Stasys Steišūnas

Modelling the assessment of traffic risk at level crossings of Lithuanian railways

AbstractThe article discusses the problem of railway safety management and the criteria for evaluating the traffic risk described in various scientific publications. The research aims to assess the risk posed to railway infrastructure objects and to create a model for safety risk evaluation. The research on the traffic safety risk with respect to the infrastructure of the rail transport system was divided into three stages. The Plan–Do–Check–Act (PDCA) model can be used for investigating the problem of managing railway traffic safety risks in the Lithuanian railways. The main threats to railway infrastructure objects are defined, and the catalogue of technical parameters of level crossings of the Lithuanian railways is presented. The maximum allowable train speed, the intensity of railway and road traffic, as well as the size (width) and visibility of level crossings from the train driver’s cab are chosen as the main criteria for evaluating the vulnerability of a level crossing. The logistic regression me...

Evaluation of the Influence of a Rail Vehicle Running with Wheel-flat on the Railway Track

Abstract The railway transport network is currently in a quite big expansion. Therefore, railway tracks are modernized and the attention is given also on the technical state of rail vehicles, which operate on them. However, it may happen that the wheel surface is damaged. One of the most common reasons of wheel damage is too much braking, which results to the wheel-flat formation. This article is focused on the evaluation of the influence of a rail vehicle running on the railway track, which a wheel is damaged by the wheel-flat. Investigation of these negative effects was performed by means of simulation computations. As evaluating parameters, values of the wheel force in the contact of the rail and wheel with a flat where observed.

Strength Analysis of a Steel Structure of Weights Boxes by Means of Simulation Computations

Abstract In this article the strength analyses of weights boxes are presented. Boxes are designed as a welded steel structure at which weights with total mass almost ten tons are stored in them. These boxes are an integral part of a mechanism intended for calibration of the mass measurement device. The article contains on one hand the basic scope of the theory of elasticity and strength analysis and on the other hand the numerical computations of the structure by using the Finite Element Method. Based on results the structure of weights boxes was modified in order to satisfy the defined safety factor.

Algorithm for Choosing Traction Rolling-Stock for Railway Line Rail Baltica

Santrauka. Straipsnyje nagrinėjami siuo metu AB ,,Lietuvos geležinkeliai“ kroviniams vežti naudojami traukos riedmenys, analizuojami ir lyginami jų techniniai duomenys, vertinamos jų eksploatavimo sąnaudos. Įvertinus krovinių srautų prognozes tiesiamoje ,,Rail Baltica“ geležinkelio magistralėje, pasiūlytas traukos riedmenų kroviniams vežti parinkimo algoritmas. Silumvežių panaudojimo sioje magistralėje efektyvumas nustatomas trimis daugiakriterinio įvertinimo metodais: vietų sumos metodu, rodiklių įvercio metodu ir geometrinio vidurkio metodu. Silumvežiai vertinami techniniais, ekonominiais ir ekologiniais aspektais. Keiciant kriterijų svarbos koeficientų reiksmes, nustatyti skirtingi riedmenų panaudojimo efektyvumo rezultatai.