Next Article in Journal
Evaluation of the Effectiveness of a Gaze-Based Training Intervention on Latent Hazard Anticipation Skills for Young Drivers: A Driving Simulator Study
Previous Article in Journal
Preventing Tire Blowout Accidents: A Perspective on Factors Affecting Drivers’ Intention to Adopt Tire Pressure Monitoring System
Previous Article in Special Issue
Analysis of Passenger Incident Data from Five Rail Transit Systems
Article Menu

Export Article

Open AccessArticle
Safety 2018, 4(2), 17; https://doi.org/10.3390/safety4020017

A Weibull Approach for Enabling Safety-Oriented Decision-Making for Electronic Railway Signaling Systems

1
Ansaldo STS France, 91940 Les Ulis, France
2
IFSTTAR/COSYS/GRETTIA, University Paris Est, 77420 Champs-sur-Marne, France
3
Ansaldo STS Italy, 80147 Naples, Italy
*
Authors to whom correspondence should be addressed.
Received: 19 April 2017 / Revised: 24 March 2018 / Accepted: 5 April 2018 / Published: 16 April 2018
(This article belongs to the Special Issue Safe Mobility of Rail Vehicles)
Full-Text   |   PDF [3117 KB, uploaded 3 May 2018]   |  

Abstract

This paper presents the advantages of using Weibull distributions, within the context of railway signaling systems, for enabling safety-oriented decision-making. Failure rates are used to statistically model the basic event of fault-tree analysis, and their value sizes the maximum allowable latency of failures to fulfill the safety target for which the system has been designed. Relying on field-return failure data, Weibull parameters have been calculated for an existing electronic signaling system and a comparison with existing predictive reliability data, based on exponential distribution, is provided. Results are discussed in order to drive considerations on the respect of quantitative targets and on the impact that a wrong hypothesis might have on the choice of a given architecture. Despite the huge amount of information gathered through the after-sales logbook used to build reliability distribution, several key elements for reliable estimation of failure rate values are still missing. This might affect the uncertainty of reliability parameters and the effort required to collect all the information. We then present how to intervene when operational failure rates present higher values compared to the theoretical approach: increasing the redundancies of the system or performing preventive maintenance tasks. Possible consequences of unjustified adoption of constant failure rate are presented. Some recommendations are also shared in order to build reliability-oriented logbooks and avoid data censoring phenomena by enhancing the functions of the electronic boards composing the system. View Full-Text
Keywords: safety modeling; maintenance modeling; reliability analysis; railway signaling systems; Weibull distribution safety modeling; maintenance modeling; reliability analysis; railway signaling systems; Weibull distribution
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Pascale, E.; Bouillaut, L.; Freneaux, T.; Sista, R.; Sannino, P.; Marmo, P. A Weibull Approach for Enabling Safety-Oriented Decision-Making for Electronic Railway Signaling Systems. Safety 2018, 4, 17.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Safety EISSN 2313-576X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top