Appendix a effect of wheel rail profiles and wheel rail interaction on system performance and maintenance in transit operations unfortunately, this book cant be printed from the openbook. Mechatronic modeling of realtime wheelrail contact trid. Please let me know if the approach i have followed is correct. Reasonable solution method would reduce the computational effort and improve the solution efficiency in a certain extent. Matlab simulink models track wheel rail contact vehicle simulation visualisation mfile library modulus model mfile mfile topology of the rail vehicle track mechanical system figure 1. When there is no contact, the wheel rises above the rail. Wheel rail contact calculator in matlab the following matlab project contains the source code and matlab examples used for wheel rail contact calculator. Considerable benefits can be gained through appropriate wheel rail interface management, including reduced defect rates, improved safety, extended wheel and rail life, improved vehicletrack interaction, reduced wheel rail noise and the development of suitable standards and maintenance procedures. The source code and files included in this project are listed in the.
Meehan1,2 1school of mechanical and mining engineering, the university of queensland, australia. The scenario used to test the developed model was to have the car park, in an empty parking space. Simulation of rail wear on the swedish light rail line tvarbanan. This book focuses on the development of a realtime wheel rail contact model by the railway technology lab of the department of mechanical and aerospace engineering at politecnico di torinopolytechnic university of turin. Simulation of rail wear on the swedish light rail line. Appendix a effect of wheelrail profiles and wheelrail. Application examples illustrate the influence of locomotive tractive effort on the forces between wheel and rail. This gui program might be able to calculate the contact size and contact pressure on the contact patch by hertz theory.
By bob tuzik for three years running, new york city transit and the federal transit administration have kicked off the annual wheel rail interaction rail transit conference with discussion of the nyctfta research project to explore integrated wheel rail analytics on mtanycts no. Experimental and numerical modelling of wheelrail contact. Modelling and simulation of vehicle kinematics and dynamics. The wheel rail contact has been of crucial interest to the railway engineers. Wheelrail friction depends on the shear properties composition of the third body layer. A good bus suspension system should have satisfactory road holding ability, while still providing comfort when riding over bumps and holes in the road. Variation of contact points and contact area are analyzed.
A steel wheel requires very little energy to roll on a steel rail. Wheel rail wear and surface fatigue depend greatly on the contact stress. Of these libraries, only the matlab version provides full transient calculations for corrugation studies and the extended contact features. Railway technology today 3 edited by kanji wako railway. Third body at wheelrail contact third body is made up of iron oxides, sands, wet paste, leaves etc.
Wheel rail interface monash institute of railway technology. Conventionally, the horizontal force exchanged between rail and wheel is expressed as the product of the vertical force acting on the wheel and the socalled adhesion coefficient. Applications of chaos and nonlinear dynamics in engineering. Good afternoon, could you please send me an example of a manual or guide. The geometric or kinematical relations of the wheel rail contact and the contact mechanical relations for the calculation of the contact forces are to be dealt with very careful attention. And under the conditions of a same curve section, simulations are made on the contact position of groove rail and standard rail. The multibody simulation of railway dynamics needs a reliable and efficient method to properly describe the contact between wheel and rail. Stecco, university of florence, italy abstract the numerical simulation of system dynamics is today a standard in the design. To do this for new profiles, drawings may be available but, after running for a little while, profiles will deviate significantly from the design case and it is essential to have accurate geometrical information of the worn profiles. Good afternoon, could you please send me an example of a manual or guide please. The importance of wheelrail interface on energy savings. Mechatronic modeling of realtime wheel rail contact. Modelling the contact between wheel and rail within.
