Research on Computer Aided Design （CAD） Technique and Novel Pattern for Electronic Architectural Drawing and Perspective

With the progress of computer technology, CAD technique is urgent needed. In this paper, we conduct numerical and theoretical analysis and research on computer aided design technique and novel pattern for electronic architectural drawing and perspective. AUTOCAD drawing soRware because of its versatility and easy entry, in engineering has broad user base, but also because of the basis of general drawing software, often cannot directly use of the existing order efficiently complete professional drawing. We modify the current pattern and introduce our proposed pattern for advancement. The experiment proves the effectiveness of the pattern. In addition, we will conduct more insightful research in the future to nolish the current anoroach.

A Method for Solving Computer-Aided Product Design Optimization Problem Based on Back Propagation Neural Network

Because of the powerful mapping ability, back propagation neural network (BP-NN) has been employed in computer-aided product design (CAPD) to establish the property prediction model. The backward problem in CAPD is to search for the appropriate structure or composition of the product with desired property, which is an optimization problem. In this paper, a global optimization method of using the a BB algorithm to solve the backward problem is presented. In particular, a convex lower bounding function is constructed for the objective function formulated with BP-NN model, and the calculation of the key parameter a is implemented by recurring to the interval Hessian matrix of the objective function. Two case studies involving the design of dopamine β-hydroxylase (DβH) inhibitors and linear low density polyethylene (LLDPE) nano composites are investigated using the proposed method.

Computer Aided Design Technology for Convex Faceted Gem Cuts Based on the Half-Edge Data Structure

Aiming to increase the efficiency of gem design and manufacturing, a new method in computer-aided-design (CAD) of convex faceted gem cuts (CFGC) based on Half-edge data structure (HDS), including the algorithms for the implementation is presented in this work. By using object-oriented methods, geometrical elements of CFGC are classified and responding geometrical feature classes are established. Each class is implemented and embedded based on the gem process. Matrix arithmetic and analytical geometry are used to derive the affine transformation and the cutting algorithm. Based on the demand for a diversity of gem cuts, CAD functions both for free-style faceted cuts and parametric designs of typical cuts and visualization and human-computer interactions of the CAD system including two-dimensional and three-dimensional interactions have been realized which enhances the flexibility and universality of the CAD system. Furthermore, data in this CAD system can also be used directly by the gem CAM module, which will promote the gem CAD/CAM integration.

A Computer-aided Design System for Framed-mould in Autoclave Processing

The general computer-aided design （CAD） software cannot meet the mould design requirement of the autoclave process for composites, because many parameters such as temperature and pressure should be considered in the mould design process, in addition to the material and geometry of the part. A framed-mould computer-aided design system （FMCAD） used in the autoclave moulding process is proposed in this paper. A function model of the software is presented, in which influence factors such as part structure, mould structure, and process parameters are considered; a design model of the software is established using object oriented （O-O） technology to integrate the stiffness calculation, temperature field calculation, and deformation field calculation of mould in the design, and in the design model, a hybrid model of mould based on calculation feature and form feature is presented to support those calculations. A prototype system is developed, in which a mould design process wizard is built to integrate the input information, calculation, analysis, data storage, display, and design results of mould design. Finally, three design examples are used to verify the prototype.

Combine Gearbox Aided Design Based on Artificial Neural Networks

In the optimum design of the self-propelled combine gearbox, the knowledge of ANN is applied to overcome slow calculation and low design efficiency. We did the normative approach of the charts information,then solved the difficult problems in the design process and get satisfactory results. We also completed three-dimensional design of the gearbox in order to verify the rationality of the design visually.

基于CATIA的钢结构CAD与CAE一体化实现方法

为了应对钢结构在实现计算机辅助设计(CAD)与计算机辅助工程(CAE)一体化时的特殊性所带来的挑战,分析和归纳CAD与CAE一体化中数据转换,与几何理想化等关键问题,在此基础上,提出一种基于CATIA V6软件实现钢结构CAD与CAE一体化的方法,并通过一个绑扎桥钢结构的设计案例验证了该方法的有效性。通过所提方法分别实现了CAE几何理想化的自动切换与整合载荷数据至CAD模型的技术目标,从而避免了基于传统方法所带来的数据分离问题,减少了人工介入的低效工作。

工程学科常用CAD软件及功能分析

计算机辅助设计(Computer Aided Design,CAD)已经成为机械、电子、航天、化工及建筑等产业中不可或缺的工具之一。概述CAD软件行业的最新发展趋势和我国在该领域的进展,分析CAD软件的技术创新、产业布局以及国内企业在底层技术研发方面的进展。通过调研国际知名CAD软件公司的最新产品和策略以及国内企业的研发成果,分析CAD软件行业的技术动向。结果显示,CAD软件正朝着云端化、集成化、一体化以及智能化的方向发展,国内外企业都在不断探索新技术与CAD软件的结合,以提高设计效率和产品质量。我国CAD软件行业在政策支持和市场需求增长下将迎来更大发展空间,应加强自主研发和创新力度,以推出更多具有自主知识产权和核心竞争力的CAD产品。

机械零部件的测绘和CAD制图技术

随着现代工业的不断发展,机械零部件的测绘及计算机辅助设计(Computer Aided Design,CAD)制图研究成为工程设计中不可或缺的一环。以机械零部件测绘概述为基础,分析机械零部件测绘流程,详细讨论CAD制图技术在机械零部件测绘中的应用。经过实践证明,机械零部件测绘准确性对于工程设计的成功至关重要,而CAD制图技术应用则能大幅度提高测绘效率。

