Download - Team Overview
University of Nebraska - Lincoln
Advisors
Team Overview
MissionDesign and build a launch vehicle to reach an altitude of
5,280-Feet AGLDeploy Scientific payload Recover all components in a reusable condition
Management
Team Leaders
Faculty AdvisorDr. Kevin Cole
NAR/TRA MentorThomas Kernes
Project DirectorMatthew Mahlin
Safety CoordinatorPaul Kubitschek
Outreach Coordinator
Bryan Kubitschek
Airframe TeamPaul Kubitschek
Avionics TeamAlyssa Koch
Payload TeamAlexandra Toftul
Propulsion TeamSydney Schaaf
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University of Nebraska - Lincoln
Mission Profile
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University of Nebraska - Lincoln
Preliminary Design Discussion
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University of Nebraska - Lincoln
Vehicle Overview - Deimos
Length: 124.5”Diameter: 5.5”
Nose Cone: 27.5” Von Kármán (LD-Haack), 1:5 Fineness Fin Span: 14.5” (3-fin configuration)
Weight: 26.5 lbs (No Motor – No Payload – Estimated)Motor Mount: 98mm 37” long – rear retaining ring
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University of Nebraska - Lincoln
Stability CharacteristicsOpenRocket ModelWill need to be verified
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University of Nebraska - Lincoln
Plans for Vehicle Safety
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Risk Consequence Precautionary Measures
Contact with Hazardous Chemicals and Materials
-Bodily Injury: Irritation, burns, and allergic reaction-Work stoppage
-Material Safety Data Sheets of all hazardous chemicals and materials will be available to and reviewed by all members. -Facilities with fume hoods will be used for caustic materials.-Protective equipment including, but not limited to, gloves, safety glasses, and filtered face masks.
Misuse of Power Tools -Bodily Injury: Cuts, Abrasions, and Bruises-Work stoppage
-Instructions will be given prior to student use of equipment.-Experienced technicians or upper classmen must be present for all machining.
Unintentional Ignition of Igniters or Electric Matches
-Bodily Injury: Minor Burns-Fire-Lose of critical supplies
-All electric matches will be shorted together at their ends.-Proper storage in secure grounded case
Unintentional Detonation of Black Powder
-Bodily Injury: Serious Burns, and hearing loss
-Ejection charges will be filled last with flight computers deactivated. -Handlers will wear work gloves and Ear Plugs.
Unintentional Ignition of Motor -Bodily Injury: Serious Burns, Bruises, Loss of Life-Cancellation of Flight-Property Damage
-All motors stored unloaded without igniters.-Prepared motors will not be loaded with igniters until mounted on pad.-Loading must be supervised or performed by Certified personnel.
Component Damage Through Testing
-Increased costs-Project Delays-Redesigns
-Grounded equipment used when handling sensitive electronics.-Wearing necessary and precautionary safety equipment.-Only required personnel allowed in proximity to components during testing.-Checklists utilized to ensure proper procedures during operation.
Launch and Recovery Problems -Loss of Vehicle-Loss of Payload-Serious Bodily Injury or Death-Property Damage
-Following TRA/NAR Safety Code-Use of checklists.-Cancellation of Launch in event of adverse weather conditions.-All personnel must be at safe distance before ignition system is armed.
University of Nebraska - Lincoln
Launch CharacteristicsCandidate Motor
Aerotech L1120W-P75mm motor
Simulation Parameters12 foot guide rail
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University of Nebraska - Lincoln
Functional Requirements
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System Subsystems Functional RequirementNosecone Primary System
Communications Array
-Reduce drag force -Must not deform under flight loading-House communications array-Mount drogue parachute-Couple with Sustainer-Transmit GPS location to Ground Station
Sustainer Assembly
Primary System
Recovery Systems
Avionics Bay
-House recovery and avionics bays-Must not deform under flight loading-Couple to Nosecone-Couple to Booster-House Drogue Parachute-House Main Parachute-House Payload-House Flight Computers-Mount Ejection Charges-Allow external access-Mount both parachutes to bulkheads
Booster Assembly Primary System
Fins
Motor Mount Tube
-House motor mount tube-Fin Mounting-Couple to Sustainer-Must not deform under flight loading-Transfer fin moment-Stabilize vehicle for flight-Must not deform under flight loading-Transfer axial motor thrust load-Mount Parachute to Engine Block-Retain motor-Allow quick installation of motor
University of Nebraska - Lincoln
Launch Vehicle Verification
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Subsystem Test Plan Verification Metric Target Date
Altimeter Accuracy
-Subscale Test flights -Agreement between altimeters
January 2012
Recovery System Deployment
-Ground Simulation-Test flights
-Components ejected forcefully-Visually confirm deployment-Vehicle recovered intact
December 2011
Tracking Equipment
-Ground distance test-Test flights
-Line of sight transmission at least 1 mile-Successful tracking after launch
January - March 2012
Motor integration -Test fit-Fit adapter if needed
-No shifting of motor-Motor housed internally
January 2012
Altitude -Full scale test flight for both candidate motors-Add ballast as needed
-Compare recorded altitudes with that of simulations
February – March 2012
University of Nebraska - Lincoln
Vehicle System Overview
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University of Nebraska - Lincoln
