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3-D MODELLING OF COMPUTER AIDED GARMENT DESIGN
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作者 杨建国 朱辉 《Journal of China Textile University(English Edition)》 EI CAS 1991年第1期7-10,共4页
This paper describes a method of the computer aided garment design,and discusses 3-D humanbody,wire frame modelling,approaches of expressing and a shading model of the 3-D garment.
关键词 COMPUTER aided design GARMENTS 3-D human BODY model wire FRAME GARMENT model
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An Integrated Geometric Modeling Methodology for 2.5D Cylindrical Prismatic Part for Computer Aided Process Planning
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作者 Viswa Mohan Pedagopu Manish Kumar 《Intelligent Control and Automation》 2014年第4期183-189,共7页
The field of solid modeling has created numerous techniques for unambiguous computer representations of three-dimensional objects. Its data structures and algorithms have been used in a broad range of applications: Co... The field of solid modeling has created numerous techniques for unambiguous computer representations of three-dimensional objects. Its data structures and algorithms have been used in a broad range of applications: Computer-Aided Design and Computer-Aided Manufacturing (CAD/ CAM), robotics, computer vision, computer graphics and visualization, virtual reality, etc. This research paper is used to generate process plan from feature-based modeling, based on an integrated geometric modeling system that supports both feature-based modeling and information storage. Present system is developed only for milling components and limited to selective machining features for prismatic components and further implemented for more machining features to develop algorithms for modeling the components through the input of machining features. As a result, feature information is directly available to downstream activities, and feature extraction is no longer needed. The various systematic steps involved in this approach are study of Design, identification of Features, selection of Processes, Tools and Machines, Machining and Inspection [DFPTMMI]. Machining features generated in the design stage are recognized and stored under the Visual Basic control of CATIA software ActiveX interface. Algorithms are developed for individual features and these algorithms are embedded in Visual Basic forms. This system is discussed and suited for 2.5 Dimensional part approach, however, that can be extended to 3 dimensional prismatic part and complex features machining. Finally a process planning chart has been presented as a model process planning. 展开更多
关键词 modeling FEATURE COMPUTER aided MANUFACTURING design Prismatic Part
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DESIGN OBJECT MODEL AND DESIGN PROCESS MODEL OF COMPUTER AIDED AIRCRAFT CONCEPTUAL DESIGN SYSTEM
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作者 Shen Zhang(Aircraft CAD Research Center, Beijing University of Aeronautics andAstronautics, Beijing, China, 100083) 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1995年第3期198-204,共7页
DESIGNOBJECTMODELANDDESIGNPROCESSMODELOFCOMPUTERAIDEDAIRCRAFTCONCEPTUALDESIGNSYSTEMShenZhang(AircraftCADRese... DESIGNOBJECTMODELANDDESIGNPROCESSMODELOFCOMPUTERAIDEDAIRCRAFTCONCEPTUALDESIGNSYSTEMShenZhang(AircraftCADResearchCenter,Beijin... 展开更多
关键词 computer aided design aircraft design models
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Evaluation of the effect of geometrical parameters on stope probability of failure in the open stoping method using numerical modeling 被引量:12
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作者 Shahriyar Heidarzadeh Ali Saeidi Alain Rouleau 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2019年第3期399-408,共10页
Stress-induced failure is among the most common causes of instability in Canadian deep underground mines.Open stoping is the most widely practiced underground excavation method in these mines,and creates large stopes ... Stress-induced failure is among the most common causes of instability in Canadian deep underground mines.Open stoping is the most widely practiced underground excavation method in these mines,and creates large stopes which are subjected to stress-induced failure.The probability of failure(POF)depends on many factors,of which the geometry of an open stope is especially important.In this study,a methodology is proposed to assess the effect of stope geometrical parameters on the POF,using numerical modelling.Different ranges for each input parameter are defined according to previous surveys on open stope geometry in a number of Canadian underground mines.A Monte-Carlo simulation technique is combined with the finite difference code FLAC3D,to generate model realizations containing stopes with different geometrical features.The probability of failure(POF)for different categories of stope geometry,is calculated by considering two modes of failure;relaxation-related gravity driven(tensile)failure and rock mass brittle failure.The individual and interactive effects of stope geometrical parameters on the POF,are analyzed using a general multi-level factorial design.Finally,mathematical optimization techniques are employed to estimate the most stable stope conditions,by determining the optimal ranges for each stope’s geometrical parameter. 展开更多
