scholarly journals GEOMETRIC MODELING AND QUALITY ASSESSMENT OF THE HULL FRAME SURFACE IN COMPASS-3D CAD

2020 ◽  
pp. 81-90
Author(s):  
Anna Yu. Rychenkova ◽  
Ekaterina S. Klimenko ◽  
Lyudmila N. Borodina
Keyword(s):  
Comparative Research ◽  
Geometric Modeling ◽  
Three Dimensional ◽  
Practical Implementation ◽  
Ship Hulls ◽  
3D Cad ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Quantitative Indicators

The article deals with aspects of solving applied problems related to the capabilities of the automated COMPASS 3D system for geometric modeling of shipbuilding objects-vessel hull surfaces. The method for the ship's hull modeling based on flat curves, sections constructed on different offset planes is considered. A method is shown for improving the accuracy of the simulated frame surface of the ship's hull by introducing intermediate sections into the model frame. The concept of the modeling quality of the frame surface and the method of determining quantitative indicators for evaluating the frame surface quality are proposed. The practical implementation of the method of three-dimensional modeling of ship hulls is performed, and the comparative research results on the quality of the ship's surface modeling are presented.

scholarly journals Agustín de Betancourt’s Optical Telegraph: Geometric Modeling and Virtual Reconstruction

2020 ◽  
Vol 10 (5) ◽  
pp. 1857 ◽  
Author(s):  
José Ignacio Rojas-Sola ◽  
Eduardo De la Morena-De la Fuente
Keyword(s):  
3D Modeling ◽  
Geometric Modeling ◽  
3D Model ◽  
18Th Century ◽  
Three Dimensional ◽  
Assembly System ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Virtual Reconstruction ◽  
History Of

This article shows the geometric modeling and virtual reconstruction of the optical telegraph by Agustín de Betancourt and Abraham Louis Breguet developed at the end of the 18th century. Autodesk Inventor Professional software has been used to obtain the three-dimensional (3D) model of this historical invention and its geometric documentation. The material for the research is available on the website of the Betancourt Project of the Canary Orotava Foundation for the History of Science. Thanks to the three-dimensional modeling performed, it has been possible to explain in detail both its operation and the assembly system of this invention in a coherent way. After carrying out its 3D modeling and functional analysis, it was discovered that the transmissions in the telegraph were not performed by hemp ropes but rather by metal chains with flat links, considerably reducing possible error. Similarly, it has also been found that the use of the gimbal joint facilitated the adaptability of the invention to geographical areas where there was a physical impediment to the alignment of telegraph stations. In addition, it was not now necessary for the telescope frames to be located parallel to the mast frame (frame of the indicator arrow) and therefore they could work in different planes.

Modeling in OpenSCAD: examples

2019 ◽  
Author(s):  
Alexander Bashkatov
Keyword(s):  
3D Printing ◽  
Science Teachers ◽  
Geometric Modeling ◽  
Three Dimensional ◽  
Federal State ◽  
Introductory Course ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Graphical Data ◽  
State Educational

The tutorial is an introductory course to the study of the basics of geometric modeling for 3D printing using the programming language OpenSCAD and is built on the basis of descriptions of instructions for creating primitives, determining their properties, carrying out transformations and other service operations. It contains a large number of examples with detailed comments and description of the performed actions, which allows you to get basic skills in creating three-dimensional and flat models, exporting and importing graphical data. Meets the requirements of the Federal state educational standards of higher education of the last generation. It can be useful for computer science teachers, students, students and anyone who is interested in three-dimensional modeling and preparation of products for 3D printing.

scholarly journals Approximation of Generalized Ovals and Lemniscates towards Geometric Modeling

Mathematics ◽  
2021 ◽  
Vol 9 (24) ◽  
pp. 3325
Author(s):  
Valery Ochkov ◽  
Inna Vasileva ◽  
Ekaterina Borovinskaya ◽  
Wladimir Reschetilowski
Keyword(s):  
Computer Aided Design ◽  
Geometric Modeling ◽  
Three Dimensional ◽  
Numerical Data ◽  
Closed Curves ◽  
B Splines ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
High Smoothness ◽  
Aided Design

This paper considers an approach towards the building of new classes of symmetric closed curves with two or more focal points, which can be obtained by generalizing classical definitions of the ellipse, Cassini, and Cayley ovals. A universal numerical method for creating such curves in mathematical packages is introduced. Specific aspects of the provided numerical data in computer-aided design systems with B-splines for three-dimensional modeling are considered. The applicability of the method is demonstrated, as well as the possibility to provide high smoothness of the curvature profile at the specified accuracy of modeling.

