Computer-aided Industrial Design Research Articles

Multi-modal fusion network guided by prior knowledge for 3D CAD model recognition

Currently, the 3D CAD model has found extensive use in various applications. The more accurate recognition and more reliable reuse of 3D computer-aided design (CAD) models could significantly save labor costs and time in the production and design of 3D products. However, existing 3D model recognition methods are constrained by a single representation form that lacks supplementary information from multiple sources, and there is a lack of corresponding guidance for relationships between different data. In this paper, we focus on multi-modal information for 3D model representation and propose a Multi-modal Fusion Network (MMFN) guided by prior knowledge for 3D CAD model recognition. In particular, we consider prior knowledge about the class distribution of 3D models: The designed labeling information is utilized as the prior knowledge to guide the multi-modal information fusion via the cross-attention structure. Then, the contrastive learning method is utilized in the optimization step, further increasing the aggregation of similar samples and contributing to enhancing the discriminative capability of features. Finally, we conduct extensive experiments on the public datasets, ModelNet, ShapeNet, and a challenging industrial 3D CAD dataset built by ourselves. Compared to state-of-the-art approaches, our MMFN provides competitive results. The source code has been published on Github: https://github.com/WhiteTJU/MMFN.

Virtual Reality Integration in Top-Down Communication Technology and Computer-Aided Industrial Design for Geometric Modeling Advancements

Virtual Reality Integration in Top-Down Communication Technology and Computer-Aided Industrial Design for Geometric Modeling Advancements

Retracted: Multimedia Computer-Aided Industrial System Design Based on the Study of Big Data Mining Algorithm

Retracted: Multimedia Computer-Aided Industrial System Design Based on the Study of Big Data Mining Algorithm

Computer-Aided Industrial Product Design based on Image Enhancement Algorithm and Convolutional Neural Network

Computer-Aided Industrial Product Design based on Image Enhancement Algorithm and Convolutional Neural Network

Research on the Application of Computer-Aided Industrial Design and 3D Printing Technology: A Comprehensive Perspective Analysis

With the continuous development and popularization of computer-aided industrial design technology and 3D printing technology, the integration of the two is also receiving more and more attention. Starting from the basic principles and development history of computer-aided industrial design technology and 3D printing technology, this paper introduces the advantages and current situation of the integration of the two, and focuses on exploring the integration of computer-aided industrial design and 3D printing technology in product design, process analysis, and manufacturing process optimization. Finally, the development trend and future prospects of integration application are summarized.

CFD-CAA Method for Prediction of Pseudosound and Emitted Noise in Quadcopter Propeller

Subsonic flow air blade machines like UAV propellers generate intensive noise thus the prediction of acoustic impact, optimization of these machines in order to reduce the level of emitted noise is an urgent engineering task. Currently, the development of calculation methods for determining the amplitudes of pressure pulsations and noise characteristics by CFD-CAA methods is a necessary requirement for the development of computer-aided design methods for blade machines, where the determining factors are the accuracy and speed of calculations. The main objective is to provide industrial computer-aided design systems with a highly efficient domestic software to create optimal designs of UAV blade machines that provide a given level of pressure pulsations in the flow part and radiated noise. It comprises: 1) creation of a method for the numerical simulation of sound generation using the correct decomposition of the initial equations of hydrodynamics of a compressible medium and the selection of the source of sound waves in a three-dimensional definition, taking into account the rotation of blades and their interaction with the stator part of the UAV; 2) decomposition of the boundary conditions accounting pseudo-sound disturbances and the complex acoustic impedance at the boundaries of the computational domain 3) development of an effective SLAE solver for solving the acoustic-vortex equation in complex arithmetic (taking into account the boundary conditions in the form of complex acoustic impedance); 4) testing of a new method at all stages of development using experimental data on the generation of pressure pulsations and aerodynamic noise, including a propeller noise measurements.

Multimedia Computer-Aided Industrial System Design Based on the Study of Big Data Mining Algorithm

Aiming at the problems of the multimedia computer-aided industrial system, this paper puts forward the application of big data mining algorithm to multimedia computer-aided industrial system design and analyzes in detail the impact of multimedia technology on industrial quality. This paper introduces the advantages of using big data mining algorithm in multimedia computer technology course, shows the operating environment to be met by using the multimedia computer-aided industrial system, follows the guiding principles of the overall design learning theory and artistic conception cognition theory, supplements specific industrial examples, and discusses multimedia industrial design.

