基于模型的工艺设计技术研究与展望

为了与设计部门协同开展工作,有效利用设计发放的三维模型进行工艺设计,本文针对传统二维工艺设计和基于模型的三维工艺设计过程进行了研究和分析。对不同方式的优缺点进行了对比。对工艺信息的产生过程展开分析。并进行了层级划分。针对基于模型的工艺路线规划、工序模型生成、工艺信息发布及管理等表明了观点。     

XTCAPP工艺数据管理系统在实际中的应用

介绍了XTCAPP工艺数据管理系统在工艺设计与工艺管理中的应用,以及XTCAPP在科研、生产管理中的拓展应用。通过实施XTCAPP系统,工艺设计和生产管理取得了很好的效果,大大提高了工艺管理水平。     

人工智能在计算机辅助工艺设计中的应用

随着计算机软硬件技术的不断成熟,计算机辅助工艺设计的理论与方法已发生了质的飞跃。将人工智能理论应用于计算机辅助工艺设计是新近发展起来的研究热点之一,也是工业设计现代化发展趋势。它不仅可以把人工智能领域中的研究成果移植到计算机辅助工艺设计中,而且也扩大了人工智能的应用领域,使两者得到完美结合,促进共同发展。本文简要地叙述了计算机辅助工艺设计和人工智能的基本概念,探讨了人工智能在计算机辅助工艺设计中的应用。     

基于案例推理的纺纱工艺智能设计

针对工艺设计系统在一定程度上依赖于专家知识和以往经验的特点,将基于案例推理引入到纺纱工艺设计中,提出了一套基于CBR的智能化工艺设计系统,介绍了工艺案例之间的相似性度量算法。并讨论了案例库（casebase）的维护。实际应用结果表明,该智能设计系统有效地提高了工艺设计的效率和准确性,缩短了产品开发周期,具有重要的应用价值。     

基于Creo的三维机加工工序模型构建方法研究

正基于三维模型的机加工工艺设计是当前制造领域研究的热点。本文在分析三维机加工工艺设计业务场景的基础上,结合Creo2.0软件平台,对三维机加工工序模型构建技术进行了研究。一、引言传统机加工工艺设计以工程图为设计数据输入,通过二维CAPP(Computer Aided Process Planning,计算机辅助工艺设计)系统完成工艺简图绘制及工艺设计,最后打印生成纸质工艺文件,与工程图一起在生产现场使用。工艺文件作为连接工艺规划和一线生产制造之间的信息载体,是一线工作人员的工作指导,具有十分重要的地位。     

浅谈化工工艺设计集成平台

根据化工工艺设计的特点,强调了工艺设计集成平台的重要性,详细阐述了化工工艺设计集成平台的系统结构和应有的主要功能,并根据系统结构和主要功能阐述化工工艺集成平台设计的方法和技术。     

基于案例的纺织工艺设计知识重用技术研究

纺织工艺设计是一个严重依赖于专家知识、经验的思维过程,完整准确的数学描述显得十分困难。该文研究了纺织工艺设计的知识表示与重用技术,提出了基于案例(CBR)的工艺设计智能化方法,提高了系统解决实际问题的能力。实践表明,CBR技术在纺织工艺设计中具有广阔的应用前景。     

CAPP领域构件复用技术研究

为了缩短工艺设计的时间,优化工艺设计过程,实现工艺设计的自动化,减轻设计员的工作强度,我国的很多企业都采用了CAPP构件复用技术,CAPP构件复用技术的应用,方便了企业对PDM,ERP等系统的应用,实现了企业对自身数据的统一化,实现了企业的工艺产品的标准化设计,实现了产品的现代化设计生产和管理。该文通过对有关资料的剖析和总结,明确了一些与计算机辅助工艺规划(CAPP)有关的概念,给出了CAPP构件复用技术研究方向和发展趋势。     

面向异地协同的工艺设计应用研究

在实施大型制造业企业的工艺管理系统时,通常会遇到企业的生产基地和研发中心分布在不同地域的问题,并且企业通常为了快速响应生产,会根据生产需要将不同的工艺设计室分放在不同的地区。但是很多工艺设计又需要不同工艺设计室的工艺人员共同来完成,这给工艺管理系统提出了一个异地协同设计的课题。为此,我们设计了一个跨区域的网络集成工艺管理系统,不仅可以将各地、各部门的工艺文     

