A feature-based approach towards an integrated product model in intelligent design

Conceptual design is an early stage in the product design process, which has an essential effect on the product innovation. Existing approaches for product knowledge engineering for conceptual design always focus on knowledge modelling and organization, etc. However, the traditional approach is lack of better comprehending representation and reuse of design knowledge in conceptual design. This paper is devoted to presenting a systematic effective integrated modelling approach of principle solutions in conceptual design to make the knowledge of functional design be transferred efficiently to the subsequent principle conceptual design and structure conceptual design process, and even detail design. With the introduction of the physical quantity model, feature-based representation model of function, effect, physical quantity, working principle and structure concept are put forward step by step, and then an integrated principle solution model is presented based on the generalized assembly model. The knowledge organization method of principle solutions based on physical quantities is also proposed. Conceptual design process based on integrated modelling and knowledge organization of principle solutions is presented, which discloses that physical quantity model is a bridge across functional design, principle conceptual design and structure conceptual design. The conceptual design of new devices for decreasing resistance of petroleum equipment offshore platform is given as an example, which demonstrates that the methodology is obviously helpful to increase opportunities for product innovation in conceptual design.     

原理方案设计模型及其在泵中的应用研究

对建立水泵原理方案设计模型的必要性进行了分析,在考虑现有设计方法模型的特点以及水泵原理设计自身规律的基础上,把逐步求精模型的闭环设计思想与面向对象设计模模型处融合,提出了一个原理方案设计模型。在本模型的功能分解中采用了ＦＢＳ方法。     

机电一体化系统概念设计过程模型的研究

主要研究了机电一体化系统的概念设计。通过对机电一体化系统的组成的新认识和它的概念设计特点的分析 ,提出了基于功能 行为 结构模型的机电一体化系统概念设计过程模型。它将有助于推动由思维模型向计算模型的转换 ,实现计算机辅助概念设计的目标。     

面向概念设计的产品信息建模

概念设计的主要任务是设计概念的产生和选择 ,它包含了设计中的大部分创造工作 ,是产品开发过程中最重要的环节之一。由于缺乏有效的产品信息表示方法 ,传统 CAD系统并不能对概念设计过程进行有效支持 ,然而对概念设计的计算机支持是 CAD系统发展的方向。本文在概念设计过程模型和面向对象思想的基础上 ,提出了一种面向概念设计的产品信息模型 ,为计算机辅助概念设计开辟了一条途径     

面向概念设计的产品信息建模

概念设计的主要任务是设计概念的产生和选择 ,它包含了设计中的大部分创造工作 ,是产品开发过程中最重要的环节之一。由于缺乏有效的产品信息表示方法 ,传统 CAD系统并不能对概念设计过程进行有效支持 ,然而对概念设计的计算机支持是 CAD系统发展的方向。本文在概念设计过程模型和面向对象思想的基础上 ,提出了一种面向概念设计的产品信息模型 ,为计算机辅助概念设计开辟了一条途径     

SAFE集成型概念设计过程模型

以系统化设计理论提供的概念设计过程为框架,将公理设计、功能基和效应集成,形成SAFE集成型概念设计过程模型,用于在概念设计阶段确定满足需求功能的原理解。该模型既适用于新产品的概念创新,也适用于已有产品的改进设计。快速切断阀的概念创新设计实例表明了上述模型的有效性。     

A process-oriented approach to modeling the conceptual design of aircraft assembly lines

The need to develop methods and software applications to support the design of assembly lines is academically and industrially acknowledged. This paper focuses on the conceptual design of aeronautical assembly lines. A model is proposed to represent the process to design an aerostructure assembly line at the conceptual design phase and the knowledge requirements to support such process. The conceptual design process is documented in an Integrated Definition for Function Modeling model and the knowledge model is documented in Unified Modeling Language. The model provides a starting point in the formalization of the assembly line conceptual design. The objective is to use such model for the development of a knowledge-based application prototype in an industrially used software system.     

