# Ch 1 - Basic Circuits Brief Overview of Fluid Power Chapter...

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1 Brief Overview of Fluid Power Chapter 1 (Material taken from Fluid Power Circuits and Controls, Cundiff, 2001) Basic Circuits ± Most people have an intuitive concept of what at basic cylinder circuit or motor circuit would look like. ± Two mechanical parameters, torque (T) and shaft speed (N), are converted to two different fluid parameters, pressure (P) and flow (Q), using a pump. And then converted back to mechanical power. Fluid Power Concept Gear Pump Kurtz, 1999, Machine Design for Mobile Applications Pump Systems ± Open loop: provides cooling medium ± Closed Loop: temperature build up Vickers, Mobile Hydraulics Manual Lab-Volt, Hydraulic Trainer Manual

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2 Review of Engineering Concepts ± Work done in a 1-min interval is: ± Work = Force * Distance ± Work = F * 2 π rN = 2 π TN (lb f -in) ± Since power is the rate of doing work, the work done in 1 min is: ± P = Work / t = 2 π TN / 1 (lb f -in/min) Brief Review ± 1 horsepower is 33,000 lb f -in / min, therefore: ± hp = (P / 12) / 33,000 ± If torque is expressed in lb f -in and N is shaft speed in rpm, then power in hp is given by: ± hp = ± hp = TN / 63,025 33,000 ) / ( 2 N T 12 π Basic Concept of Hydraulic Cylinder ± The distance moved is relative to the fluid volume delivered to the cylinder. ± x = V / A ± Where x = distance (in) ± V = fluid volume (in 3 ) ± A = area (in 2 ) Basic Concept of Hydraulic Cylinder con’t ± The force is related to
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Ch 1 - Basic Circuits Brief Overview of Fluid Power Chapter...

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