基于Agent的产品并行开发过程管理系统

提出一种基于Ａｇｅｎｔ的产品并行开发过程管理系统,分析系统的结构,阐述主要Ａｇｅｎｔ的功能和工作原理,并说明Ａｇｅｎｔ的构造和系统实现方法。基于Ａｇｅｎｔ的产品并行开发过程管理系统具有结构灵活,适应性强等特点,为产品并行开发过程提供了有力的支持工具。     

产品可制造性逐步评价方法

提出一种面向并行工程的产品可制造性逐步评价方法,其评价对象可以是产品详细设计阶段的不完整的特征模型,因而可在设计过程中的任一时刻进行可制造性评价。为了保证评价方法的连贯性和评价速度,仅对前一次评价之后可能产生新的可制造性问题的特征进行评价。对产品设计过程中的特征的改变状态进行了研究,提出在产品设计过程中确定特征之间可制造性影响关系的方法,并通过影响关系找出确需进行评价的特征集合,然后采用基于规则的方法来评价特征的可制造性。     

回转类零件CAD／CAM并行设计的建模技术

介绍了基于并行设计理论实现ＣＡＤ／ＣＡＭ集成的回转类零件并行设计ＤＰＭ－Ｔ的体系结构和零件全局数据模型和系统控制模型的建立，讨论了ＤＭ特征分类，表达 零件可制造性评价等问题。     

回转类零件 CAD/CAM 并行设计的建模技术

介绍了基于并行设计理论实现ＣＡＤ／ＣＡＭ集成的回转类零件并行设计系统ＤＰＭ－Ｔ的体系结构和零件全局数据模型和系统控制模型的建立。讨论了ＤＭ特征分类，表达方法和零件可制造性评价等问题。     

面向CAD／CAPP并行设计的特征模型

特征建模是实现并行工程（ＣＥ）及ＣＡＤ／ＣＡＰＰ／ＣＡＭ信息集成的关键。针对ＣＡＤ／ＣＡＰＰ并行设计的要求,从集成的角度提出了一个基于特征的产品模型,开发了一个面向制造的特征库,通过特征的构建完整的产品信息,包括设计阶段构造的零件总体信息、特征信息与加工工艺性信息等。通过统一的产品模型为下游的可制造性分析、工艺性规划等提供了有力的保障。     

并行工程在产品开发中的应用：第二讲 体系结构和关键技术

一、产品并行设计体系结构 图1是产品并行设计体系结构图,其中,产品信息模型是本系统的核心和基础。在产品并行设计过程中,按四个阶段进行设计和评价。 1.产品概念设计及其评价 对产品设计要求进行分级描述和表达,如设计实体的类型、性质、属性、实体之间的关系描述和设计约束的描述等,并基于产品功能进行概念设计。其主要内容包括方案优选、产品批量、类型、可制造性和可装配性评价等,并利用各种知识对方     

产品并行设计的特征信息生成方法研究

产品特征信息模型是并行设计的基础。本文系统分析产品特征信息在产品生命周期中的作用，详细研究产品特征信息生成的有关方法与技术，说明了特征识别与特征变换技术在集成ＣＡＤ／ＣＡＭ并行设计中的重要作用。     

产品可制造性评价方法研究

在分析产品可制造性评价内容的基础上,结合产品并行设计过程特点及工程实际,主要针对产品可制造性的可加工性,建立了基于制造约束规则的加工可行性定性评价和基于模糊综合评判的加工可行性定量评价两种评价方法,最后以航空发动机叶片为应用实例,说明该方法的有效性和实用性,从而在产品设计过程的早期就考虑制造的因素,指导产品设计,缩短产品开发周期,提高产品质量。     

面向并行CAD/CAM集成的特征建模技术的研究

介绍了一个支持并行ＣＡＤ／ＣＡＭ集成的特征造型的原型系统。它的主要特点是：支持多视域性特征建模；使用改进的增量特征识别的方法，将设计特征和制造特征相互关联，并提供有效的转换和维护手段。     