Simulation of Multi-Port Gear Pump Based on Virtual Prototyping

2011 ◽  
Vol 338 ◽  
pp. 291-294
Author(s):  
Xiao Yang Yu ◽  
Li Sun
Keyword(s):  
Pressure Difference ◽  
Virtual Prototyping ◽  
Three Dimensional ◽  
Gear Pump ◽  
Design Quality ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Development Cycle ◽  
Fluent Software

In order to reduce the development cycle and improve the design quality of multi-port pump, the virtual prototyping of multi-port pump is built by the function of three-dimensional modeling and virtual assembly of PRO/E, and pump flow status is simulated by FLUENT software, using dynamic grids technology. The simulation results show that: With the change of pressure difference between inlet and outlet, the dynamical characteristics of flow field is different. Meanwhile the pressure difference between inlets and outlet should be reduced in order to improve the performance of gear bump and increase the service life.

scholarly journals MODULAR THREE-DIMENSIONAL MODELING OF THE PROCESS OF REMOVAL OF ADAPTATION AND FORMATION FORMING THE CAMS WITH AN ORIENTED TOOL

2019 ◽  
pp. 34-43
Author(s):  
Olena Sliednikova ◽  
◽  
Volodymyr Vynnyk ◽  
Vasyl Sklyar ◽  
Olga Aksonova ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Depth Of Cut ◽  
Curved Surfaces ◽  
Correct Operation ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Urgent Task ◽  
Crossed Axes ◽  
High Processing

Urgency of the research. Providing high precision cam camshafts and textile machinery while ensuring high processing performance of these parts is an urgent task in the engineering, automotive and textile industries. Target setting. The high accuracy and quality of machined curved surfaces of the cams will ensure the correct operation of the nodes and will increase their service life. Actual scientific researches and issues analysis. Known methods of processing the curved surfaces of the cams of the camshafts, but in these methods, the flow along the contour is uneven, the depth of cut is different, which reduces the accuracy of the machined part and the processing performance. Uninvestigated parts of general matters defining. The study of the process of rough and fair milling of the curved surfaces of the cams of the camshafts and textile machines oriented mill for one installation, which will provide high rates of accuracy and productivity of processing. The research objective. The development of a new method of rough and fair milling of the curved surfaces of the cams of the camshafts and textile machines with crossed cutter axes and parts in one fastening will provide an increase in the accuracy and quality of the processed surfaces and processing performance. The statement of basic materials. The presented method of milling the curvilinear surfaces of the cams of the camshafts, where the roughing and finishing work is carried out by a cutter whose height is less than the length of the cam. Milling of all cams of a camshaft is carried out in one fixing with a tool with crossed axes and parts. When machining the cam-shaped cam surfaces, stabilization of the contour feed and removal of the seam allowance is ensured. That provides increased accuracy and processing performance. Conclusions. The proposed method of milling the curved surfaces of the cams of the camshafts and textile machines with crossed axes of the cutter and parts. The proposed method of milling curvilinear surfaces on CNC machines, where in one pass, roughing and finishing milling of all cams takes place.

Modeling and Simulation of Hydraulic Turnover Device for Large Bearing House

2012 ◽  
Vol 226-228 ◽  
pp. 660-664
Author(s):  
Xin Cai Zhu ◽  
Lei Guo ◽  
You Qing Ding ◽  
Shun Hong Lin
Keyword(s):  
Simulation Analysis ◽  
Model Simulation ◽  
Three Dimensional ◽  
Simulation Software ◽  
Data Format ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Practical Design ◽  
Modeling Software

The geometric models of the hydraulic turnover device are constructed by using three -dimensional modeling software UG, and then they are induced into simulation software ADAMS by a sharing data format. By using ADAMS, models are further simplified and the virtual prototype is established. By using the associated model, the simulation of the hydraulic turnover device is analyzed in ADAMS. Compared with the traditional methods of using physical prototypes, the movement processes and relevant parameters of the hydraulic turnover device can be effectively obtained by means of this method. Furthermore, the quality of the constraint relations between the parts is very important in terms of the accuracy of the model simulation analysis. This simulation results accord with the practical situation, which indicates that the operation is stable and the efficiency is high. It provides a theoretical basis for the practical design of the hydraulic turnover device, which shows that the combination of ADAMS and UG works well.

