查询词典 cad

The authors analyzed the similarities and dissimilarities of data quantity, dimensions mark and cutting off of all kind of line type on CAD digital map, discussed the transferring methods with digital topographic map and CAD technique, automatic cutting profile and engineering quantity fast calculation with Visual Lisp were expounded here, too.

分析了在CAD绘制的数字地图中，常用的各种线型的数据量、尺寸标注、可切断性等异同点，论述了如何利用数字地形图和CAD技术对其进行转换，并用Visual Lisp编程自动切剖面，计算工程量。

The CAD/CAM process of the handle part was implemented, including constructing 3D entity modeler, creating tool path, computer simulating, postprocessing cutter location files into tape files for a specific machine tool, transferring machining information of the handle part by the Network-based CAD/CAM Prototype System, NC machining of the handle part at last.

利用网络化CAD/CAM原型系统实现手柄零件CAD/CAM过程，包括手柄三维实体造型、刀位轨迹生成、计算机仿真检验，后置处理生成特定机床的G代码，通过网络传输手柄零件加工信息，最后完成手柄零件的数控加工。

This dissertation introduces the status quo of structured cabling technology and the application of CAD technology in the field of structured cabling, describes the shop drawing design contents of structured cabling subsystem, introduces the application status quo of optimization algorithm in CAD shop drawing of structured cabling system.

首先，本文对结构化布线技术的发展状况和CAD技术在结构化布线行业的应用情况进行了介绍，对结构化布线系统施工图中各布线子系统的设计进行了阐述，对最优化方法应用于结构化布线系统CAD施工图的应用情况进行了说明。

Main points of the thesis are as follows:(1) The main function models and information relations between these models in the CAPP system in the integrated CAD/CAM project are explained, a new process plan design method is mentioned based on analyses of process plan design. This method is based on the process plan prototype, and develops the prototype little by little until the perfect process plan is completed, the prospect of this method is discussed;(2) The feature abstracting rules and methods are studied, a feature coding system is developed based on GT, all the defined feature models are described by the mathematical methods;(3) The integrated method of CAD/CAPP based on features is mentioned, this method defines a feature exchanging model, and develops an interface software to exchange design data into technology data base, this technology data base includes the design and technology information of the parts;(4) The process plan reasoning method based on features is created, this method uses Mycin algorithm to solve the reasoning of the feature process plan. A process plan making system is developed. In this system part process plan is made by the semi-intelligent method, this method uses the feature reasoning, feature process chain searching and man-computer talking together;(5) The main structure of the HOPE system is introduced, a shaft drawing and its process plan made by this system are shown, the data process problem in process drawing making is also discussed;(6) A new method of describing process rule is introduced, this method uses IfThen rules and neural nets weight values together to describe process rules, the BP algorithm is adopted in this method;(7) The optimal machining sequence problem of the process steps on the same fixturing is discussed, optimal algorithms SA is applied to solve this problem, the result shows that this method is more efficient than the traditional method;(8) All jobs in the thesis are summarized. In order to carry out the research in the future, some rational proposals are given.

全文论述的内容主要有下列几个方面：(1)较为系统地阐述了CAD／CAM一体化工程项目中CAPP系统的主要功能模块及其信息流程，在分析工艺设计过程的基础上，提出了基于特征原型的渐进式工艺设计方法，并探讨了该方法的应用前景；(2)研究了零件特征提取的原则和方法，在成组技术的基础上，开发了一套基于特征的分类编码系统，并在提取零件特征的基础上，定义了零件特征的数据模型，开发了基于轴类零件特征的参数化设计系统；(3)研究了基于特征的CAD／CAPP集成的方法，通过定义零件特征数据模型的存储结构，开发了将设计数据转换到工艺数据库中的接口程序，为后续的CAPP系统提供必要的零件形状和工艺信息；(4)研究了基于特征的工艺推理方法，将Mycin算法应用到工艺决策中，开发了基于特征的工艺推理及工艺方案生成系统，在系统中综合运用特征推理、特征加工工艺链查询及人机对话相结合的半智能化方法确定零件加工工艺；(5)介绍了整个HOPE系统的总体结构，通过运行HOPE系统绘出了一轴类零件的零件图，并生成了该零件的加工工艺方案，初步探讨了基于特征的工序图生成技术中数据处理问题；(6)研究了工艺设计过程中知识如何有效表示的问题，提出了将显式的IF-THEN规则表示与隐式神经网络权值表示相结合的工艺知识表示方法，并利用BP算法进行了工艺知识表示的初步研究；(7)研究了工艺设计过程中同一安装下工步优化排序问题，利用神经网络中基于模拟退火的理论来解决该工步优化排序问题，实践证明该方法较传统的算法具有更高的效率；(8)总结了本文所进行的研究工作，为今后进一步开展工作提出了较为合理的建议。

The development of part copy and scale function in CAD drawing is based on Visual Lisp language quadratic development, which mainly solve the problem that need precise showed and labeled in CAD engineering design drawing.

CAD图形的局部拷贝缩放功能的开发是基于Visual Lisp语言基础上的二次开发，主要地解决工程设计绘图中需要精确显示和标注的局部图形。

Years of CAD technology and systems with the rapid development of CAD / CAM applications to spread rapidly.

三十几年来CAD技术和系统有了飞速的发展，CAD/CAM的应用迅速普及。

The integration of Web and CAD/CAM technique, is the trend of CAD/CAM system.

将Web技术和CAD／CAM技术相结合，是CAD／CAM系统发展的重要方向之一。

With the development of computer network technique and CAD/CAM, it makes a good base for application of CAD technique.

计算机网络技术、CAD／CAM技术的发展，为CAD技术的应用奠定了良好基础。

ABSTRACT As one of the key techniques of the new generation CAD system, the featurebased parametric CAD has been becoming the current resea...

作为新一代CAD系统的关键技术之一，基于特征的参数化技术已经成为当前的一个研究热点。

To solve these problems, virtual reality techniques are brought into CAD community, which yields the socalled VR-CAD system.

为解决这些问题，研究人员将虚拟现实技术引入到CAD系统中，基于虚拟现实的CAD系统应运而生。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？