计算机支持的工程设计概念模型

设计自动化技术已为工业界所广泛应用，并已从辅助设计过程的后期阶段向辅助概念设计阶段推进。在概念设计阶段实现设计自动化，其核心问题首先是建立计算机支持的产品概念模型。本文在研究概念设计模型的基础上，提出并探讨了一个计算机支持的模型结构及建模过程，最后采用Ｃ＋＋语言研制了一个原型。     

基于设计目录的计算机辅助概念设计系统

概念设计是设计中最重要的阶段之一,在概念设计阶段将完成从功能到功能原理解的映射过程,包含了设计中的大部分重要决策问题。在把用户需求转化为总功能后,要对总功能进行分解,直到不能分解为止,然后利用设计目录对子功能求解,获得相应的功能原理解,最后进行综合获得概念设计原理方案。本文在这个过程模型的基础上研究了面向计算机的概念设计模型、设计目录方法和概念设计过程模型,为计算机辅助概念设计提供了一套切实可行的方法。     

基于实例推理的产品概念设计模型研究

产品概念设计是设计过程中最具创造性的阶段。文中分析了产品概念设计过程的特点及其主要研究内容 ,介绍了基于实例推理的产品概念设计模型结构 ,对其关键技术进行了研究 ,提出了产品概念设计的实例表示、功能推理和方案评价模型。     

虚拟原型建模语言VPML

现有的模型描述语言难以满足基于虚拟原型的概念设计中产品模型描述的需求,基于扩充连接图思想,以基于虚拟原型的概念设计产品描述模型V－desModel为核心,提出了一种虚拟原型建模语言VPML,VPML是一种独立于领域与过程的面向机电产品概念设计的虚拟原型模型描述语言,具有较强的几何和行为建模能力,为多领域系统在概念设计阶段的协同设计、并行设计及联合仿真过程提供了一致的模型描述,VPML模型内嵌的虚拟特征生成算法,使得在概念设计阶段建立真实感很强的产品虚拟原型时设计信息不完备问题得到有效解决。     

机械产品概念设计中的知识表示

研究了计算机辅助概念设计中的关键技术——知识表示．将行为域引入公理化设计作为功能域和载体域之间的转换桥梁，针对该域结构定义扩展“之”字映射，建立了不同层次功能、行为和载体之间的映射关系；构造了概念设计方案的知识表示模型——域结构模板；针对一类产品的知识表示模型——概念空间，给出了基于概念空间的概念设计方案生成过程．最后以工业平缝机为例对所述模型和方法加以说明。     

基于Petri网的机电产品概念设计功能模型研究

功能分析是概念设计中最重要的阶段,从黑箱法的理论出发,以流及其状态和功能为基本要素建立了基于Petri网的机电一体化产品概念设计功能模型,为产品概念设计过程的优化以及设计效率的提高打下了良好基础,为以后智能软件的开发提供了良好的模型.     

基于结构模型的系统级测试性设计(DFT)技术研究

测试性是解决系统维护问题的有效手段,必须从产品的概念设计到实际设计过程的各个阶段并行地考虑.本文从结构模型出发,研究了系统级测试性设计的概念、理论和实现算法,并以动力调谐陀螺仪为例,进行了设计分析.结果表明,该方法可以有效地对系统级测试性问题作出设计决策,保证系统故障定位到功能单元.     

计算机辅助机械产品概念设计研究综述

产品设计是产品开发过程中最重要的环节之一,而概念设计又是产品设计中最关键的阶段之一。文中阐述了机械产品概念设计的研究目的、意义、特性和关键技术,在描述机械产品的信息分类的基础上,提出了一种概念设计模型。并从功能、行为、结构和形状等4个方面论述了计算机辅助概念设计国内外的研究概况,提出了实现计算机辅助概念形状设计对形状表达的要求,探讨了计算机辅助概念设计的发展方向。     

面向概念设计的草绘系统

产品概念设计是产品设计开发过程中最重要的阶段,在分析了概念设计阶段草绘方式重要性的基础上,介绍了两种不同的草绘模式,并提出了一个草绘系统实现的系统框架和设计过程,为设计者提供了一个自然流畅的设计空间。     

机构虚拟设计平台的研究与开发

以胶印机的机构设计为背景,提出了一个集成化的机构虚拟设计平台的体系结构,介绍了基于功能分解的机构概念设计,描述了构造装配模板实现概念模型与装配结构模型间的映射,并阐述了机构设计中的分析与评价等问题。     

NC Layout Design Based on Agent

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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.     

