Download presentation
Presentation is loading. Please wait.
Published byEzra McBride Modified over 9 years ago
1
Load Application Analysis: Hydraulic Cylinders October 5, 2013Rochester Institute of Technology1 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)
2
Load Application Analysis: Hydraulic Cylinders October 5, 2013Rochester Institute of Technology2 Parker Electro-Hydraulic Actuator (EHA) Hybrid combining benefits of hydraulic cylinder and electric servo Self-contained unit Speed and Load Range Size
3
Load Application Analysis: Hydraulic Cylinders October 5, 2013Rochester Institute of Technology3 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
4
Load Application Analysis: Hydraulic Cylinders October 5, 2013Rochester Institute of Technology4
5
Load Application Analysis: Hydraulic Cylinders October 5, 2013Rochester Institute of Technology5 Shaft Operating RPM360RPM Shaft Cycle Time0.1667s Shaft Frequency6Hz EHA Piston Velocity1.8in/s EHA Piston Displacement0.01in EHA Displacement Time0.0056s EHA Cycle Time0.0111s EHA Frequency90Hz EHA X-Direction Force Cycles2cycles/rotation EHA X-Direction Force Frequency12Hz EHA Y-Direction Force Cycles4cycles/rotation EHA Y-Direction Force Frequency24Hz 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)?){$$$}
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.