关键词 STOPE stability STOPE geometricAL parameters PROBABILITY of failure General FACTORIAL design Numerical modeling Sublevel OPEN STOPING
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Computer aided modeling and pore distribution of bionic porous bone structure 被引量:5
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作者 李虎 杨建宇 +1 位作者 苏鹏程 王宛山 《Journal of Central South University》 SCIE EI CAS 2012年第12期3492-3499,共8页
Artificial bone with porous structure is crucial for tissue scaffold and clinic implants.Scaffold provides structure support for cells and guides tissues regeneration for final tissue structure.A computational aided p... Artificial bone with porous structure is crucial for tissue scaffold and clinic implants.Scaffold provides structure support for cells and guides tissues regeneration for final tissue structure.A computational aided process of porous bone modeling was developed which described the design and fabrication of tissue scaffolds by considering intricate architecture,porosity and pore size.To simulate intricate bone structure,different constructive units were presented.In modeling process,bone contour was gotten from computed tomography(CT)images and was divided into two levels.Each level was represented by relatively reconstructive process.Pore size distribution was controlled by using mesh generation.The whole hexahedral mesh was reduced by unit structure,when a 3D mesh with various hexahedral elements was provided.The simulation results show that constructive structure of porous scaffold can meet the needs of clinic implants in accurate and controlled way. 展开更多
关键词 tissue scaffold geometry modeling porous structure compute aided design optimal design clinic implants
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THE CONCEPT OF PROBE DETECTOR AND ITS APPLICATION IN GEOMETRIC MODELING
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作者 M.Rajbhandari 秦鹏飞 《Journal of Donghua University(English Edition)》 EI CAS 1989年第Z1期86-92,共7页
The concept of′Probe detector′is introduced in this paper with its application in geometricmodeling and graphics.In terms of the concept,the authors derive edge data from the CSG datarepresentation and establish a w... The concept of′Probe detector′is introduced in this paper with its application in geometricmodeling and graphics.In terms of the concept,the authors derive edge data from the CSG datarepresentation and establish a wireframe model. 展开更多
关键词 COMPUTER aided design COMPUTER aided manufacturing geometric modeling GRAPHICS WIREFRAME PROBE DETECTOR
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A NEW SYSTEM FOR COMPUTER AIDED PATTERN DESIGN——CAPDS
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作者 张伯钧 邵世煌 《Journal of China Textile University(English Edition)》 EI CAS 1990年第4期37-44,共8页
This paper proposes a new computer aided pattern design system(CAPDS)in which a uniformmathematical expression is used to construct different objects. In the geometric model, 3 B-splineis adopted as a line model. The ... This paper proposes a new computer aided pattern design system(CAPDS)in which a uniformmathematical expression is used to construct different objects. In the geometric model, 3 B-splineis adopted as a line model. The new system with uniform mathematical expression has the distin-guishing features: curve smoothness and fidelity, convenience to process graphic data in thedatabase and etc.. This paper presents the data structure, the program structure and also the implementation. 展开更多
关键词 COMPUTER aided design data recording design proposals PATTERN design geometric model data structure
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PRELIMINARY STUDY ON GEOMETRIC MODELING OF GEOLOGIC BODY
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作者 Mao Xiancheng and Dai TagenCollege of Resource, Environment and Civil Engineering,Central South University of Technology, Changsha 410083, P. R. China 《中国有色金属学会会刊:英文版》 CSCD 1998年第2期174-177,共4页
PRELIMINARYSTUDYONGEOMETRICMODELINGOFGEOLOGICBODY①MaoXianchengandDaiTagenColegeofResource,EnvironmentandCivi... PRELIMINARYSTUDYONGEOMETRICMODELINGOFGEOLOGICBODY①MaoXianchengandDaiTagenColegeofResource,EnvironmentandCivilEnginering,Centr... 展开更多
关键词 GEOLOGIC BODY geometeric modelING computeraided design
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A Computer-aided Design System for Framed-mould in Autoclave Processing 被引量:1
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作者 Tian-Guo Jin Feng-Yang Bi 《International Journal of Automation and computing》 EI 2010年第3期261-270,共10页
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... 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. 展开更多
关键词 Framed-mould autoclave processing computer-aided design (CAD) temperature field analyzing hybrid model.
