scholarly journals PARAMETRIC DESIGN OF DELTA ROBOT

2016 ◽  
Vol 4 ◽  
pp. 803-806 ◽  
Author(s):  
Mert Gürgen ◽  
Cenk Eryılmaz ◽  
Vasfi Emre Ömürlü
Keyword(s):  
Computer Aided Design ◽  
Parametric Design ◽  
Three Dimensional ◽  
Theoretical Data ◽  
Technical Solution ◽  
3D Cad ◽  
3D Data ◽  
Kinematic Behavior ◽  
Delta Robot ◽  
Aided Design

This article describes a sophisticated determination and presentation of a workspace volume for a delta robot, with consideration of its kinematic behavior. With the help of theoretical equations, optimization is performed with the aid of the stiffness and dexterity analysis. Theoretical substructure is coded in Matlab and three-dimensional (3D) data for delta robot are developed in computer-aided design (CAD) environment. In later stages of the project, both 3D and theoretical data are linked together and thus, with the changing design parameter of the robot itself, the Solidworks CAD output adapts and regenerates output with a new set of parameters. To achieve an optimum workspace volume with predefined parameters, a different set of robot parameters are iterated through design optimization in Matlab, and the delta robot design is finalized and illustrated in the 3D CAD environment, Solidworks. This study provides a technical solution to accomplish a generic delta robot with optimized workspace volume.

scholarly journals Automatized Evaluation of Students’ CAD Models

2021 ◽  
Vol 11 (4) ◽  
pp. 145
Author(s):  
Nenad Bojcetic ◽  
Filip Valjak ◽  
Dragan Zezelj ◽  
Tomislav Martinec
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Computer Application ◽  
Test Cases ◽  
Cad Model ◽  
Computer Solution ◽  
3D Cad ◽  
Computer Aided ◽  
Cad Models ◽  
Aided Design

The article describes an attempt to address the automatized evaluation of student three-dimensional (3D) computer-aided design (CAD) models. The driving idea was conceptualized under the restraints of the COVID pandemic, driven by the problem of evaluating a large number of student 3D CAD models. The described computer solution can be implemented using any CAD computer application that supports customization. Test cases showed that the proposed solution was valid and could be used to evaluate many students’ 3D CAD models. The computer solution can also be used to help students to better understand how to create a 3D CAD model, thereby complying with the requirements of particular teachers.

scholarly journals Accuracy of chair-side fused-deposition modelling for dental applications

2019 ◽  
Vol 25 (5) ◽  
pp. 857-863
Author(s):  
Fusong Yuan ◽  
Yao Sun ◽  
Lei Zhang ◽  
Yuchun Sun
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Production Method ◽  
Fused Deposition Modelling ◽  
Content Type ◽  
Fused Deposition ◽  
3D Data ◽  
Dental Model ◽  
Aided Design ◽  
Dental Applications

Purpose The purpose of this paper is to establish a chair-side design and production method for a tooth-supported fixed implant guide and to evaluate its accuracy. Design/methodology/approach Three-dimensional (3D) data of the alveolar ridge, adjacent teeth and antagonistic teeth were acquired from models of the edentulous area of 30 patients. The implant guides were then constructed using self-developed computer-aided design software and chair-side fused deposition modelling 3D-printing and positioned on a dental model. A model scanner was used to acquire 3D data of the positioned implant guides, and the overall error was then evaluated. Findings The overall error was 0.599 ± 0.146 mm (n = 30). One-way ANOVA revealed no statistical differences among the 30 implant guides. The gap between the occlusal surface of the teeth covering and the tissue surface of the implant guide was measured. The maximum gap after positioning of the implant guide was 0.341 mm (mean, 0.179 ± 0.019 mm). The implanted axes of the printed implant guide and designed guide were compared in terms of overall, lateral and angular error, which were 0.104 ± 0.004 mm, 0.097 ± 0.003 mm, and 2.053° ± 0.017°, respectively. Originality/value The results of this study demonstrated that the accuracy of a new chair-side tooth-supported fixed implant guide can satisfy clinical requirements.

scholarly journals Methods of integrated computer-aided design of structural elements of the aircraft

2015 ◽  
pp. 92-98
Author(s):  
Деніс Миколайович Данилюк ◽  
Геyнадій Анатолійович Вірченко
Keyword(s):  
Computer Aided Design ◽  
Parametric Design ◽  
Three Dimensional ◽  
Integrated Design ◽  
Longitudinal Force ◽  
Structural Elements ◽  
Method Of Calculation ◽  
Computer Aided ◽  
Force Element ◽  
Aided Design

