Cyclic Symmetric Analysis of Fabricated Gear Wheels

1989 ◽  
Author(s):  
V. Ramamurti ◽  
M. Subramaniam ◽  
B. Shanker
Keyword(s):  
Static Load ◽  
Moving Load ◽  
Gear Wheel ◽  
Spur Gear ◽  
Asymmetric Loading ◽  
Computer Aided ◽  
Cyclic Symmetric ◽  
Gear Wheels ◽  
State Stress ◽  
The Web

Abstract A computer aided method of analysis of the web portion of a spur gear is presented. The cyclic symmetric concept is used for solving the problem of the steady state stress analysis (asymmetric loading) when the gear is subjected to a concentrated edge load due to the mating tooth. The effect of cut-outs in the web is studied. The response of the web to a moving load is investigated. The ratio of the forcing frequency to the fundamental frequency of the gear wheel being small, the moving load is approximated as a static load acting at different points. The influence of radial ribs on the behaviour of the gear is also studied.

Finite Element Simulation as a Tool to Evaluate Gear Quality after Gear Rolling

2013 ◽  
Vol 554-557 ◽  
pp. 300-306 ◽  
Author(s):  
Alireza Khodaee ◽  
Arne Melander
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Gear Wheel ◽  
Spur Gear ◽  
Interesting Case ◽  
Shape Accuracy ◽  
Good Surface ◽  
Element Simulation ◽  
Gear Wheels ◽  
Gear Rolling

Gear rolling is a manufacturing technique for gears with many advantages like reduced material consumption, reduced scrap generation, fast cycle times, good surface quality and improved final properties of the gear wheels compared to conventional production technology based on machining. In order to make use of all these advantages it is desired to reach the final shape of the gear wheel already after rolling. This means that post treatments like grinding should be avoided. This puts high requirements on the shape accuracy after gear rolling. In this paper it was studied if finite element simulation could be used to evaluate the shape accuracy after gear rolling. The measurement of shape accuracy of gear wheels is specified in standards like ISO1328-1. The allowed deviations from nominal shape are often of the order of 10-30 μm for very good qualities. So if such evaluation shall be possible from a finite element simulation the accuracy must be of the same order. In order to have sufficient accuracy of the finite element simulation 2D simulations were performed on a spur gear. The FE code DEFORM was utilized. The shape accuracy was evaluated for gear rolling of two cases. One case had gears with the module of 1 mm. The other case involved gears with a significantly larger module of 4 mm. This was an interesting case since it is known that it is more difficult to roll the gear with good accuracy in large modules.

Analysis of Fabricated Gear Wheels Using Cyclic Symmetry in a PC Environment

1997 ◽  
Author(s):  
V. Ramamurti ◽  
A. Bhattacharya ◽  
S. Manjula
Keyword(s):  
Dynamic Behaviour ◽  
Gear Wheel ◽  
Computer Memory ◽  
Cyclic Symmetry ◽  
Heavy Duty ◽  
Eigen Value ◽  
Computer Aided Analysis ◽  
Computer Aided ◽  
Gear Wheels ◽  
Industrial Problem

Abstract A computer aided analysis of a heavy duty fabricated gear wheel is presented. The concept of CYCLIC SYMMETRY and the SKYLINE APPROACH are exploited to reduce the computer memory and time. Static and Eigen value analyses are conducted. This is followed by a Quasi Static analysis which gives an idea of the Dynamic behaviour of the gear wheel. The emphasis has been on the use of the PC for solving this industrial problem.

Stress analysis of webs of rimmed wheels

1981 ◽  
Vol 16 (1) ◽  
pp. 1-8 ◽  
Author(s):  
V Ramamurti ◽  
V Srinivasan
Keyword(s):  
Stress Analysis ◽  
Gear Wheel ◽  
Spur Gear ◽  
Static Stress ◽  
Design Charts ◽  
Annular Disc ◽  
Uniform Ring ◽  
The Web

This paper deals with the static stress analysis of the web portion of a spur gear wheel after idealizing the web as a thin annular disc and the rim as a thin uniform ring. Design charts are included giving the stresses and deflections in non-dimensional form.

A web-based 3D virtual display framework for warp-knitted seamless garment design

2018 ◽  
Vol 30 (3) ◽  
pp. 332-346
Author(s):  
Zhijia Dong ◽  
Gaoming Jiang ◽  
Guoming Huang ◽  
Honglian Cong
Keyword(s):  
Geometric Modeling ◽  
3D Model ◽  
Texture Mapping ◽  
Design System ◽  
Web Based ◽  
Content Type ◽  
Computer Aided ◽  
Virtual Display ◽  
Garment Design ◽  
The Web

Purpose The virtual display of 3D garment is one of the most important features in a computer-aided garment design system. The purpose of this paper is to present a novel web-based 3D virtual display framework for the online design of warp-knitted seamless garment using the latest WebGL and HTML5 technologies. Design/methodology/approach Based on the feature-based parametric 3D human body model, the 3D model of skin-tight warp-knitted seamless garment is established using the geometric modeling method. By applying plane parameterization technology, the 3D garment model is then projected into corresponding 2D prototype pattern and a texture-mapping relationship is obtained. Finally, an online 3D virtual display application framework for warp-knitted seamless garment is implemented on modern WebGL-enabled web browsers using the latest WebGL and HTML5 technologies, which allow garment designers to globally access without installing any additional software or plugin. Findings Based on the 2D/3D model of warp-knitted seamless garment, an online 3D virtual display application running on modern WebGL-enabled web browser is implemented using the latest Javascript, WebGL and HTML5 technologies, which is proven to be an effective way for building the web-based 3D garment CAD systems. Originality/value This paper provides a parametric design method for warp-knitted seamless garment 2D/3D model, and web-based online virtual display of 3D warp-knitted seamless garment is implemented for the first time, which establishes the foundation for the web-based online computer-aided warp-knitted seamless garment design system.

