Control Engineering for mechanical

Control Engineering for mechanical _lec2.pptx

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MdHelalHossain6

slide on control

Introduction to Hydraulics & Pneumatics
Dr. Biplov Kumar Roy
Assistant Professor (Mechanical Engineering)
Dhaka University of Engineering & Technology
DEGREE PROGRAM: B.Sc. in Mechanical Engineering
COURSE CODE: ME 4401
COURSE TITLE: Control Engineering

Structure of a hydrostatic drive
Aggregate Control
elements
Actuator
Valves,
determining the
path, pressure, flow
rate of the working
fluid
Elements doing
work
• Linear
• Rotational
• Swinging
Pump, motor
Fluid reservoir
Pressure relief
valve
Filter
Piping

2005/2006 I. Hydraulic and Pneumatic Systems 3
A typical hydraulic system
1 – pump
2 – oil tank
3 – flow control valve
4 – pressure relief valve
5 – hydraulic cylinder
6 – directional control
valve
7 – throttle valve

ISO symbols in Hydraulic & Pneumatics System

Control Engineering for mechanical _lec2.pptx

Pressure Control valve symbols
Pilot-Operated Relief Valve Pressure-Reducing Valve Unloading Valve
Sequence Valve
Counterbalance valves

Direction Control valve Symbol
Check valves Shuttle valves 3/2 way valve : 3ports and 2 position DC
5/2 Solenoid
Operated D.C.V.
4/2 Solenoid
Operated D.C.V.
4/3 Closed
centre D.C.V
4/3TandemCentre
4/3 Floating Neutral 4/3 Open Center 4/3 Regenerative Center

Flow Control valve Symbol
Variable Flow
Control Valve
Pressure compensated F.C.V. Press. & temp. Compensated F.C.V.
Flow control Valve with
integral Check Valve

Auxiliary Devices in FPS
Accumulators
Dead Weight Type Spring Loaded Type Gas Charged With
separator
Gas Charged
Without Separator
Press. Guage Flow meter Prime Mover Electric Motor
Cooler Heater Telescopic Cylinders

The document discusses hydraulics and pneumatics systems. It describes how these systems use fluids or compressed gases to transmit power through distribution lines to actuators, converting electrical or mechanical energy into fluid potential energy. Applications mentioned include vehicle steering/braking, spacecraft systems, industrial machinery, and more. Key components are identified as pumps/compressors, pressure regulators, valves, and actuators like cylinders. Pascal's law relating fluid pressure transmission is also summarized.

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Final control elements are devices like valves and pumps that adjust the manipulated variable to control process parameters. Common parameters include pressure, flow, level, and temperature. Control valves have components like actuators, bodies, and trim. Actuators provide the force and include pneumatic, hydraulic, and electric types. Valves types are ball, butterfly, gate, and globe valves. Positioners maintain the correct valve position. Control valves can experience issues like leaks, sticking, or nonlinear flow. Troubleshooting addresses problems like deadband, overshoot, sizing errors, and nonlinear characteristics.

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This document provides information and instructions for a practical task involving pneumatic circuits for a Mechanical Engineering diploma program. It includes the objectives, theory, problems, equipment, procedures, and assessment criteria for the task. Specifically, it covers direct and indirect control of pneumatic cylinders using various valves. The task requires students to design and implement pneumatic circuits that directly or indirectly control double-acting cylinders using buttons or pilot-operated valves to meet specified objectives. Circuits are assessed based on setup, task completion, component knowledge, and time management. Safety measures for working with compressed air are also outlined.

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A hydraulic system was developed to actuate a cylinder forwards and backwards using an electronic valve. The system includes a directional valve, pressure transducer, and flow meter connected to a computer interface. It allows monitoring and controlling the cylinder's position. The interface displays pressure, flow rate, and includes controls to move the cylinder or return it to neutral. This provides a test system for developing feedback control of hydraulic cylinders.

