基于Autodesk Inventor创建的企业标准件库

Autodesk Inventor是一款很有特色的基于参数化、变量化特征建模的三维设计软件,可以在装配中或者基于装配关系进行零部件的关联设计.     

基于Autodesk Inventor创建的企业标准件库

Autodesk Inventor是一款很有特色的基于参数化、变量化特征建模的三维设计软件,可以在装配中或者基于装配关系进行零部件的关联设计.……     

基于NX/Open的企业零部件库参数化建模方法①

企业产品三维模型数据库的构建,是实现大规模定制设计和快速响应设计的基础。为了满足快速构建企业产品资源库的需求,提出了一种基于三维设计平台的企业零部件库参数化建模方法。该方法以三维设计软件UG NX为开发平台,基于NX/Open开发产品三维零部件库。基于层次性参数化建模方法,提出利用主模型技术和自顶向下的方法实现产品的参数化建模及变型设计,实现了零部件和装配体的参数化建模。结合数控机床快速响应设计系统中刀具库设计开发的实例,给出企业零部件库的建库流程,表明基于主模型的层次性参数化建库方法是企业产品资源库建立     

三维参数化零部件库建模方法研究

基于参数化建模技术构建企业产品数据库,是实现大规模定制设计和快速响应设计的基础。以UG软件为开发平台,分析软件提供的多种标准件建库方法,给出了基于UG零部件库二次开发的基本流程,提出基于UG的层次性参数化建模方法,利用主模型和自顶向下的方法实现零部件的参数化建模,并给出了其实现方法。结合数控机床快速响应设计系统中刀具库设计开发的工作流程,给出了刀具库的应用开发实例。     

嵌入式典型零部件快速设计系统

研究运行于多种三维CAD平台下的嵌入式典型零部件设计系统的组件体系结构，提出基于用户自定义特征的典型零部件数据库设计和模板生成方法，开发了常用的7大类典型零部件设计与校核工具包，实现了CAD平台下典型零部件的模板生成与参数化重构、设计过程导航以及零部件之间基于坐标系的自动装配．最后给出Pro／Engineer2001下嵌入式典型零部件设计系统的运行实例，验证了该系统实现典型零部件从设计到三维造型乃至自动装配过程的一体化、快速化与智能化．     

基于Web服务的零部件参数化设计重用

在分析产品零部件设计重用过程的基础上,借鉴软件重用中组件模型的可重用服务及接口与实现过程相分离等思想,给出一个基于Web服务的零部件参数设计重用框架。该框架由上至下分别为设计接口层、设计服务层、设计结果层。在服务端通过软件集成技术(如iSIGHT等)实现零部件设计过程自动化、参数化及集成化,建立零部件的参数化设计模板。利用Web封装技术(如EASA软件)对参数化设计模板封装、管理,从而实现客户端基于Web服务的零部件参数化设计重用。实例验证表明,通过该方法实现的零部件重用在保证零部件设计质量前提下可有效地提高效率。     

农业机械典型部件装配关联设计

利用Autodesk Inventor对农业机械典型部件进行参数化特征造型和基于装配的关联设计，探讨典型部件三维建模技术要点和基于装配的关联设计技术关键，并动态模拟装配过程和关联产生二维工程图，在制造之前向客户展示其虚拟样机，提高了农业机械改型设计和系列化设计的效率，确保了较高的设计精度和工作性能．     

基于Inventor API的家具三维造型设计

国内外家具业趋向于设计出不同系列风格的家具,同时又要求提高设计效率.为了能够满足这方面的需要,通过研究Inventor API的功能,关联Inventor与数据库Excel,运用Inventor的二次开发工具Autodesk Inventor Wizards,基于VB.NET实现了对话框界面的通讯机制,即实现人机交互界面以达到程序自动建模的功效.从已有的家具模版中自动地生成新的家具,并能够替换整体家具的零部件,大大地提高了设计效率,实现并给出了程序示例.快速、自动地新建家具模型的结果表明,基于Inventor API的技术在家具三维造型设计二次开发中具有重要的意义.     

