Computer-Aided Design最新文献_第3页

Handlebody Plesiohedra Unchained: Topologically Interlocked Cell-Transitive 3-Honeycombs 解锁的手体 Plesiohedra：拓扑互锁细胞传递 3-蜂巢

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-08-08 DOI: 10.1016/j.cad.2024.103779

Matthew Ebert , Doyeon Kim , Ergun Akleman , Vinayak Krishnamurthy

{"title":"Handlebody Plesiohedra Unchained: Topologically Interlocked Cell-Transitive 3-Honeycombs","authors":"Matthew Ebert , Doyeon Kim , Ergun Akleman , Vinayak Krishnamurthy","doi":"10.1016/j.cad.2024.103779","DOIUrl":"10.1016/j.cad.2024.103779","url":null,"abstract":"<div><p>We present an approach for systematic design of generalized Plesiohedra, a new type of 3D space-filling shapes that can even include unchained handlebodies. We call these handlebody plesiohedra unchained, since they are <strong>topologically interlocked</strong>, i.e., they can be assembled and disassembled without breaking any of the solids apart and they can keep in place with a set of boundary constraints. These space-filling shapes (i.e. congruent prototiles) are obtained from the Voronoi decomposition of symmetric Delone (Delaunay) point sets. To create this new class of shapes, we generalize the design space of classical Plesiohedra by introducing two novel geometric steps: (a) extension of point sites to piecewise linear approximations of higher-dimensional geometries and (b) extension of symmetries to 3D crystallographic symmetries. We show how these specific collections of higher-dimensional geometries can admit the symmetric Delone property. A Voronoi partitioning of 3D space using these specific collections of higher-dimensional shapes as Voronoi sites naturally results in congruent prototiles. This generalizes the idea of classical Plesiohedra by allowing for piecewise linear approximation of curved edges and faces, non-convex boundaries, and even handlebodies with positive genus boundaries to provide truly volumetric material systems in contrast to traditional planar or shell-like systems. To demonstrate existence of these solid shapes, we produced a large set of unchained congruent space-filling handlebodies as proofs of concept. For this, we focused our investigation using isometries of some space-filling polyhedra, such as a cube and a truncated octahedron with circles, and curve complexes as Voronoi sites. These results point to a rich and vast parametric design space of unchained handlebody plesiohedra making them an excellent representations for engineering applications such as topologically interlocked architectured materials.</p></div>","PeriodicalId":50632,"journal":{"name":"Computer-Aided Design","volume":"177 ","pages":"Article 103779"},"PeriodicalIF":3.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141964515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimum design of uniform and non-uniform infill-coated structures with discrete variables 具有离散变量的均匀和非均匀灌注涂层结构的优化设计

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-08-05 DOI: 10.1016/j.cad.2024.103781

Alain Garaigordobil, José Antonio Postigo, Rubén Ansola, Javier Canales

{"title":"Optimum design of uniform and non-uniform infill-coated structures with discrete variables","authors":"Alain Garaigordobil, José Antonio Postigo, Rubén Ansola, Javier Canales","doi":"10.1016/j.cad.2024.103781","DOIUrl":"10.1016/j.cad.2024.103781","url":null,"abstract":"<div><p>This article introduces a novel computer-aided procedure to design optimised coated structures with precise shell thickness control using the Smallest Univalue Segment Assimilating Nucleus operator and a novel augmentation-projection technique. Structures with heterogeneous sections, or coated structures, combine two different materials for the nucleus and the shell, which are generally chosen so that the material in the infill is lighter and the material in the coating is stiffer, which in this work are supposed homogeneous. Solving the interface problem requires material properties interpolation equations that consider three material phases, accurate placement of the coating over the base material, and precise control over the coating's thickness. The formation of the coating is controlled by the <em>Smallest Univalue Segment Assimilating Nucleus</em>, an edge detection operator developed in <em>Digital Image Processing</em>. The coating's thickness is controlled by an innovative methodology consisting of the projection of an augmented contour field, which is shown to create a constant thickness coating around the material domain. The optimisation problem is solved with the <em>Sequential Element Rejection and Admission</em> method. The validity of the procedure has been verified by solving various numerical application examples.</p></div>","PeriodicalId":50632,"journal":{"name":"Computer-Aided Design","volume":"177 ","pages":"Article 103781"},"PeriodicalIF":3.0,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0010448524001088/pdfft?md5=818e970a6501d02a83f834dc682faba0&pid=1-s2.0-S0010448524001088-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural regularity detection and enhancement for surface mesh reconstruction in reverse engineering 用于逆向工程中曲面网格重建的结构规整性检测与增强