泵CAD中的原理方案设计模型

在详细分析泵行业中ＣＡＤ状况的基础上,阐述了建立水泵原理方案设计模型的必要性。考虑现有的设计方法模型的特点以及水泵原理设计的自身规律,在面向对象设计模型的基础上事例了逐步求精模型的闭环设计思想,在功能分解中采用了Ｆｕｎｃｔｉｏｎ－Ｂｅｈａｖｉｏｒ－Ｓｔａｔｅ（ＦＢＳ）方法,提出了一个原理方案设计模型。并进一步将该模型应用于泵的原理方案设计的一实例中,得到了一个较为完整的水泵原理设计流程,表明此模型     

基于改进Freeman-Newell模型的机械产品概念设计过程研究

在引入行为信息的基础上,对Freeman－Newell模型进行了改进,建立了基于功能和行为的载体认知模型,描述了设计过程中单元求解过程;基于该载体认知模型构造了概念设计过程模型－概念空间;采用布尔矢量/矩阵对概念空间中设计元素之间的关系进行了描述,使之便于计算机的表达和操作,在此基础上,给出了概念设计过程的形式化描述。最后以工业平缝机为例对所述模型和方法进行了说明。     

广义机械系统概念设计模型与关键问题

研究了概念设计过程的发展，归纳出瀑布模型、原型模型和喷泉模型三种模型，并提出了平面螺纹模型。为便于计算机实现，提出了设计方案生成的空间螺旋模型。详细讨论了概念设计的设计要求、初始方案生成等 关键问题，强调设计要求分析要注意功能的条件性和主次性关系。与以往功能分解作功能匹配呈明显先后顺序，相互割裂不同，提出了功能分解与功能匹配是呈螺旋上升交替进行的观点。最后通过油田修井机系统设计实例，对广义机械系统概念设计的上述观点和模型做了进一步阐述和验证。     

产品概念设计重用研究

在对设计重用的基本理论进行研究的基础上 ,建立了能够记录概念设计历史的基于功能 -行为 -结构框架的概念设计信息模型 ,实现了功能、行为和结构的形式化表示 ,并通过与 PDM模型集成 ,建立了多粒度层次的概念设计重用框架 ,使 PDM系统成为概念设计重用的系统平台 ,同时还研究了概念设计重用信息的检索方法。     

基于语义关联与驱动的产品概念装配模型研究

面向概念设计的装配模型表示是机械产品装配建模技术研究的一个重要问题,现有的基于几何约束关系的CAD系统不能很好地解决这一问题。基于装配语义“三位一体”性给出了面向概念设计的产品装配模型表示方法,提出采用装配语义关联图表达零件之间的装配语义关系,通过装配语义关联图建立起支持概念装配模型的多层次语义关联和基于语义的装配驱动,从而实现机械产品从概念设计出发的自顶向下和从详细设计出发的自底向上的双向设计。     

CONCEPTUAL MODELING BASED ON LOGICAL EXPRESSION AND EVOLVEMENT

Aiming at the problem of abstract and polytype information modeling in product conceptual design, a method of conceptual modeling based on logical expression and evolvement is presented. Based on the logic expressions of the product conceptual design information, a function/logic/structure mapping model is set up. First, the function semantics is transformed into logical expressions through function/logic mapping. Second, the methods of logical evolvement are utilized to describe the function analysis, function/structure mapping and structure combination. Last, the logical structure scheme is transformed into geometrical sketch through logic/structure mapping. The conceptual design information and modeling process are described uniformly with logical methods in the model, and an effective method for computer aided conceptual design based on the model is implemented.     

计算机辅助模具概念设计系统的研究

概念设计是设计中最重要的阶段之一,由于概念设计在思维空间上表现得较为广泛和分散,需要有相应的理论、方法和工具作为设计支持,但传统的CAD系统不能对概念设计阶段进行有效地支持。本文以冲压模具结构设计为研究对象,将逻辑构件的形式化表示方法应用在模具概念设计中,具体探讨了模具构件及模具逻辑将配模型的表示方法,建立了计算机辅助模具概念设计支持环境,为模具概念设计提供了有效的支持工具。     

基于多代理技术的产品概念设计系统的实现

产品概念设计是产品设计开发过程中的最重要的阶段,在提出一个概念设计过程模型的基础上,采用分布式,分层多代理技术,提出了一种产品概念设计系统结构,并探讨了其实现的工作机理,从而为最终开发出产品概念设计的计算机软件支持工具打下良好的基础。     

