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.

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.

Comparative and Computer Assisted Drug Designing of Fatty Acids Isolated from Flowers, Leaves, Stem Bark, Root Bark and Nuts of Semecarpus anacardium L. f. （Anacardiaceae）

Objectives： Computational study will help us in reducing the experimental work. The process of drug discovery involves the designing of molecules with appropriate pharmacophores with the help of various soft wares. The purpose of this paper is to study the probable binding modes of fatty acids on fatty acids after enzymatic hydrolysis of the FAAH （fatty acid amide hydrolase） in different extracts of flowers, leaves, stem bark, root bark and nuts of Semecarpus anacardiurn L. f. by using molecular modeling study and computer assisted drug designing. Nuts yielded 20 fatty acids including saturated, ω-3 unsaturated, ω-6 unsaturated, ω-7 unsaturated and ω-9 unsaturated fatty acids. Based on IR, IH NMR, 13C NMR, MS （mass） spectrometry, GC analysis, the structural elucidation of these isolated fatty acids was established. Methods： A dataset comprising of 20 fatty acids were drawn in ChemDraw and converted into 3D-molecules with all possible tautomers and chiral centers. The minimization of molecules was carried out using PRCG （Polak-Ribiere Conjugate Gradient） method with maximum of 5000 iterations. The minimized compounds were used for protein preparation. The crystal structure of human FAAH （PDB ID： 3K84） is prepared and selected for the docking studies of 20 fatty acids using Schr6dinger docking program module.. Conclusions： In this study, we carried out the molecular docking studies in order to understand the probable binding mode of 20 fatty acids in FAAH from which we identified key active site residues for FAAH, thereby it can be used to design the novel compounds for FAAH targets.

Altium Designer在《电子线路CAD》课程教学中的应用

《电子线路CAD》是普通高校和职业院校电子类专业的必修课。随着软件更新,Protel后续版本DXP,特别是Altium Designer也被广大电子技术设计人员广泛使用,故特以项目实例讲解Altium Designer在《电子线路CAD》课程教学中的应用。

CAD Method to Design Complex Dobby Weaves with Large Repeats

The principle of a CAD method of converting the pre-designed figures in image form into complex dobby weaves with the appearances similar to the original figures is mainly introduced in this paper. A few designed weaves by the created CAD system are also given as examples of the practical application in the area of complex dobby weave designing.

基于CAD/CAE的异形凸模冲头工装设计与优化研究

异形凸模冲头是汽车锁头连接件模具的重要配件,其材料为冷作模具钢DC53,对汽车锁孔冲压有重要作用。传统加工中,加工质量无法保证,生产效率低。设计了专用工装,结合CAD/CAE软件,优化并改进工装结构设计。实际加工对比表明,该工装的设计与优化方案合理,改进工装后,凸模冲头零件生产效率和加工质量均显著提高。该研究对同类异型模具工装设计也具有参考价值。

关于CAD技术在机械可靠性优化设计中的应用研究

机械可靠性优化是机械产品开发的重要组成部分,其优化效果将贯穿于机械产品设计、生产、加工和制造的全生命周期。而将CAD技术应用于机械产品的可靠性优化设计过程中,可以将信息技术与产品设计相结合,实现数据互通,建立信息共享平台,提高机械产品设计效率,有效保证产品质量。本文利用SolidWorks软件完成了销轴的模型创建和应力有限元分析,找到了销轴的结构设计的薄弱点,提高了销轴结构设计可靠性。

Collaborative Design in PDM / 3D CAD Integrated Environment

Some key issues in supporting collaborative design in product data management（PDM ） system and 3D computer aided design（CAD） system integrated environment are analyzed. The general architecture of the integrated environment is divided into five tiers and employs the transparently integrated mode, with the mode, function calling and information exchanging among independent PDM and CAD processes are carried out via message translation /parse approach. Product layout feature（PLF ） model definition is presented, PLF model is used to represent design intention at the preliminary design phase. The collaborative design methodology employing the PLF model in PDM/3D CAD integrated environment is analyzed. The design methodology can speed up the design process, reduce the investment and improve the product quality.

基于工匠训练营的协同育人模式在机械制图与CAD课程的设计与实践

结合机械制造及自动化制图员岗赛证的要求,以工匠训练营融入机械课程与CAD教学中,通过确定思政目标、优化教学内容、推进教学策略、落实考核评价等落实教学过程,实践证明具有良好的成效。

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.