分布式多Agent诊断系统研究

建造了面向制造过程监控的分布式多Ａｇｅｎｔ诊断系统结构。着重对多Ａｇｅｎｔ系统的模糊关联模型进行了研究，建立了Ａｇｅｎｔ工作状态的表达机制，确定了Ａｇｅｎｔ间的工作状态影响关系，并构建了多Ａｇｅｎｔ模糊关联矩阵。最后基于多Ａｇｅｎｔ模糊关联模型，研究了多Ａｇｅｎｔ系统的模糊关系诊断与决策问题。     

A manufacturability advisor for spun and rollformed sheet metal components

In today’s manufacturing scenario, accounting for manufacturability considerations at the product design stage is not an option but a necessity. When CAD/CAM tools are used to reduce design lead times, accounting for manufacturing process related considerations implicitly is often difficult. Availability of manufacturability advisor systems that analyze part geometry and other product related information for ease of manufacturing could be a solution to this problem. The purpose of a manufacturability assessment is to give feedback to the designer in order to make the product/process more effective. Present research is concerned with the development of an automated manufacturability advisor for sheet metal components. Unlike most of the work done in the past that concentrated on bending and other forming processes, present work deals with sheet metal components manufactured by two different processes, namely “spinning” and “rollforming”. Effectiveness of the proposed manufacturability advisor is demonstrated by taking the number of industrial parts as examples.     

A concurrent manufacturing strategy for One-of-a-Kind Products with complicated sculptured surfaces

In this paper, we propose a computer-aided system for concurrently designing and manufacturing a customised or One-of-Kind Production (OKP) mould or die which has complicated sculptured surfaces. Considering the OKP production characteristics of high customisation and concurrent product development and production, we believe that the concurrent consideration of both the design and the manufacturability of a mould or a die would be necessary. This concurrence can be realised by providing timely manufacturability information feedback after a design is completed or a feature is modified or added in the design. The other problem is that the sculptured surface geometry model of a mould or a die does not contain any machining information. Hence we developed an intermediate data model for capturing manufacturing features when we are modelling the geometric form of a mould or a die. The system is based on CADDS5 which is a commercial CAD/CAM system. Two modules for data extraction, coverting and modelling as well as for manufacturability analysis have been developed and added to CADDS5. Using this computer-aided system; a designer can interrogate geometry and machining constraint information through a user friendly interface to avoid defects and inefficiency resulting from an earlier design, and can finalise the design by making quick incremental adjustments. The system has been implemented in a mould and die manufacturing company in China. This implementation leads to less rework and shorter lead time.     

Detecting re-design area for increasing manufacturability of drilling and three-axis pocketing operations

The intensive competition has forced the manufacturing industry to improve product quality and production efficiency, and meanwhile reduce production cost. Detecting potential manufacturability problems in early design stages would prevent unnecessary cost involved in re-work and/or re-design activities at later manufacturing stages. This paper presents an algorithm for determining re-design areas to feedback the designer when the design model involves machining holes and pockets using a three-axis computer numerical control machine. The algorithm takes into account the various sizes of tools and tool holders, and therefore allows a designer to test the manufacturability of their available cutters on their design models. A color-based obstacle-detecting method, based on layer-slicing of re-design areas, helps a designer to re-evaluate a design model for increasing manufacturability. Practical examples are provided as the output of the process.     

Developing an integrated framework for feature-based early manufacturing cost estimation

The major objective of concurrent engineering is to consider the related downstream manufacturing during the design stage. Estimating manufacturing cost during the early design stage is one area that has been given little attention by researchers. However, if the product manufacturing cost can be estimated during the design stage, designers can modify a design to achieve proper performance as well as a reasonable cost at an early stage of the product development process.Basically, manufacturing cost is determined by shape complexity, product precision and tooling process. That is, if these data can be obtained and considered during the design stage, estimating manufacturing cost during the early product development stage will become a feasible task.In this research, a framework for estimating the manufacturing cost in terms of a feature-based approach is proposed. This system tends to estimate the manufacturing cost of a design according to the shapes and precision of its features. The objective of this research is to provide a tool to assist a designer, who has little knowledge about the manufacturing process, to estimate the fabrication cost of a design during its conceptual stage, in order to reduce unnecessary costs in the downstream process.     