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-08-02 DOI: 10.1016/j.cad.2024.103780

Anyu Mu, Zhenyu Liu, Guifang Duan, Jianrong Tan

{"title":"Structural regularity detection and enhancement for surface mesh reconstruction in reverse engineering","authors":"Anyu Mu, Zhenyu Liu, Guifang Duan, Jianrong Tan","doi":"10.1016/j.cad.2024.103780","DOIUrl":"10.1016/j.cad.2024.103780","url":null,"abstract":"<div><p>Recovering geometric regularities from scanned mesh models with various types of surface features has always been a challenging task in reverse engineering. To address this problem, this paper presents a regularity detection and enhancement framework for surface mesh reconstruction. Initially, surface patches are identified by decomposing the original model into planar, quadric and freeform surface patches. Similar surface patches are aligned with each other by pairwise registration, and symmetry patterns are detected from the accumulated affine transformations using an improved grid fitting method. Regular relations between symmetry patterns and individual surface patches are enumerated and progressively strengthened by orientation, dimension and placement optimizations. Finally, the resultant model with enhanced regularities is obtained by projecting surface patches onto the optimized parametric surfaces iteratively. Comparative experiments on test models demonstrate that the proposed method outperforms existing methods in recovering both lower- and higher-level regularities of engineering models, especially those with freeform surfaces.</p></div>","PeriodicalId":50632,"journal":{"name":"Computer-Aided Design","volume":"177 ","pages":"Article 103780"},"PeriodicalIF":3.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141978706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mesh Denoising of Developable Surfaces with Curved Foldings 带曲线折叠的可展开曲面的网格去噪

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-07-29 DOI: 10.1016/j.cad.2024.103776

Jiale Pan, Pengbo Bo, Yifeng Li, Zhongquan Wang

引用次数: 0

Design methodology of functionally graded cellular materials: Manipulating design parameters of triply periodic minimal surfaces through three-dimensional density distributions 功能分级蜂窝材料的设计方法：通过三维密度分布操纵三重周期极小曲面的设计参数

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-07-24 DOI: 10.1016/j.cad.2024.103778

Emilio A. Ramírez , Nicolas Béraud , Franck Pourroy , François Villeneuve , Jorge L. Amaya , Matthieu Museau

{"title":"Design methodology of functionally graded cellular materials: Manipulating design parameters of triply periodic minimal surfaces through three-dimensional density distributions","authors":"Emilio A. Ramírez , Nicolas Béraud , Franck Pourroy , François Villeneuve , Jorge L. Amaya , Matthieu Museau","doi":"10.1016/j.cad.2024.103778","DOIUrl":"10.1016/j.cad.2024.103778","url":null,"abstract":"<div><p>Functionally Graded Cellular Materials (FGCM) with variable volume fractions have demonstrated significant advantages, including weight reduction, improved stiffness, and enhanced load distribution, when compared to uniform density counterparts. Their design is often characterized by the application of a density distribution to locally modify Representative Volume Elements (RVEs). Current studies have explored the application of Triply Periodic Minimal Surfaces (TPMS) topologies, given their capability to create seamless and interconnected structures, thus avoiding stress concentration issues commonly encountered in traditional lattice configurations. Consequently, this paper introduces a design methodology tailored to TPMS-based FGCM allowing for independent or simultaneous adjustments of RVE thickness and size. Models for predicting relative density as a function of the RVE design parameters of Primitive and Gyroid topologies are presented and discussed. These models are employed to adapt the topologies to three-dimensional density distributions. The proposed method is implemented as a set of design tools and is illustrated for the studied TPMS topologies.</p></div>","PeriodicalId":50632,"journal":{"name":"Computer-Aided Design","volume":"177 ","pages":"Article 103778"},"PeriodicalIF":3.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141850732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Generalizing feature preservation in iso-surface extraction from triple dexel models 在从三重 dexel 模型中提取等值面时实现特征保存的通用化

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-07-24 DOI: 10.1016/j.cad.2024.103777

Tobias Schleifstein , Arne Lorenz , Svenja Schalthöfer , Denys Plakhotnik , Leif Kobbelt

引用次数: 0

Density-Based Isogeometric Topology Optimization of Shell Structures 基于密度的壳体结构等几何拓扑优化

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-07-22 DOI: 10.1016/j.cad.2024.103773

