18AU56 Hydraulics and Pneumatics syllabus for AU

Introduction to Hydraulic Power: Pascal’s law, The Source of Hydraulic Power: Pumps Pumping theory, pump classification, gear pumps, vane pumps, piston pumps, pump performance, variable displacement pumps.

Hydraulic Actuators and Motors: Linear Hydraulic Actuators [cylinders], Mechanics of Hydraulic Cylinder loading, Hydraulic Rotary Actuators, Gear motors, vane motors and piston motors.

Control Components in Hydraulic Systems: Directional Control Valves – Symbolic representation, Constructional features, pressure control valves – direct and pilot operated types, flow control valves.

Maintenance of Hydraulic systems: Hydraulic oils – Desirable properties, general type of fluids, sealing devices, reservoir system, filters and strainers, problem caused by gases in hydraulic fluids, wear of moving parts due to solid particle contamination, temperature control, trouble shooting.

Hydraulic Circuit Design and Analysis: Control of single and Double – acting Hydraulic cylinder, regenerative circuit, pump unloading circuit, Double pump Hydraulic system, Counter Balance Valve application, Hydraulic cylinder sequencing circuits. Locked cylinder using pilot check valve, cylinder synchronizing circuits, speed control of hydraulic cylinder, speed control of hydraulic motors, accumulators and accumulator circuits.

Pneumatic Controls: Choice of working medium, characteristics of compressed air,.preparation of compressed air- Driers, Filters, Regulators, Lubricators, Distribution of compressed air- Piping layout. Pneumatic Actuators: Linear cylinders – Types, conventional type of cylinder working, end position cushioning, seals. Rod – less cylinders – types, working advantages. Rotary cylinder types construction.

Directional Control valves: Design and constructional aspects, poppet valves, slide valves spool valve, suspended seat type slide valve.

Simple Pneumatic Control: Direct and indirect actuation pneumatic cylinders. Flow control valves and speed control of cylinders supply air throttling and exhaust air throttling use of quick exhaust valve.

Multi-cylinder Applications: Coordinated and sequential motion control. Motion and control diagrams – Signal elimination methods. Cascading method – principle. Practical application examples (up to two cylinders) using cascading method (using reversing valves).

Electro-Pneumatic control: Principles-signal input and output pilot assisted solenoid control of directional control valves, use of relay and contactors. Control circuitry for simple single cylinder applications.

Course Outcomes:

At the end of the course the student will be able to:

• Introduce basics of Hydraulics and pneumatics.
• Describe Various components of hydraulic system and maintenance of hydraulic system
• Design hydraulic system. · Describe layout and details of pneumatic systems.

Question paper pattern:

• The question paper will have ten full questions carrying equal marks.
• Each full question will be for 20 marks.
• There will be two full questions (with a maximum of four sub- questions) from each module.

Textbook/s

1 Fluid Power with applications Anthony Esposito Pearson education, Inc 2000.

2 Pneumatics and Hydraulics Andrew Parr Jaico Publishing Co. 2000.

Reference Books

3 Systems – Principles and Maintenance S. R. Majumdar, Tata McGraw Hill publishing company Ltd. 2001

4 Pneumatic systems S. R. Majumdar Tata McGraw Hill publishing Co 1995.

5 Industrial Hydraulics Pippenger Hicks McGraw Hill, New York. 2001