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# lec8_part1 - AE 383 System Dynamics Lecture Notes 8(July...

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1 AE 383 System Dynamics Lecture Notes 8 (July 11 th 2006) FLUID SYSTEMS Hydraulic systems use liquids (incompressibility) (free surface) Pneumatic systems use gases (expands to fill its vessel) Fluid systems involve pressure signals Pressure = force per unit area Units = N / m 2 (pascal (Pa) ) lbf / in 2 1 lbf / in 2 = 6895 Pa The standard barometer reading at sea level is 760 mm of mercury at 0 ° C. Gage pressure refers to the pressure measured with respect to atmosphere pressure. Absolute pressure = gage pressure + barometer pressure 760mmHg = 1.0332 kgf / cm 2 = 1.0133 * 10 5 N / m 2 = 14716 lbf / in 2 Liquid Level Systems Resistance and capacitance of liquid level systems: When a fluid is forced through a pipe at a constant flow rate, a pressure difference related to that flow rate must be exerted to maintain the flow. It takes larger pressure differences to cause larger flow rates. Now consider the flow through a short pipe with a valve connected to a tank. The pressure in this system is determined by the height of the liquid in the tank. The

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