• Rail Vehicles, Semester 1, position 1

1. Understanding of different constructions of the freight wagons and passenger coaches 2. Acquiring the knowledge necessary to understand the functioning of wagon or coach assemblies 3. Application of knowledge in the design, development, repair and maintenance of wagons and coaches

After completion of the course the student should be able to: 1. Explain the functional and structural characteristics of various types of rolling stock. 2. Explain the tasks and functioning principles of the assemblies of the rail vehicles. 3. Identify actions required to resolve failures in operation and maintenance of rail vehicles. 4. Apply appropriate regulations and standards for design and maintenance of railway vehicles. 5. Applicate computer tools for calculating and designing rail vehicles.

General fundaments for designing rail vehicles. Main assemblies of the rail vehicles. The structural parameters of the vehicle. Standards and regulations in the design, operation and maintenance of rail vehicles. Wheelsets. Axle bearings. Single axis running gear. Typical bogies for wagons. Bogies for passenger coaches. Bogie breakaway torque. Running gear with independent wheels. Calculation of the rail vehicles gauge. Flexibility coefficient. Checking the relative position between the running gear and the carbody. General overview of the loads acting on the structure of the wagon. Unbalanced lateral acceleration. Calculation of the rail vehicle rollover safety. Calculation loads for axle strength check. Design of the carbody bearing structure. Materials for the bearing structure. Regulations for design loads and allowable stresses for carbody and for bogie frame. Strength calculation. Strength test. Passive safety measures for the crash scenario.

Division of rail vehicles. Selection of basic parameters and their constraints. The examples and analysis of excerpts from the regulations. Characteristic wheel profile measurements. Pressed-on or shrunk-on fitting of wheelsets and shrunk-on fitting of the wheel tyres on the wheel centers. Examples of axle bearing assemblies. Design of typical freight wagon bogies. Design of passenger coach bogies. Vehicle gauge calculation. Calculation of relative position between running gear and the carbody. Determination of the general vehicle loads. Calculation of the carbody bearing structure. Checking the stability of the bearing elements of the structure. Fundamentals of stress measuring techniques. Procedure for strength testing of the carbody.

Previously finished equivalent of at least: 12 ECTS in Mechanics of rigid bodies, 6 ECTS in Mechanic of deformable bodies and 6 ECTS Machine elements.

G. Simic, Instructions for writing student papers, hand-out For preparation tasks as a basis should be used the appropriate regulations and standards

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 11
Laboratory exercises: 0
Calculation tasks: 0
Seminar paper: 6
Project: 8
Consultations: 0
Discussion/workshop: 5
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 0
Review and grading of seminar papers: 1
Review and grading of the project: 5
Test: 4
Test: 0
Final exam: 5

Activity during lectures: 0
Test/test: 30
Laboratory practice: 0
Calculation tasks: 0
Seminar paper: 5
Project: 30
Final exam: 35
Requirement for taking the exam (required number of points): 40

Simic, G., Rail vehicles- Constructions and calculations, Faculty of Mechanical Engineering, Belgrade, 2013., ISBN: 978-86-7083-809-3