基于CATIA的三维参数化图形库建库工具设计与开发

基于ＣＡＴＩＡ 环境,面向三维模型,研制成功了一个参数化建库工具,并建立了尺寸驱动的参数化标准件库,用户维护、扩充方便,是同类图库建库的新方法。     

基于特征的通用三维参数化零件建库技术

研究三维参数化零件建库技术，系统介绍该技术支持下的一种建库一台，该平台基于商品化ＣＡＤ／ＣＡＭ软件，面向三维模型，库中零件为参数驱动的概念模式，可由系列化的尺寸参数动产生具体模型，提供开放而丰富的特征库与功能强大的特征库扩充接口，所提方法可通用于各种商品化ＣＡＤ／ＣＡＭ软件，并已在ＣＡＴＩＡ环境下实现，大大提高了设计效率。     

基于特征的通用三维参数化零件建库技术

研究三维参数化零件建库技术，系统介绍该技术支持下的一种建库平台。该平台基于商品化ＣＡＤ／ＣＡＭ软件，面向三维模型；库中零件为参数驱动的概念模式，可由系列化的尺寸参数驱动产生具体模型；提供开放而丰富的特征库与功能强大的特征库扩充接口；所提方法可通用于各种商品化ＣＡＤ／ＣＡＭ软件，并已在ＣＡＴＩＡ环境下实现，大大提高了设计效率     

标准件库及其管理系统

探讨了建立一种运行于ＡｕｔｏＣＡＤ２０００环境下的标准件库及管理系统的方法。即：利用ＡｕｔｏＣＡＤ２０００的最强有力的二次开发工具ＯｂｊｅｃｔＡＲＸ操作标准件描述文件。该系统还可以使用户创建自己的标准件库。     

电子图板应用讲座(八)

（续第４期）８图库与局部参数化设计８．１图库为了提高绘图效率，支持结构化设计，ＣＡＸＡ电子图板为用户提供了包括紧固件、支持件、传动件等多种标准件的参数化图库。用户可以按规定尺寸选用各类标准件和非标准件有机地结合在一起，有效地方便了设计绘图工作。电子图...     

基于关系的变量化图形支撑系统的标准件库的开发研究

在机械类ＣＡＤ中，标准件库的建立是一项十分重要的二次开发工作。本文系统地研究了在德国西门子－利多富公司的微机二维ＣＡＤ软件平台Ｓｉｇｒａｐｈ－Ｄｅｓｉｇｎ上建立标准件库的方案和方法。     

C语言与AutoCAD和FoxPro接口及其模具建库

本文介绍了Ｃ语言与ＡｕｔｏＣＡＤ和ＦｏｘＰｒｏ的连接方法，并对该方法运用于模具标准件建库进行了论述。用本方法建立的标准件程序具有使用方便、快捷、高效的特点。     

C 语言与 AutoCAD 和 FoxPro 接口及模具建库

本文介绍了Ｃ语言与ＡｕｔｏＣＡＤ和ＦｏｘＰｒｏ的连接方法，并对该方法运用于模具标准件建库进行了论述。用本方法建立的标准件程序具有使用方便、快捷、高效的特点。     

STRIM 100软件在冷冲模CAD／CAE／CAM上的应用

介绍了冷冲模ＣＡＤ／ＣＡＥ／ＣＡＭ工作流程，论述了采用ＳＴＲＩＭ１００软件进行模具表面几何造型的方法和刀具运动的轨迹的生成、编辑方法，以及冷冲模典型结构库、标准件库的建立方法和板料成形分析方法。     

机械CAD的可视化开发模型及支持环境

介绍ＣＡＤ应用软件的开发过程模型,基于该模型的支持库结构,特征或标准件的通用显示管理,以及用户界面管理系统。在过程模型支持下开发了特征可视化生成环境的实验系统。它是在软件界面和数据箱柔性制造系统思想的基础上扩充对约束及设计方法的可视化处理,以支持用户通过可视化方法生成特征、标准件及相关文档。     

A graphics environment for CIM applications

Programmers in graphics applications have come to expect a standard of pre-written software to provide the basic building blocks for their specific needs. Computer-aided engineering (CAE) now requires a similar standard of software to provide an integrated platform with higher levels of graphics functions, solid modelling facilities and user interfaces. PANACEA is a research tool which has provided this base for^oa number of CAE applications programs.     

