Post on 17-May-2015
description
Sonobuoy Solutions“PBP Sonar Buoy”
Group 7
Johan Arias, Joshua Benedictos, Remle Deinla, Kevin Fliflet, Benjamin Liu, Jin Oh
Background6
Problem6: - Anti-submarine warfare
- Underwater acoustic research
- Development of precision airdrop systems
Joshua Benedictos
Past Solutions1: - Low altitude drops
- Aerial Decelerator Systems
• Parachutes
• Rotochutes
• Guidance
BackgroundLow Altitude Drops2
Pros:
o Minimized drift = minimized placement error Cons:
o Complex aircraft operation
o Higher fuel cost
o Surface-to-air attack risk
Joshua Benedictos
High Altitude Drops2
Pros:
o Smoother aircraft operation
o Reduced fuel cost
o Surface-to-air attack safety = tactical advantage
Cons:
o Wind and placement errors
Vehicle ConfigurationVersatile design with ease of
manufacturing and mission completion in mind.
• Constrained to cost under $100/unit.
● Rotor configuration and parachute used for primary and secondary deceleration.
● Inflatable bladder to increase buoyancy.
● US NAVY MK-1 float coat mechanism used to release bladder.
Johan Arias
Starting Envelope
Parachute Automated Activation Mechanism
Deployed Blades
Deployed Bladder and Blades
Vehicle ConfigurationUnique design features that will support the
readiness supportability of the mission
• Hinge will automatically establish a desired angle of attack.
• Interchangeable blades to accommodate variable weather weather and/or wind profiles.
• Flushed configuration that could be potentially used by many launch systems.
Johan Arias
Interchangeable rotor blades
Hinge designed to create a desired angle of attack
Solenoid release system Flushed configuration to be used
with multiple launching mechanisms.
Concept of OperationDesign Goals:
• Constraints o Impact Velocity vs Impact
Accuracyo Impact Velocity vs Descent
Time o Costs vs Robustness and
Environmental Impact o Mitigating GPS vs Robustness
of Design
• Robustnesso Interchangeable Bladeso Capable of Variable
Deployment AltitudesKevin Fliflet
Concept of Operation• Two stage rotocopter
o Damped Hingeo NACA 4609 9% Airfoilo Released via Solenoid
• Parachute Chambero Spring Loadedo Rotating Eye Hooko Seals after deployment
• Pitot Tube Data Acquisition
o Determines Deployment Path
Kevin Fliflet
NACA 4609 9%Damped Hinge
Locking Solenoid
Pitot Tube
Flight Profile
Jin Oh
Jin Oh
Flight Profile
Assumptions: +15% variation to wind profile (speed & direction)Normal distribution to wind profileResults: +100 m within target drop zone, 100% of the timeAccuracy of landing zone changes depending on deploy altitude, but no significant changes to precision
Societal and Global Impact:Major Costs and Weight Analysis
Benjamin Liu
Component Cost ($)
Weight (lb)
Parachute5 37.5 1
Microcontroller1
5
15 0
Flotation device10
1.5 1
Rotor blades13 20 1
Solenoids4 25 1
Pitot Tube16 15 0
Misc 15 5
TOTAL 129 9
Total Unit Cost:$ 129Assumed savings on mass production (~9000 units) 15%~$19
Estimated Cost/unit:~$ 110
Societal and Global Impact- Governmental, Social,
Research Advantages11
- Humanitarian Aid
- Increased volume as major drivers are streamlined
- Reusability and Possible Biodegradability12 Benjamin Liu
Risk and Regulatory Assessment
Remle Deinla
Uncontrolled DescentTotal System Failure: accuracy decreases, however it still sits within a 300 m box. Upon impact velocity would be 545 m/s and system would not survive, however the likelihood is low
Multitude of fail-safe systems:- Release systems depend on timer and velocity check- Factor of Safety of 1.2 for landing velocity- Rotor hinge factor of safety 1.3
Mission Flow Chart
Risk and Regulatory Assessment
Remle Deinla
Aeronautics and Space§91.15 Dropping objects8
Protection of the Environment
§227.4 Criteria for evaluating environmental impact9
§227.5 Prohibited materials9
Conclusion: Since the unit was designed to be dropped into the ocean (not over a populated area), it’s not made of hazardous materials and will not harm people, or the marine environment, it is safe. However, should it remain floating, it needs not interfere with fishing, navigation or other ocean uses.
References1. Naval Postgraduate School. Aerodynamic Decelerator Systems Center. U.S. Navy, 20 Sept. 2011. Web. 07 Mar. 2014.
<http://nps.edu/Academics/Centers/ADSC/>.
2. United States. Naval Air Systems Command. Department of the Navy. High Altitude Launch of ASW Sonobuoys. By Roger Hoiler. N.p., n.d. Web. 07 Mar. 2014. <http://www.dtic.mil/dtic/tr/fulltext/u2/a106692.pdf>.
3. SeaLand Aire Technologies, Inc. SEALANDAIRE TECHNOLOGIES INC, 2013. Web. 09 Mar. 2014. <www.sealandaire.com>.
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5. "SkyAngle Parachute." B2 Rocketry Company. N.p., 2003. Web. 26 Feb. 2014. <http://www.b2rocketry.com/>.
6. Anderson, Mark. "Air Vehicle Design Project, Air Vehicle SImulation." MAE 155Aero. N.p., n.d. Web. 25 Feb. 2014. <https://sites.google.com/site/mae155aero/>.
7. Howard, Austin, and Donald Elger. "Rotary Wing Decelerators for Miniature Atmospheric Entry Probes." N.p., n.d. Web. 11 Mar. 2014. <http://enu.kz/repository/2009/AIAA-2009-2996.pdf>.
8. "Part 91- General Operating and Flight Rules." Electronic Code of Federal Regulations. N.p., 03 Mar. 2014. Web. 11 Mar. 2014. <http://www.ecfr.gov/cgi-bin/retrieveECFR?gp&SID=069887a24b6c23dd0133e8ca5de91277&n=14y2.0.1.3.10&r=PART&ty=HTML#14:2.0.1.3.10.1.4.8>.9. "Part 227- Criteria for the Evaluation of Permit Applications for Ocean Dumping of Materials."Electronic Code of Federal Regulations. N.p., 10 Mar. 2014. Web. 11 Mar. 2014. <"Part 91- General Operating and Flight Rules." Electronic Code of Federal Regulations. N.p., 03 Mar. 2014. Web. 11 Mar. 2014. .>.
10. Rubber Inner Tube. Advertisement. N.p., n.d. Web. 11 Mar. 2014. <http://www.globalsources.com/manufacturers/Rubber-Inner-Tube.html>.
11. "Biodegradable Sonobuoy Decelerators (WP-201222)." N.p., n.d. Web. 11 Mar. 2014.
12. "Studying Military Expended Materials in the Marine Environment." Weblog post. N.p., n.d. Web. 11 Mar. 2014.
14. "Radio Control Planes, Helicopters, Cars, Boats, FPV and Quadcopters - Hobbyking ."HobbyKing Store. N.p., n.d. Web. 11 Mar. 2014.
15. "How to Make Your Own Arduino Board." Instructables.com. N.p., n.d. Web. 11 Mar.
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