Conventionally, the horizontal force exchanged between rail and wheel is expressed as the product of the vertical force. The program also calculates normal force versus creepage comparing both johnson and vermeulen theory and kalkers theory. The wheelrail contact is at the core of all research related to vehicle track interaction. For numeric simulation, the transient wheelrail rolling contact in railway system is a very complex and timeconsuming process. A tool to estimate the wheel rail contact and temperature rising under dry, wet and oily conditions abstract in this paper, finite element method fem has been applied to evaluate the wheel rail contact. Wheel rail profiles and vehicle steering behavior are such that the curve can be considered mild the contact area at each wheel tread low rail interface is approximately circular. Nov 10, 2011 dynamic simulation of a railway vehicle negotiating a tight curve, using an elastic multipoint wheel rail contact algorithm, in 3d. Multibody analyses are, for example, used for the evaluation of the running. Third body separates wheel and rail surface, accommodates velocity differences and determines wheelrail friction. Interface journal the journal of wheelrail interaction.
Matlab simulink and dspace as a rapid control prototyper. The weight of the vehicle is translated through normal forces. This includes many improvements to the new wheel rail contact module, and has many options added to the free version. The forces and moments, which occur in the wheel rail contact regions, have a dominant effect on the vehicle dynamics. The following matlab project contains the source code and matlab examples used for applications of chaos and nonlinear dynamics in engineering vol.
Using hertzs theory, this gui provides longitudinal and lateral length of contact shape, and normal pressure with maximum normal pressure of the contact ellipse. Hertzs contact ellipse between rail and wheel matlab. Wheel rail friction depends on the shear properties. Pdf determination of wheelrail contact characteristics by. Modelling and simulation of train brake system in low adhesion. Wheelrail elastic contact simulation in curve youtube.
A vehicle rail dynamic model is established and the calculated results are verified with trace method. Python determines the type of the reference automatically based on the data object assigned to it. Hence, the wheelrail rolling contact has been a hot issue. The importance of wheelrail interface management on energy savings and sustainability railroad wheels and rails are made of high strength steel. Apr 30, 2017 grid connected moving loads, to assess the impact of rail electrification on grid response. Dynamics analysis of wheel rail contact using fea sunil kumar sharmaa, anil kumarb acentre for transportation systems, iit roorkee, uttarakhand, 247667 india. Simulation analysis on wheel and groove rail contact position. The multibody simulation of railway vehicle dynamics needs a reliable and efficient method to evaluate the contact points between wheel and rail, because their positions have a considerable influence on the direction and intensity of the contact forces. Aug 31, 2017 this gui program might be able to calculate the contact size and contact pressure on the contact patch by hertz theory. For example, the wsp module, mechanical behaviour of wheelsets and the influence of.
Wheel rail contact calculator file exchange matlab central. Binding a variable in python means setting a name to hold a reference to some object. The likelihood of railway wheel wear occurring is rising, this is as a result of new specifications imposed on railway wheels that are leading to an increase in the severity of the wheel rail contact conditions it is important that the wheel wear process can be modelled, as this enables improvements to be made to wheel design and materials in order to keep wear at a minimum. Fuzzy logic creep control for a 2d locomotive dynamic model under transient wheelrail contact conditions y. All values between color data min and color data max map linearly to the intermediate colors of the colormap. Safety and economy of railway traffic is enormously influenced by the contact stress variation caused by wheel rail contact profile changes.
Pdf the wheelrail contact problem in vehicle dynamic. Modeling of energy processes in wheelrail contacts operating. Performance analysis of wheel and rail contact by nature of material characteristics a contact mechanics approach v. This idealised lift and hit phenomenon is shown in fig.
Friction in wheel rail contacts universiteit twente. The blocks use the axle velocity and torque, tire parameters, and normal forces to calculate the wheel dynamics and forces acting on the vehicle axle. Fuzzy logic creep control for a 2d locomotive dynamic. To study the influence of interacting wheel and rail profile topology of standard rail uic60, the standard wheel profile as per. In this work innovative methods to evaluate the position.
