Geometric Modeling and Meshing Characteristics of the Toroidal Drive

2004 ◽  
Vol 127 (5) ◽  
pp. 988-996 ◽  
Author(s):  
Ligang Yao ◽  
Jian S. Dai ◽  
Guowu Wei ◽  
Huamin Li
Keyword(s):  
Geometric Modeling ◽  
Geometric Analysis ◽  
Three Dimensional ◽  
Analytical Models ◽  
Design Parameters ◽  
Necessary Condition ◽  
Axial Section ◽  
Three Dimensional Modeling ◽  
Worm Gears ◽  
Meshing Characteristics

This paper investigates the geometric properties of the toroidal drive, reveals the meshing characteristics, and develops analytical models of both axial section and normal section of the toroidal tooth profile. Based on coordinate transformation, the meshing function is obtained and leads to the necessary condition of existence of the enveloping surface. The helix and helix lead angle are then proposed for meshing between the sun-worm and planet worm-gears and both undercutting curve and meshing limit curve are introduced. This further leads to the induced normal curvature for evaluating gearing properties and the selection of the best suitable meshing parameters. The geometric analysis and analytical modeling present a tool for design, leading to three tables of numerical results and design parameters. This is then demonstrated in a three-dimensional modeling of both helical sun-worm and stationary internal gear of the toroidal drive.

Inverse Design and Numerical Control Processing of the Little Bear Punch

2014 ◽  
Vol 687-691 ◽  
pp. 113-116
Author(s):  
Ge Zheng ◽  
Chun Wang ◽  
Bo Huang
Keyword(s):  
Geometric Modeling ◽  
Three Dimensional ◽  
Numerical Control ◽  
Inverse Design ◽  
Engineering Practice ◽  
Engineering Software ◽  
Nc Code ◽  
Three Dimensional Modeling ◽  
Machining Center ◽  
Means Of Measurement

Inverse design is the process of using a certain means of measurement to measure entity or model, and according to the measurements, refactoring physical CAD model through Three-dimensional geometric modeling methods. Basing on the little model, use reverse engineering methods, three-dimensional scanning technology and Raindrop Company produced the inverse engineering software to finish the reverse three-dimensional modeling design of little bear punch. Applying Master CAM to set parameters, simulation run, and automatically generate NC code, in the vertical machining center, complex curved surface NC machining of the model can be finished. In engineering practice, it can improve work efficiency, reduce the labor intensity of product development, and reduce the artificial error of the design.

Structural Modeling of Profiled Edge Laminae (PEL) Tools

2005 ◽  
Vol 127 (1) ◽  
pp. 138-147 ◽  
Author(s):  
Daniel F. Walczyk ◽  
Yong-Tai Im
Keyword(s):  
Three Dimensional ◽  
Tool Material ◽  
Thick Layer ◽  
Experimental Results ◽  
Analytical Models ◽  
Design Parameters ◽  
Fem Modeling ◽  
Tool Shape ◽  
Dimensional Errors ◽  
Shape Changes

Profiled Edge Laminae (PEL) tooling is a thick-layer Rapid Tooling (RT) method that involves assembling an array of laminae—each having a uniquely profiled and beveled top edge—together in a precise and repeatable manner by registering each lamina’s bottom edge and an adjacent side edge to a fixture that has precisely machined edges. The processed laminae are then clamped or bonded into a rigid tool for use in manufacturing (e.g., as a thermoforming mold). Because a PEL tool is inherently more compliant than a solid tool, manufacturing personnel who are considering its use are understandably concerned about excessive tool deflection, which may lead to unacceptable changes in tool shape, decreased tool life due to high stresses and increased wear, and part dimensional errors. The ability to predict deflection (i.e., shape changes) in a laminated construction, either clamped or bonded, is extremely important to promote widespread acceptance of the PEL method. This paper develops basic analytical structural models for both clamped and adhesively bonded PEL tools, which will allow tooling designers and engineers to predict how changing various design parameters (e.g., the number of laminations, tool material, unclamped length of laminations, bonding adhesive, adhesive thickness) affect a tool’s stiffness. Deflection results from these models are shown to agree very well with experimental results. The usefulness of these analytical models is then shown by a design example. Finally, FEM modeling of PEL tools is demonstrated and shown to provide results that agree reasonably well with experimental results. FEM modeling may allow for prediction of shape changes to a PEL tool characterized by a complex three-dimensional surface and subject to arbitrary structural loads.

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.

