FLUID POWER SYSTEMS (PE – IV) B.Tech. IV Year I Sem JNTUH R-18

• Compare and contrast the advantages and limitations of hydraulic and pneumatic systems for different applications.

• Explain the principles of energy conversion and energy losses in hydraulic circuits.

• Analyze the working principles of different types of hydraulic pumps and motors (gear, vane, piston) and their performance characteristics.

• Differentiate between open and closed center hydraulic systems and their impact on efficiency.

• Identify and explain the functions of various ISO symbols used in fluid power system diagrams.

Unit II: Hydraulic Actuators and Control Valves

• Describe the working principles of various types of hydraulic actuators (cylinders, motors) and their applications.

• Analyze the design and constructional details of different types of control valves (directional, pressure, flow).

• Explain the concept of valve lap and its influence on flow characteristics.

• Derive and apply mathematical models for analyzing the flow forces and lateral forces acting on spool valves.

• Describe the operation and design principles of series and parallel pressure compensation flow control valves.

• Perform a detailed analysis of the design and functionality of a flapper valve in a hydraulic system.

Unit III: Hydraulic Circuits and Proportional Control

• Explain the purpose and design of various proportional control valves and servo valves in complex hydraulic systems.

• Analyze the impact of nonlinearities like backlash, hysteresis, dead band, and friction on hydraulic system performance.

• Design and analyze the operation of typical hydraulic circuits, including regenerative circuits, high-low circuits, synchronization circuits, and accumulator sizing.

• Explain the working principles and applications of intensifier circuits (meter-in, meter-out, bleed-off) and fail-safe/counterbalancing circuits.

Unit IV: Pneumatic Systems and Circuits

• Identify the key components of pneumatic systems and their functions.

• Compare and contrast the types and operation of direction, flow, and pressure control valves in pneumatic systems.

• Develop and analyze single and multiple actuator circuits for pneumatic systems.

• Explain the functionality of valves for logic functions like time delay valves, exhaust air throttling, and supply air throttling.

Unit V: Advanced Control and Applications

• Interpret and utilize displacement-time and travel-step diagrams for analyzing and designing pneumatic circuits.

• Differentiate and explain the principles of will-dependent, travel-dependent, and time-dependent control in fluid power systems.

• Analyze the concept of combined control and program control in complex fluid power systems.

• Explain the functionalities of electropneumatic and air-hydraulic control systems and their applications.

• Draw and interpret ladder diagrams for controlling fluid power systems in various industrial applications.

• Discuss the use of fluid power systems in assembly lines, feeding mechanisms, metalworking machines, materials handling, and plastics working.

Bonus Questions:

• Analyze the environmental impact of fluid power systems and discuss strategies for improving their efficiency and reducing energy consumption.

• Discuss the advancements in computational fluid dynamics (CFD) and its role in designing and optimizing fluid power systems.

• Evaluate the challenges and opportunities for integrating digital technologies and automation in future fluid power systems.