Experimental and Numerical Study of a Loaded Cylindrical PA66 Gear

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Julien Cathelin ◽  
Eric Letzelter ◽  
Michele Guingand ◽  
Jean-Pierre de Vaujany ◽  
Laurent Chazeau
Keyword(s):  
Numerical Method ◽  
Experimental Validation ◽  
Test Bench ◽  
Power Transmission ◽  
Numerical Study ◽  
Viscoelastic Model ◽  
Load Sharing ◽  
Transmission Error ◽  
Light Power ◽  
Root Stress

Polymer gears replace metal ones in many motion and light power transmission applications. This paper presents a numerical method to predict the mechanical behavior of plastic cylindrical gears and its experimental validation. The numerical method uses a viscoelastic model in its linear domain depending on temperature, humidity, and rotational speed. This numerical simulation computes the load sharing between instantaneously engaged gears and provides results such as contact pressure, tooth root stress, or transmission error. The numerical results are then compared to experimental measures on a test bench developed at the LaMCoS laboratory. This comparison allows the validation of the load sharing model.

Numerical Study and Experimental Validation of Effect of Varying Fiber Crack Density on Stiffness Reduction in CFRP Composites

2018 ◽  
Vol 27 (4) ◽  
pp. 1685-1693 ◽  
Author(s):  
Chandrashekhar P. Hiremath ◽  
K. Senthilnathan ◽  
Niranjan K. Naik ◽  
Anirban Guha ◽  
Asim Tewari
Keyword(s):  
Experimental Validation ◽  
Numerical Study ◽  
Crack Density ◽  
Stiffness Reduction ◽  
Cfrp Composites

scholarly journals Numerical Study of Viscoelastic Micropolar Heat Transfer from a Vertical Cone for Thermal Polymer Coating

2019 ◽  
Vol 8 (1) ◽  
pp. 449-460 ◽  
Author(s):  
K. Madhavi ◽  
V. Ramachandra Prasad ◽  
A. Subba Rao ◽  
O. Anwar Bég ◽  
A. Kadir
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Angular Velocity ◽  
Numerical Study ◽  
Relaxation Times ◽  
Viscoelastic Model ◽  
Deborah Number ◽  
Convection Boundary Layer ◽  
Density Parameter ◽  
R Ratio

Abstract A mathematical model is developed to study laminar, nonlinear, non-isothermal, steady-state free convection boundary layer flow and heat transfer of a micropolar viscoelastic fluid from a vertical isothermal cone. The Eringen model and Jeffery’s viscoelastic model are combined to simulate the non-Newtonian characteristics of polymers, which constitutes a novelty of the present work. The transformed conservation equations for linear momentum, angular momentum and energy are solved numerically under physically viable boundary conditions using a finite difference scheme (Keller Box method). The effects of Deborah number (De), Eringen vortex viscosity parameter (R), ratio of relaxation to retardation times (λ), micro-inertia density parameter (B), Prandtl number (Pr) and dimensionless stream wise coordinate (ξ) on velocity, surface temperature and angular velocity in the boundary layer regime are evaluated. The computations show that with greater ratio of retardation to relaxation times, the linear and angular velocity are enhanced whereas temperature (and also thermal boundary layer thickness) is reduced. Greater values of the Eringen parameter decelerate both the linear velocity and micro-rotation values and enhance temperatures. Increasing Deborah number decelerates the linear flow and Nusselt number whereas it increases temperatures and boosts micro-rotation magnitudes. The study is relevant to non-Newtonian polymeric thermal coating processes.

Implementation of DTM as a numerical study for the Casson fluid flow past an exponentially variable stretching sheet with thermal radiation

2021 ◽  
pp. 2150111
Author(s):  
Khadijah M. Abualnaja
Keyword(s):  
Fluid Flow ◽  
Thermal Radiation ◽  
Numerical Method ◽  
Stretching Sheet ◽  
Numerical Solutions ◽  
Numerical Study ◽  
Transformation Method ◽  
Casson Fluid ◽  
Physical Parameters ◽  
Special Cases

This paper introduces a theoretical and numerical study for the problem of Casson fluid flow and heat transfer over an exponentially variable stretching sheet. Our contribution in this work can be observed in the presence of thermal radiation and the assumption of dependence of the fluid thermal conductivity on the heat. This physical problem is governed by a system of ordinary differential equations (ODEs), which is solved numerically by using the differential transformation method (DTM). This numerical method enables us to plot figures of the velocity and temperature distribution through the boundary layer region for different physical parameters. Apart from numerical solutions with the DTM, solutions to our proposed problem are also connected with studying the skin-friction coefficient. Estimates for the local Nusselt number are studied as well. The comparison of our numerical method with previously published results on similar special cases shows excellent agreement.

A 2.5D numerical study on open water hydrodynamic performance of a Voith-Schneider propeller

2019 ◽  
Vol 20 (6) ◽  
pp. 617
Author(s):  
Mohammad Bakhtiari ◽  
Hassan Ghassemi
Keyword(s):  
Numerical Method ◽  
Thrust Force ◽  
Numerical Study ◽  
Open Water ◽  
Hydrodynamic Performance ◽  
Maximum Efficiency ◽  
Water Efficiency ◽  
Blade Thickness ◽  
Unsteady Rans ◽  
Marine Vessels

Marine cycloidal propeller (MCP) is a special type of marine propulsors that provides high maneuverability for marine vessels. In a MCP, the propeller axis of rotation is perpendicular to the direction of thrust force. It consists of a number of lifting blade. Each blade rotates about the propeller axis and simultaneously pitches about its own axis. The magnitude and direction of thrust force can be adjusted by controlling the propeller pitch. Voith-Schneider propeller (VSP) is a low-pitch MCP with pure cycloidal blade motion allowing fast, accurate, and stepless control of thrust magnitude and direction. Generally, low-pitch cycloidal propellers are used in applications with low speed maneuvering requirements, such as tugboats, minesweepers, etc. In this study, a 2.5D numerical method based on unsteady RANS equations with SST k-ω turbulent model was implemented to predict the open water hydrodynamic performance of a VSP for different propeller pitches and blade thicknesses. The numerical method was validated against the experimental data before applying to VSP. The results showed that maximum open water efficiency of a VSP is enhanced by increasing the propeller pitch. Furthermore, the effect of blade thickness on open water efficiency is different at various advance coefficients, so that the maximum efficiency produced by the VSP decreases with increasing blade thickness at different propeller pitches.

scholarly journals Asymmetric flows of complex fluids past confined cylinders: A comprehensive numerical study with experimental validation

2020 ◽  
Vol 32 (5) ◽  
pp. 053103 ◽  
Author(s):  
Stylianos Varchanis ◽  
Cameron C. Hopkins ◽  
Amy Q. Shen ◽  
John Tsamopoulos ◽  
Simon J. Haward
Keyword(s):  
Experimental Validation ◽  
Numerical Study ◽  
Complex Fluids ◽  
Asymmetric Flows

scholarly journals Numerical study and experimental validation of a Roots blower with backflow design

2018 ◽  
Vol 12 (1) ◽  
pp. 282-292 ◽  
Author(s):  
Shu-Kai Sun ◽  
Xiao-Han Jia ◽  
Lin-Fen Xing ◽  
Xue-Yuan Peng
Keyword(s):  
Experimental Validation ◽  
Numerical Study
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