Previously applied methods of designing aircraft based on two-dimensional geometric models that made it impossible to take into account all the necessary design and technological features. It was a prerequisite for the development of an integrated methodology that includes design and computer simulation of three-dimensional parametric design of the aircraft as a whole and its individual parts [2-5]. In this paper, the method of computer-aided design stringer at the master model geometry and space allocation wing aircraft.In article approaches to integrated computer-aided design. These types of problems preliminary design and the method of calculation of typical aircraft structural elements for example longitudinal force element sets as stringer. Also, the algorithm constructs a fully stringer system aided design of integrated Siemens NX. What can shorten the design time and use it as a reference for the calculation and further change just values for other dimensions stringers.Methods integrated design ensure the application of standard parametric analytical stringers in the calculation of aerodynamics and strength, life and vitality, weight of the aircraft and its alignment, safety of structures, as well as technological preparation of production and quality control, maintenance and repair.Considered aided design techniques can be extended to other than the stringers typical elements airframe.

Implementation of methods and algorithms for geometric and structural modeling in the problems of parametric design of a ship's hull structure

2021 ◽  
pp. 159-170
Author(s):  
С.Н. Рюмин ◽  
В.Н. Тряскин
Keyword(s):  
Computer Aided Design ◽  
Parametric Design ◽  
General Structure ◽  
Three Dimensional ◽  
Structural Modeling ◽  
Ship Structures ◽  
Common Structure ◽  
Hull Structure ◽  
Computer Aided ◽  
Aided Design

В работе рассмотрены методология и алгоритмы геометрического и конструктивного моделирования судовых конструкций специализированного программного обеспечения и автоматизированных систем для проектирования конструкции корпуса судна в соответствии с требованиями Правил Российского морского Регистра судоходства и Гармонизированных общих Правил МАКО. Даны понятия геометрического и конструктивного моделирования. Показано место геометрического и конструктивного моделирования в общей структуре системы автоматизированного проектирования судовых конструкций, рассмотрены основы моделирования конструкций в виде плоского конструктивного сечения и трехмерного перекрытия. Описаны возможности специального программного обеспечения – редакторов геометрической и конструктивной модели. Рассмотрена структура специализированного геометрического ядра автоматизированной системы. Приведены примеры использования предлагаемых методов и алгоритмов в разработанном авторами программном обеспечении автоматизированных систем, обоснованы преимущества предлагаемых методов по сравнению с ранее известными решениями. The paper considers the methodology and algorithms for geometric and structural modeling of ship structures, which are used in specialized software of computer-aided systems for the design of the ship's hull structure in accordance with the requirements of the Russian maritime register of Shipping Rules and the IACS Harmonized Common Structure Rules. The concepts of geometric and constructive modeling are given. The place of geometric and structural modeling in the general structure of the computer-aided design of ship structures is shown, the basics of modeling structures in the form of a flat structural section and three-dimensional grillage are considered. The possibilities of special software - editors of geometric and structural models are described. The structure of a specialized geometric kernel of the computer-aided system is considered. Examples of using the proposed methods and algorithms in the developed by authors software of computer-aided systems are given, the advantages of the proposed methods are substantiated in comparison with previously known solutions.

Graph-Based Simplification of Feature-Based Three-Dimensional Computer-Aided Design Models for Preserving Connectivity

2015 ◽  
Vol 15 (3) ◽  
Author(s):  
Soonjo Kwon ◽  
Byung Chul Kim ◽  
Duhwan Mun ◽  
Soonhung Han
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Evaluation Metrics ◽  
Prototype System ◽  
Cad Model ◽  
3D Cad ◽  
Computer Aided ◽  
Cad Models ◽  
Feature Based ◽  
Aided Design

The required level of detail (LOD) of a three-dimensional computer-aided design (3D CAD) model differs according to its purpose. It is therefore important that users are able to simplify a highly complex 3D CAD model and create a low-complexity one. The simplification of a 3D CAD model requires the application of a simplification operation and evaluation metrics for the geometric elements of the 3D CAD model. The evaluation metrics are used to select those elements that should be removed. The simplification operation removes selected elements in order to simplify the 3D CAD model. In this paper, we propose the graph-based simplification of feature-based 3D CAD models using a method that preserves connectivity. First, new evaluation metrics that consider the discrimination priority among several simplification criteria are proposed. Second, a graph-based refined simplification operation that prevents the separation of a feature-based 3D CAD model into multiple volumes is proposed. Finally, we verify the proposed method by implementing a prototype system and performing simplification experiments using feature-based 3D CAD models.

