RESEARCH ARTICLE
Modelling of Friction Coefficient for Shoes Type LL By Means of Polynomial Fitting
L. Cantone1, *, A. Ottati2
Article Information
Identifiers and Pagination:
Year: 2018Volume: 12
First Page: 114
Last Page: 127
Publisher ID: TOTJ-12-114
DOI: 10.2174/18744478018120100114
Article History:
Received Date: 28/1/2018Revision Received Date: 28/02/2018
Acceptance Date: 10/3/2018
Electronic publication date: 26/03/2018
Collection year: 2018
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Abstract
Introduction:
The paper describes the automatic procedure, implemented in UIC software TrainDy, for the simulation of friction coefficient of new LL shoes, used to avoid noise from freight traffic.
Method:
This procedure uses certified experimental data obtained at dynamometer bench as input data and computes a series of polynomials laws that describe the evolution of friction coefficient with speed, for different values of normal force between brake blocks and wheel and for different initial braking speeds.
Result:
Numerical results are compared against two series of experimental slip tests, carried on Trenitalia freight wagons, in terms of both stopping distances (for different starting speeds and loading conditions) and pressure in brake cylinder, speed and acceleration. Errors in terms of stopping distance are always below 5% whereas errors in terms of maximum acceleration are up to 20%.