Grid connected moving loads, to assess the impact of rail electrification on grid response. Modelling the contact between wheel and rail within multibody. Pdf the authors in this paper describe the steps of creating a special program in gui tool in. Remote sensing of the lateral force for the scaled active. A change in designed surface topology may result from wear that brings in a wide change in contact geometry and stresses. For processing all the data, a matlab 73 script was written in such way it could. Pdf simulation of rail vehicle dynamics in matlab environment. This is a minor update that provides improvements in the wheel rail contact module and the contact library. Rail profile wear on curve and its effect on wheelrail. Without having an appropriate understanding of the wheel rail interaction, the essential safety analysis of stability and derailment or the ride comfort analysis are incomplete 2. The starting point for an analysis of wheelrail contact is the identification of the size and shape of the contact patch. Determination of wheelrail contact points in the simulation of railway vehicle dynamics j. A new approach to study the wheelrail contact problem in.
Wheel flats are flat zones on the wheel tread caused by unintentional. Modelling the contact between wheel and rail within multibody system simulation gunter schupp1, christoph weidemann2 and lutz mauer2 summary in modern railway industry the simulation of the behaviour of railway vehicles has become an important design method during the last years. Then a general presentation of the phenomena creepage and spin that arise in the contact area between wheel and rail during rolling motion is given, as well as a survey of the contact. I am very new to matlab, hidden markov model and machine learning, and am trying to classify a given sequence of signals. Also, a user can understand how contact shape changes with variation of parameters. Draft article for engineering journals modelling the contact between wheel and rail within multibody system simulation gunter schupp1, christoph weidemann2 and lutz mauer2 summary in modern railway industry the simulation of the behaviour of railway vehicles has become an important.
Graham dudgeon, meng, phd is the energy industry manager at mathworks. In the wheel rail contact, the separation between the contacting surfaces depends on a lot of variables as. Modern simulation packages offer modelling elements that are highly. The contact model between wheel and rail is approximated to be elliptical, which is shown to be accurate for the described purpose.
Control tutorials for matlab and simulink introduction. Third body at wheel rail contact third body is made up of iron oxides, sands, wet paste, leaves etc. Assignment creates references, not copies names in python do not have an intrinsic type. For the blocks, you can specify a drum, disc, or mapped brake. Applications of chaos and nonlinear dynamics in engineering vol.
The outcome of such operation of vehicles is an increase in vehicles effects on the track in the railwheel contact resulting in increased ride resistance, creep in. Algorithm of the package a vehicle in turn is made of a series of rigid. We will define the variables m1 and m2 in the matlab workspace, so we can just enter the corresponding. Goodall roger dixon department of electronic and electrical engineering, loughborough university, loughborough, leicestershire, le11 3tu, ukemail. Contact force estimation in the railway vehicle wheelrail. Performance analysis of wheel and rail contact by nature of. Dynamic simulation of a railway vehicle negotiating a tight curve, using an elastic multipoint wheelrail contact algorithm, in 3d. Modeling of energy processes in wheelrail contacts. The paper has carried out continued tests on a curve of a heavy haul railway in china for its rail profiles.
Generation of steering command to actuator based on the control algorithm. A tool to estimate the wheelrail contact and temperature. Wsp and sanding systems to increase adhesion in the wheelrail contact in. Railway technology today 3 edited by kanji wako railway electric power feeding systems yasu oura, yoshifumi mochinaga, and hiroki nagasawa introduction electric power technology in the railway industry refers to the means of supplying goodquality electric power to the electric motors. The stressstrain of thin multilayered coatings covered the surface of the rail is studied near the region of side contact in turning motion. Another application example presents the investigation of a complex mechatronic system of the traction control and vehicle dynamics using the cosimulation of adams rail and matlab simulink. The source code and files included in this project are listed in the project files section, please make sure whether the listed source code meet your needs there. The solid model of rail wheel contact model is created in catia v5. A new approach to study the wheel rail contact problem in railway dynamics joao pombo, jorge ambrosio idmecinstituto superior tecnico, lisbon, portugal.