CAD技术在现代机械制造中的应用与发展

在现代机械制造的背景下,介绍计算机辅助设计(ComputerAided Design,CAD)技术的基本内容和发展历程,探讨CAD技术在机械制造的结构设计、工艺规划、3D打印等方面的应用及发展,同时总结CAD技术在机械制造中的应用优势和面临的挑战,展望其未来的发展方向。

The Creative Design Research of Product Appearance Based on Human-machine Interaction and Interface

Today’s product creative design has rendered many fe atures and has brought a great change in our everyday life, there are many new c hallenges in its traditional theory and principle. According to the traditional design theory, the FBS design model pays more attention to the function and stru cture of the product. But this model still couldn’t strengthen the relation bet ween product appearance design and human-machine design effectively. This paper adopt converse design thinking and presents an improved design thinking methodo logy based on C: FBS for product appearance design and give a general summarizat ion for the features, methods and technology based on human-machine interaction and interface. Meanwhile it also combines with the behavior design of product r elated IT fields and constructs a new outline to improve the design of product a ppearance supported by the technology of computer aided design. So the new metho d about design thinking for computer aided design, the new abstract product design model and the key problem of design thinking based on human-machine inte raction and interface are addressed in this paper. This kind of creative design theory that is driven by human-machine interaction and interface will help the development of CAD software system and the research of product design and manufa cture. Additionally, this paper gives some beneficial characters to address the theory based on human-machine interaction and interface. Meanwhile, combining with the developing of computer technology, the trends of design thinking based on t he technology of human-machine interaction and interface are also analyzed and discussed at the end of this paper.

Application Study on 3D Modeling of Axial Compressor Blades Based on CFD and CAD

A new method for design of turbomachinery blades is presented. The parameters of a compressor blade are created from the Computational Fluid Dynamics （CFD） software CFX-BladeGen, and are inputted to the Computer Aided Design （CAD） software UG for building a curve surface model to create an entity model in UG. The result shows that the blade model is favorable from the entity effect and reflection analysis and the model process is useful for the CAD model creation of turbomachinery blades.

机械CAD与机械制图相结合在机械制造中的实践探索

随着我国科技的不断发展,各类现代化手段被应用于机械制造生产,如机械计算机辅助设计(Computer Aided Design,CAD)与机械制图相结合。该方式不仅能将以往的二维图像转变为三维图像,而且可以使各项数据信息更加准确,有效强化机械产品的设计效果,提升工作效率和质量,切实满足当前工作的开展需求,对于进一步促进我国机械制造事业在社会中的快速发展具有重要意义。

Implementation of road horizontal alignment as a whole for CAD

Road horizontal alignment contains three elements: straight line,circular arc,and clothoid.In AutoCAD,clothoid can only be fitted by polyline or spline,and the graphics which are separated from the road data are independent of each other.Therefore,it is necessary to develop a new curve for road horizontal alignment.Firstly,the differential approximation and series integration methods for clothoid were discussed.Secondly,the geometric formulae for road line which contain the three elements were derived as a whole.Then,the advantages and feasibility of customizing a road line class,which was derived from the curve base class,were analyzed based on ObjectARX(AutoCAD Runtime eXtension) techniques.Finally,the data structure and operations for the road line class were stressed.The experimental results show that the road line can integrate the road elements,graphics and data to implement the graphics-oriented design,which can be widely used in road alignment design.

Design and Implementation of Chinese INAP

The standard interfaces between SCF,SSF,SRF and SDF in Intelligent Network Appli-cation Protocol(INAP)have been recommended by ITU-T.However,there are some gaps inthe INAP for IN system implementation.In addition,Chinese telecommunication networkhas its special situation.In order to implement intelligent network in China,we defined ourown INAP standard based on the Chinese network aspect.In this paper we present our rec-ommendation for a Chinese version of INAP.The basis of design and the implementation ofINAP are also described.

Network Garment Style Design System with Remote Information Access and Auto-Connecting Technology

A Network Garment Style Design System (NGSDS) is proposed to enable the remote style structure drawing design of garment. After the development of the system structure based on network that consists of client end and server end at two remote places, a multi-layer part database based on Oracle platform is presented to store information of different parts of garment style. With the acquirement of remote design data at server end using Http technology, the style design is ultimately implemented at the client end using Auto-connecting algorithms. One empirical example is given to show the implementation of the NGSDS.

国际CAD产业格局与新兴的CAD技术公司

经过 4 0年的不断发展 ,国际CAD产业已经走向成熟 首先分析了当前国际CAD产业的产业格局和生态链 ,将CAD产品和服务提供商划分为三类 :整体解决方案提供商、专业软件提供商、CAD组件开发商 介绍了国际上主流的CAD厂商和产品 ,包括DassaultSystemes,EDS/Unigraphics,PTC ,Autodesk ,SolidWorks等 详细讨论了当前国际上一些新兴的CAD技术公司和产品 ,包括Lattice,ImpactXoft,@Last等 这些新兴公司可能暂时还不为人所熟知 ,但是 ,今天它们所开发的新产品和新技术 。

生物活性人工骨结合CAD/CAM技术重建颅骨板制作系统

目的通过CAD/CAM技术和快速成型技术并结合生物活性人工骨材料的应用,建立个性化设计制造具有良好骨融合性的颅骨板制作系统。方法通过螺旋CT扫描、CAD三维重建成像、快速成型机加工,制成与患者颅骨缺损部位几何形态相同的个性化实体模型,应用石膏翻模工艺和EH复合人工骨材料,制成患者骨修补治疗用颅骨板。结果CAD/CAM技术重建的人工骨颅骨板几何外形与骨缺损部位非常吻合,与健康侧对称,临床效果非常满意。结论生物活性人工骨结合CAD/CAM技术重建颅骨板制作系统为治疗颅骨缺损患者提供了一种新手段,可有效提高临床治疗效果和修复美学效果。