Qiong Pan, Xiaoya Zhai, Falai Chen

{"title":"Density-Based Isogeometric Topology Optimization of Shell Structures","authors":"Qiong Pan, Xiaoya Zhai, Falai Chen","doi":"10.1016/j.cad.2024.103773","DOIUrl":"10.1016/j.cad.2024.103773","url":null,"abstract":"<div><p>Shell structures with high stiffness-to-weight ratios are desirable in various engineering applications. Topology optimization serves as a popular and effective tool for generating optimal shell structures. The solid isotropic material with penalization (SIMP) method is often chosen because of its simplicity and convenience. However, SIMP method is typically integrated with conventional Finite Element Analysis (FEA) which has limitations in computational accuracy. Achieving high accuracy with FEA necessitates a substantial number of elements, leading to computational burdens. In addition, the discrete representation of the material distribution function may result in rough boundaries. Owing to these limitations, this paper proposes an Isogeometric Analysis (IGA) based SIMP method for optimizing the topology of shell structures based on Reissner–Mindlin theory. This method uses Non-Uniform Rational B-Splines (NURBS) to represent both the shell structure and the material distribution function with the same basis functions, allowing for higher accuracy and smoother boundaries. The optimization model takes compliance as the objective function with a volume fraction constraint and the coefficients of the density function as design variables, resulting in an optimized shell structure defined by the material distribution function. To obtain fairing boundaries of the holes in the optimized shell structure, further process is conducted by fitting the boundaries with fair B-spline curves automatically. Furthermore, the proposed IGA-SIMP framework is applied to generate porous shell structures by imposing different local volume fraction constraints. Numerical examples are provided to demonstrate the feasibility and efficiency of the IGA-SIMP method, showing that it outperforms the FEA-SIMP method and produces smoother boundaries.</p></div>","PeriodicalId":50632,"journal":{"name":"Computer-Aided Design","volume":"176 ","pages":"Article 103773"},"PeriodicalIF":3.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141960451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Machine learning-based 3D scan coverage prediction for smart-control applications 基于机器学习的智能控制应用 3D 扫描覆盖范围预测

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-07-20 DOI: 10.1016/j.cad.2024.103775

Tingcheng Li , Arnaud Polette , Ruding Lou , Manon Jubert , Dominique Nozais , Jean-Philippe Pernot

{"title":"Machine learning-based 3D scan coverage prediction for smart-control applications","authors":"Tingcheng Li , Arnaud Polette , Ruding Lou , Manon Jubert , Dominique Nozais , Jean-Philippe Pernot","doi":"10.1016/j.cad.2024.103775","DOIUrl":"10.1016/j.cad.2024.103775","url":null,"abstract":"<div><p>Automatic control of a workpiece being manufactured is a requirement to ensure in-line correction and thus move towards a more intelligent manufacturing system. There is therefore a need to develop control strategies which are capable of taking precise account of real working conditions and enabling first-time-right control. As part of such a smart-control strategy, this paper introduces a machine learning-based approach capable of accurately predicting a priori the 3D coverage of a part according to a scan configuration given as input, i.e. predicting before scanning it which areas of the part will be acquired for real. This corresponds to a paradigm shift, where coverage estimation no longer relies on theoretical visibility criteria, but on rules learned from a large amount of data acquired in real-life conditions. The proposed 3D Scan Coverage Prediction Network (3DSCP-Net) is based on a 3D feature encoding and decoding module, which is capable of taking into account the specifics of the scan configuration whose impact on the 3D coverage is to be predicted. To take account of real working conditions, features are extracted at various levels, including geometric ones, but also features characterising the way structured-light projection behaves. The method is thus able to incorporate inter-reflection and overexposure issues into the prediction process. The database used for the training was built using an ad-hoc platform specially designed to enable the automatic acquisition and labelling of numerous point clouds from a wide variety of scan configurations. Experiments on several parts show that the method can efficiently predict the scan coverage, and that it outperforms conventional approaches based on purely theoretical visibility criteria.</p></div>","PeriodicalId":50632,"journal":{"name":"Computer-Aided Design","volume":"176 ","pages":"Article 103775"},"PeriodicalIF":3.0,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141848848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Guest Editorial: Proceedings of SPM 2024 Symposium 特约编辑：SPM 2024 研讨会论文集

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-07-18 DOI: 10.1016/j.cad.2024.103774

Lucia Romani, Yunbo Zhang, Weiwei Xu

引用次数: 0

Multiresolution lattice-based support generation for additive manufacturing 基于多分辨率网格的增材制造支撑生成技术

IF 3 3区计算机科学

Computer-Aided Design Pub Date : 2024-07-17 DOI: 10.1016/j.cad.2024.103771

Youngjin Park , Q Youn Hong , Gershon Elber

引用次数: 0