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Railway transportation is currently the main tools of transport in china, playing a key role in economic and social development. With the rapid development of china's economy, the timeliness of railway transportation has been unable to meet the growing demand. Thus, development of high-speed and heavy technology has become an inevitable trend, and railway vehicle and track technology made further...
Rolling stock wheels eventually show, soon or later, geometry defects, cracks, fatigue, flaking, wear, etc. These defects induce an additional stress in both, wheels and rail tracks which in turn tend to decrease the infrastructure life time. This paper presents an on-line monitoring system installed at Estarreja (Portugal north rail track network) able to detect the approximation to the measure zone,...
One of the most important issue in the railway research is represented by the accurate estimation of the axle loads of railway vehicles. Weigh in Motion (WIM) devices are designed to measure loads with the vehicle in motion, making the weighing process more efficient.
This paper presents the responses of the vehicle and track components in terms of vertical forces and displacements. The considered vehicle model is a 10-DOF multi-rigid-body system supported on a track systems that consider three layers of structure. The car body is linked with the bogie through the secondary suspension system contained spring and damper elements. In the model of track, the rail...
The paper deals with the control methods for routing optimization of bogie in rail track (i.e. rail channel) with the usage of GPS. Consequently the GPS information is used for determining of position and the curve radius track. These parameters are necessary for the tested control methods. For this research stage the experimental rail vehicle powered by the traction battery is also utilized. This...
This paper compares different models and simulation approaches for an energetic simulation of an automatic subway. For this purpose, several models are carried out from a dynamic model, which is validated by comparison with experimental measurements. Furthermore, two different simulation approaches are compared, i.e., backward and forward approaches. A simplified model is obtained and allows the reduction...
The paper deals with development stage of the suitable conception of traction drive including the structure of control design for the experimental rail vehicle with independent rotating wheels driven by permanent magnet synchronous motors (PMSMs). The research including the design and the construction of this experimental vehicle is very extensive and complex. The whole vehicle system is supplied...
Some simulation testing systems are on operation for express train system in Korea. These full scale systems simulate the behavior of wheel/rail at real speed up to 320km/h and made by KNR systems Inc. In this paper, the only derailment simulation system in Korea is introduced.
Base on an improved three-dimensional wheel-rail contact trace algorithm and a new model of wheel-rail contact force, dynamical model of China Railway High-speed(CRH) vehicle is established, which can quick get wheel-rail contact point and contact force and accurately predict vehicle dynamic behavior. Then, a new vehicle dynamic simulation system is developed in MATLAB, called dynamic derailment system...
In this paper a method is proposed for sharing the torques equally between the wheels of a gantry crane, driven by V/F controller, under wheel slippage. Induction Machines (IM's) are used for driving the wheels of the gantry crane. These motors are controlled by Volts/Hertz controller. Over time the adhesion between the wheels and the rails decreases because of wear-out. Water or oil spillage, etc...
The subject of this paper is a theoretical analysis of Wheel Slide Protection (WSP) controllers for rail vehicles. First of all a principle of operation of WSP systems has been described and problems concerning designing WSP controllers have been specified. Then structure of a WSP controller compared to a classic control diagram is presented. Various types of WSP controllers are compared and their...
In order to investigate the change of time-frequency characteristics of vehicle/track/bridge coupling system caused by wheel tread reprofiling, a coupling model of vehicle/track/bridge system is developed, the empirical mode decomposition (EMD) and Hilbert-Huang Transformation (HHT) are introduced to the analysis of vibration signal. Based on the theory of vehicle/track/-bridge coupling dynamics,...
This paper presents 3D finite element model construction, modal analysis and lateral dynamic response of the low truss bridge instead of vehicle-bridge interaction model. We change general vehicle-bridge interaction model into low truss bridge model applied on lateral dynamic loads from running vehicles. Specifically, the determination of two different transverse dynamic loadings on the railways is...
In order to predict the interior noises of subway cab caused by track irregularities, the vehicle-track coupling dynamics analysis was applied to compute the excited loads, which play a role as the cab noise sources. The acoustical boundary element method was employed to estimate interior cab noise, and the distribution characters of the interior cab noise were ascertained and reached the following...
The diversity of railway gauge is caused by historical reasons, and its shortcomings have been exposed to Modern railway transportation. At present, the solutions to Logistics and transport issues between different gauge railways are mainly to change transport equipment. And different ways to replace Bogie will affect the size of the frontier transshipping station, operating efficiency and investment...
The railway braking system is a complex pneumatic plant whose performance and reliability are related to safety, because of the uncertainly of adhesion coefficient between rail and wheelset. The wheelset may slide while revolving, especially at high speed. Therefore anti-sliding control system is necessary and useful to protect wheel. The problem is how to find the suitable parameter of anti-sliding...
In this paper a method of designing the rule bases of fuzzy controllers for Wheel Slide Protection Systems (WSP) for rail vehicles is presented. In this method results of simulation of two reference controllers are used, both of which use signals which are nor available during normal operation of the systems, i.e. adhesion coefficient and translation velocity of the vehicle. Simulations have performed...
Irregularity of the fixed frog affects the passage velocity and the comfort of urban railway vehicles. To reveal this irregularity, based on the Finite Element Method (FEM) computational models were set up. The models included the contact between the worn tread wheel of Dalian tram and the 50kg/m rail as well as the different sections of No. 9 fixed frog. The results were used to find the laws of...
The sources of urban traffic noise, as well as causes of various noises were introduced. Control measures of urban traffic noise were proposed. According to the mechanism of the noise, control the noises of road traffic and rail traffic from the following respective aspects, running vehicles, road pavement, surrounding environment, national laws and regulations etc. It is possible to provide references...
The paper presented is dedicated to developing a simulation model of an electronic system for measuring the load of railway vehicle wheels at an operational speed. The aim is to define the possibility to develop an electronic system for determining the value of force applied to the rail by the wheel on the base of the under-rail fundament reaction. The metrological qualities of the system defined...
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