scholarly journals Dynamic Behavior of a Railway Wheelset on a Roller Rig versus Tangent Track

2004 ◽  
Vol 11 (3-4) ◽  
pp. 467-492 ◽  
Author(s):  
N. Bosso ◽  
A. Gugliotta ◽  
A. Somà
Keyword(s):  
Numerical Simulation ◽  
Dynamic Behavior ◽  
Experimental Analysis ◽  
Test Bench ◽  
Contact Point ◽  
Full Scale ◽  
Analytical Results ◽  
Roller Rig

This paper addresses the comparison of dynamic behavior of a wheelset on roller and on rails. The development of equations of kinematics and motion allow to put in evidence the intrinsic differences between the dynamic behavior on rail and on roller. The stylized conical profile approximation of the wheel allows to focus the attention on the differences in creepages definition and in contact point shift due to the roller curvature. The treatise is addressed to a full scale roller and can be extended in the case of scaled roller rig to be applied in the case of the test bench developed for experimental analysis. In the present paper numerical simulation and examples are used to proof the analytical results.

Performance and robustness analysis of a Hardware In the Loop full-scale roller-rig for railway braking and traction testing

Meccanica ◽  
2013 ◽  
Vol 49 (3) ◽  
pp. 615-644 ◽  
Author(s):  
Benedetto Allotta ◽  
Roberto Conti ◽  
Enrico Meli ◽  
Luca Pugi ◽  
Alessandro Ridolfi
Keyword(s):  
Robustness Analysis ◽  
Full Scale ◽  
Hardware In The Loop ◽  
Roller Rig ◽  
Traction Testing

Shock and Sine Response of Rigid Structures on Nonlinear Mounts

1991 ◽  
Author(s):  
R. Dufour ◽  
J. Der Hagopian ◽  
M. Pompei ◽  
C. Garnier
Keyword(s):  
Numerical Simulation ◽  
Power Spectrum ◽  
Dynamic Behavior ◽  
Dynamic Environment ◽  
Rigid Bodies ◽  
Nonlinear Parameters ◽  
Large Power ◽  
Passive Damper ◽  
Highly Nonlinear

Abstract The dynamic environment of embarqued structures such as radars or more generally electronic equipments consists of impacts, sine and large power spectrum excitations. Under these real conditions and amongst different kinds of isolation, the passive damper with nonlinear parameters can provide good performances. This paper is concerned with the dynamic behavior of rigid bodies on highly nonlinear mounts. The numerical simulation and the experiment carried out, show that the load-deflection behavior of the dampers have to be slightly ajusted with respect to impact vibrations to obtain a well designed behavior.

Various Types of Coexisting Attractors in a New 4D Autonomous Chaotic System

2017 ◽  
Vol 27 (09) ◽  
pp. 1750142 ◽  
Author(s):  
Qiang Lai ◽  
Akif Akgul ◽  
Xiao-Wen Zhao ◽  
Huiqin Pei
Keyword(s):  
Numerical Simulation ◽  
Dynamic Behavior ◽  
Chaotic System ◽  
Limit Cycles ◽  
Electronic Circuit ◽  
Strange Attractors ◽  
Bifurcation Diagrams ◽  
Coexisting Attractors ◽  
Signum Function ◽  
Multiple Coexisting Attractors

An unique 4D autonomous chaotic system with signum function term is proposed in this paper. The system has four unstable equilibria and various types of coexisting attractors appear. Four-wing and four-scroll strange attractors are observed in the system and they will be broken into two coexisting butterfly attractors and two coexisting double-scroll attractors with the variation of the parameters. Numerical simulation shows that the system has various types of multiple coexisting attractors including two butterfly attractors with four limit cycles, two double-scroll attractors with a limit cycle, four single-scroll strange attractors, four limit cycles with regard to different parameters and initial values. The coexistence of the attractors is determined by the bifurcation diagrams. The chaotic and hyperchaotic properties of the attractors are verified by the Lyapunov exponents. Moreover, we present an electronic circuit to experimentally realize the dynamic behavior of the system.

scholarly journals LabVIEW Interface for Controlling a Test Bench for Photovoltaic Modules and Extraction of Various Parameters

2015 ◽  
Vol 6 (3) ◽  
pp. 498 ◽  
Author(s):  
Abderrezak Guenounou ◽  
Ali Malek ◽  
Michel Aillerie ◽  
Achour Mahrane
Keyword(s):  
Numerical Simulation ◽  
Mathematical Models ◽  
Energy Production ◽  
Test Bench ◽  
Graphical Interface ◽  
Detailed Report ◽  
Photovoltaic Modules ◽  
Pv Modules ◽  
Computer Controlled ◽  
Physical Phenomena

Numerical simulation using mathematical models that take into account physical phenomena governing the operation of solar cells is a powerful tool to predict the energy production of photovoltaic modules prior to installation in a given site. These models require some parameters that manufacturers do not generally give. In addition, the availability of a tool for the control and the monitoring of performances of PV modules is of great importance for researchers, manufacturers and distributors of PV solutions. In this paper, a test and characterization protocol of PV modules is presented. It consists of an outdoor computer controlled test bench using a LabVIEW graphical interface. In addition to the measuring of the IV characteristics, it provides all the parameters of PV modules with the possibility to display and print a detailed report for each test. After the presentation of the test bench and the developed graphical interface, the obtained results based on an experimental example are presented.

scholarly journals An Experimental Analysis of Different Cane Juice Centrifugation in the Sugar Industries

2016 ◽  
pp. 01-06
Author(s):  
Prof. Vaishali Sarangpure
Keyword(s):  
Experimental Analysis ◽  
Full Scale ◽  
Feed Stream ◽  
Cane Juice ◽  
Mechanical Separation ◽  
High Consistency ◽  
Important Activity

Centrifugation is one of the key unit undertakings in the sugar business. Usually it is used ensuing to thickening of the stick juice, for instance at a high consistency region. The makers are of the view that a sedimentation hub will have the most sensible. The structure features of centrifugals from cluster to steady sorts have been thinks broadly, their operational limits have in like manner been discussed with helpful application by a couple of workers. Beside centrifugation, the mechanical separation in like manner expect an important activity for removing corruptions obtain a comparably sterilized thing, Screening is furthermore a technique used in various structures in the sugar business. The speed keeps up could be around 8000 rpm in the extent of 70-75% mud soddenness. The material vehicle in such a hub can catch suspension particles. The size extent of 1-2µm. It can have a wide extent of feed stream, which can be evaluated dependent on a full-scale. All of these concentrations as discussed for a significant determination of centrifugation of stick juice in the sugar business.

Numerical Simulation and Experimental Analysis of Photonic Band Gap in Hollow-Core Photonic Crystal Fibres

2008 ◽  
Vol 25 (5) ◽  
pp. 1541-1544 ◽  
Author(s):  
Yuan Jin-Hui ◽  
Hou Lan-Tian ◽  
Zhou Gui-Yao ◽  
Wei Dong-Bin ◽  
Chen Chao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Photonic Crystal ◽  
Band Gap ◽  
Experimental Analysis ◽  
Photonic Band Gap ◽  
Hollow Core ◽  
Photonic Crystal Fibres ◽  
Photonic Band
Sign in / Sign up

Export Citation Format

Share Document