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.     

基于知识的设计过程保存与重构

提出基于知识的广义特征信息模型和记录设计历史的广义特征CSG树的表示方法.通过对设计知识与广义特征的封装,构建了广义特征信息模型,在该模型基础上用CSG树的方法表示了设计过程.广义特征信息模型和广义特征CSG树存储于XML格式的广义特征信息表中,实现了设计过程的保存.通过对广义特征信息表的导入和解析,重构了设计过程,实现了设计过程和设计知识的重用.最后给出了在涡轮叶片设计中的实例.     

Object-oriented design for manufacture

Economically effective and timely product manufacture requires that appropriate decisions are taken during the design of the product. Recent years have seen very considerable growth in the study and communication of knowledge in the area of design for manufacture (DFM). At the same time there have appeared many additional pressures on the design process: rapid changes in market requirements, evolution and revolution in product and process technologies, legislated strictures and liabilities, and quality and cost issues which must increasingly be addressed earlier in the course of product design. As a consequence there is a strongly perceived need to enhance design methods in order to address the many disparate aspects of design in an efficient manner. In this paper the DFM problem is addressed within this larger context. The approach described in the paper begins with the hypothesis that the concept of manufacturability can be established as one of a number of required attributes of a part which is to be designed and manufactured. An information model is then proposed which provides the potential to allow determination of manufactur-ability to be made in an ongoing fashion in parallel with other design activities. The nature of the information model is shown to be in harmony with object-oriented programming environments. Finally, the information model is used to illustrate the potential to embody the large body of DFM knowledge which is already in existence but which has yet to be systematically encoded.     

大规模定制下产品配置设计过程管理研究

产品配置是利用客户需求对配置模型进行实例化的过程．在这个过程中,需要对那些不能直接从已有零部件库中选配到的零部件进行新的设计．在研究产品配置设计工作流程和管理内容的基础上,针对需要设计的实例单元提出了一个产品配置设计过程模型,给出了配置设计过程中设计活动分解的三种结构、三个层次和两个模板,实现了配置中的实例单元数据和设计活动的集成．最后给出了模型在电梯产品配置设计过程中的实际应用．     

面向产品布局设计的组件特征模型

从特征角度看,产品设计可视为一个特征演化过程。然而就目前研究的内容来看,特征的范围基本局限于机械产品的零件级层次,难以支持外形、布局、人机工程占很大比重的通信、家电等电子机械产品的设计过程。针对上述不足,本文立足于特征的广义内涵,提出了基于产品级的组件特征概念及其相应的面向产品布局设计的组件特征模型。     

Simultaneous design and control of processes under uncertainty: A robust modelling approach

This paper presents a new methodology to integrate process design and control. The key idea in this method is to represent the system’s closed-loop nonlinear behaviour as a linear state space model complemented with uncertain model parameters. Then, robust control tools are applied to calculate bounds on the process stability, the process feasibility and the worst-case scenario. The new methodology was applied to the simultaneous design and control of a mixing tank process. The resulting design avoids the solution of computationally intensive dynamic optimizations since the integration of design and control problem is reduced to a nonlinear constrained optimization problem.     

A form verification system for the conceptual design of complex mechanical systems

This paper presents a summary of research into the development and implementation of a domain-independent, computer-based model for the conceptual design of complex mechanical systems [1]. The creation of such a design model includes the integration of four major concepts: (1) the use of a graphical display for visualizing the conceptual design attributes: (2) the proper representation of the complex data and diverse knowledge reguired to design the system; (3) the integration of quality design methods into the conceptual design: (4) the modeling of the conceptual design process as a mapping between functions and forms. Using the design of an automobile as a case study, a design environment was created which consisted of a distributed problem-solving paradigm and a parametric graphical display. The requirements of the design problem with respect to data representation and design processing were evaluated and a process model was specified. The resulting vehicle design system consists of a tight integration between a blackboard system and a parametric design system. The completed system allows a designer to view graphical representations of the candidate conceptual designs that the blackhoard system generates.     

An integral assembly model

Companies are increasingly being put under pressure from the market to design product and production better, faster, cheaper and more market-oriented. Insufficient coherence and synchronization between product, process and system design often lie at the basis of great design efforts and high design costs. This paper focuses on this subject, by introducing an integral assembly model to improve the insight into the interaction between product, process and system design. The objective of this model is to realize a controllable design process.