Development and Realization of Computer Three-dimensional Aided Design System for Industrial Design

With the continuous development of computer technology and industrial design technology, the traditional manual drawing design method has seriously affected the effect of industrial design. The research on computer-aided industrial design system has gradually attracted the attention of experts and scholars. This paper expounds the application characteristics of computer-aided industrial design technology from CAD industrial design technology in detail, and finally designs the computer-aided industrial design system according to the more mature hierarchy method and structure method, and conducts detailed analysis and comparison of specific components.

Research on the Application of Computer-aided Industrial Design Creative Tools

The development of computer technology very quickly, all sorts of technology appear constantly, the mobile Internet, cloud computing, data mining, Internet of things is generated by the computer technology development, in today’s rapid development of science and technology, the computer in People’s Daily life has become an irreplaceable products, at the same time, the computer technology is also widely used in various industries, such as: aerospace, medical, daily catering and service industry has its shadow. Similarly, the application of computer technology in the industrial design industry will also brings enormous progress to our country the development of industry, can make the industry into a new field in our country, the computer technology can help the industry to carry on the design, make its level greatly increased, at the same time, industrial design also can undertake to improve and develop constantly, improve the design technology, stimulate the creativity of enterprises, improve the innovation consciousness, strengthen innovation. To apply computer technology in industrial design, will be conducive to our country from the manufacturer to upgrade to create power, to further improve industry competitiveness, enhancing national competitiveness, industrial design in the international status of our country significantly improved, also can let China’s industrial technology to get more professional, more stable development. Among them, computer technology plays a very important role in the development of industrial design industry.

Effect of distance between the abutment and the adjacent teeth on intraoral scanning: An in vitro study

Statement of problemThe introduction of intraoral scanners has increased the use of digital technology in dental procedures. However, data on the accuracy of abutment scans according to the distance between the adjacent tooth and the abutment are lacking. PurposeThe purpose of this in vitro study was to compare the 3D accuracy of abutment scans according to the distance between the adjacent tooth and the abutment. Material and methodsA right maxillary first molar was removed and scanned with an industrial 3D scanner, and the image was extracted as a standard tessellation language (STL) file. Six virtual models with 1-mm, 1.5-mm, 2-mm, 2.5-mm, 3-mm, and 3.5-mm spacing between abutment teeth and adjacent teeth were fabricated with an industrial computer-aided design (CAD) software program. Then, 6 master models were fabricated with a 3D printer and copied into dental gypsum. The replicated models (reference models) were scanned 20 times with an intraoral scanner (CS3600); the resulting model was referred to as the CAD test model. The adjacent teeth of the reference models were deleted, and the models were scanned with a laboratory scanner; the resulting model was referred to as the CAD reference model. The CAD reference model was used to measure the scan accuracy in 4 directions (buccal, lingual, mesial, and distal) and 4 areas (occlusal, angle, axial, and margin) by using a 3D inspection software program. The Friedman nonparametric test (α=.05) was used for comparison, and post hoc testing was performed by using the Mann-Whitney U-test and Bonferroni correction method (direction and area variables; α=.0008, distance variable; α=.0003). ResultsThe buccal, lingual, mesial, and distal directions of the abutment were significantly different according to distance (P<.001). The margin, axial, angle, and occlusal regions of the abutment were also significantly different according to distance (P<.001). ConclusionsThe distance between the abutment teeth and adjacent teeth affected the accuracy of the abutment scan. In intraoral scanning, when the distance between the abutment teeth and the adjacent teeth is more than 1.5 mm, the scan error does not increase, and more accurate scan data can be obtained.