scholarly journals FORMATION OF PERSONALIZED DIGITAL MODELS BASED ON TOMOGRAPHIC DATA OF THE PATIENT

2021 ◽  
Vol XLIV-2/W1-2021 ◽  
pp. 27-31
Author(s):  
S. Сherebylo ◽  
E. Ippolitov ◽  
M. Novikov ◽  
V. Vnuk
Keyword(s):  
Information Technologies ◽  
Three Dimensional ◽  
Digital Models ◽  
Anatomical Structures ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Digital Medicine ◽  
Tomographic Data ◽  
New Generation

Abstract. The introduction of information technologies into the practice of healthcare significantly changes the methods of diagnosis and treatment, the forms of interaction of doctors with patients and colleagues, the organization of treatment and restoration of health. Modern digital medicine makes it possible to increase the availability, quality and efficiency of medical care.The development of modern three-dimensional modeling and the introduction of a new generation of spiral computed tomographs have significantly expanded the possibilities of using these information technologies in reconstructive surgery. The performed study deals with the problems of forming the personalized digital models of anatomical structures according to patient's tomographic data. The principles of tomographic image segmentation are considered. A review and comparison of the specialized software for obtaining of digital models with the use of tomographic data is given. The evaluation of the functionality, speed and quality of the models is presented. Practical recommendations on the use of the software for creating digital models for medical applications are given. The issues of certification of personalized models and medical products are discussed.

Exploration of Teaching System Reform in Modern Engineering Graphics

2010 ◽  
Vol 44-47 ◽  
pp. 2696-2700
Author(s):  
Shan Zhong
Keyword(s):  
Geometric Modeling ◽  
Three Dimensional ◽  
System Reform ◽  
Teaching System ◽  
Engineering Graphics ◽  
Modeling Technology ◽  
Teaching Reform ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Modern Engineering

Introducing three-dimensional modeling technology into the teaching of modern engineering graphics is a hot topic for graphics areas in recent years. Three-dimensional geometric modeling principles, methods, and skills will be integrated and infiltrated to modern engineering graphics course, and this will form a new teaching theory, content and process with modern engineering graphics teaching trends. The teaching reform of modern engineering graphics in the three- dimensional modeling environment must be imperative. This paper analyzes the shortcomings of a traditional teaching system, and explores the teaching mode which three-dimensional modeling is as the mainline and integrates two-dimensional design. Also proposes a combination of teaching methods, and makes the exploration of teaching reform.

scholarly journals КАРКАСНА МОДЕЛЬ РОЗТЯГУВАННЯ КУЛІРНОГО ТРИКОТАЖУ ВЗДОВЖ ПЕТЕЛЬНИХ РЯДІВ

2022 ◽  
pp. 60-69
Author(s):  
SVITLANA BOBROVA ◽  
TETIANA YELINA ◽  
LIUDMYLA HALAVSKA ◽  
VOLODYMYR SHCHERBAN ◽  
OKSANA KOLISKO
Keyword(s):  
Geometric Modeling ◽  
Relative Elongation ◽  
Three Dimensional ◽  
Complex Model ◽  
Knitted Fabric ◽  
Three Dimensional Model ◽  
Knitted Fabrics ◽  
Frame Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling

Purpose. The purpose of this study is to develop a mathematical description of the transformation of the frame model of weft-knits under the action of tensile forces in the courswise direction for further three-dimensional modeling of the knited structure.Methodology. Methods of theoretical analysis and synthesis, basics of knitting theory, methods of geometric modeling and parameterization were used in the research process.Findings. Considering the knitwear stretching during the use of the clothing is one of the determining factors of the quality of design decisions. When stretching the weft-knitted fabrics in the coursewise direction, the configuration of its individual stitches’ changes, as well as the thread’s cross-section due to the force interaction between the adjacent structure elements. To simulate the physical and mechanical behavior of knitwear under the stretching, it is suggested using a complex model of knitwear deformation, that includes the suggested frame model of uniaxial coursewise stretching of knitted fabrics. An algorithm for constructing a frame model of stretching a sample of knitted fabric in the coursewise direction is described in the paper. The algorithm is based on the structure parameters, including the wale spacing and course spacing in a dry relaxed state, the relative elongation of the sample at the time of modeling, number of wales and courses in the sample, the coefficient of courses narrowing. Scientific novelty. The paper investigates the features of the transformation of the knitting structure during stretching in the coursewise direction and offers algorithmic and mathematical support for the automated generation of the mesh frame in the context of three-dimensional modeling, which provides for the possibility of considering the dynamics of deformation of knitted fabric undergoing tensile deformations.Practical value. Frame model of the weft-knits deformation and algorithm of mesh-frame construction suggested in the paper, form the basis for determination of coordinates of characteristic points of the structural elements of the knit in a state of uniaxial tension for construction of a three-dimensional model of thread a deformed knitted fabric.

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