principles of mechatronic systems ( ) · introduction to mechatronics and measurement systems,...

Principles of Mechatronic Systems)جلسه نهم(هاي مكاترونيكي مباني سيستم

By: Reza Tikani

Mechanical Engineering Department

Isfahan University of Technology

سيستم هاي هيدروليك

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Introduction to Mechatronics and Measurement Systems, David G. Alciatore AND Michael B. Histand

Hydraulic systems are designed to move large loads by controlling a high-pressure

fluid in distribution lines and pistons with mechanical or electromechanical valves.


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Pneumatic systems are similar to hydraulic systems, but they use compressed air as the

working fluid rather than hydraulic liquid. The components in a pneumatic system are

illustrated in the figure. A compressor is used to provide pressurized air, usually on the

order of 70 to 150 psi (482 kPA to 1.03 MPa), which is much lower than hydraulic system

pressures. As a result of the lower operating pressures, pneumatic actuators generate much

lower forces than hydraulic actuators.

سيستم هاي نيوماتيك


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• A pump to deliver high pressure Fluid

• A pressure regulator to limit the pressure in the system

• Valves to control flow rates and pressures


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A hydraulic pump is usually driven by an electric motor (e.g., a large AC induction motor)

or an internal combustion engine. Typical fluid pressures generated by pumps used in heavy

equipment (e.g., construction equipment and large industrial machines) are in the 1000 psi

(6.89 MPa) to 3000 psi (20.7 MPa) range.

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Directional Control Valve

Pressure Valve

Flow Valve

Non-Return Valve


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Single Acting Cylinders

Double Acting Cylinders

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