CAE软件操作小百科(12)

1 CAE软件与CAD软件接口问题在模型制作方面,CAD软件的功能远远强于CAE软件,因此,CAD软件与CAE软件之间的接口问题就显得比较重要.模型传递主要有2种方法:一种是通过专用数据接口进行传递,另一种是通过标     

Pro/E二次开发在模型检查技术中的应用

近年来,人们运用CAD/CAE的先进设计方法,提高了产品的设计质量,获得了显著的经济效益,但也逐渐认识到了它在应用中出现的各种问题.在利用有限元法分析结构空间尺寸复杂的产品时,需要将建好的CAD模型转换输出到CAE系统中,但数据传递过程中往往会出现各种问题,耗费用户巨大的时间和精力.本文为了能够顺利地进行有限元分析计算,从研究CAD/CAE模型转换出发,基于VC平台对Pro/E二次开发技术做了一定的探索研究,成功实现了模型转换前CAD模型的预先检查.     

基于边界表达的ParaSolid与ACIS直接双向接口

提出了一种以边界表达Brep作为CAD软件问数据交流接口层的方法。针对目前Parasoljd和ACIS作为主流CAD几何核心这一事实，讨论了如何提取这两大几何核心的Brep，以及如何建立它们之间映射关系，继而通过重构Brep完成接口转换，并给出了实例验证该方法的可行性。     

用InterOp拓展SolidWorks的数据接口

对3D模型进行设计和仿真时,由于各应用程序的数据格式不同,经常需要进行数据转换.比如:一个模型可能是由多种CAD造型软件构造的;在实际应用中,专业的CAM、CAE软件都需要读入不同的模型数据;PDM/PLM软件需要能够直接浏览并管理不同的CAD软件产生数据.以上这些问题都是数据转换接口诞生的原因.     

注塑模具CAD/CAE数据接口技术

本文针对目前注塑模CAD/CAE/CAM集成系统中尚无专用的几何造型软件通过对注塑模CAD,CAE的几何模型数据结构分析,采用数据接口技术实现注塑模CAD与CAE的几何模型转换。     

基于SimXpert实现ProE模型向CAE模型快速转化的模板开发

为实现CAD/CAE集成一体化设计,基于SimXpert开发ProE模型向CAE模型快速转化的模板系统.该系统通过特征命名的方式自动快速地进行CAD与CAE之间的信息传递,从而实现SimXpert模板对ProE模型的识别以及向有限元模型的转换.利用外部XML文件数据库对模型所需要的属性进行自动识别和创建,并对相应的部件赋予这些属性.CAD模型向CAE模型的流程式快速转化可以提高数值模拟的效率.     

基于STEP的三维CAD和PDM系统集成方法研究

研究了基于STEP标准的产品信息模型、CAD数据交换接口、产品数据交换接口,提出了基于STEP中性机制和产品信息模型的三维CAD和PDM系统集成框架,该框架有助于实现广义CAD功能CAD/CAE/CAPP/CAM/CAQ/PDM/ERP之间的系统集成,异地、异构系统在企业间的集成,能够为企业设计和管理信息化提供一体化解决方案.     

基于模板的港口码头三维结构CAD/CAE 集成技术

针对港口码头结构CAD 几何模型生成CAE 单元模型,工程荷载CAD 模 型创建CAE 荷载模型,和CAE 分析结果与CAD 模型的关联关系等问题,利用模板的模型 独立性、规则性和可执行性等特性,研究了基于模板的港口码头三维结构CAD/CAE 集成技 术,定义了截面草图、三维实体和构件等多种CAD 建模模板,定义了机械草图和荷载等多 种荷载建模模板,定义了CAE 分析规则,实现了CAD 几何模型自动生成CAE 单元模型的 功能,定义了荷载转换规则,实现了工程荷载CAD 模型自动创建CAE 荷载模型的功能, 定义了整体模型模板,建立CAE 分析结果与CAD 模型的多对一关系,以此实现了港口码 头三维结构CAD/CAE 集成系统,大大提高了港口码头的设计效率,降低了设计人员的设计 难度,减少了设计错误。     

注塑模系统的数据结构及零件几何描述

本文介绍了注塑模CAD/CAE/CAM系统ASCl.1中零件图形数据的描述和组织方法,并设计了CAD与CAE之间的图形数据接口,从而实现系统集成化。     

Solid2000软件的数据接口

一、概述目前在世界上流行使用的数十种CAD软件都有其各自的优缺点。CAD模型建立之后往往需要将数据传输到CAE、CAM等系统中进行分析计算和加工制造,所以数据接口就显得尤为重要,它是CAD软件的重要组成部分,是进行软件之间协作的途径。商品化的CAD软件都应该有丰富的数据接口。IGES、DWG/DXF等应用层的接口形式被广泛的支持。由于各个CAD系统之间的设计目的、实现方法不尽相同,所以数据传递过程中难免会出现数据丢失。尽量减少数据丢失成为CAD系统数据接口设计的重要原则。Solid2000是国产Windows平台上新一代的CAD软件…     

