production system design, using process variables (PVs). So far, we had developed a model for conceptual design of lean production systems by means of FR–DP relationships, the key characteristics of axiomatic design (AD) methodology, appeared in the proceedings of Second International Conference of Axiomatic Design. Albeit the model in question was thorough enough to be applied in various cases, its embedded abstract principles hamper straightforward applications and the required resources, tools, and techniques are not clarified. In AD terms, it lacks PVs created by mapping the design parameters (DPs) to the process domain to clarify the means that produce the specified DPs. Owing to the difficulties involved in the definition of PVs for manufacturing systems, there is few works in this area. This paper is an attempt to introduce PVs in production system design. When we are developing a product (i.e. a part), we can simply interpret the set of PVs as the process design. In the case of a production system we interpret PVs as the tools, methods, and resources, required for implementing a lean production system. In this paper, according to AD methodology, we have developed a hierarchical structure to model the design process of a lean production system, composed of FRs, DPs, and PVs. Serving as an efficient guideline for the design process and clarifying the required tools, methods, and resources, this structure is general enough to be applied for different cases.     

The design process of expert systems development: some concerns

Abstract: A discussion is presented of why some expert systems that organizations have developed are not successful. The concept of design process plays a very significant role at the outset of the expert system development process. This concept has not been the subject of much debate and attention in expert systems development. From the author's point of view, one of the main issues is how the designer (knowledge engineer) thinks about the design process. In general, the designer's process is influenced by the knowledge engineer's conception. This paper endeavors to disclose some of the main factors related to the knowledge engineer's conception of the design process and an attempt is made to put forward a conceptual model of the expert system design process. This conceptual model is an initial step towards a successful implementation of expert system projects.     

三维鞋样交互设计方法研究

提出了一种在三角网格鞋楦模型上生成三维帮样曲线的离散表示及其交互编辑修改方法。基于改进的能量模型对鞋楦曲面的选择区域进行展平,利用展平过程建立的三维帮面与展平后二维帮面间的拓扑对应关系,实现鞋样曲线在三维空间与二维展平空间的实时关联;所生成的二维帮样曲线以3次非均匀B-spline表示,并以DXF格式输出,便于其他程序调用。算例结果显示,本文方法具有交互性好、实时直观的优点,能够满足基于楦型的帮样交互设计要求。     

翻转机构驱动力的优化及Adams仿真验证

在某航天器装配平台中,需要设计一个翻转机构实现部件与总体结构的对接工作,其中,外舱板翻转机构的驱动系统设计是重要内容之一.从外舱板翻转系统中外舱板翻转机构驱动力的设计出发,通过对特定负载的分析和理论分析,得到驱动力的大小以及驱动系统安装的最优位置.采用Adams的优化分析功能,以驱动系统安装位置为设计变量,以外舱板翻转机构在翻转过程中所需的最大驱动力中的最小值为目标函数,进行驱动系统的最优化仿真分析.应用Adams对优化设计结果进行仿真分析验证,得到最优结果.     

基于Authorware的多媒体教学软件设计研究

提出多媒体教学软件的框架模型，论述基于Authorware的多媒体教学软件的设计过程。并以EC实例给出教学系统结构、教学内容文件网络结构、软件详细设计及教学测试系统框架、功能。     

分层构造方法在建筑平面布局中的应用

分层构造的自动造型方法针对方案设计过程由抽象到具体、由模糊到精确的特点，支持从概念到形状的方案设计全过程。分析了建筑平面布局设计过程中不同抽象层次和不同求解阶段的特点，应用分层构造的方法建立了一个以辅助方案设计为核心的建筑平面布局CAD实验系统。     

SplineLearner: Generative learning system of design constraints for models represented using B-spline surfaces

Product design involves a computer-aided design (CAD) model with its design (dimensional) parameters. A generative design (GD) system can then be utilized to generate new designs by modifying these parameters. There is a need for a GD system to determine the visual validity of a design that is obtained after parametric modification. In this context, this paper introduces an approach to learn visual (i.e., design) constraints of a CAD model (represented using B-spline surfaces) by means of user feedbacks. A deformation technique (utilizing modification and limit curves) for B-spline surfaces is first introduced, which involves a few design (deformation) parameters. Via a generative learning process, the proposed system, SplineLearner, generates random designs, which are shown to user(s) for visual validity classifications. In a machine learning step, a mathematical model is computed that can perform prediction for a design to be valid or not. The mathematical model is also integrated into SplineLearner (after some user interactions) to prevent imbalances between the numbers of valid and invalid designs. As a proof of concept, B-spline surface models of a car body parts (hood, roof, side and trunk) are utilized, and two user studies are conducted to demonstrate the efficacy of the proposed method.     