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THE APPLICATION OF THE COMPUTER AIDED ANALYSIS IN THE DESIGN OF COALMINE MACHINERY LINKAGES
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作者 寇子明 许步勤 沈现军 《Journal of Coal Science & Engineering(China)》 1996年第1期98-104,共7页
This paper gives and verifies a mathematical model with only one argument which determines the movement parameters of any point in a plane four-bar linkage on the basis of the analysis of mining machinery linkages. C ... This paper gives and verifies a mathematical model with only one argument which determines the movement parameters of any point in a plane four-bar linkage on the basis of the analysis of mining machinery linkages. C A A (computer aided analysis) based on the mathemetical model can be used to make not only the quick and accurate analysis and design of mining machinery linkages but also the movement analysis and optimization design of any other plane four-bar linkage. 展开更多
关键词 linkage mechanism mathematical model computer aided design mining machinery
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On analog circuit design methodology via multi-objective geometric programming
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作者 Theerachet Soorapanth 《通讯和计算机(中英文版)》 2009年第11期43-48,共6页
关键词 几何规划 设计方法 模拟电路 多目标 单目标优化 决策信息 组合成 凸函数
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DESIGN AND IMPLEMENTATION OF A 3-DIMENSIONAL COMPUTER AIDED GARMENT DESIGN SYSTEM
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作者 朱辉 萧众 《Journal of China Textile University(English Edition)》 EI CAS 1991年第2期27-33,共7页
A 3-Dimensional computer aided garment design (CAGD) system has been developed andimplemented on a high-performance workstation. We studied various approaches to the func-tional modelling of garment designs for the sy... A 3-Dimensional computer aided garment design (CAGD) system has been developed andimplemented on a high-performance workstation. We studied various approaches to the func-tional modelling of garment designs for the system. According to the characteristic data of a hu-man body, the models of human body and the garment are displayed on the screen, then we canmodify the garment with various styles and different sizes. The system can transform the 3-Dgarment to the 2-D pieces. The system has improved design efficiency. Various potential alterna-tives and improvement of the system have also been studied and explored. 展开更多
关键词 GARMENTS 3D-computer-aided design model model of human BODY model of GARMENT transformation of the 3-D GARMENT to the 2-D pieces
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COMPUTER AIDED DESIGN OF AIRCRAFT CABIN LAYOUT  被引量:1
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作者 Yang Guong Huang Yuyu(Beijing University of Aeronautics and Astronautics Beijing.100083) P.R.China Wang Jiening(Gansu Polytechnic University Lanzhou, Gansu Province,730050) P.R.China 《Computer Aided Drafting,Design and Manufacturing》 1996年第2期83-89,共2页
The reasonability of cabin layout is studied according to the ergonomic theory on micro-computer. This system includes the anthropometric model,modeling of aircraft seats and cabin,interactive ergonomic analyses on ef... The reasonability of cabin layout is studied according to the ergonomic theory on micro-computer. This system includes the anthropometric model,modeling of aircraft seats and cabin,interactive ergonomic analyses on effect. 展开更多
关键词 ss:computer aided industrial design ERGONOMICS anthropometric model
