In most cases, dynamic characteristics determine the wagon maintenance cycle, traffic safety, reliability and durability performance. The main indicators include vertical Kvd horizontal Khd coefficients as well stability coefficient Ks, which determines wheel flange resistance to derailment. article compares indications for three different types of bogies. There were no tangible differences observed all bogies running at a speed 40 120 km/h on direct tangent rail section. Nevertheless, there...

The simplified method to determine a vertical impact force of wheel with flat and rail interaction is presented in this article. can be used identify maximum contact its distribution the length between damaged rail. depends on geometrical parameters flat, speed vehicle angle deviation This article demonstrates influence parameters, zone. obtained values for determination are compared results from field measurements.

A complete study is presented on the response of thermoplastic and composite materials for bearing cages bogie trains rail applications to aging conditions in presence lubricants. Glass Fiber reinforced Polyamaide 66 (GF PA66) proposed as commercial material already used field while Polyether Ether Ketone (PEEK) novel polymeric candidate due its chemical stability high mechanical performance. Accelerated tests were performed analyze these external agents under different conditions....

Railway infrastructure must meet safety requirements concerning its construction and operation. Track geometry monitoring is one of the most important activities in maintaining steady technical conditions rail infrastructure. Commonly, it performed using complex measurement equipment installed on track-recording coaches. Existing low-cost inertial sensor-based systems provide reliable measurements track vertical directions. However, solutions are needed for parameter lateral direction. In...

This paper describes the analysis of vertical dynamics passenger car motion considering forces wheel/rail interaction. The aim this study is assessment smoothness running while one wheel with a flat. mathematical models flat impact on rail and entire dynamic are defined. In order to evaluate vehicle movement by computer simulation means software package Simpack was used. case, wheel-flat modelled deviation rolling radius. On base theoretical analysis, accelerations tangent track were...

The article discusses the problem of railway safety management and criteria for evaluating traffic risk described in various scientific publications. research aims to assess posed infrastructure objects create a model evaluation. on with respect rail transport system was divided into three stages. Plan–Do–Check–Act (PDCA) can be used investigating managing risks Lithuanian railways. main threats are defined, catalogue technical parameters level crossings railways is presented. maximum...

The authors of this paper analyze the freight wagon wheel rolling surface damage detection process in Lithuanian Railways. wagons were selected for study consideration Wheel Impact Load Detector (WILD) database. results gained by experimental measurements defects compared with data recorded WILD. Distribution failures types and dependence influence wheel-set location a on occurrence different wheels was defined. examined reliability WILD read-outs defect dynamic coefficient value. Finally,...

One of the main tasks approached by European Union is liberalisation railway transport service market. The foremost problem solved in this paper interoperability various systems countries Union. Thus, immediate goal to solve different used A distinction between track gauges (from 1435 1668 mm), particular couples wagons, clearances rolling stock, infrastructure etc. are impediments. problems nearest future will be evaluation brakes wagons produced Western Europe and former Soviet Freight...

Summary. Breakdown of rolling stock axle-boxes if not detected in due time may cause a rail accident or disaster. At present, lot advanced technologies, modern equipment and devices, which “recognizes” faulty when the train is motion, have been implemented. However, timely identification breakdown still an acute problem, initial stage damage emergence being especially problematic. Presently, axle-box determined according to higher than permissible temperature body. The article provides...

An improved method for spectral analysis of traction current an Alternating Current (AC) electric locomotive is considered in the article. A new considers change voltage catenary system as a non-deterministic, non-ergodic and non-Gaussian process. It has been established that higher harmonics have significant negative effect on operation non-traction railway consumers electricity. In addition, locomotives operating same feeder zone mutual influence each other. Electric transport source...

The condition of the wheelset a running train is controlled by trackside automated control equipment (TACE), which measures parameters wheel/rail contact and signals about possible damages in wheels. Calculation strength lifetime gear roadbed rail track should be based on values wheel vertical impact rail. major problem using TACE low reliability measured interaction force repeatability readings. This occurs because completely stochastic phenomenon. It necessary to indirect indicators...

The article observes problems of detection rolling bearing damages in rail vehicles. Two methods damage are examined – according to heating axleboxes and by vibro-diagnostic manner. disadvantage method is that a contact vibration sensor used for diagnostics, intervention into vehicle structure required. axle-boxes also has drawbacks. same temperature value axle-box various conditions may characterize different technical state. Authors studied possibility use change intensity parameters as...

The determination problem of adhesion coefficient locomotives’ wheels with rails is described in this paper. use methods mathematical statistics and theory probability provides wider possibilities for determining the most acceptable (suitable) value coefficient. random factors influencing on are analysed. values based reliable research results could help maintain uninterrupted (continuous) traffic heavy freight trains increase not only carrying capacity, but also volume transported goods....

The article overviews scientific research studies that examine the interaction between railway vehicle wheel and rail, phenomena of wear on rolling surface. Unique experimental has been conducted, in which regularity weariness surface exploitable locomotive metal fatigue were researched. A hypothesis is made, according to differences intensity it possible determine start fatigue. inequality different wheels assessed by Sharpe ratio, adapting describe criteria. Based results research, authors...

The repeatability of rail wheel damage measurements is considered in this study. authors investigated the measurement vertical force dependence on wheel-rolling surface nature and suggested ways to reach higher repeatability. To investigate impact repeatability, results measuring forces with different systems were compared first. Another critical issue was estimating deviation field for measured values. box whisker principles used. Different types (shapes) damages rolling stock operating...

The analysis of bus air spring condiTion influence upon vibraTion signals aT frame analiza wpływu sTanu Technicznego resora pneumaTycznego auTobusu na sygnały drgań w ramie paper analyses the spread vibration intensity through mechanical structure.The research has been completed application theory covariance functions.Results measuring vibrations at fixed framepoints were recorded on time scale in form data arrays (matrixes).The authors have estimation functions by between digital results...