SUV Front View Design Method Selected by Multiple Schemes

Based on the parametric sensibility engineering and computer-aided industrial design basis, the SUV forward-looking contour is used as a target to explore a preferred selection model for multiple design schemes under specific images. Samples of the SUV front view were collected, the design variables were defined using the Bézier curve, and representative samples were selected using multivariate analysis and cluster analysis. Through the questionnaire survey, the sensory image of SUV front view contour was screened to obtain pairs of representative images. Using semantic difference method to conduct perceptual image research and analysis of representative samples. According to the analysis results, the correlation models of perceptual images and related design variables are obtained. The effectiveness of the model is verified by the existing model design of the market. The conclusion proves that there is a correlation between the consumer’s emotional image and the position of the SUV front-view contour feature point. The coordinates of the forward-looking contour control point of the design scheme are brought into the relevant consumer image correlation model, and the optimal image is obtained under the image. The design scheme improves the success rate of the front face design of the SUV.

Explicit dynamic isogeometric B-Rep analysis of penalty-coupled trimmed NURBS shells

Isogeometric B-Rep Analysis (IBRA) was the first approach that enabled a full integration of Computer Aided Design (CAD) and Computer Aided Engineering (CAE) based on trimmed NURBS B-Rep models ubiquitous in industrial CAD. However, the applicability of IBRA to explicit dynamic problems such as vehicle crash simulations and especially the effect of trimming and penalty coupling on the critical time step were not systematically investigated in the literature. To fill this gap, we developed Explicit IBRA, a combination of the patch coupling capabilities of IBRA with the explicit dynamic features of the FE solver LS-DYNA.For Explicit IBRA, we particularly (i) developed a new penalty-based B-Rep element formulation for the application to a Reissner–Mindlin shell with six degrees of freedom, (ii) formally extended the IBRA theory to explicit time integration schemes, (iii) showed that the common stability criterion and the maximum eigenvalue-based time step estimation from FE still hold, and (iv) used the IBRA exchange format to implement a closed design workflow between the CAD program Rhinoceros and the solver LS-DYNA. We solved selected benchmark problems, from quasi-static linear elastic to highly dynamic elasto-plastic with large deformations, and obtained accurate results with penalty factors that cause no or only a minor decrease in stable time step size. That is, we found that penalty coupling does not have a severe impact on the critical time step in explicit analysis, making Explicit IBRA practically applicable. Finally, we studied an industrial BMW engine bonnet model under dynamic loading and observed good agreement with reference finite element simulations.

Automatic and high-quality surface mesh generation for CAD models

In this paper, we present a fully automatic framework that tessellates industrial computer-aided design (CAD) models into high-quality triangular meshes. In contrast to previous approaches that are purely parametric or performed directly in 3D space, our method is based on a remeshing algorithm that can achieve accuracy and high-quality simultaneously. Given an input standard CAD model, which is represented by B-rep format,we first rebuild the parametric domain for each surface patch according to an initial triangulation, and then the boundaries of the parametric domain are retriangulated by exploiting the Constrained Delaunay Triangulation (CDT). In the second stage, the 2D triangulation is projected back to the 3D space, and a modified global isotropic remeshing process is applied, which further improves the regularity and angle quality of the tessellated meshes. Experiments demonstrate the validity of the proposed approach and its ability to generate high-quality meshes. Moreover, we evaluate our technique and compare it with state-of-the-art CAD model tessellation approaches.

Automatic recognition and decomposition of rib features in thin-shell parts for mold flow analysis

In mold flow analysis, for greater accuracy, convergence, and application specificity, it is beneficial to apply a hybrid combination of pyramidal, prismatic, and hexahedral meshes to replace traditional tetrahedral meshes. This, however, requires the recognition of specific features from the computer-aided design (CAD) model and decomposition into regions, so that high-quality meshes can be applied. The purpose of this study is to propose a rib recognition and decomposition algorithm for detecting all the types of ribs on thin-shell plastic parts, and decomposing them into rib regions. Conventional rib recognition methods emphasizing only the recognition of the constructing faces are not suitable for high-quality mesh generation, because they cannot provide sufficient information for region decomposition. We employ a concept of parallel pairs of edges to identify regions of regular shape on a rib structure. This not only recognizes the constructing faces, but also evaluates the constructing edges on each regular region. With the edge data on regular regions, the transition regions are recognized and the associated face and edge data are evaluated. This study focuses on the development of a feasible algorithm that can be used to deal with industrial CAD models with various kinds of geometric conditions. Several CAD examples are presented to demonstrate the feasibility of the proposed algorithm.