Civil Aircraft Assisted Space-Air-Ground Integrated Networks: Architecture Design and Coverage Analysis

In this paper, we propose a novel AIenabled space-air-ground integrated networks(SAGIN). This new integrated networks architecture consists of LEO satellites and civil aircrafts carrying aerial base stations, called "civil aircraft assisted SAGIN(CAA-SAGIN)". The assistance of civil aircrafts can reduce the stress of satellite networks, improve the performance of SAGIN, decrease the construction cost and save space resources. Taking the Chinese mainland as an example, this paper has analyzed the distribution of civil aircrafts, and obtained the coverage characteristics of civil aircraft assisted networks(CAAN). Taking Starlink as the benchmark, this paper has calculated the service gap of CAAN, and designed the joint coverage constellation. The simulation results prove that the number of satellites in CAASAGIN can be greatly reduced with the assistance of civil aircrafts at the same data rate.

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.

Web-Based Interactive VR-CAD System for Conceptual Design and Analysis

To overcome the bottleneck of the one-way translation from VR （ virtual reality） to CAD in VR-based CAD system, this paper proposes a Web-based VR-CAD system WVCD （ Web-based virtual conceptual designer） to support both customers＇and design team members＇involvement in the conceptual design and analysis activity over the Internet. It provides users with both parametric and freehand methods to create and edit 3D conceptual models with different levels of complexity in a VR environment intuitively without the need of switching between the VR environment and CAD tools. As a simple and low-cost VR-CAD system, WVCD can help to popularize and improve the Web-based collaborative conceptual design.

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。

Design & Reality of CAD/CAM in Laser Beam Scanning Manufacturing System

In laser beam scanning manufacturing(LSM)system the PLT file was adopted as design file.The data of de- sign file were processed by CAD software programmed.And the control model was adopted DEA control model.The DEA model was concerned with not only the distance of the two swaying mirrors,the distance between the swaying mirror and convex lens,the mirror swaying angle and the lens focal length but also the lens central height,the lens convex radius and the medium refractive in- dex.It improved the precision and reduced the error in LBM system.The application of CAD/CAM system in LSM improved the LSM manufacturing velocity and manufacturing quality.

Computer-Aided Rapid Variant Design System for Hydraulic Support

The paper gives a detail analysis on the necessity of rapid hydraulic support design, and presents a computer-aided rapid variant design system for hydraulic support. The system integrates the type selection and embodiment design of hydraulic support. Case-based reasoning and rule-based reasoning are the main reasoning methods. Several crucial problems are discussed.

Design strategy of intelligent CAD for welding positioner scheme design

Traditional CAD technique does not support the design processes such as function definition, conceptual design and preliminary design, which are most creative and play significant roles on the design quality. Because scheme design has close relationship with product structure, performance and technology cost, it is important for applying the intelligent CAD of scheme design to improve the quality and competitive level of the product. The definition and function of welding positioner are discussed in this paper. The new definition of welding positioner extends the research scope of welding positioner to welding fixture and welding positioning motion mechanism. The design process of welding fixture and positioning motion system is described, and the cased based and knowledge based design strategy of welding positioner scheme design intelligent CAD is then put forward, which lays foundation for developing proto type system of welding positioner scheme design.

Supporting Product Family Design in a3D CAD/PDM Integrated System

This paper addresses some key issues in supporting product family design in a 3 D CAD/ PDM integrated system and introduces the techniques developed or adopted in building the integrated system. The general architecture of a 3D CAD/PDM integrated system is organized as five tiers. Multi-agent technology is applied with a collaborative design environment. The rule-based product family architecture （ PFA ） and tabular layouts of article characteristics （TLAC） technique are applied to represent the knowledge for product families. They make the knowledge understandable, simplified and can be exchanged among heterogeneous information systems. A transparently concentric integrated mode is put forward to enable the heterogeneous processes to interact and communicate regardless of the language used to construct each process. With the mode, function calling and information exchanging among different processes are carried out via message translation/parse approach. Currently, the integrated system is implemented in the platform of Windows NT and 2000.

Altium Designer 10软件在《电子线路CAD》课程中的应用

本论文阐述了Altium Designer 10软件的特点,并展示了该软件在《电子线路CAD》课程中的应用实例,说明了该软件在提高学生绘制PCB板图能力方面具有重要意义。