定性立体建模中的领域比例伸缩操作

定性立体建模是研究和开发计算机辅助概念设计系统的重要内容之一。本文首先介绍了一种基于定性立体空间关系的定性立体形状表达和建模方法。随后着重介绍定位立体建模中领域的比例伸缩操作算法及其实现。该操作是实现定性立体模型修改的重要手段,其有效性通过实例得到说明。     

定性立体建模中的领域比例伸缩操作

定性立体建模是研究和开发计算机辅助概念设计系统的重要内容之一。本文首先介绍了一种基于定性立体空间关系物定性立体形状表达和建模方法。随后着重介绍定位立体建模中领域的比例伸缩操作算法及其实现。该操作是实现定性立体模型修改的重要手段,虎有效性通过实例得到说明。     

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。     

基于定性立体模型的产品可装配/拆卸性分析

探讨如何在尚未确定完整的定量信息的概念设计阶段实现计算机辅助设计产品可装配／拆卸性分析的问题，首先分析了概念设计的产品信息特点，提出定性装配模型的概念，该模型描述了零件间的壮配关系和零件的定性形状，然后提出一种可装配／拆卸性分析方法，该方法以定性的位置和形状为基本信息，通过分析零件的可移动性和移动方向，进行零件的装配／拆卸性分析。     

计算机辅助三维概念形状草绘设计研究进展

指出了计算机辅助三维概念形状草绘设计的定义及其应具备的几个功能;阐述了国内外该领域的研究现状;并对概念形状草绘设计中应用的多种三维建模技术进行了分析和比较;提出了制约三维概念设计草绘系统发展的主要因素及解决方法．     

基于继承的产品信息模型

本文在对概念设计过程信息建模研究的基础上,提出了一种基于继承的产品信息建模方法,它能很好地支持概念设计过程和设计修改的进行。     

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。     

加工中心自动换刀装置的虚拟设计

一、前言虚拟制造技术是基于计算机建模和仿真的设计、制造技术,它强调在实际投入原材料实现产品之前,将产品的设计、分析、测试、制造等过程在计算机构造的虚拟开发环境中进行数字化模拟。以设计为主的虚拟制造,是在产品开发设计中虚拟设计出产品,并解决产品在设计研制阶段的问题,即完成产品的概念设计、实体造型,并在虚拟出的产品上进行功能和产品工作性能的仿真,将其结果用于修改设计。虚拟制造的优越性在于可在开发设计阶段解决产品的各个问题,不需要制造出实体机器,节约了大量投资。在计算机上解决问题,制造过程变成信息的流…     

基于继承的产品信息模型

本文在对概念设计过程信息建模研究的基础上，提出了一继承的产品信息建模方法，它能很好地支持概念设计过程和设计修改的进行。     

基于多色集合理论的机械产品概念设计方法研究

介绍了多色集合理论，指出了多色集合为计算机辅助概念设计、信息建模技术及其相关的推理技术提供了强有力的工具，使机械产品概念设计这一难以形式化的设计过程有了建模的可能。给出了基于多色集合理论和功能方法树的机械产品概念设计的知识表达。建立了贴近度函数。给出一个关于方案功能相对需求功能冗余程度的教学模型，通过给定冗余允许值排除不合理方案。提出了基于多色集合理论的机构产品概念设计的设计步骤和实现流程图，为其它机械产品 的概念设计提供帮助。最后以机床设计为实例作了进一步的说明。     

Using a trope-based foundational ontology for bridging different areas of concern in ontology-driven conceptual modeling

In recent years, ontology-driven reference models have gained much attention in the literature due to their potential key role in activities such as complex information modeling and semantic interoperability. The engineering process of these conceptual models should account for different phases addressing different areas of concern. In an initial phase of conceptual domain modeling, the target modeling artifacts should be constructed with the goal of maximizing quality attributes such as expressivity and truthfulness to the represented domain in reality. In a subsequent development phase, the resulting domain models can be used to guide the design decisions in the construction of different implementation artifacts addressing different computational concerns. In this paper, we present a philosophically sound, cognitively-oriented and formally characterized foundational theory of objects and tropes (property-instances). Moreover, we use this theory to bring about engineering contributions to both the aforementioned phases of ontology-driven conceptual modeling. Firstly, we show how this theory has been used to (re)design a system of modeling primitives underlying the conceptual domain modeling language OntoUML. Furthermore, we provide precise directives on how to map conceptual domain models in this language to their implementation in less-expressive computationally-oriented codification languages. In particular, we address here a mapping strategy to OWL (Web Ontology Language) that partially preserves the modal-temporal semantics of OntoUML. Finally, we discuss computational support for the proposed approach in terms of conceptual model construction, automatic transformation and temporal querying.     

