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.

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.

CADGen:Computer-aided design sequence construction with a guided codebook learning

Computer-aided design(CAD)software continues to be a crucial tool in digital twin application and manufacturing,facilitating the design of various products.We present a novel CAD generation method,an agent that constructs the CAD sequences containing the sketch-and-extrude modelling operations efficiently and with high quality.Starting from the sketch and extrusion operation sequences,we utilise the transformer encoder to encode them into different disentangled codebooks to represent their distribution properties while considering their correlations.Then,a combination of auto-regressive and non-autoregressive samplers is trained to sample the code for CAD sequence con-struction.Extensive experiments demonstrate that our model generates diverse and high-quality CAD models.We also show some cases of real digital twin applications and indicate that our generated model can be used as the data source for the digital twin platform,exhibiting designers'potential.

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.

VIRTUAL FUEL-PUMP DESIGN

Some concepts of virtual product are discussed. The key technologies ofvirtual fuel-pump development are in detail analysed, which include virtual fuel-pump productmodeling, intelligent simulation, distributed design environment, and virtual assembly. The virtualfuel-pump development prototype system considers requirement analysis, concept design, injectionpreferment analysis, detailed design, and assembly analysis.

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。

The CAD System Development for Power Plants Pipe-Prefabrication

An intelligent design software system for the power station pipe-prefabrication (PPDS) has been developed in the paper,which is taking pipe material database as core and developed on the platform of AutoCAD and Borland C++. Whereas design and construction of power plants in China belong to different deportments,the input and recognition problem of pipeline system disposition chart must be solved firstly for the prefabrication design.Based on AI technology,the model fast building subsystem (MFBS) was established for entering the 3-D pipeline graph data,so that the problems of reconstruction of pipeline digital model and computer identification of original 2-D design data can be solved. The optimization design scheme in the pipe-prefabrication process has been studied and also the corresponding algorithm put forward.The technique and system mentioned can effectively raise the pipe-prefabrication design quality and efficiency in the con- struction of large scale power plants,reduce the period of design and the waste of raw material.PPCADS has still offered the functions such as the construction design for pipeline prefabricated process,the detailing drawing for manufacturing pipe section and automatic generating the technical files for the completed project.

Design and Development of an Innovative System to Stabilize a Windsurf

Research and development within the windsurfing field is comprised purely of previous experience, prototype building and testing on the water. The use of Computer Aided Design （CAD） systems and simulation packages can significantly help in the design and testing phases by optimizing the design before a prototype is built. In the paper, supported by these software tools, the authors show a new patented system, named iDO, developed with the aim to stabilize the windsurf, to allow reducing the initial difficulties that a beginner meets in the learning phase. The design process, from the idea to the manufacturing aspects, with all the technical and technological problems, is described. The validation product was carried out by means of user evaluation questionnaires from sixty-four windsurfing beginners in several countries over world. The results show that the users are significantly satisfied with the product.

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。

CAD/CAM与传统暂时性修复体边缘及内部适合性的体外研究

目的研究CAD/CAM方法与传统方法对暂时性修复体的边缘及内部适合性的影响。方法将60颗全冠预备标准模型树脂牙随机分成四组(n=15):Protemp^(TM)4组、PMMA组、Cemeo组和Upcera PMMA组。制作出相应冠修复体后,将其粘接于相应的标准模型牙上,水浴24 h,沿颊舌向的定位线切开。体视显微镜放大后拍照,利用Imageview显微测量软件对边缘及内部的参考点的间隙进行测量,并进行统计学分析。结果3组CAD/CAM暂时性修复体间边缘适合性、轴壁适合性、轴牙合线角适合性、牙合面适合性两两比较差异无统计学意义(P>0.05),传统暂时性修复体Protemp^(TM)4与3组CAD/CAM暂时性修复体间任意一组边缘适合性、轴壁适合性、轴牙合线角适合性、牙合面适合性两两比较差异均具有统计学意义(P<0.05)。结论CAD/CAM暂时性修复体的边缘及内部(轴壁、轴牙合线角、牙合面)适合性优于传统直接法制作的暂时性修复体。

新工科背景下化工制图与Auto CAD的过程性教学改革

化工制图与Auto CAD化学工程与工艺专业的一门核心课程,具有较强的理论性和实践性,通过讲授工程制图的基本知识、化工设备图样、化工工艺图样,让学生掌握识图、阅图及绘图的基本能力,课程的教学质量将会直接影响到后续专业课学习、毕业设计质量及化工设计大赛的完成情况等。笔者结合多年的教学积累和教学反思,介绍了化工制图与Auto CAD在教学过程中存在的一些问题,阐述在教学中过程性改革的具体措施。通过改进教学模式,优化过程性评价,培养学生独立思考能力和动手实践能力,为化工企业输送应用型人才。

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。

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。

基于设计知识库的服装CAD/PDM集成技术研究

为了支持服装的快速设计,对基于服装设计知识库的计算机辅助设计(CAD)与产品数据管理系统(PDM)的集成进行了研究.将服装设计知识分为新款开发知识和客户化设计知识进行管理,两者共同组成服装设计知识库,通过该知识库可以将服装设计知识保存起来,随时提供给需要它的用户,从而缩短服装设计周期.对支持服装快速设计的CAD系统和PDM系统进行了功能分析,提出了基于服装设计知识库的CAD/PDM系统集成逻辑数据结构,基于该数据结构可以实现PDM系统和CAD系统在深层次上的紧密集成,从而提高服装新款开发设计的效率,并缩短客户化设计周期,改善设计质量.通过样板变型设计的实例验证了该集成系统可以快速准确地完成样板的变型设计.

大型客机概念设计的外形参数化CAD模型

为了加快飞机概念设计中外形造型的进程,应用一种基于形状函数/分类函数变换的参数化建模方法,研究出一种针对大型客机CAD模型的外形参数化方法。该方法可以用较少的参数来完成机身、机翼、短舱等飞机部件的外形建模。采用CATIA二次开发技术,开发了一个面向大型客机概念设计的参数化CAD模型快速生成的软件。精度测试表明,用该软件生成的机翼-机身组合体CAD模型完全能满足概念设计的精度需求,并为以后进一步实现客机多学科设计优化系统打下了基础。

CAD/CAM技术在义齿快速成形中的应用与发展

义齿计算机辅助设计与制作技术是先进制造技术与口腔医学相结合的产物。在设计与制造技术层面上分析了其各项基础单元技术和系统集成技术 ,包括原始信息采集、数据库建立、数据处理和数控加工技术及设备等 ,并指出进一步发展义齿CAD/CAM系统的研究方向。

传统艺术数字化CAD技术研究

以剪纸传统艺术的数字化设计为例,研究了剪纸的计算机辅助技术方案。利用CAD技术辅助完成剪纸艺术中的低效、重复和非创意性工作内容,抽象出剪纸元素符号库;采用路径装饰、折叠及多方案组合设计技术,实现了基于CorelDraw的剪纸CAD原型系统,并以典型传统图案为例进行了设计过程的验证。

固体火箭发动机集成初步设计CAD系统研究

系统论述固体火箭发动机设计的特征后 ,构造了发动机 CAD系统框架 ,并对该系统的主要组成模块的设计进行了有效的探索 ,加速了 CAD技术在固体火箭发动机设计中的应用。已成功地研制了系统的几个重要模块 ,在工程中得到了应用 ,并提出了可行的深入研究方案。研究结果可为固体火箭发动机 CAD系统研制提供重要的技术参考。