查询词典 CAD

With regard to CAD modeling in reverse engineering, some key techniques, including feature extraction from point cloud and parametric representation, are studied.

本文针对反求工程CAD建模路线：从点云提取特征曲面，再进行曲面参数化CAD造型过程中非常关键的步骤——特征提取进行了深入研究，着重研究了二次曲面特征的提取，并对点云中的全局特征约束优化技术进行了有益的探索。

The application of information share and WWW method in NCCAD is studied to ingeniously present and achieve the DC model of engineering CAD information based on Object-Oriented and drawing hyperlink, which maps the restrict and topology of product information to intra-conjunction and inter-hyperlink of DC Object .

研究信息共享和WWW模式在网络CAD环境中的应用，基于面向对象技术和图形链接技术创造性地提出并实现了工程CAD信息的图元模型，将产品信息模型的约束与拓扑关系映射为图元对象内部关联和外部链接两个层次。

University of Saskatschewan, Saskatoon, Canada Abstract In this paper a new generation of methodology of CAD is used to develop the design and CAD system of modular robots.

摘 要 本文利用新一代计算机辅助设计方法，开展模块机器人的设计方法论和CAD系统的研究，旨在提出解决柔性加工系统的计算机辅助设计智能软件的思路和框架。

The application of figured weaving CAD system is essential in patten and structure design to set the complicated technology to weave multi-color jacquard satin towels.

多色缎档提花毛巾织物的工艺复杂，必须利用纹织CAD系统对花型和组织进行设计，本文从理论和实践两方面对CAD系统及其应用进行分析总结。

A divided B-spline surface model of shoe tree is founded, which offered the sound tree model for the shoemaking CAD/CAM. The calculating equation for control points of the bottom of the shoe tree is established for first time. A new method called LID to construct lateral and front surfaces of the shoe hell is proposed which furnishes the possibility for the hell CAD.

本文建立的楦体分块B样条曲面模型，为制鞋CAD/CAM提供了良好的楦体模型；首次建立并给出了楦底控制点计算方程和楦底分块Bezier曲面模型，奠定了鞋跟鞋底造型的基础；文中提出的设计鞋跟跟口面和跟侧面的LID方法，为鞋跟造型提供了实现可能性。

Based on the example of turbine reverse engineering , the general procedure that can be used to translate the physical object into CAD datum by Surfacer software is determined in this paper1 By going deep into the vector of point-cloud , it's parametrization can be gained by adopting the precept of accumulating chordal parametrization1 According to the principle of const ructing curve using the least square method , the high quality-curve can be gained by modifying curve's parameter1 This paper also empha2sizes on some methods about processing point-cloud , const ructing curve and const ructing surface1 And it can provide several methods to const ruct high quality2CAD model for mould machining1

此栏目为免费论文，可自行复制获取，如需要其他完整论文，可点击论文范文查找摘要本文就涡轮反求造型的实例，采用Surfacer 软件规划出由实物转化为工程CAD 资料的一般流程。在深入分析点云数据的矢量方向基础上，采用积累弦长参数化方案实现点云的参数化；根据最小二乘法曲线拟合原理，修改曲线参数获得高品质曲线；并重点论述了点云处理、曲线生成、建构曲面的方法，为模具加工提供了建构高品质CAD 模型的有效途径。

With the analysis of the problems existing in the CAD application system of SPMC, the paper sets the general objective and basic routes of system design, together with its methodology and process.

在CAD应用系统的设计中，文章通过分析上海港机目前CAD应用系统中存在的问题，确定了系统设计目标和基本思路，提出了系统设计的方法和步骤。

The title and bill of material in engineering drawings are important data source for product data integrated management. In order to reuse the CAD data, the paper presents an effective method for extracting part information from existing engineering drawings. Through analyzing the format of title and bill of material, several shape-position characteristics of tables are summed up from the view of macro-layout and microstructure. A new method to automatically extracting drawing information based on cell-grid and feature-point is proposed along with its algorithm principle and implementation steps. A software package based on the method mentioned above is developed and used in practice.

1引言工程图是工程设计的主要成果和制造加工的主要依据，CAD软件的广泛应用使得传统上对于纸质图纸的管理模式转变为对大量电子文件的管理模式·由于文件系统在实际应用中不能适应复杂大规模的管理模式，已经出现了各种各样的图档管理系统[1]·工程图中包含的零件信息在表现形式上体现纸格式的标准化为批量提取数据提供了可能性·作为计算机处理的对象，图纸信息自动识别成为数据管理和系统集成的一项关键技术·当前CAD管理系统所处理的数据对象比较复杂，面临由不同企业使用不同的绘图软件生成的图纸，其中的标题栏和明细栏或者由软件自动生

Are powerful but expensive unexceptionally. And the independent systems of CAD and CAM are often adopted in most of the enterprises, whose obvious weakness is that the automatic information communication among the systems cannot be realized.

具有CAD/CAM集成功能的大型软件如UG、ProE等，功能强大，但价格昂贵，国内企业普遍采用的CAD和CAM软件大多是独立的系统，不能实现系统之间信息的自动传递和转换。

Finally, the idea of integer design and realization of the system are discussed in details.The carton and carton parts designed is parameterize, and consumer can adjust the carton and carton parts by using these parameters. Using piecing together technique in the system can make up the shortage of the existing carton structure CAD system. The method not only reduces the complicacy of the carton design, but can deal with every face of the carton, and it creates advantageous conditions in carton upholster for the next step.

本文所做的盒片和盒片零件是参数化的，用户可以根据实际需要对盒片及盒片零件的参数进行调整；将拼合技术应用于纸盒结构CAD系统中，可以弥补现有纸盒结构CAD系统的不足；采用拼合技术拼合盒片的设计方法，不但降低了纸盒结构设计的复杂性，而且可以单独处理成盒后的每一个盒面，为下一步对纸盒进行装潢设计创造了有利条件。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失