Assessing Mechanical Engineering Undergraduates’ Conceptual Knowledge in Three Dimensional Computer Aided Design (3D CAD)

2012 ◽  
pp. 350-363 ◽  
Author(s):  
Mohd Fadzil Daud ◽  
Jamaluddin Mohd Taib ◽  
Rio Sumarni Shariffudin
Keyword(s):  
Conceptual Understanding ◽  
Subject Matter ◽  
Computer Aided Design ◽  
Conceptual Knowledge ◽  
Procedural Knowledge ◽  
Three Dimensional ◽  
3D Cad ◽  
Computer Aided ◽  
Higher Institution ◽  
Aided Design

Research on the relation between conceptual and procedural knowledge has shown that fusing them enhances understanding of domain knowledge. Various methods have been developed to assess undergraduates’ conceptual understanding of a particular domain. Nevertheless, in the teaching and learning of Computer Aided Design (CAD) in higher education, students were not assessed on their conceptual understanding on the utilization of the software. The assessments of outcome were based on procedural or command knowledge rather than the conceptual understanding, which is usually associated with a particular subject matter. In addition, both types of knowledge are emphasized within the context of achieving outcomes of domain related subject matter such as Machine Design or Technical Drawing. Some students might not be aware that there are concepts underlying the procedure they are using. As such, students’ conceptual knowledge in Three Dimensional Computer Aided Design (3D CAD) is as important as their procedural knowledge. The question now arises as to whether the students acquire adequate conceptual knowledge through a formal or informal learning process in higher institution before they are employed by manufacturing industries. This chapter briefly discusses the concept of developing 3D CAD model. Then, categories of the essential concepts in the development of the model are presented. Implementation of Concept Map to assess students’ conceptual understanding on 3D modeling technique will be addressed.

A CAD Method for Centrifugal Compressor Impellers

1984 ◽  
Vol 106 (2) ◽  
pp. 482-488 ◽  
Author(s):  
H. Krain
Keyword(s):  
Centrifugal Compressor ◽  
Calculation Method ◽  
Computer Aided Design ◽  
Design Method ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Theoretical Data ◽  
Laser Measurements ◽  
Geometrical Concept ◽  
Aided Design

A computer-aided design method (CAD) has been developed for radially ending and backswept centrifugal compressor impellers. The geometrical concept introduced for generating the impeller geometry takes care of numerical, manufacturing, as well as aerodynamic aspects. The fluid dynamic calculation method applied is based on a quasi-three-dimensional approach coupled with a boundary layer calculation method. Detailed quantitative comparisons between theoretical data and laser measurements taken within a radially ending impeller revealed predominantly good agreement. Backswept impellers of different size and shape have been designed by the approach presented.

Advanced Computer Aided Design Simulation of Gear Hobbing by Means of Three-Dimensional Kinematics Modeling

2006 ◽  
Vol 129 (5) ◽  
pp. 911-918 ◽  
Author(s):  
Dimitriou Vasilis ◽  
Vidakis Nectarios ◽  
Antoniadis Aristomenis
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
User Interactions ◽  
3D Data ◽  
Solid Models ◽  
Gear Hobbing ◽  
Kinematics Modeling ◽  
Tool Stresses ◽  
Aided Design ◽  
User Friendly

Gear hobbing, as any cutting process based on the rolling principle, is a signally multiparametric and complicated gear fabrication method. Although a variety of simulating methods has been proposed, each of them somehow reduces the actual three-dimensional (3D) process to planar models, primarily for simplification reasons. The paper describes an effective and factual simulation of gear hobbing, based on virtual kinematics of solid models representing the cutting tool and the work gear. The selected approach, in contrast to former modeling efforts, is primitively realistic, since the produced gear and chips geometry are normal results of successive penetrations and material removal of cutting teeth into a solid cutting piece. The algorithm has been developed and embedded in a commercial CAD environment, by exploiting its modeling and graphics capabilities. To generate the produced chip and gear volumes, the hobbing kinematics is directly applied in one 3D gear gap. The cutting surface of each generating position (successive cutting teeth) formulates a 3D spatial surface, which bounds its penetrating volume into the workpiece. This surface is produced combining the relative rotations and displacements of the two engaged parts (hob and work gear). Such 3D surface “paths” are used to split the subjected volume, creating concurrently the chip and the remaining work gear solid geometries. This algorithm is supported by a universal and modular code as well as by a user friendly graphical interface, for pre- and postprocessing user interactions. The resulting 3D data allow the effective utilization for further research such as prediction of the cutting forces course, tool stresses, and wear development as well as the optimization of the gear hobbing process.

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