Brakes of rail vehicles

• Rail Vehicles, Semester 2, position 3

1. Introducing the brake system of railway vehicles. 2. Acquiring the knowledge necessary to understand the functioning of rail vehicle brake system components. 3. Training for the application of knowledge in the design, development, repair and maintenance of the brakes.

After completion of the course the student should be able to: 1. Explain the functional and design characteristics of various types of brakes. 2. Explain the tasks and functioning mode of brake system assemblies. 3. Identify actions required to be aplied in case of malfunctions of the break system during operation and maintenance. 4. Apply appropriate regulations and standards for design and maintenance of rail vehicle brakes.

The general braking conditions. Friction and friction materials. The main types of brakes and braking techniques. The transfer of the braking action by means of the compressed air. The main braking conditions. Transmission speed, transmission time, braking time and release time. The process of braking. Braking, brake weight, weight at changeover. The stopping distance and stopping time. Braking tables. Adjusting the brake force to the load. Thermal and other restrictions of the braking force. Emergency brake. Handbrake. Electromagnetic rail brakes. UIC regulations relating to the brakes of railway vehicles. Braking modes RIC, R, S, SS ... The calculation of the brakes for passenger and freight cars. Formation and tansmission of the braking force: compressor with accessories, the main pipe, tanks, distributor, brake cylinder, mechanical transmission, slack adjuster. Executive parts: brake holders, brake shoes, discs, calipers, brake pads, other accessories. Testing of brakes: type and serial tests of the brakes and brake equipment. Experimental determination of the braking power.

Clasification of the brakes. Functional scheme of basic types of brakes. Functional scheme of pneumatic brakes. The working principle of control valve. The working principle of the distributor valve. Brake system schemes for typical rail vehicles. Gear ratio and the coefficient of efficiency. The design of the brake with brake shoes. Braking parameters selection based on regulations. The design of disc brakes. Visit the workshop for the brake maintenance. Braking tables. Examples of calculation. Examples of braking mass determination based on the brake stopping distance tests. Calculation of brake mass. Calculation of the handbrake. The design of the braking force transmission elements. The design of magnetic rail brakes, parking brake, emergency brake. Brakes for high-speed trains.

It is recommended previously to pass course Railway vehicles 1.

For tasks realization shall be used the appropriate regulations and standards.

Total assigned hours: 75

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

Auditory exercises: 14
Laboratory exercises: 4
Calculation tasks: 7
Seminar paper: 0
Project: 0
Consultations: 0
Discussion/workshop: 5
Research study work: 0

Review and grading of calculation tasks: 7
Review and grading of lab reports: 3
Review and grading of seminar papers: 0
Review and grading of the project: 0
Test: 0
Test: 0
Final exam: 5

Activity during lectures: 0
Test/test: 20
Laboratory practice: 10
Calculation tasks: 30
Seminar paper: 0
Project: 0
Final exam: 40
Requirement for taking the exam (required number of points): 30

Simic, G., Milkovic, D., Radulovic, S., Brakes of railway vehicles, Faculty of Mechanical Engineering, Belgrade, 2022., ISBN: 978-86-6060-125-6; Milovanovic, M., Lisanin, R., Vuksic-Popovic...Brakes and braking of rail vehicles - basis for design, selection and maintenance, Faculty of Mechanical Engineering, Belgrade 2007., ISBN: 86-7083-584-3; Milovanovic, M., Lisanin, R., Brakes and braking of rail vehicles, Faculty of Mechanical Engineering, Belgrade 2000., ISBN: 86-783-373-5