Pdf a novel method to model wheelrail normal contact in. Such a flat results in loss of contact between the wheel and the rail for a short time and then regaining of contact. The geometric or kinematical relations of the wheel rail contact and the contact mechanical relations for the calculation of the contact. The wheelrail contact interaction representation plays a fundamental role in the. Modeling rail electrical systems in matlab and simulink youtube. Summary the forces and moments, which occur in the wheel rail contact regions, have a dominant effect on the vehicle dynamics. The following matlab project contains the source code and matlab examples used for wheel rail contact calculator. The vibration of rail vehicles becomes very complex because it is affected by the condition of vehicles, including suspensions and wheel profile, condition of track sections, including rail profile, rail irregularities, cant and curvature. Wheelrail interface handbook is a onestop reference for railway engineering practitioners and academic researchers. The starting point for an analysis of wheel rail contact is the identification of the size and shape of the contact patch. Influence of locomotive tractive effort on the forces. Development of flats on the wheels of railway engines and wagons is one of the major causes of track and ride quality deterioration. The contact addon to gensys is fully integrated in gensys, allowing to incorporate detailed wheel rail contact analysis in various vehicle dynamics scenarios.
Use the model and wheel blocks in the vehicle model driveline subsystem. Wheel rail interface handbook is a onestop reference for railway engineering practitioners and academic researchers. Third body separates wheel and rail surface, accommodates velocity differences and determines wheel rail friction. Based on the data, the paper has counted the development of the rail profile wear, and then analyses the influence of wheel rail contact geometry on the rail profile wear. Part one provides the fundamentals of contact mechanics, wear, fatigue and lubrication as well as stateoftheart research and emerging technologies related to the wheel rail interface and its management. In simulink, it is very straightforward to represent and then simulate a mathematical model representing a physical system. Wheel rail contact calculator in matlab download free. Modeling rail electrical systems in matlab and simulink. Contact 1,2,3, as an example of these programs, is a simulation program. Proceedings of the 18th world congress the international federation of automatic control milano italy august 28 september 2, 2011 contact force estimation in the railway vehicle wheel rail interface christopher p. Graphical user interface gui, allowing manual configuration of vehicle, train. The contact between wheel and rail is the constitutive element of railway vehicle dynamics. Matlab and simulink enable grid simulation and analysis to replicate and analyze energy transfers in different operation conditions depending on the characteristics of your voltage, current, or contact electrification system. The role of the active steering control module is followings.
The wheel rail geometry dramatically influences the rates of wheel rail wear and contact fatigue. Matlab, gui, railway, friction, contact ellipse, kalker. An innovative wheelrail contact model for multibody applications. A new solution method for wheelrail rolling contact.
The contact between the wheel of a train and the rail is a rolling contact between two bodies, the wheel and the rail, which are stiff, meaning that the deformation of the bod ies is small. Simulation of rail wear on the swedish light rail line tvarbanan 5 2 methodology this chapter first describes the proposed rail wear simulation procedure. A novel method to model wheelrail normal contact in vehicle dynamics simulation. Analysis of rail wheel contact stresses by using ansys ansys is finite element analysis software which enables engineers to perform the following tasks. Wheel rail contact calculator in matlab download free open. All values in your plot data that are less than or equal to the value of color data min map to the first color in the colormap. If you need to print pages from this book, we recommend downloading it as a pdf. Sathish gandhi department of mechanical engineering, university college of engineering nagercoil, anna university. Appendix a effect of wheelrail profiles and wheelrail interaction on system performance and maintenance in transit operations unfortunately, this book cant be printed from the openbook. The model of the vehicle chosen to work on as a general simulation model for the vehicle system was a four wheel vehicle drive model. To get the proximate approach for reality is the main object for the designer for the ride. Part one provides the fundamentals of contact mechanics, wear, fatigue and lubrication as well as stateoftheart research and emerging technologies related to the wheel rail.
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