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OBJECT ORIENTED DATA MODELLING WITH APPLICATIONS TO CAD
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作者 应维云 傅向阳 周儒荣 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1996年第2期69+63-68,共7页
An object oriented data modelling in computer aided design (CAD) databases is focused. Starting with the discussion of data modelling requirements for CAD applications, appropriate data modelling features are introdu... An object oriented data modelling in computer aided design (CAD) databases is focused. Starting with the discussion of data modelling requirements for CAD applications, appropriate data modelling features are introduced herewith. A feasible approach to select the “best” data model for an application is to analyze the data which has to be stored in the database. A data model is appropriate for modelling a given task if the information of the application environment can be easily mapped to the data model. Thus, the involved data are analyzed and then object oriented data model appropriate for CAD applications are derived. Based on the reviewed object oriented techniques applied in CAD, object oriented data modelling in CAD is addressed in details. At last 3D geometrical data models and implementation of their data model using the object oriented method are presented. 展开更多
关键词 computer aided design DATABASES data models object oriented data models complex objects geometrical models
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Implementation of a Sketch Based Approach to Conceptual Aircraft Design Synthesis and Modeling 被引量:8
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作者 刘虎 武哲 +1 位作者 王钢林 王新林 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2004年第4期207-214,共8页
In the context of applying computer aided design tools to aircraft conceptualdesign, a sketch based approach is proposed to help designers turn their original concepts intocomplex numerical models that are usable for ... In the context of applying computer aided design tools to aircraft conceptualdesign, a sketch based approach is proposed to help designers turn their original concepts intocomplex numerical models that are usable for further analysis and optimization. This approachemphasizes the integration of general configuration and the layout of such components as engines,payloads, fuel tanks and landing gears, and the representation of a design scheme as uniform planesketches and three dimensional models. This paper presents the measures adopted to implement theapproach in a prototype system, including the object-oriented data structure, friendly graphicaluser interfaces and basic features of relevant modules. Several examples generated in the prototypeand applications of the results are finally outlined to illustrate the effectiveness of theapproach. 展开更多
关键词 aircraft conceptual design SKETCH geometric modeling computer aided design
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THE RELATIONSHIP BETWEEN PROJECTIVE GEOMETRIC AND RATIONAL QUADRATIC B-SPLINE CURVES
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作者 HAN XI’AN AND HUANG XILI 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 1998年第4期445-450,共6页