未知工艺角下时序违反的机器学习预测

集成电路设计复杂性的增长以及工艺尺寸的持续缩减给静态时序分析以及设计周期带来了新的严峻挑战。为了提升静态时序分析效率、缩短设计周期,充分考虑FinFET工艺特性以及静态时序分析原理,提出了未知工艺角下时序违反的机器学习预测方法,实现了基于部分工艺角的时序特性来预测另外一部分工艺角的时序特性的目标。基于某工业设计进行实验,结果表明,提出的方法利用5个工艺角时序预测另外31个工艺角时序,可达到小于2 ps的平均绝对误差,远远优于传统方法所需的21个工艺角,显著改善了预测精度和减少了静态时序分析工作量。     

基于Petri 网的工业设计过程管理工作流建模研究

工业设计过程建模是产品设计过程管理研究的关键环节,直接影响着项目开发周 期和整体效益,但目前工业设计行业没有针对设计过程管理有效的建模技术及其系统。为实现 对工业设计企业设计过程动态性、结构性和有序性管理,在产品设计过程管理中引入面向过程 的组织管理与流程优化的工作流技术及Petri 网建模方法;然后根据对设计过程管理流程的研 究,构建了设计过程管理工作流程图;进而结合工作流技术、Petri 网过程建模方法和工业设计 过程管理流程提出工业设计过程管理的4 个阶段工作流建模方法：本体分析、元素提取、元素 概括、元素带入;最后,以工业设计过程管理建模领域为例构建了基于Petri 网的工业设计过程 管理工作流模型,在此基础上实现了工业设计过程管理原型系统。     

支持多学科设计优化的集成产品过程建模方法

针对当前主要的设计过程建模方法缺乏表达复杂产品多学科设计过程中资源的组织调用和协作方式等信息,提出一种支持复杂产品多学科设计优化的设计路线图框架过程建模方法.从全面表达设计过程信息的角度出发,描述产品多学科设计优化过程中的主要活动及其协同关系,建立支持多学科设计优化的过程模型;在此基础上,给出了多学科设计优化的过程规划方法,以降低产品设计过程中的迭代,通过构建支持多学科设计优化的集成产品设计过程结构框架,实现产品多学科设计优化的过程集成.最后通过已开发的多学科系统集成平台,应用具体设计实例验证了整套方法的有效性.     

Interactions between control and process design under economic model predictive control

Economic model predictive control (EMPC) is a model-based control scheme that integrates process control and economic optimization, which can potentially allow for time-varying operating policies to maximize economic performance. The manner in which an EMPC operates a process to optimize economics depends on the process dynamics, which are fixed by the process design. This raises the question of how process and EMPC designs interact. Works which have addressed process and control design interactions for steady-state operation have sought to simultaneously develop process designs and control law parameters to find the most profitable way to operate a process that is able to prevent process constraints from being violated and to optimize capital costs in the presence of disturbances. Because EMPC has the potential to operate a process in a transient fashion, this work first focuses on how EMPC and process design interact in the absence of disturbances. Using small-scale process examples, we seek to understand the fundamental nature of the interactions between EMPC and process design, including how these interactions can impact computational complexity of the controller and the design procedure. We subsequently utilize the insights gained to suggest controller design variables which might be considered as decision variables for a simultaneous process and control design problem when disturbances are considered.     

Supporting process design for e-business via an integrated process repository

Business process design is an integral part of e-business engineering. Given that e-business models usually involve a wide range of business processes across different business functions with complex activities, events, and documents, process design for e-business is a very challenging task. Although various process reference models (PRMs) have been developed to provide guidelines for process design, research on leveraging multiple PRMs to support process design for e-business has been scant. In this paper, we demonstrate that the diverse process design requirements in e-business are best satisfied by utilizing multiple PRMs via a case study. Then, we propose a collaborative approach grounded in knowledge management theory to integrating multiple process reference models to better support process design in e-business. We equip the integrated process repository with a set of novel features based on Web 2.0 technologies to enhance its utility, efficiency, and quality for process design support. A prototype system is developed and user experiments are conducted to evaluate the system.     

