MKM 503E-Week7_Pneumatics

# MKM 503E-Week7_Pneumatics - MKM 503E Week 7 Pneumatics...

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MKM 503E- Week 7 Pneumatics prepared by Assist. Prof. Pinar Boyraz October 2011 1 ITU, 2010

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Outline 2 ITU, 2010 Pneumatics- Part I Theoretical Background /Properties of Compressed Air Thermodynamic Processes (short review) Flowrate characteristics of restrictions--- supplementary Convertion of electrical current to mechanical quantities---suppl. Pneumatics- Part II Description of pneumatic components, standard cylinder Non-standard linear actuators Directional control valves Shut-off valves Flow control valves
Properties of Compressed Air/1 3 ITU, 2010 Pneumatic drives use compressed air to store and transmit power or signals. Its properties are therefore significant for behaviour of the drives and a good math model is necessary.

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Properties of Compressed Air/2 4 ITU, 2010
Mathematical Models of Air/1 5 ITU, 2010 Several ways to model the relationship between gas mass, pressure, temperature and volume. One way is to measure relevant sets of paramters and use tables for interpolation. >> Accurate but time consuming! Another way: Use the gas law. Simplest gas law assumes that the gas molecules are perfectly elastic, negligible in size compared with the length of their mean free path and exert no force on each other >> Ideal Gas. Error of the assumption of ideal gas: Compressibility factor Z:

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Definitions Related to Compressed Air/1 6 ITU, 2010 Pressure is defined as ‘force per area’
Definitions Related to Compressed Air/2 7 ITU, 2010

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Thermodynamic Processes/1 8 ITU, 2010 Thermodynamics: discipline of the conversion of heat to other forms of
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MKM 503E-Week7_Pneumatics - MKM 503E Week 7 Pneumatics...

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