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The document discusses MOV (motor operated valves) and pneumatic control valves. It covers the types and applications of MOV, differences between MOV and pneumatic control valves, and problems with MOV. It also discusses pneumatic control valves in more detail, including the main types (air to open and air to close), accessories like regulators and I/P converters, and the working principles of I/P converters and positioners. The document is a presentation on control valves for a course on instrumentation and control basics.

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This document discusses key principles of hydraulic and pneumatic systems including: - Pascal's law which states that pressure in a fluid is transmitted equally in all directions - Energy transfer from a prime mover like a pump to an actuator - The role of fluid flow in operating actuators by extending or retracting cylinders - How actuator speed is determined by flow rate and cylinder volume displacement - How pressure results from restricting fluid flow from a pump - The use of schematics using standardized symbols to represent hydraulic and pneumatic components.

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This document presents a paper on aircraft hydraulic systems. It describes the basic components and operation of hydraulic systems used in aircraft, including hydraulic pumps, valves, actuators, and other components. It provides examples of typical hydraulic systems for Boeing and Airbus aircraft. It then discusses various parameters of aircraft hydraulic systems such as hydraulic fluid, pressure, temperature, and flow rate. Finally, it outlines the testing process for aircraft hydraulic systems.

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Hydraulic Systems and Control ComponentsBalasundar P

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The document discusses the basic components and types of control valves used in hydraulic systems. It describes the main components of a hydraulic power pack including the hydraulic pump, electric motor, reservoir, fluid, valves, accumulator, filtration and cooling systems. It then explains the purpose and classifications of different types of directional control valves, flow control valves, and pressure control valves. These include rotary spool valves, sliding spool valves, check valves, globe valves, gate valves, and pressure relief valves. Diagrams are provided to illustrate examples of various valve types.

human intervnetaip lsfjslk sfsjlkfjsljga sjflasjfkzInafarRaFI

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Control Engineering for mechanical _lec2.pptx

1. Introduction to Hydraulics & Pneumatics Dr. Biplov Kumar Roy Assistant Professor (Mechanical Engineering) Dhaka University of Engineering & Technology DEGREE PROGRAM: B.Sc. in Mechanical Engineering COURSE CODE: ME 4401 COURSE TITLE: Control Engineering

2. Structure of a hydrostatic drive Aggregate Control elements Actuator Valves, determining the path, pressure, flow rate of the working fluid Elements doing work • Linear • Rotational • Swinging Pump, motor Fluid reservoir Pressure relief valve Filter Piping

3. 2005/2006 I. Hydraulic and Pneumatic Systems 3 A typical hydraulic system 1 – pump 2 – oil tank 3 – flow control valve 4 – pressure relief valve 5 – hydraulic cylinder 6 – directional control valve 7 – throttle valve

4. Hydraulic power control

5. ISO symbols in Hydraulic & Pneumatics System

9. Pressure Control valve symbols Pilot-Operated Relief Valve Pressure-Reducing Valve Unloading Valve Sequence Valve Counterbalance valves

10. Direction Control valve Symbol Check valves Shuttle valves 3/2 way valve : 3ports and 2 position DC 5/2 Solenoid Operated D.C.V. 4/2 Solenoid Operated D.C.V. 4/3 Closed centre D.C.V 4/3TandemCentre 4/3 Floating Neutral 4/3 Open Center 4/3 Regenerative Center

11. Flow Control valve Symbol Variable Flow Control Valve Pressure compensated F.C.V. Press. & temp. Compensated F.C.V. Flow control Valve with integral Check Valve

12. Auxiliary Devices in FPS Accumulators Dead Weight Type Spring Loaded Type Gas Charged With separator Gas Charged Without Separator Press. Guage Flow meter Prime Mover Electric Motor Cooler Heater Telescopic Cylinders

13. Pressure Relief Valve

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Control Engineering for mechanical _lec2.pptx

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