流程工厂设计软件的关键技术研究及展望

首先分析了流程工厂所涉及的专业领域以及设计过程的特点,从而推导出 目前流程工厂设计软件需要的主要关键技术和功能要求。从流程工厂设计软件的图形平台的 相关技术、协同设计技术及要求、以及如何支持流程工厂全生命周期的管理3 个方面探讨了 流程工厂软件需要的主要技术和功能。然后分析了国内外主流流程工厂设计软件的发展水平 和采用的技术,并提出了国产流程工厂设计软件和国外流程工厂设计软件的差距。最后对国 产流程工厂设计软件的发展做了展望和具体的期望。     

基于协作的协同设计过程控制对象知识建模技术

在分析协同设计领域问题的协作求解模式基础上，分析了协同设计领域问题求解的过程控制对象，提出了协同设计领域问题求解过程控制对象的多层次协作求解机制。并以领域问题协作求解、业务处理的过程控制以及领域控制知识的处理过程为核心，构建基干协作的协同设计过程控制对象的知识处理模型。最后以活动框架的业务处理过程控制为背景，讨论了协同设计领域问题求解过程控制对象的知识处理算法及其程序实现过程。     

Process optimal design in non-isothermal backward extrusion of a titanium alloy by the finite element method

A new approach to process optimal design in non-isothermal, non-steady metal forming is presented. In this approach, an optimal design problem is formulated on the basis of an integrated thermo-mechanical finite element process model so as to treat diverse process parameters, either thermal or mechanical, as the design variables to be optimized, and a derivative based approach is adopted for conducting optimization. Described in detail are the integrated process model, a formulation for process optimal design, and the schemes for the evaluation of design sensitivity, in particular, a scheme for reflecting the effect of remeshing on design sensitivity. The validity of the schemes for the evaluation of design sensitivity is examined by performing a numerical test. Also examined is the integrated process model regarding its capability of predicting defect formation, through comparison with experimental observations. Then, the proposed optimal design technique is applied to process optimization in non-isothermal backward extrusion of a titanium alloy, with emphasis on preventing defect formation.     

Application of entity-based approach for unified representation of design alternatives for structural design

To support the design process fully from preliminary to detailed design stages in a natural way, a computer-integrated design system is needed. In early design stages more than one design alternatives are considered as possible solutions. The representation of design alternatives must be uniform and unbiased to be equally treated. In this study, an entity-based approach has been adopted to develop product and process models for representing design alternatives, which is more desirable for top–down design process because it allows high-level abstraction in representing design information and design activities. The entity-based approach has several benefits: (1) a unified representation of design alternatives; (2) a consistent development of product and process models based on the entity-based concepts; and (3) an easy integration of the product and process models. The work toward product and process models for structural design presented in this paper is a useful step toward integrated computer-aided design systems.     

Knowledge representation and reasoning in the design of compositesystems

The design process that spans the gap between the requirements acquisition process and the implementation process, in which the basic architecture of a system is defined, and functions are allocated to software, hardware, and human agents. is studied. The authors call this process composite system design. The goal is an interactive model of composite system design incorporating deficiency-driven design, formal analysis, incremental design and rationalization, and design reuse. They discuss knowledge representations and reasoning techniques that support these goals for the product (composite system) that they are designing, and for the design process. To evaluate the model, the authors report on its use to reconstruct the design of two existing composite systems rationally     

How novices design business processes

Process modeling is an important design practice in organizational improvement projects. In this paper, we examine the design of business process diagrams in contexts where novice analysts only have basic design tools such as paper and pencils available, and little to no understanding of formalized modeling approaches. Based on a quasi-experimental study with 89 BPM students, we identify five distinct process design archetypes ranging from textual to hybrid and graphical representation forms. We examine the quality of the designs and identify which representation formats enable an analyst to articulate business rules, states, events, activities, temporal and geospatial information in a process model. We found that the quality of the process designs decreases with the increased use of graphics and that hybrid designs featuring appropriate text labels and abstract graphical forms appear well-suited to describe business processes. We further examine how process design preferences predict formalized process modeling ability. Our research has implications for practical process design work in industry as well as for academic curricula on process design.