ONE OF THE POSSIBLE APPROACHES FOR DESIGNING A HOB CUTTER FOR MACHINING A SMALL CYCLOIDAL CONE

2021 ◽  
pp. 97-103
Author(s):  
В.В. Куц ◽  
А.А. Панин ◽  
Д.Н. Тютюнов ◽  
К.В. Жилина
Keyword(s):  
Gear Wheel ◽  
Front Surface ◽  
Necessary Condition ◽  
Machining Accuracy ◽  
Small Range ◽  
New Approach ◽  
Main Requirement ◽  
Number Of Factors ◽  
Gear Wheels ◽  
The Cost

Предлагается краткий обзор промышленного производства червячных фрез. Показано, что повышение качества и производительности изготовления зубчатых колес является необходимым условием снижения себестоимости и расширения объемов производства зубчатых колес на отечественных предприятиях. Главным требованием, предъявляемым к зубьям данной фрезы, является то, чтобы в результате заточки по передней поверхности, которая лежит в осевой плоскости фрезы, профиль зубьев сохранялся до почти полного их износа. Поэтому особое внимание уделяется выбору кривой затылования с учётом целого ряда факторов, способствующих совершенствованию процесса обработки. Отмечено, что затылование имеет ряд преимуществ, в сравнении с острой заточкой фрез. Изложен новый подход к проектированию рабочей оснастки для обработки малых колес циклоидной передачи и исследованы теоретически допустимые интервалы изменения задних углов при затыловании. Установлено, что несмотря на преимущества циклоидальной фрезы перед другими типами затылованных фрез в скорости и точности обработки, она имеет один недостаток - довольно малый промежуток применимости на дуге циклоиды. На основе существующих подходов разработан вариант затылования зубьев червячной фрезы по циклоиде The article provides an overview of the industrial production of hob cutters. We show that improving the quality and productivity of gear wheel manufacturing is a necessary condition for reducing the cost and expanding the production of gear wheels at domestic enterprises. The main requirement for the teeth of this cutter is that, as a result of sharpening on the front surface, which lies in the axial plane of the cutter, the profile of the teeth remains sharp until they are almost completely worn out. Therefore, we paid special attention to the choice of the relief curve, taking into account a number of factors that contribute to the improvement of the processing process. We note that relief has a number of advantages in comparison with sharpening of cutters. We give a new approach to the design of working equipment for processing small cycloidal wheels and investigate the theoretically permissible intervals of variation of the rear angles during relief. We established that despite the advantages of a cycloidal cutter over other types of undercut cutters in terms of speed and machining accuracy, it has one drawback - a rather small range of applicability on the cycloid arc. On the basis of existing approaches, we developed a variant of the relief of the teeth of the worm cutter along the cycloid

Evaluation of Mechanical and Thermal Stresses in Polymer Gear Teeth through Simulation Approach

2013 ◽  
Vol 302 ◽  
pp. 468-473 ◽  
Author(s):  
Per Lindholm ◽  
Jian Qin
Keyword(s):  
Thermal Properties ◽  
Thermal Stresses ◽  
Material Selection ◽  
Gear Tooth ◽  
Gear Wheel ◽  
Spur Gear ◽  
Contact Forces ◽  
Mechanical And Thermal Properties ◽  
Gear Mesh ◽  
Tensional Stress

One way to achieve lightweight and lubricant-free drive train is, among others, to convert conventional steel to polymer composite materials. This paper describes a part of this endeavor by taking a spur gear pair as a study object. One of the steel gear wheel is replaced with three different materials including Victrex PEEK 650G, Victrex PEEK 650CA30 and Luvocom PEEK 1105-8165 while keeping the gear geometry unchanged. Mechanical stresses and thermal properties are two major criteria for material selection at this stage. Therefore carbon fiber filled PEEK (Victrex PEEK 650CA30) and PEEK filled with thermal conductive minerals (Luvocom 1105-8165) are chosen to benchmark each of the criterion. The evaluation is done by modeling the gear mesh and analyzing the contact forces and heat generated in the gear tooth. The results show surface temperature on the tooth flanks, root tensional stress and contact pressure during the tooth mesh. The work suggests a guideline of materials selection. Depending on actual application a compromisation between mechanical and thermal properties often needs to be considered within the tolerance boundary in order to obtain optimized results. This work only deals with material selection. Gear design such as optimization of tooth geometry for polymer gears is out of the scope of this study and will not be discussed.

Computer-Aided Spur Gear Design

1969 ◽  
Author(s):  
D. Dana White ◽  
James L. Henderson
Keyword(s):  
Spur Gear ◽  
Gear Design ◽  
Computer Aided

Measurement of Contact Stress on Tooth Flank of Spur Gear Subject to Static Load

2003 ◽  
Vol 2003.4 (0) ◽  
pp. 25-26
Author(s):  
Ichiro MORIWAKI ◽  
Koji WATANABE ◽  
Toshiro MIYATA
Keyword(s):  
Contact Stress ◽  
Static Load ◽  
Spur Gear ◽  
Tooth Flank

3129 Measurement of Contact Stress on Tooth Flank of Spur Gear Subject to Static Load : In Case of Gear Pair with Misalignment

2008 ◽  
Vol 2008.4 (0) ◽  
pp. 55-56
Author(s):  
Ichiro MORIWAKI ◽  
Tatsuya HASHIMOTO ◽  
Natsuki Hirata ◽  
Morimasa Nakamura
Keyword(s):  
Contact Stress ◽  
Static Load ◽  
Spur Gear ◽  
Gear Pair ◽  
Tooth Flank
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