Development of Computer-Aided Industrial Design Technology

With the development of science and technology, industrial design industry also in development, and at the same time, the industrial market in the design of the products of industry, the species diversity of interest requirement also become increasingly strict. In order to ensure that the industrial design in terms of quality and quantity can better development, computer aided design of the industry establish human-computer interaction, become the key factors of industry design. This paper puts forward based on computer aided the origin of the industrial design, and then puts forward computer-aided industrial design of man-machine interaction of the concept and characteristic, and human-computer interaction application in industrial design, and finally to the future development of human-computer interaction made planning and prospected.

Unifying Theory of Pythagorean-Normal Surfaces Based on Geometric Algebra

Pythagorean-normal (PN) surfaces, defined as rational surfaces admitting rational offsets, are important for industrial Computer-aided Design. Traditionally PN surfaces are considered from the point of view of Laguerre geometry, using three main models: cyclographic model, Blaschke cylinder or isotropic model. We propose a unifying formalism to deal with PN surfaces: all these models are embedded into one ambient pseudo-Euclidean space \({{\mathbb R}^{4, 2}}\), that is known as a model for Lie sphere geometry. Various relations between different models are described in terms of closed formulas in the geometric algebra \({{\mathcal Cl}(4, 2)}\) and illustrated by examples of applications.

Hydrodynamic body shape analysis and their impact on swimming performance.

This study presents the hydrodynamic characteristics of different adult male swimmer's body shape using computational fluid dynamics method. This simulation strategy is carried out by CFD fluent code with solving the 3D incompressible Navier-Stokes equations using the RNG k-ε turbulence closure. The water free surface is captured by the volume of fluid (VOF) method. A set of full body models, which is based on the anthropometrical characteristics of the most common male swimmers, is created by Computer Aided Industrial Design (CAID) software, Rhinoceros. The analysis of CFD results revealed that swimmer's body shape has a noticeable effect on the hydrodynamics performances. This explains why male swimmer with an inverted triangle body shape has good hydrodynamic characteristics for competitive swimming.

Construction of computer-aided industrial design system based on agility

Industrial design is one of most creative human activities and it is a process to solve problems of uncertainty. Agile methods of adaptive ideas and human-centred thinking provide references for the solving of industrial design problems. This paper borrowed agile theories from other relevant fields and evolved the principles of agile industrial design-based agility. The first principle is people-oriented design and building a self-organising team. The second is adaptive design and steadily give valuable designs. The third is adopting light-weight design methods or techniques. The final principle includes some practices. Based on the above, computer-aided industrial design system was constructed for building the platform for computer-aided design and design information management. This platform helped to explore design ideas to the utmost. The core modules of the system consisted of three parts - implicit knowledge track of creative thinking, clients involving in design, computer-aided colour design, and design practices templates.

3D numerical simulation analysis of passive drag near free surface in swimming

The aim of this work is to build a 3D numerical model to study the characteristics of passive drag on competitive swimmers taking into account the impact of the free surface. This model solves the 3D incompressible Navier-Stokes equations using RNG k-ɛ turbulence closure. The volume of fluid (VOF) method is used to locate the free surface. The 3D virtual model is created by Computer Aided Industrial Design (CAID) software, Rhinoceros. Firstly, a specific posture of swimming is studied. The simulation results are in good agreement with the data from mannequin towing experiments. The effects of a swimmer’s arms and legs positions on swimming performance are then studied. Finally, it is demonstrated that the present method is capable of simulating gliding near the free surface.

Based on the Analysis and Study of Computer-Aided Industrial Design (CAID) Technology

With the development and advancement of technology, innovation and support the development of new product design is inseparable from the concept and methods of industrial design, industrial design not only has become an important means of market competition, but also become the country with the economy powerful weapon development. This paper discusses the development of industrial design disciplines to analyze the computer-aided industrial design (CAID) the basic meaning and value, and through man-machine engineering design and creative thinking intelligent technology applications in the study of CAID, will make the final interpretation of the industrial design CAID grand blueprint towards a more diversified and high-level areas continue forward.