面向敏捷制造的可制造性评价和合作伙伴选择研究

根据敏捷制造环境下可制造性评价和合作伙伴选择的内在联系，提出了一种面向敏捷制造的可制造性评价和合作伙伴并行选择方法，该方法将可制造性评价和合作伙伴选择集成起来，使产品开发组根据合作伙伴的制造能力来评价设计的可制造性，并由产品开发组来选择最佳合作伙伴，优化设计的同时也改善了与合作伙伴之间的合作关系。     

A knowledge-based manufacturing and cost evaluation system for product design/re-design

Various research studies have concluded that most new design projects are actually re-design activities. This re-design may be for improvement or for reprovision of existing products. Most research efforts for providing computer tools for supporting conceptual or early design mainly concentrated on the design of new products. In practice manufacturing plans generated when an order was placed may quickly become out-dated as the manufacturing environment and constraints often change. It is therefore equally important to regenerate manufacturing plans and re-evaluate design every time a product is changed, re-designed or reordered. This project focuses on manufacturability analysis and provides re-design support for conceptual design of discrete single-piece mechanical parts with emphasis on machined processes. This limitation of implementing the prototype system for re-design activities is not a system design or methodology restriction. The condition has been imposed by the authors as a prelude to validating the system and its results. A novel hybrid approach using a combination of sequential flowchart logic and an expert system has been developed which uses a user-defined feature tree as the input for its analysis. The system allows the designer to estimate manufacturability according to criteria of time and cost, and also to explore different scenarios of parametric variation in the design. A case study has been presented to validate the system’s practicality and usefulness.     

基于企业资源的设计重用研究

在中国国家“十五”科技攻关重大项目《沈阳市用高新技术改造传统装备制造业示范工程》支持下，研发大型成套装备产品设计开发支持系统技术，解决产品设计开发方法问题，报告基于企业资源的设计重用研究成果。 通过对当前中国大陆机械制造企业产品开发设计现状的分析，基于产品并行和协同设计理论，提出设计关系模型，以体现产品设计的并行、协同、面向全生命周期等属性；突出设计师对设计过程的触发和参与——在从概念设计到详细设计的过程中，设计师应能简捷有效地在一定层位对设计进行修改。 借助产品创新设计原理、方法及合理化工程等理论，分析产品开发与建模过程。以最大限度实现并行工程与协同工作环境的设计重用，提出基于并行工程的机械产品创新设计平台PDM概念。平台PDM由基础环境层、应用支持层、应用工具层及应用界面层组成。提出产品设计过程及产品结构物理模型，基于实例与特征技术、产品结构与PDM映射，建立数学模型、映射模型及实例模型，明确设计过程关系，使PDM系统成为实现概念设计重用的系统。     

并行工程下CAPP工艺决策加工元模型研究

提出了面向并行工程下产品设计的ＣＡＰＰ工艺决策加工元模型,并讨论了基于该模型的零件加工工艺性分析问题。应用该模型、可以将工艺决策与产品设计有机结合且符合工艺设计分阶段、分层次,从局部到全局,从主要到次要的渐进循环规律。     

并行工程下的面向制造的设计

结合并行工程的思想,对面向制造的设计进行了较详细的分析,指出面向制造的设计与并行工程的关系,提出了并行工程环境下面向制造的设计技术中存在的问题及对策,全面合理地对零件的面向制造的设计进行了评价,从而指导产品设计。     

二维图形的特征分析与特征建模

基于特征的设计方法在三维零件设计中及面向制造的设计过程中得到广泛应用，但是由于二维图形在机械零件设计中的地位，决定了二维图形依然是设计师的表达语言。本文就针对基于零件的二维特征的参数化设计进行了深入的研究，提出了一种基于二维特征的参数化设计的特征分析和特征建模方法，该方法对实现基于二维特征的参数化设计具有重要的意义。