Consolidation of Requirements for Railway Mobile Access Router System and Conceptualisation of Data Usage for Preventive Maintenance

Abstract: This thesis has been carried out at a technology company outside of Stockholm, Sweden. The study has two major purposes: (1) to investigate how thesafety aspect and railway standards aect the development of a data gatheringunit for railway applications and (2) to demonstrate how reliabilitydepend on maintenance and how gathering data could improve the maintenanceplanning and reliability of a train. Thework is divided in three dierentparts.Frame of reference, an initial study of relevant work including areas suchas standards and regulations, designing software for safety-critical systems,proactive maintenance and an insight of the prototype system built by theconsultant rm.Identication of requirements for the data gathering unit, this part coverrelevant standards and regulations, general system concept and risk analysis.Dynamic eects of train maintenance with focus on reliability. Subjectsdiscussed in this chapter are proactive and preventive maintenance, perfectand imperfect preventive maintenance and its eects on system reliability.The results suggest that the gathering unit should not be seen as a safetycritical system, still railway standards and regulations must be followed duringthe development process of such a product. It is also established that itcan be concluded that reliability depends on the maintenance interval and thecomponents characteristic wear parameters. Gathering data enable higheraccuracy of wear parameters and makes maintenance decisions more reliableand cost eective.