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Load Application Analysis: Hydraulic Cylinders

Load Application Analysis: Hydraulic Cylinders. Benefits: Load Accuracy Required Analysis (Incompressible Fluid) Drawbacks : Safety Maintenance From PRP and Markus’s Thesis: Up to 900lbs (4000N) applied force Up to 2000 rom shaft speed (33Hz)

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Load Application Analysis: Hydraulic Cylinders

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  1. Load Application Analysis:Hydraulic Cylinders • Benefits: • Load Accuracy • Required Analysis (Incompressible Fluid) • Drawbacks: • Safety • Maintenance • From PRP and Markus’s Thesis: • Up to 900lbs (4000N) applied force • Up to 2000 rom shaft speed (33Hz) • Journal to sleeve clearance: 35 to 95 microns • Compressor Operating Rpm: 360rpm (Dr. Kolodziej) Rochester Institute of Technology

  2. Load Application Analysis: Hydraulic Cylinders • Parker Electro-Hydraulic Actuator (EHA) • Hybrid combining benefits of hydraulic cylinder and electric servo • Self-contained unit • Speed and Load Range • Size Rochester Institute of Technology

  3. Load Application Analysis: Hydraulic Cylinders • Calculations for Parker EHA (w/ Motor B and 0.327 gear): • Distance for Piston to move (conservative): • 95µm=0.00374"; 0.00374"*2= • 0.00748“ ≈0.01" (cushion) • Piston Speed from Graph ≈ 1.8in/s • Cycle time: • (0.01in)/(1.8 in/s)*2(extend & retract)= • 0.011secs/cycle • Actuator Frequency: • 1/(0.011 secs/cycle)= • 90 cycles/second = 90Hz Rochester Institute of Technology

  4. Load Application Analysis:Hydraulic Cylinders Rochester Institute of Technology

  5. Load Application Analysis:Hydraulic Cylinders • Challenges: • Are EHA’s load input based or displacement input based? • Response time to inputs • Piston Velocity varies with load • Extension load, as opposed to retract (Additional actuator(s)?){$$$} Rochester Institute of Technology

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