Development and Optimization of a Soft-Projectile Launcher Utilizing Mechanical Energy
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Transcript of Development and Optimization of a Soft-Projectile Launcher Utilizing Mechanical Energy
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Development and Optimization of a Soft-Projectile Launcher Utilizing Mechanical Energy
Aaron WagnerMike Knoop
University of Missouri, MAE Capstone 4980, Fall 2011
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HvZ Image
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Defining the Problem
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Consumers modify blastersto increase power
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Increasing power decreases performance
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Goal of this capstone group
1. Verify if adding rotation to darts improves flight characteristics
2. Develop and optimize a design to maximize performance
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Defining Performance
a) Distance
b) Shot Grouping
c) Consistency of (a) and (b)
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Cost of
Manufacture
RPM of Soft
Projectile
Distance
Traveled
Shot Grouping
Weight of soft projectil
e
Non Custom
Parts
Mass of
System
Muzzle
Velocity
Current
Competitor
s
Custome
r Importance
Improve
ment Ratio
Increased Effective Range 9 9 9 9 3 5 1.7Safety 9 6 4 4 1Cost 9 9 4 4 1Weight 1 9 3 3 1Durability of System 1 3 3 3 1Absolute Importance 39 45 45 45 39 45 27 69 354Relative Importance 11 13 13 13 11 13 8 19Current Competitors 5 1 2 2 5 5 4 2Technical Difficulty 5 3 3 4 5 5 5 4Target Value a 7.7* b 40Units $ RPM m cm m/s
Notesa Less than $200b 22.6±12.3*
This value is expected to change once adjustments are made to account for improvements resulting from the copper breach.
Quality Function Deployment
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Design Strategy: Iteration
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Designing the Initial Prototype
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Design inspiration
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Design Strategy: Mock Launcher
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Initial Prototype Concept
Directionof Motion
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Selecting a Flywheel Rotational Velocity
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Measuring muzzle velocity of existing soft-projectile launcher
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Calculating a necessary rotational velocity
= 30 m/s = 3.81 cm.
= 7500 RPM
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Construction and Development
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"A successful FMEA activity helps a team to identify potential failure modes based on past
experience "
Failure Mode Effects Analysis
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Initial Prototype Build
Directionof Motion
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Second Prototype BuildDirectionof Motion
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Highspeed of Jamming
http://www.youtube.com/watch?v=c_Mi0BmmiFc&list=PL0FF1657C0B08FAB8
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Third Prototype BuildDirectionof Motion
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Highspeed of Fishtailing
http://www.youtube.com/watch?v=BSyDEoXlY4c&list=PL0FF1657C0B08FAB8
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Highspeed of Single-Prong Barrel Close-up
http://www.youtube.com/watch?v=87Y0A6IMJM8&list=PL0FF1657C0B08FAB8
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Barrel Iteration
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Highspeed of Double-Prong Barrel Close-up
http://www.youtube.com/watch?v=f1uctE_u4qk&list=PL0FF1657C0B08FAB8
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Final Prototype BuildDirectionof Motion
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Testing and Optimization
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Parameters to Optimize
Flywheel rotation angle
Flywheel gap distance
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Foam darts with high rotational velocities are less-able to self-correct!
1250 RPMHigh tip-offActually self-corrects
5000 RPMLittle apparent tip-offActually fishtails
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1250 RPM Barrel Close-up
http://www.youtube.com/watch?v=9cDyEDYOw7E&list=PL0FF1657C0B08FAB8
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5000 RPM Barrel Close-up
http://www.youtube.com/watch?v=wBa-ZM7owLc&list=PL0FF1657C0B08FAB8
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Selecting a Flywheel Rotational Velocity
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Selecting a Flywheel Gap Distance
0.50 0.46 0.42 0.38 0.33 0.290.0
10.0
20.0
30.0
40.0
50.0
Distance Between Wheels (in)
Dis
tanc
e T
rave
led
(ft)
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Does Rotational Velocity Help?
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Yes
25 30 35 40 45 50
0123456
Neutral Angled
Distance (ft)
Num
ber
of O
ccur
ence
s Distance +4.6 ft. (14%)
Standard Deviation -2.3 ft. (40%)
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Future Work
• Precision machining• Foam dart wear• Integrating into an existing SPL
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Final Thoughts
• Iteration is very important• Pick a project which motivates you• Relevance, Market Size
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Acknowledgments
Humans vs. Zombies Mizzou for project funding
Brian Graybill for teaching us SolidWorks
Dr. El Giz-awy for Capstone guidance
Richard Oberto for fixing the highspeed camera!
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Questions and Feedback
(or should we just test fire of our final design?)