基于 Z-MAP 结构的自由曲面三维实体色调图显示算法研究

随着计算机和数控加工技术的迅猛发展，数控加工的图形仿真技术目前已成为ＣＡＤ／ＣＡＭ领域内一个重要的研究课题，而其中加工零件的空间曲面的图形显示则更是关键技术之一。本文采用Ｚ－ＭＡＰ结构作为实体的表示方法，在以正等轴测投影原理作为显示变换算法的基础上，最终采用双三次Ｂ样条插值算法实现了空间自由扭曲曲面的三维实体色调图显示。其算法简便、运算速度快，非常适合于三轴数控加工中自由曲面图形仿真的显示运算。     

连杆类件的实体造型

介绍利用Cimatron∧it CAD/CAM软件作连杆实体造型的详细步骤。指出不同造型思路对安全连杆造型需要的步骤及难易的影响。对复杂实体的造型具有一定的指导。     

Supply chain workflow modelling using XML-formatted modular petri nets

This paper presents a modelling methodology of a workflow system of operations in a supply chain (SC) aimed to improve, from the traditional method, the consistency and integrity of the workflow data being exchanged amongst business partners. In this research, an XML-supported modular petri net-based modelling technique is adopted for the representation of the local and global workflow of "practitioners" in a SC. After constructing a petri net, the model of workflow systems can be constructed, understood and analysed more easily. A modular compositional modelling method is adopted to fulfill the particular functional requirements of a collaborative modelling of dispersed business partners in an up-to-date globalised SC environment. Finally, the use of a widely adopted XML schema for data representation and standard interface and interconnection mechanisms development in a workflow model can further improve the model's overall flexibility and integrity.     

平面凸轮的数控加工自动编程过程研究

针对平面凸轮的数控加工自动编程过程,主要介绍简单实体造型的绘制和编辑过程,运用CAXA2008软件平台,掌握简单实体造型加工方法的综合应用,通过一个完整的工作项目的完成,培养具备对简单实体造型自动编程和加工的能力。     

Boundary Element Method for Elasto-hydrodynamic Lubricated Multi-body Contact

In this paper, a formulation for isothermal Elasto-Hydrodynamic Lubricated (EHL) contact problems, using the Boundary Element Method (BEM) is proposed. The BEM is used for modelling both bodies in contact. The proposed formulation evaluates directly the film thickness considering the elastic deformation of the bodies after treating the problem as a coupled system (solid–fluid–solid). The fluid is modelled using the Finite Difference Method (FDM). The forward iterative method is used as the solution algorithm of the elasto-hydrodynamic problem. The analysis demonstrate that the BEM is efficient for modelling both solids in contact and that the computational time remains low.     

过程信息中的基因模型

提出了过程信息基因模型的概念，这是一种可重复使用的，标准化的，简化的，可使企业重组参考的，具有“生物型”特征的信息模型。其主要特点是继承性，封装性，转换性，相似性和自组织性。过程信息基因模型包括标准过程术语，基本过程模块和过程参考模型。提出了过程信息基因模型的分类，编码和建模的一般方法。     

How Crusader Solid Modelling Uses Simulation to Accelerate Design and Mitigate Development Risk

Crusader is the US Army’s next generation cannon artillery system; it is a two-vehicle system consisting of a tracked self-propelled howitzer and a tracked ammunition resupply vehicle. Currently in demonstration/validation with fielding scheduled for 2008, Crusader is the US Army’s highest-priority combat vehicle development program. The Crusader development approach relies heavily on modelling and simulation (M&S) to accomplish program development objectives. In particular, M&S is being employed to streamline development by accelerating design and integration while simultaneously mitigating technical, cost, and schedule risk. To achieve these goals, Team Crusader is implementing a system simulation development process that provides for early, evolutionary and iterative design and integration. The primary building blocks of this process are: 1. Support models, including static solid modelling, dynamic solid modelling, human factors modelling, object modelling, and M&S metrics. 2. Integration support models, including the dynamic object model and the visual prototype, as well as simulators, emulators, and stimulators (SES). A common simulation framework emplaced across the development team provides the development environment to ensure M&S compatibility and integrability.     

用仿铣齿法生成斜齿轮三维实体模型

介绍了在AutoCAD中用VBA编程造型三维实体模型和生成铣刀断面图的方法 ;阐述了模拟铣齿法造型斜齿圆柱齿轮的造型原理和算法 ,列出了其程序框图和主要程序     

Overcoming the influence of the coupling fluid in photopyroelectric measurements of solid samples

The thermal diffusivity of solid samples is systematically underestimated in a photopyroelectric technique used in the standard back configuration due to the presence of the coupling fluid between sample and detector. In this work, we propose a new method to overcome the undesired effect of the coupling fluid. It relies on the use of a transparent pyroelectric sensor and a transparent coupling fluid, together with a self-normalization procedure. In this way, we are able to measure accurately (a) the thermal diffusivity of opaque solid samples, and (b) the thermal diffusivity and the optical absorption coefficient of semitransparent solid samples.