3D Geometric Modeling of Francis Turbine Blades Based on Wooden Patterns and UG Software

2014 ◽  
Vol 596 ◽  
pp. 606-609
Author(s):  
Lei Lu ◽  
Li Da Zhang
Keyword(s):  
Geometric Modeling ◽  
Simulation Analysis ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Reference Value ◽  
Francis Turbine ◽  
Two Dimensional ◽  
Three Dimensional Modeling ◽  
Blade Section ◽  
Spatial Coordinates

To quickly and easily get a smooth and accurate 3D model of blades, This paper was based on the two-dimensional wooden patterns of the existing francis turbine blades in "AutoCAD", by importing UG software platform, directly translating two-dimensional lines to get three-dimensional wooden patterns, without calculating the spatial coordinates of distribution points on the blade section lines, obtaining the optimized smooth pressure sides and suction sides of the blades by characteristic surface intersecting lines, after partial rounding and sewing the sheets, the process of three-dimensional modeling of blades was finally completed. This takes a solid foundation for hydraulic performance prediction and CFD numerical simulation analysis of the francis turbine. The blade modeling method described in this article has some reference value.

Achieve of Torpedo Shell Parameter Model Based on Secondary Development of UG

2012 ◽  
Vol 542-543 ◽  
pp. 532-536
Author(s):  
Nan Li ◽  
Yun Peng Zhao
Keyword(s):  
Design Process ◽  
Parametric Design ◽  
Three Dimensional ◽  
Secondary Development ◽  
Design Parameters ◽  
Three Dimensional Model ◽  
Three Dimensional Modeling ◽  
Modeling Software ◽  
Shell Parameter ◽  
Set Up

Torpedo shell Modeling is a very important part in the design process. However, the traditional method of torpedo shell modeling is only the GUI of CAD drawing software. If there is change in individual parameters, designers have to start again from scratch. Such method will waste of resources. This paper set up the torpedo shell parametric design process with secondary development language UG / Open API, and user-oriented menu creation tool UG / Open UIStyler of UG,which is a three-dimensional modeling software, So that designers can be directly obtained three-dimensional model of the torpedo shell needing to enter the necessary design parameters. Meanwhile the designers can save design resources, and it helps optimize the latter part of the torpedo shell design.

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.

Three-Dimensional Modeling of Opposed Biconical Cone Screw High-Pressure Seawater Hydraulic Pump

2013 ◽  
Vol 310 ◽  
pp. 287-293 ◽  
Author(s):  
Xin Hua Wang ◽  
Zhi Ben Gong ◽  
Li Wei Wang ◽  
Shun Wen Sun ◽  
Gang Zheng
Keyword(s):  
High Pressure ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Design Parameters ◽  
Hydraulic Pump ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
New Type ◽  
Design And Manufacture ◽  
Matlab Programming

The rotor and stator were major components of the opposed biconinal cone screw high pressure seawater hydraulic pump, which precision of design and manufacture was particularly high, and the combining status between the stator and rotor has a significant impact on the performance of the new type pump, so the related research on above problems are carried out. In order to satisfy the demands of design efficiency and manufacture decision, a fast and simple way was presented to model 3D cone screw and bushing. Three-dimensional space Cartesian coordinates of cone screw and bushing profile with MATLAB programming were obtained according to the cone screw and bushing surface equation and the design parameters,3D curves of cone screw and bushing with MATLAB were rendered, and the feature point space coordinates were imported to Pro/Engineer so as to build cone screw and bushing solid model. Finally, making virtual assembly and checking interference on the screw and the bushing were necessary. The proposed method can make the complex 3D modeling more accurate, feasible and efficient.

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 Selection of optimum device parameters for permanent magnetic field generation

2021 ◽  
Vol 22 (6) ◽  
pp. 176-187
Author(s):  
R. T. Khazieva ◽  
M. D. Ivanov
Keyword(s):  
Magnetic Field ◽  
Energy Efficiency ◽  
Magnetic Fields ◽  
Three Dimensional ◽  
Design Parameters ◽  
Programming System ◽  
Power Circuit ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
The Magnetic Field

THE PURPUSE. To consider the fields of application of electromagnetic treatment of water systems. To analyze the modern literature on the use of constant magnetic fields for dehydration of oil-water emulsions. To develop the design of a device for generating constant magnetic fields and select its parameters. To select the electrical circuit for powering the device. To determine how the energy efficiency of the device changes with an increase in its overall dimensions. METHODS. When solving the problem, the KOMPAS-3D three-dimensional modeling system was used, the magnetic field induction was calculated using the PascalABC programming system, the optimal device parameters were selected using the Microsoft Excel program. RESULTS. The article describes the relevance of the topic, considers the distribution of the magnetic field in the device under development, determines the optimal design parameters for this device and selects the electrical power circuit. CONCLUSION. Calculations have shown that the coefficient taking into account the inhomogeneous distribution of the magnetic field in the device is 0.883. Using the KOMPAS-3D three-dimensional modeling system, a model of the device under development was builttaking into account the obtained relationships.When using a circuit with an uncontrolled rectifier and autotransformer, the power consumed by the device is 2.67 times lower than the power consumed by the device when using a circuit with a controlled rectifier and a transformer. Energy efficiency increases significantly with the increase in device performance.

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