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Published byIsabel Horton Modified over 9 years ago
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Dept. of Agricultural & Biological Engineering University of Illinois
ABE 223: ABE Principles – Machine Systems Regenerative Circuits Tony Grift Dept. of Agricultural & Biological Engineering University of Illinois
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Differential area cylinder: Flow and displacement
Force Equilibrium Velocity of piston Dept. of Agricultural Engineering University of Illinois
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Conventional advance in circuit
Dept. of Agricultural Engineering University of Illinois
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Force equilibrium during Regenerative advance
Dept. of Agricultural Engineering University of Illinois
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Velocity during Regenerative advance
KCL in node N Velocity of piston (differential area cylinder) Dept. of Agricultural Engineering University of Illinois
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Velocity during Regenerative advance
Dept. of Agricultural Engineering University of Illinois
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Velocity during Regenerative advance
Dept. of Agricultural Engineering University of Illinois
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Summary Conventional Regenerative Force: Velocity:
Conventional Regenerative Force: Velocity: Dept. of Agricultural Engineering University of Illinois
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Summary cont. In other words, during regenerative advance, the cylinder behaves as if its cap end area is equal to the rod area which is equal to Cap end Area Rod end Area (Annular) Rod Area Dept. of Agricultural Engineering University of Illinois
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Regenerative advance in circuit
Dept. of Agricultural Engineering University of Illinois
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Regenerative advance in circuit with switchover
(pressurize cap and rod end) Conventional (rod end to tank) Dept. of Agricultural Engineering University of Illinois
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Conventional advance (v = 0.17 ms^-1)
Dept. of Agricultural Engineering University of Illinois
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Regenerative advance (v=0.43 ms^-1)
Dept. of Agricultural Engineering University of Illinois
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Why Regenerative Circuits
Benefit of fast advance Example Press a workpiece Advance (extend) cylinder rapidly (regeneratively) with reduced force, using rod area (not annular) Detect increased pressure when press makes contact Switch automatically to conventional advance Press the work piece with full force (using cap end area) There is only regenerative advance (extension), no retraction Dept. of Agricultural Engineering University of Illinois
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Dept. of Agricultural Engineering University of Illinois
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Dept. of Agricultural & Biological Engineering University of Illinois
ABE 223 Agricultural & Biological Engineering I OREE section Regenerative Circuits The End Dept. of Agricultural & Biological Engineering University of Illinois
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