338-0502/02 – Hydraulic Elements and Systems (HyPrv)
| Gurantor department | Department of Hydromechanics and Hydraulic Equipment | Credits | 5 |
| Subject guarantor | doc. Dr. Ing. Lumír Hružík | Subject version guarantor | doc. Dr. Ing. Lumír Hružík |
| Study level | undergraduate or graduate | Requirement | Compulsory |
| Year | 1 | Semester | winter |
| | Study language | Czech |
| Year of introduction | 2013/2014 | Year of cancellation | |
| Intended for the faculties | FS | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
Students will gain detailed knowledge of the functions, construction, calculation, properties, and use of hydraulic components. They are able to use these components in hydraulic systems.
They will extend their knowledge in the area of design and calculation of selected hydraulic circuits and systems, especially in terms of their control, energy balance, operation, and maintenance, reliability, etc.
Teaching methods
Lectures
Tutorials
Experimental work in labs
Summary
In the course Hydraulic components and systems, students will learn the function, construction, parameters, characteristics, calculation and use of hydraulic components, the basic of hydrostatic systems theory and the basic types of hydraulic circuits.
In exercises, students practice hydraulic components marks, measure static characteristics of hydraulic components and practice the basics of hydraulic systems theory.
Compulsory literature:
Recommended literature:
Way of continuous check of knowledge in the course of semester
Credit: during the semester will be enter 2 programs for which it is possible to get up to 24 points, at the end of the semester will be control test for max. 8 points. Minimum for obtaining credit is 20 points, max. 32 points.
Examination: oral exam - 2 questions, each for max 25 points, defense of programs for max. 18 points.
E-learning
The following study materials are available on the department website:
http://www.338.vsb.cz/studium/studijni-opory/
Other requirements
List of questions to examination
1. Working fluids of hydraulic systems: physical properties.
2. Working fluids of hydraulic systems: types of working fluids and their applications.
3. Hydrostatic pumps and motors: definitions, efficiency, characteristics.
4. Hydrostatic gear pump and motors.
5. Hydrostatic screw and vane pump and motors.
6. Hydrostatic radial piston pump and motors.
7. Hydrostatic axial piston pump and motors.
8. Control of geometric volume pump and motors. Constant pressure, constant flow, and constant power control.
9. Hydraulic cylinders: construction and calculation.
10. Hydraulic cylinders: production technology.
11. Seals in hydraulics.
12. Check valves. Controlled check valves. Double-sided hydraulic lock. Shut-off valves.
13. Seat and spool directional control valves.
14. Throttle valves. Two-way and three-way flow control valves. Braking valves.
15. Direct-operated and pilot-operated pressure control valves
16. Logical slip-in cartridge valves.
17. Proportional technique.
18. Servo technique.
19. Hydraulic accumulators.
20. The purity of liquids. Filters and filtration.
21. Hydraulic systems with two or more hydraulic motors. Synchronous operation of hydraulic motors.
22. Hydraulic systems for handling loads.
23. Hydraulic systems with hydraulic accumulators.
24. Valve control of the hydrostatic drive.
25. Volumetric control of the hydrostatic drive. Hydrostatic transmission.
26. Thermal calculation of hydraulic system.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
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.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction