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Hydraulic Elements and Systems

Type of study Follow-up Master
Language of instruction Czech
Code 338-0502/02
Abbreviation HyPrv
Course title Hydraulic Elements and Systems
Credits 5
Coordinating department Department of Hydromechanics and Hydraulic Equipment
Course coordinator doc. Dr. Ing. Lumír Hružík

Osnova předmětu

Contents of lectures
1. Working fluids of hydraulic systems: physical properties, chemical properties, types of working fluids and their applications.
2. Pumps – gear, vane, and screw: basic theory, construction, characteristics, applications.
3. Pumps – piston: basic theory, construction, characteristics, applications.
4. Control and regulation of the pumps geometric volume. Rotary hydraulic motors. Hydraulic power units.
5. Hydraulic cylinders and hydraulic rotary actuators: construction, characteristics, efficiency, applications. Seals in hydraulic systems. Hydraulic pressure intensifiers.
6. Check valves, controlled check valves, double-sided hydraulic lock, direct operated and pilot operated directional valves, shut-off valves: construction, characteristics, applications.
7. Flow control valves: construction, characteristics, applications.
8. Pressure control valves: construction, characteristics, applications. Logical slip-in cartridge valves.
9. Proportional directional control valves, proportional pressure control valves: construction, characteristics, applications. Servo valves.
10. Hydraulic accumulators and their application in hydraulic systems.
11. Control of hydrostatic drives: valve, volumetric. Hydrostatic transmission.
12. Hydraulic systems with two or more hydraulic motors. Synchronous operation of hydraulic motors. Hydraulic systems for handling loads.
13. Energy-saving systems. Filters and filtration. Pipes, hoses, tanks, heaters, coolers.
14. Thermal calculation of hydraulic system. Cooler design. Fundamentals of hydraulic systems dynamics.

Content of exercises and seminars
1. Repetition of hydrostatics. Pressure in liquid. Pressure losses. Flow
losses. Calculation of permeability G = 1 / R.
2. Analysis of the ideal hydraulic system in the steady-state.
3. Calculation of real hydraulic system parameters in steady-state.
4. R-resistances. Hydraulic systems with R - resistances.
Program No. 1: Calculation of simple hydraulic system parameters in steady-state. Students can earn up to 10 points for this program.
5. Calculation of parameters of hydraulic systems with throttle valves.
Program No. 2: Calculation of parameters of the multi-motor hydraulic system controlled by throttle valves. Students can earn up to 14 points for this program.
6. Thermal calculation of hydraulic system. Design and calculation of cooler parameters.
7. Acceleration and braking of the drive.
8. Stiffness of the hydraulic motor. Natural oscillations in the system.
9. Excursion to the industrial operation or testing lab.
10. Design and calculation of the hydraulic cylinder. Calculation of seal friction.
11. Design of hydraulic system with a proportional directional valve.
12. Calculation of the hydraulic system with accumulator.
13. Design and calculation of accumulator. Credit test. Students can earn up to 8 points for this test.
14. Credit.

Povinná literatura

[1] EXNER, H. et al. Hydraulics, Basic Principles and Components. Würzburg, Germany: Bosch Rexroth AG., 2011. 326 p. ISBN 978-3-9814879-3-0 .
[2] EWALD, R. et al. Proportional and Servo-valve Technology. Lohr am Main, Germany: Bosch Rexroth AG, 2003. 300 p.
[3] GÖTZ, W. Hydraulics. Theory and Application. Ditzingen: Rexroth Bosch Group + OMEGON, 1998. 291 p. ISBN 0-7680-0242-7.
[4] NOACK, S. Hydraulics in Mobile Equipment. Ditzingen: Rexroth Bosch Group + OMEGON, 2001. 202 p. ISBN 0-7680-0886-7.

Doporučená literatura

[1] IVANTYŠYN, J., IVANTYŠYNOVÁ. Hydrostatic pumps and motors: principles, design, performance, modelling, analysis, control and testing. New Delhi: Tech Books International. 2003. 512 p. ISBN 81-82305-08-1 .
[2] HEHN, H. et al. Fluid Power Troubleshooting. New York: Marcel Dekker. 1995. 647 p. ISBN 0-8247-9275-0.
[3] MANRING, N. D. Hydraulic Control Systems. John Wiley & Sons. 2005. 426 p. Online version available at: https://app.knovel.com/web/toc.v/cid:kpHCS0000E/viewerType:toc
[4] CHOW, V. T. Open-channel hydraulics. Caldwell: Blackburn Press, 2007. 680 p. ISBN 978-1932846188.