基于事物特性表的除氧器参数化设计系统

提出了一种基于事物特性表的除氧器参数化设计方法,这种方法是以数据库和模型库为支撑,实现除氧器的智能参数化设计。事物特性表描述了除氧器总体、零部件、标准件等所有参数和属性,组成了一个庞大的专家系统。经验丰富的工程师总结出计算、选型、设计等方法,再加上企业规范组成推理机,通过VB6.0使推理机成为用户操作的计算机对象,实现了从参数计算到结构设计、工艺设计、以及最终生成并完善二维CAD图纸的功能。     

参数化特征造型中拓扑结构变异的一种解决方法

文中首先分析了基于边界表示的特征模型用于参数化特征变动设计所存在的问题,指出了以边界表示中的几何边为形状特征定位约束基准无法满足拓拟结构变异的局限性,分析了基于草图的特征造型方法在变动设计中的重要性。在此基础上,提出了将基于实体模型边界表示的特征模型与基于草图的特征模型结合起来的新思想,并给出了该思想的实现方法,该方法使特征定位基准在特征造型过程中保持不变,且不随特征定位约束参数的改变而变化,能很好地满足参数化变动设计与拓扑结构变异的要求。     

基于Inventor的三维参数化部件库系统的开发方法

介绍了基于AutodeskInventor的部件库的体系结构和实现方法。把部件库系统分为零件库和部件库两层结构,通过部件模型确定组成部件的组成零件及其装配关系,通过数据表和程序确定零件的规格。此方法解决了常用三维CAD软件不直接支持装配件参数驱动的问题,使得基于三维CAD软件创建部件库系统成为可能。文中所述部件库系统是使用VC++对Inventor进行二次开发而得到的。同时,该方法也适用于其他常用三维CAD软件。     

利用关联关系的标准件参数化设计方法

分析了产品几何建模的参数化设计方法,提出了一种基于关联关系的标准件参数化设计方法。阐述了参数化设计方法的原理,即采用关联参数建立多个组件间的关联,以实现标准件的参数化设计。利用CATIA平台,给出了圆锥滚子轴承基于关联关系的参数化设计过程,证明了该设计方法的可行性。     

面向组件的分布式零件优化设计和数据管理系统

采用分布式三层网络模型,构建了分布式的基于UG外部开发的零件参数化设计组件及基于Fortran语言的优化设计组件．利用VC 6．0和UG二次开发接口,以面向组件的系统开发方法和COM／DCOM编程方式进行了组件拼装,开发了一套集零件数据管理、参数化设计、优化设计和有限元分析等功能于一体的分布式零件优化设计与数据管理系统(D3MS)．     

基于Open Inventor的可视化三维激光光路布局设计和传输仿真

为解决传统二维光路设计和传输仿真中三维可视化不足的问题,通过增强光路设计的三维交互能力,提出基于Open Inventor的可视化三维激光光路布局设计和传输仿真. 借助Pro/ENGINEER完成光学元件和光路模型的建模,以Open Inventor为三维可视化仿真开发平台进行光学元件和光路模型及模型定位功能的管理,实现光学元件和光路模型的三维可视化布局,建立传输仿真场景数据库,并采用基于粒子的方法仿真激光传输过程. 初步应用表明,可根据设计要求对光路中的光学元件进行布局,调整光路模型,直观展示光路走向,对光路传输路线进行可视化仿真.     