Abstract For two rational quadratic B spline curves with same control vertexes, the cross ratio of four collinear points are represented: which are any one of the vertexes, and the two points that the ray initialing f... Abstract For two rational quadratic B spline curves with same control vertexes, the cross ratio of four collinear points are represented: which are any one of the vertexes, and the two points that the ray initialing from the vertex intersects with the corresponding segments of the two curves, and the point the ray intersecting with the connecting line between the two neighboring vertexes. Different from rational quadratic Bézier curves, the value is generally related with the location of the ray, and the necessary and sufficient condition of the ratio being independent of the ray's location is showed. Also another cross ratio of the following four collinear points are suggested, i.e. one vertex, the points that the ray from the initial vertex intersects respectively with the curve segment, the line connecting the segments end points, and the line connecting the two neighboring vertexes. This cross ratio is concerned only with the ray's location, but not with the weights of the curve. Furthermore, the cross ratio is projective invariant under the projective transformation between the two segments. 展开更多
关键词 Computer aided geometric design rational B-spline curve cross ratio weight
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嵌于CAD系统的有限元建模方法及其应用
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作者 吴巧云 刘梓良 +1 位作者 陈旭勇 许峙峰 《铁道工程学报》 EI CSCD 北大核心 2024年第5期79-86,共8页
研究目的:当下,多数有限元分析应用的建模功能较为薄弱,导致复杂结构体系的有限元分析既琐碎又麻烦。另一方面,虽然计算机辅助设计(CAD)应用在建模方面十分强大,由CAD应用建立的模型通常无法用作有限元分析。为此,本文提出一种嵌于CAD... 研究目的:当下,多数有限元分析应用的建模功能较为薄弱,导致复杂结构体系的有限元分析既琐碎又麻烦。另一方面,虽然计算机辅助设计(CAD)应用在建模方面十分强大,由CAD应用建立的模型通常无法用作有限元分析。为此,本文提出一种嵌于CAD系统的有限元建模方法,为说明其有效性及实用性,进一步研发了一款名为DirectMesh的Rhinoceros插件并将其应用于武汉站有限元分析中。研究结论:(1)利用CAD系统所提供的交互性环境及各种建模工具可大幅提高有限元建模的效率;(2)本文所提独立网格生成单元可生成代表单个对象的网格;(3)本文所提综合网格生成单元可生成含多个对象的综合网格系统;(4)本文所提有限元模型生成器可通过网格有效生成复杂结构系统的有限元模型;(5)本文所提方法可大幅提高有限元建模的易用性及效率,有助于提高机械工程、土木工程及岩土工程中仿真模拟工作的智能化程度。 展开更多
关键词 计算机辅助设计 建模 有限元 网格 复杂结构体系
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基于Geomagic Design软件的导种管三维逆向工程设计 被引量:40
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作者 刘立晶 杨慧 《农业工程学报》 EI CAS CSCD 北大核心 2015年第11期40-45,共6页
针对玉米精密播种机使用导种管的结构不合理导致株距均匀性差的问题,该文介绍了一种应用逆向工程设计软件Geomagic Design设计导种管的方法,研制性能优良的导种管。利用悬臂式三坐标测量机对进口曲线型导种管结构进行扫描,获取三维点云... 针对玉米精密播种机使用导种管的结构不合理导致株距均匀性差的问题,该文介绍了一种应用逆向工程设计软件Geomagic Design设计导种管的方法,研制性能优良的导种管。利用悬臂式三坐标测量机对进口曲线型导种管结构进行扫描,获取三维点云数据;通过三维逆向工程软件Geomagic Design减少噪音点、合并、简化、对齐等数据预处理获得网格数据;依照网格数据逐个创建特征重构导种管的三维几何模型;对重建的三维几何模型与网格数据进行误差分析实现三维几何模型的优化;依照所优化的三维几何模型生成工程图纸,完成导种管试制。在丰美2BQX-6玉米免耕精密播种机上进行了试制导种管、进口导种管和无导种管的性能对比试验,结果表明:试制导种管、进口导种管和无导种管的段粒数合格率分别为95%、97%和67%,空段率分别为3%、3%和33%,说明导种管可有效提高播种质量,且本研究试制的导种管与进口导种管性能相当。应用逆向工程设计导种管相对传统的理论研究和试验研究,可以缩短设计周期,降低设计成本;所建的三维几何模型为后续导种管结构研究和改进优化提供了一定参考。 展开更多
关键词 逆向工程 三维 模型 导种管 几何模型
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CAID中变形造型及虚拟雕刻技术探讨 被引量:5
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作者 王玉慧 张玉茹 《机械设计》 CSCD 北大核心 2003年第7期19-21,共3页
提出了用于三角片网格所表示形体的局部变形算法及快速虚拟雕刻算法,并利用自行开发的软件系统和Sensable公司产品Phantom,实现具有力觉的虚拟现实造型。为工业产品设计提供了更为方便的造型手段。
关键词 计算机辅助工业设计 变形造型 虚拟雕刻 力反馈 虚拟现实 三角网格 Caid
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古典家具复杂三维曲面数据测量与模型重建研究
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作者 董磊 张磊 +1 位作者 许帅康 张荣强 《家具与室内装饰》 北大核心 2024年第8期65-71,共7页
本文旨在对古典家具全息三维信息进行数字化保护,以仿古典家具的陈列台座作为逆向建模案例,分析了逆向工程的特点、流程及关键环节,采用三维激光扫描设备对仿古典家具的表面三维数据进行非接触测量,采用逆向工程软件Geomagic Studio对... 本文旨在对古典家具全息三维信息进行数字化保护,以仿古典家具的陈列台座作为逆向建模案例,分析了逆向工程的特点、流程及关键环节,采用三维激光扫描设备对仿古典家具的表面三维数据进行非接触测量,采用逆向工程软件Geomagic Studio对测量数据进行处理,得到较完整的多边形数据模型;以NURBS曲面重建思想应用Solid Works软件进行实体重建,得到参数化实体结构装配模型,经测定,三维模型的尺寸和装配精度均符合样品原型,有利于对古典家具全息三维信息的数字化保护。 展开更多
关键词 计算机辅助设计 逆向工程 曲面测量 模型重建 古典家具
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