Critical Design Review NASA University Student Launch Initiative University of Nebraska–Lincoln...
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![Page 1: Critical Design Review NASA University Student Launch Initiative University of Nebraska–Lincoln 2012-2013.](https://reader038.fdocuments.us/reader038/viewer/2022103122/56649ce15503460f949aaf6d/html5/thumbnails/1.jpg)
Critical Design ReviewNASA University Student Launch Initiative
University of Nebraska–Lincoln
2012-2013
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Team Overview
• Mission– Build a launch vehicle to reach an 5,280 feet
altitude– Use a dual-deployment recovery system– Deploy a payload at 1,500 feet– Recover all components in a relaunchable
condition
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Preliminary Design Discussion
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Vehicle Overview
Length: 111”
Diameter: 5.5”
Nose cone: 34.6” Von Karman (LD-Haack), 5.5:1
Fin span: 15” (3-fin configuration)
Weight: 32.8 lbs (With motor and payload)
Motor Mount: 98mm 31” long
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Stability Characteristics
• OpenRocket Model• Will need to be verified• Mass (with motor): 32.8 lbs• CG: 68.3 inches• CP: 78.7 inches
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Launch Characteristics
• Candidate Motors– 75mm diameter– AMW L900RR-P
• Simulation Parameters– 10 foot guide rail
• Rail velocity: 43.32 feet/sec• Thrust-to-weight ratio: 8.33:1
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Recovery• Mounting
– Nosecone Tethered to Transition
– Transition Tethered to Booster
– Forged U-Bolts
• Concept of Operations
– Drogue @ Apogee
– Main @ 1,500-Feet
• Main parachute 84” in diameter, 162” long
• Drogue shute 36” in diameter, X-form
• 52” and 30” of shock chord, 1 inch tubular nylon
• Nomex wadding, 24” length
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Drift analysis
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Kinetic Energy
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Test
Structural test•150+ lbs man•No bending
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Subscale Launch
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Subscale
Actual results•Apogee 1357’•Max Vel. 459 ft/s•Weight 1.873
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Final Payload Design
In our mission, the desired direction will be a GPS transmitter on the ground with the receiver in the probe. The goal is to have the GPS guide the probe using the systems on board to “Home base” which will be the launch pad. The scientific significance of this UAV is to introduce a convenience factor into recovery of rocket parts that have implicated the same hardware as this UAV will have.
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Assembly
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Nosecone
• Characteristics– Von Kármán (LD-
Haack)– 5.5:1 Fineness
• Communications– BRB 900 GPS
Transmitter– Antenna
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Transition Assembly
• Components– 2 6-inch bulkheads
– One small step for man
– One 6-inch diameter polycarbonate plate
– One GoPro camera
– Two eyebolts
• Material– Alumium case
• Dimensions– Length – 6”
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Avionics• Components
– Perfectflite StrattoLogger
– Featherweight Raven
• Concept of Operation
– Activated by external key switches
– Primary charge fired by both altimeters
– Secondary charge fires 5 seconds later by Raven
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Functional RequirementsSystem Subsystem Requirement
Nosecone with payload bay
Primary System • Reduce drag force• Must not deform under flight loading• Mount drogue parachute• Couple with Sustainer
Communications Array • Transmit GPS location to Ground Station
Transition Primary System • House recovery and avionics bays• Must not deform under flight loading• Couple to payload bay• Couple to Booster
Recovery Systems • Tethers the Nosecone and Booster together
Avionics Bay • House Flight Computers• Mount Ejections Charges• Allows space for video camera
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Functional RequirementsSystem Subsystem Requirement
Booster Primary System • House motor mount tube• Fin Mounting• Couple to Sustainer• Must not deform under flight loading• Transfer fin moment
Fins • Stabilize vehicle for flight• Must not deform under flight loading
Motor Mount Tube • Transfer axial motor thrust load• Mount Parachute to Engine Block• Retain motor• Allow quick installation of motor
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Schedule
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Outreach
• Previous Activities– Engineering Week– Astronomy Day– Lockheed Martin Space Day
• Current Collaboration– Water rocketry– Hosting Robotic Competition– Connect a Million minds
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