基于VB6.0和单片机下串行通信技术的应用开发

结合某液体压力轴承测试系统 ,详细介绍了在 VB6 .0与单片机中关于串行通信的程序设计方法 ,给出了详细的设计步骤及实现过程 ,并结合具体实例加以说明。产品进入市场反应很好 ,代码具有通用性 ,稍加改动即可用于其他系统。     

炼油企业全厂生产计划系统设计与开发

采用面向对象方法,使用统一建模语言进行炼油企业生产计划系统的需求分析和系统设计。首先描述了生产计划系统的功能需求,包括数据管理、模型管理、模型发生器和过程分析等,并且采用序列图初步分析了系统核心功能生产计划的实现过程。在此基础上,进行系统的数据模型设计,包括公用数据模型,装置数据模型和物流数据模型。上述数据模型描述了炼油企业生产流程的静态结构和生产计划活动的信息。最后开发了软件OpTechPlan,并且在中国北方某炼油企业得到了初步的应用。     

基于主模型的协同设计软件架构技术研究

运载火箭总体方案论证过程中,由于涉及专业多、专业间迭代交互频繁、设计方案多变等特点,容易造成多专业协同设计时版本与技术状态的不统一,需要研究针对运载火箭产品的通用建模方法,并开发相应的软件系统;基于统一数据源的协同设计理念,结合运载火箭总体设计与数据模型特点,通过定义基础信息模型、概念模型、参数模型、外部定义模型4种数据模型,提出了针对运载火箭产品的通用主模型构建方法;将此通用建模方法软件化,搭建了基于主模型的协同设计软件系统整体架构;此架构包含主模型管理系统、主模型建模工具及应用客户端三部分,实现了多专业协同设计过程中数据与版本的统一管理、技术状态一致性分析、谱系追踪、数据展示与应用等功能;该主模型建模工具与客户端软件系统的实现,为运载火箭的总体协同设计提供了工具支撑。     

基于领域驱动设计的物业管理系统建模研究

领域模型是指软件领域中具有静态特征和动态行为的事物。该文首先讲述领域驱动建模的相关内容,然后具体描述如何使用领域驱动建模方法完成物业管理系统的分析与设计,最后阐述建立系统领域模型的过程。     

数据库系统设计中的面向对象技术研究

基于面向对象技术的基本思想和开发过程,介绍了面向对象技术的实现方法.结合具体实例对面向对象技术在数据库系统结构设计和详细设计中的应用进行了详细的探讨,利用面向对象的数据库系统分析和设计方法,使用UML工具建立了具体的对象模型,给出了一种比较通用的数据库系统开发模式.使用该模式设计的系统重用性好,且易于维护,从而有效提高了数据库系统的开发质量.     

办公信息系统集成子系统问题的研究

集成控制系统是办公自动化的先进模式,采用集成系统辅助办公操作流程是技术创新趋势。分析了办公信息系统集成控制模式的特点,对子系统结构设计与执行操作等问题展开研究。     

基于虚屏技术的ActiveX曲线控件的设计

本文介绍了采用ActiveX控件方式,实现基于虚屏技术绘制工程实时监控曲线的方法。控件的设计对于软件的构建化和模块重用具有很重要的意义。文最后介绍了设计过程中遇到的一些问题及解决方法。     

A geometric modelling framework for conceptual structural design from early digital architectural models

Computer support for conceptual structural design is still ineffective. This is due, in part, to the fact that current computer applications do not recognize that structural design and architectural design are highly interdependent processes, particularly at the early stages. The goal of this research is to assist structural engineers at the conceptual stage with early digital architectural models. This paper presents a geometric modeling framework for facilitating the engineers’ interactions with architectural models in order to detect potential structural problems, uncover opportunities, respect constraints, and ultimately synthesize structural solutions interactively with architectural models. It consists of a process model, a representation model and synthesis algorithms to assist the engineer on demand at different stages of the design process. The process model follows a top-down approach for design refinements. The representation model describes the structural system as a hierarchy of entities with architectural counterparts. The algorithms rely on geometric and topologic relationships between entities in the architectural model and a partial structural model to help advance the synthesis process. A prototype system called StAr (Structure-Architecture) implements this framework. A case study illustrates how the framework can be used to support the conceptual structural design process.     

A robust and accurate geometric model for automated design of drawbeads in sheet metal forming

A robust and accurate geometric model of real drawbeads that can be used for the automated design of drawbeads is presented in the paper. A three-dimensional geometric drawbead is a lofted surface, of which the section curves are constructed parallel to the stamping direction on the control points. Adaptive control point interpolation is introduced to simplify the management of the drawbead geometry and avoid unexpected shapes. Given primitive control points on a drawbead curve, dominant control points are adaptively obtained with the shapes of both the drawbead curve and the binder considered. An a priori heuristic parameter adjustment strategy is proposed to correct the parameter errors of section curves, which improves the accuracy and consistency of the drawbead geometry. By incorporating the proposed geometric drawbead with a previously developed intelligent drawbead optimization algorithm, a fully automated design process for drawbeads is realized that includes geometric modeling, finite element analysis, intelligent optimization of the drawbead geometry, and die manufacturing. Finally, a fender example is presented to verify the feasibility and validity of the fully automated drawbead design process. The simulation results with the optimized geometric drawbeads and equivalent drawbeads are compared with the experimental results. The proposed geometric drawbead shows remarkable practicability and accuracy in the automated design of drawbeads in sheet metal forming and demonstrates good consistency with the experimental results while the equivalent drawbead model introduces unneglectable deviations.     

Methods and tools supporting modular process design

Increasing competition in globalising markets requires effective means for development and production planning regarding innovative products. One efficient approach is an integrated product and process design, following the idea of concurrent engineering. Initialising process design at an early stage of product development allows for balancing the product characteristics and the process capabilities. In this connection, the architecture of process planning operations has to reflect the information certainty derived from the development process. At the Laboratory for Machine Tools and Production Engineering (WZL), methods and electronic data processing (EDP) tools for a continuous, product related process design in different planning and optimisation phases have been developed. The procedure and the efficiency of the developed methods and EDP-tools which are designed modularly are illustrated in the following paper.