A preliminary study on qualitative and imprecise solid modelling for conceptual shape modelling

The shape design of products is the primary activity of design process. A preliminary study on qualitative and imprecise solid modelling for computer-aided conceptual shape design is presented in this paper. Firstly, the requirements of shape representation for computer-aided conceptual shape design are discussed. Secondly, in the situation where the product information is deficient, the ideas of qualitative and imprecise solid modelling are proposed to deal with qualitative and imprecise information of conceptual shapes. The aim is mainly to explore the representation and manipulation of product shapes in order to benefit designers to design shapes in the conceptual design phase. Finally, a prototype system called deficient information modelling system for conceptual shape (DIMShape) is under development to verify the relevant ideas.     

基于Petri网的机电产品功能分解单元模型研究

功能分析是概念设计过程中最重要的阶段,对现有机械产品概念设计理论及方法进行了分析,提出了基于Pe试网的机电一体化产品功能分解模型.对机电一体化产品概念设计中的功能分解过程进行分析,通过基本元素和动态行为机制的定义,建立产品功能分解单元模型.以喷墨打印机为例,建立了该产品的功能分解单元模型,验证了模型的可行性.     

基于特征模型和构件语义的概念体系结构设计

特定领域软件体系结构(domain-specific software architecture,简称DSSA)是特定领域开发中的重要资产,而基于特征的领域模型使得从领域需求到DSSA的映射成为可能.引入本体作为特征模型的描述基础,通过该方法得到的领域特征本体将同时作为领域内业务构件的语义描述基础存在.在此基础上,提出了基于特征模型和构件语义的概念体系结构设计方法.该方法综合考虑了特征模型中的共性、可变性、绑定时间以及结构关系、依赖关系等对DSSA设计的影响,同时以构件语义作为特征到概念构件设计的过渡.相关方法已经实现为基于本体的特征建模工具和基于特征模型的体系结构设计工具,为特征驱动的领域开发提供了有力的支持.     

计算机辅助概念设计研究

本文基于计算机辅助概念设计的重要性,首先介绍了产品设计的发展、相关软件CAD的开发与发展;以及产品设计的趋势,包括集成化、标准化、智能化和网络化等。接着又重点介绍计算机辅助概念设计的关键技术,主要包括产品信息建模和推理,从而说明计算机辅助概念设计具有重要的研究意义。     

Perspectives on hierarchical modeling in mechatronic design

Hierarchical modeling helps to describe product models and data from different viewpoints that, representing the different disciplines involved in the design process of mechatronic systems. This paper gives an overview of hierarchical modeling techniques. This includes the investigation of systems, which requires handling different issues that address very specific views of the system (system aspects) and come from various disciplines. Also the model granularity which describes the extent to which an object or model is broken down into smaller elements it an important aspect. The different phases of the product life cycle require models with different objectives and levels of detail. Some models are needed mainly in specific phases of the product life cycle, which are discussed in detail in the paper. Especially in the conceptual design phase some design-characteristic aspects such as hierarchy of parameters, modularity of the design should be analyzed, because in this phase the largest part of the later resulting product costs is predetermined or even fixed. As a consequence, the scope for design is limited to merely small changes in the subsequent design phases. Therefore the interaction between the design phases and the related models plays an important role the development process of mechatronic systems.     

概念设计产品功能信息模型的研究

概念设计阶段的的主要活动是围绕产品功能展开的,在总结现有的功能定义和功能表示方法的基础上,提出了以EXPRESS语言描述的概念设计产品功能信息模型,此模型具有广泛的适用性,可支持不同设计学派的概念设计活动,为计算机辅助概念设计系统的实现提供了信息模型基础。     

计算机辅助概念设计研究进展

以第4届国际计算机辅助工业设计与概念设计会议为背景，阐明了产品概念设计的内涵，指出计算机辅助概念设计CACD要解决的三大问题：概念设计方法学、产品信息模型及求解方法、计算机辅助概念设计技术；进而从智能概念设计技术、协同概念设计技术、虚拟概念设计技术、需求驱动概念设计技术等多个方面总结了CACD技术的研究进展，最后指出了CACD的发展趋势，并提出了CACD的三层架构．     

Transforming OntoUML into Alloy: towards conceptual model validation using a lightweight formal method

While conceptual modeling is strongly related to the final quality of the software product, conceptual modeling itself remains a challenging activity. In particular, modelers must ensure that conceptual models properly formalize their intended conceptualization of a domain. This paper proposes an approach to facilitate the validation process of conceptual models defined in OntoUML by transforming these models into specifications in the logic-based language Alloy and using its analyzer to generate instances of the model and assertion counter-examples. By allowing the observation of sequences of snapshots of model instances, the dynamics of object creation, classification, association and destruction are revealed. This confronts the modeler with the implications of modeling choices and allows them to uncover mistakes or gain confidence in the quality of conceptual models.