基于参数化零部件的自动装配设计

介绍在参数化零部件库的基础上实施装配设计的参数化。在设计者对装配尺寸或零部件的参数作出个性后,可自动进行装配图调整,达到零部件参数化和装配设计参数化的统一,实现自动设计。     

Automated sizing of automotive steering ball joints in parametric CAD environment using expert knowledge and feature-based computer-assisted 3D modelling

Ball joints used in the steering systems of vehicles are exposed to fluctuating loads, which can cause fatal accidents in case of failure. The design of ball joints is an iterative and time-consuming process. Even though the automotive industry is preparing for the era of autonomous self-steering vehicles, parts such as ball joints were not designed using a fully automated parametric design methodology. Recently, parametric design of automotive ball joints based on variable design methodology using knowledge and feature-based computer-assisted-3D modelling methods was studied. However, these studies do not give details of the interactive sizing process within the part and assembly module to determine the final dimensions for avoidance of fatigue failure.This work provides methods and discusses details of the configurable sizing of a ball joint assembly under the boundaries of the developed “parametric design platform”. The platform closes the software gap for the automated reconfiguration and sizing of the ball joint assembly using a three-dimensional (3D) modelling technique. The platform can parametrically change part, material, feature, geometry, assembly and dimension features in a programmable environment. It can also reconfigure the ball joint assembly model considering various structured data conforming to technical standards and reasoning mechanisms with “engineering and geometrical relations” provided in this work, and data gathering along the life cycle of a product. Parameterised 3D solid models and a knowledge base of ball joints are stored in a database, and then an evaluation process within the platform that is capable of sizing ball joints for infinite fatigue-life has been established to verify sizing. It demonstrates the practicability and validity of the automated sizing of a steering ball joint within a configurable design environment and with minimum human expert knowledge and interaction.     

A feature-based fixture design methodology for the manufacturing of aircraft structural parts

In fixture design for the manufacturing of aircraft structural parts, there are various challenges and serious problems in industry, such as difficulty in design knowledge capture and reuse, and the arbitrary or non-standard nature of design, which influence the efficiency and quality of fixture design. This paper proposes a feature-based fixture design methodology in which previous fixture design cases and design rules are described in association with features and thus the design knowledge is integrated with geometric information of aircraft structural parts, which are the main concern of this project. In this methodology, machining features of the structural parts and their associated attributes are identified by feature recognition technique from the 3 dimensional (3D) part models defined based on model-based definition (MBD) technique. The feature-based part information models are then established and are used to retrieve previous fixture design cases and design rules stored in the knowledge base. Fixture designers will choose the appropriate retrieved design cases as the starting point for new fixture design or use previous designs to assess his/her current design. In this way the process of new fixture design can be improved. In the current stage of the research, a prototype feature-based fixture design system based on CATIA for the manufacturing of aircraft structural parts has been developed and used by a large airplane manufacturer.     

分层异构控制软件的构件化建模和设计

在分离控制软件计算功能成分与交互行为成分的基础上,提出了一种异构控制软件构件化建模设计方法。采用层次化思想实现软件构架,管理异构控制模型,实现构件与设计模式复用。引入“管理器”的概念来描述构架如何将一组原子构件的计算成分集成为支持异构模型的复合构件。在分布式实时平台上通过实现简化的构件化分层异构控制软件验证该方法的可行性。     

Feature-based design for heterogeneous objects

Heterogeneous objects are objects composed of different constituent materials. In these objects, multiple desirable properties from different constituent materials can be synthesized into one part. In order to obtain mass applications of such heterogeneous objects, efficient and effective design methodologies for heterogeneous objects are crucial.In this paper, we present a feature based design methodology to facilitate heterogeneous object design. Under this methodology, designers design heterogeneous objects using high-level design components that have engineering significance. These high level components are form features and material features. In this paper, we first examine the relationships between form features and material features in heterogeneous objects. We then propose three synthesized material features in accordance with our examination of these features. Based on these proposed features, we develop a feature based design methodology for heterogeneous objects. Two enabling methods for this design methodology, material heterogeneity specification within each feature and combination of these material features, are developed. A physics (diffusion) based B-spline method is developed to (1) allow design intent of material variation be explicitly captured by boundary conditions, (2) ensure smooth material variation across the feature volume. A novel method, direct face neighborhood alteration, is developed to increase the efficiency of combining heterogeneous material features.Examples of using this feature based design methodology for heterogeneous object design, such as a prosthesis design, are presented.