Stanovení spolehlivostních charakteristik nové generace modulu automatického vedení vlaku

Abstract

System of automatic train operation (ATO) is used for a self-operated control of power railway vehicles and it replaces number of functions which are realized by an engine driver. For assurance of a safe railway transport operation it is necessary to guarantee the high level of this system dependability. This dissertation thesis is concerned with the dependability analysis problems of UniAVV module which represents the central part of automatic train operation system. Dependability evaluation is realized pursuant to functional safety principles that characterize demanded level of a safety related system dependability using safety integrity level (SIL) parameter. Dissertation thesis is composed of theoretical and experimental part and it is divided into eight chapters. The first chapter of theoretical part is devoted to description of automatic train operation functions and technical solution of UniAVV module and its connections to the safety system ETCS. In next chapters there are introduced basic principles of functional safety of electronic safety related systems and theory of operational and accelerated dependability testing is mentioned. Experimental part is devoted to determination and verification of inherent dependability value of UniAVV module. There are realized qualitative failure mode and effect analysis and qualitative risk evaluation of UniAVV module. On the basis of these analyses there are determined measurements for risk reduction to tolerable level according to functional safety principles. The theoretical reliability model is created as a result of quantitative dependability assessment of UniAVV module. This model is used for calculation of functional safety parameters which are utilized for proof of achieved safety integrity level. The programme of dependability testing is designed for verification of achieved inherent dependability level of UniAVV module. The software is created for evaluation of dependability testing in the different realization modes.