1. FINAL PRESENTATION UNIVERSITY OF CINCINNATI
MUTHAR AL-UBAIDI, PHD
04/20/17

2. Agenda Team Introductions Problem Statement Project Objectives
Design and FEA Analysis
Fabrication
Hydraulic Circuit
Hydraulic Components
Testing
Cost Analysis
Lessons Learned
Conclusion

3. Muthar Al-Ubaidi, PhD Team Advisor

4. Dorian Durant

5. Ray Frank

6. Bill Hayes

7. Tyler Tavalero

8. Paige Weaver

9. Problem Statement
Design, build, and test a human powered vehicle utilizing hydraulics as a means of power transmission. The vehicle will compete in three events:
Sprint Race
Durability Race
Efficiency Challenge
The following design parameters must be observed:
Must accommodate a single rider who can enter and operate the vehicle unassisted
Comply with all appropriate safety codes
Vehicle cannot leak any hydraulic fluid
Vehicle must have multiple, fully active, independent brakes
Guards must be used to protect the rider from unsafe moving components
No chains or belts can be utilized in the design
Dorian

10. Project Objectives
Reduce the overall weight relative to the 2016 prototype
Eliminate electronic components
Shorten hose lengths as much as possible
Minimize number of fittings
Change the input gear ratio leading into the pump
Use a two-wheeled bicycle frame
Paige

11. Design and FEA Analysis
Design Variables
Values
Units
Weight Rider
180 lb
Weight Bike
100
Weight Total
280
Incline Grade
0.05 %
Incline
2.86
Degree
Rolling Resistance Factor
0.008
Rough Paved Asphalt
Total Resistance
16.22
Tire Diameter 24 in
Tire Radius 1 ft
Torque
ftlb
Pressure
2200
psi
Displacement Motor (90% Eff)
0.62
in3/rev
Velocity
12.5
mi/hr
RPM
175
Rev/min
Flow Rate (95% Eff)
0.49
gal/min
Power
0.63 hp
Size Hose
0.25
Velocity of Oil
3.21
ft/s
Pedal RPM
250
Displacement Pump (95% Eff Pump & Motor)
0.50
Pump Displacement (cc)
8.26
cc/rev
Motor Displacement (cc)
10.12
Tyler

12. Design and FEA Analysis
Two wheeled
2.3L Reservoir inside bike frame geometry
1:3 Gear ratio
1L Accumulator
Bill

13. Design and FEA Analysis Cont’d
200lb Rider
4,978psi Max
50,000psi Yield strength
.005” Max displacement
Bill

14. Design and FEA Analysis Cont’d
200lb Force
9,270psi Max
51,000psi Yield strength
.0003” Max displacement
Bill

15. Hydraulic Circuit 2 Phase Ball Valve Actuated Pressure Relief Valve
Charging accumulator
Accumulator discharge & direct drive
Ball Valve Actuated
Pressure Relief Valve
Ray

16. Hydraulic Components Parker 1 liter, 4000 PSI piston accumulator
Pump: ACNAL02ACA A
26002-LZD
8.2 cc
3/4" keyed shaft
Rear Ports
Motor: ADMAR04ACA A
10.2 cc
5/8" keyed shaft
Side Ports
Parker 1 liter, 4000 PSI piston accumulator
Prince RV4H 3000 PSI Pressure Relief Valve
Set to 2800 PSI
Anchor AE PSI Hydraulic Ball Valve
Tyler

17. Fabrication 19 Fabricated parts 4 Subassemblies Plasma cut Welding
Milling
Lathe
Explain rear shaft, pedal shaft, reservoir fabrication, Paige

18. Testing Initial Testing Tested at Different Gas Pressures
No nitrogen charge
Ran at lower pressures than anticipated
Tested at Different Gas Pressures
Between 2000 PSI Nitrogen and 500
Lowered pressure in 100 PSI increments
Tested to find optimal balance between charged volume and direct drive capability
1000 PSI performed best on smooth, level concrete
Tyler

19. Cost Analysis
Parameters were put in place as a guide through the costs for the overall fabrication of the bicycle. They are listed below:
Labor: $60/hr
Average Cost of Steel: $4.00/lb
Efficiency of Production: 95%
Yearly production: 500 units
Life Volume: 5000 units
The total cost of the 2017 University of Cincinnati’s prototype was $ Including labor costs, the total cost of the prototype is $40,012.
Ray

20. Cost Analysis (cont.)
Dorian

21. Lessons Learned Practical Hydraulics Applications
RPMs are important
Small components are surprisingly capable
Design with Manufacturing in Mind
Multiple Ways to Approach Machining
The Simplest Solution is Often Best
Rely on Your Team

22. Conclusion Design Goals Achieved Possible Improvements
Weight Reduction to 100 Pounds Maximum
Reliable Circuit Performance
Consistent Speeds and Take-offs
Build Quality
Possible Improvements
Regenerative Braking
Lower Fluid Requirements
Precharge Stability
Lower Center of Gravity