基于功能基的产品概念设计模型研究

阐述了用于产品功能建模的功能基；描述了基本功能基的产品功能模型及元功能、功能对象等的表示方法；建立了元功能层、功能对象层、行为层和行为关系层的机械产品概念设计模型框架，能方便地进行产品概念设计。以实例设计对概念设计模型进行了说明。     

New evaluation methods for conceptual design selection using computational intelligence techniques

The conceptual design selection, which aims at choosing the best or most desirable design scheme among several candidates for the subsequent detailed design stage, oftentimes requires a set of tools to conduct design evaluation. Using computational intelligence techniques, such as fuzzy logic, neural network, genetic algorithm, and physical programming, several design evaluation methods are put forth in this paper to realize the conceptual design selection under different scenarios. Depending on whether an evaluation criterion can be quantified or not, the linear physical programming (LPP) model and the RAOGA-based fuzzy neural network (FNN) model can be utilized to evaluate design alternatives in conceptual design stage. Furthermore, on the basis of Vanegas and Labib’s work, a multi-level conceptual design evaluation model based on the new fuzzy weighted average (NFWA) and the fuzzy compromise decision-making method is developed to solve the design evaluation problem consisting of many hierarchical criteria. The effectiveness of the proposed methods is demonstrated via several illustrative examples.     

Computer-based Creativity Enhanced Conceptual Design Model for Non-routine Design of Mechanical Systems

Computer-based conceptual design for routine design has made great strides, yet non-routine design has not been given due attention, and it is still poorly automated. Considering that the function-behavior-structure（FBS） model is widely used for modeling the conceptual design process, a computer-based creativity enhanced conceptual design model（CECD） for non-routine design of mechanical systems is presented. In the model, the leaf functions in the FBS model are decomposed into and represented with fine-grain basic operation actions（BOA）, and the corresponding BOA set in the function domain is then constructed. Choosing building blocks from the database, and expressing their multiple functions with BOAs, the BOA set in the structure domain is formed. Through rule-based dynamic partition of the BOA set in the function domain, many variants of regenerated functional schemes are generated. For enhancing the capability to introduce new design variables into the conceptual design process, and dig out more innovative physical structure schemes, the indirect function-structure matching strategy based on reconstructing the combined structure schemes is adopted. By adjusting the tightness of the partition rules and the granularity of the divided BOA subsets, and making full use of the main function and secondary functions of each basic structure in the process of reconstructing of the physical structures, new design variables and variants are introduced into the physical structure scheme reconstructing process, and a great number of simpler physical structure schemes to accomplish the overall function organically are figured out. The creativity enhanced conceptual design model presented has a dominant capability in introducing new deign variables in function domain and digging out simpler physical structures to accomplish the overall function, therefore it can be utilized to solve non-routine conceptual design problem.     

基于数据挖掘的产品概念设计建模研究

在产品概念设计过程中，引入数据挖掘技术和方法，提出了基于数据挖掘的全息虚拟产品概念设计模型，开发了数据挖掘工具，建立了面向产品概念设计方案生成的数据仓库；研究建立决策树算法的数据挖掘模型，以支持度为目标，实现从所建立的机械产品库、设计规则库、领域知识库中挖掘相关数据、信息和知识，从而极大地支持机械产品方案创新设计过程。以机床传动机构设计为例，说明了采用决策树方法的数据挖掘模型来实现机械产品概念设计的功能结构映射过程。     

概念产品设计信息关系网的构造与表示

在产品概念解产生之后，应正确处理和表示设计过程中众多的设计信息。为此，建立了用于概念产品拓扑结构抽象表示的设计特征层次关系模型，提出了设计特征属性依存关系网模型。在这两个模型基础上，构造了用于表示概念产品设计信息的关系网。简要介绍了多色集合的主要思想，将概念解设计信息所包含的单元与多色集合的成分相对应，建立了概念产品设计信息基于多色集合的数学描述，以便于产品设计信息的存储、管理和随后设计工作的开展。