Parametric CAD/CAE integration using a common data model

This paper proposes a CAD/CAE integration method using a “common data model” (CDM) containing all the required parametric information for both CAD modeling and CAE analysis. CDM is automatically generated by a knowledge embedded program code. The CDM is used as a parametric data model repository and the supply source of input for those associative entities of CAD and CAE models and thus maintaining the associative dependences among them. The structure as well as the data flow in the CDM is governed according to the general and widely used design processes. Thus designers can relate the expected scenarios with the engineering changes proposed and can take the parametric actions accordingly. CDM acts as the centralized parametric input for computer modeling software tools through their APIs. Throughout the design process the common data model gets modified during each development cycle according to designer’s intent, the changes in it are consistently reflected in both CAD and CAE models through regenerations and analysis iterations semi-automatically. The same data model in a suitable file format can be used to work with different CAD and CAE packages. As CDM, CAD and CAE work as different modules interconnected through a develop software prototype package which integrates APIs and knowledge rules embedded in the engineering procedures. However, each of the software tools used for each purpose can vary as per the original data requirement without hindering the process structure. The data model is reusable and the whole process is automated as far as possible so that the embedded expertise in the cycles of the adaptive design and manufacturing can be consistently applied iteratively during product development processes. Also being a data file in a suitable format generated via computer programming, the CDM is convenient to record and store information associated to all the product design revisions.     

质量约束的三维模型建模方法

在当今的智能制造和工业软件设计领域,CAD和CAE是极为重要的技术.但现有的CAD和CAE模型表示方法不统一,在数据交换上需要耗费大量时间,造成了计算资源极大的浪费.非均匀有理B样条(NURBS)模型作为一种兼容CAD和CAE的模型表达方式,以样条曲线为基函数,无须进行交换即可进行等几何分析.本文提出了一种基于质量约束...     

CAE/CAD/CAM curricula implementation - experience at the National University of Singapore

A step-by-step approach to implement CAE/CAD/CAM curricula for undergraduate engineering courses at the National University of Singapore is presented. As the student workload is already quite heavy, each course is examined in detail and the CAE/CAD/CAM contents are carefully blended with the existing course structure. Some students are also assigned CAE/CAD/CAM specific projects to allow them to develop expertise in developing new software packages and building interfaces to existing packages. Experience indicates that CAE/CAD/CAM programmes at the undergraduate level should be implemented in various phases. It is also necessary to consider the state of the local industries in the adoption of the CAE/CAD/CAM technology so that the effort by the university is well synchronized with industry.     

A CAD-CAE integration approach using feature-based multi-resolution and multi-abstraction modelling techniques

In spite of the widespread use of CAD systems for design and CAE systems for analysis, the two processes are not well integrated because CAD and CAE models inherently use different types of geometric models and there currently exists no generic, unified model that allows both design and analysis information to be specified and shared. In this paper, a new approach called the CAD/CAE-integrated approach is proposed and implemented by a feature-based non-manifold modelling system. The system creates and manipulates a single master model containing different types of all of the geometric models required for CAD and CAE. Both a solid model (for CAD) and a non-manifold model (for CAE) are immediately extracted from the master model through a selection process. If a design change is required, the master model is modified by the feature modelling capabilities of the system. As a result, the design and analysis models are modified simultaneously and maintained consistently. This system also supports feature-based multi-resolution and multi-abstraction modelling capabilities providing the CAD model at different levels of detail and the CAE model at various levels of abstraction.     

A method for topological entity correspondence in a replicated collaborative CAD system

In order to utilize the potential advantages of replicated collaborative CAD system to support natural, free, fast and less-constrained multi-user human-to-human interaction, a local-locking mechanism, which can provide fast modeling response, is adopted as concurrency control mechanism for a replicated on-line collaborative CAD system. A human–human interactive modeling is achieved by immediate local execution of modeling operations and exchange of modeling operations across all collaborative sites real-time. In particular, an approach to achieve topological entity correspondence across collaborative sites during modeling procedure, which is critical to guarantee the correctness and consistency of collaborative modeling result, is proposed. A prototype system based on the ACIS geometric modeling kernel is implemented to verify availability of the proposed solution.     

HSC-1.1:A USEFUL TOOL FOR INJECTION MOLDING

An integrated CAD/CAE/CAM system, HSC--1.1, is described in the paper. HSC--1.1integrates surface modeling, mold design, technological simulations and NC machining into a full CAD/CAE/CAM system with data exchange from one module to another. The practice shows that HSC--1.1 is a useful tool for injection molding and can assist engineers in reducing mold cost and improvingmold quality.     

基于STEP标准的通用有限元数据基的构成

在进行工程设计和产品设计时,通常需要应用有限元技术进行设计对象的力学分析,在这个过程中不仅会生成大量的数据,还需要在不同的有限元软件之间,不同的有限元前后处理软件之间,或者有限元软件与ＣＡＤ／ＣＡＭ软件之间进行数据交换,针对目前有限元软件主要采用点对点数据交换模式所存在的缺点,提出了建立为适的交换模式－有限元数据基的设想,并基于ＳＴＥＰ标准构建了有限元数据基的中性文件的表述形式及其ＥＸＰＲＥＳＳ描