Assembly
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University of Nebraska - Lincoln
NoseconeCharacteristics
Von Kármán (LD-Haack)1:5 Fineness
CommunicationsGPS TransmitterAntenna
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University of Nebraska - Lincoln
Sustainer AssemblyComponents
Avionics bay MountingSide Hatch
MaterialBlue TubeFiberglass (8oz)Glass Sock
DimensionsLength - 48 inAV bay length - 12in
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University of Nebraska - Lincoln
Avionics Components
Perfectflite StrattoLoggerFeatherweight Raven
Concept of OperationAccess from Side hatchActivated by external key switchesPrimary charge fired by both altimetersSecondary charge fires 5 seconds later by Raven
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Raven
StrattoLogger
LiPo
LiPo
University of Nebraska - Lincoln
RecoveryComponents
MountingNosecone Tethered to SustainerSustainer Tethered to BoosterForged U-Bolts
Concept of OperationsDrogue @ ApogeeMain @ 2,700-Feet
Component Characteristic Dimension CommentMain Parachute 108” 27ft/s descent rate, 24” Spill hole
Drogue 24” 130ft/s descent rate, X-FormShock Cord 52’ 1” Tubular Nylon
Nomex Wadding 24” Fireproof protection
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University of Nebraska - Lincoln
Booster AssemblyComponents
98mm MMT + Retaining RingFins x 3Coupler
MaterialBlue TubeFiberglass (8oz)Glass Sock
DimensionsLength 48 in
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University of Nebraska - Lincoln
FinsMaterial
5mm thick Tri-PlywoodFiberglass Vinyl Ester Resin
ConstructionLaser cuttingHand sandingVacuum Bagging
AssemblyMounting to MMTBond to boosterTip to tip
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University of Nebraska - Lincoln
Scientific Payload Discussion
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University of Nebraska - Lincoln
Baseline payload design
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University of Nebraska - Lincoln
Baseline payload design
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Subsystem Pre-Flight Test Plan Verification Metric Target Date
Payload Airframe • Drop test Visually verify wind deployment
February 2012
Primary and secondary windbelt
systems
• Detect induced voltage in coils
• Airspeed/resonance relationship
Voltage detected in coil > 30mV and exhibits period structure (not
noise)
December 2011
Active windbelt tension control system
• Interface micro with servo/belt
• Interface micro with anemometer
Frequency of voltage waveform = expected frequency for known
wind speed
January 2012
Sensors and transmitter
• Compare sensor data to know values
• Transmit data
Sensor output values (received data ) w/in 1% of known values
(transmitted data)
January 2012
Power conversion system
• Input several AC waveforms and verify
DC conversion/smoothing
via scope• Measure via micro and compare to scope value
Visually verify smoothed DC
waveform/micro measurement w/in 1% of scope measurement
February 2012
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University of Nebraska - Lincoln
Activity Plans
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University of Nebraska - Lincoln
Major Milestone Schedule
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28 November 2011 PDR report dueBegin construction of UAVFinish construction of UAVBegin testing of UAV systems
5-16 December 2011 PDR Presentation
Evaluate necessary design changesFinish construction of RocketComplete testing of ejection system
January 2012 First Test LaunchVisit local Schools (Park Middle School)Verify Altimeter Accuracy and Agreement
23 January 2012 CDR report due1-10 February 2012 CDR PresentationFebruary 2012 Second Test Launch
Choose competition motor26 March 2012 FRR report due2-11 April 2012 FRR Presentation19-20 April 2012 Flight hardware and safety checks21 April 2012 Launch Day7 May 2012 PLAR due
University of Nebraska - Lincoln
Budget
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Sub-group Item Needed Price # Estimate # Purchased Purchase CostAirframe BT 5.5in 56.95 2 113.9 2 113.9(allocated:$2000) BT Coupler 55.95 1 55.95 1 55.95(Updated 8/31/2011) Kevlar Sock(per ft) 3.51 24 84.24 30 105.22
Glass Sock(per ft) 1.8 16 28.8 25 45.0498 mm MMT 15.47 1 15.47 2 30.9575 mm MMT 14.49 0 0 1 14.495 mm Plywood 4x8 10 1 10 1 11.63All-Thread 6 3 18 1 5.99U-Bolts 5 4 20Misc Hardware 50 1 50Main Parachute 150 1 150Shock Cord 3 50 150Drogue Chute 40 1 40Nosecone Mold 30 1 30
766.36 Current Subtotal 383.17Avionics Flight Computer A 100 1 100(allocated:$1250) Flight Computer B 155 1 155 1 75.5(Updated 8/31/2011) Key Switches 2 0
Arduino 30 1 30Antenna 20 1 20Transciever 70 2 140Electronic Components 25 1 25Radio Beacon 30 1 30
500 Current Subtotal 75.5Payload Ram-Airfoil 75 0(allocated:$2000) Servos 30 6 180(Updated 8/13/2011) Camera 50 1 50
Arduino 40 2 80Sensors 400 1 400Antenna 20 2 40Transciever 70 2 140Misc Components 610 1 610
1500 Current Subtotal 0Propulsion L-Class Motor 200 2 400(allocated:$1000) 75 mm Motor Hardware 300 1 300(Updated 8/13/2011)
840 Current Subtotal 0Outreach Water Rocket Pad 120 1 120 1 100(allocated:$250) Stomp Rockets 50 1 50(Updated 8/13/2011) Misc Supplies 80 1 80
250 Current Subtotal 100Total Estimate3856.36 Current Total 558.67$
Allocated Total: 7,000.00$ Unspent: 6,441.33$
Subtotal Estimate
Subtotal Estimate
Subtotal Estimate
Subtotal Estimate
Subtotal Estimate
University of Nebraska - Lincoln
Outreach• Previous Activities
• Engineering Week• Astronomy Day• Lockheed Martin Space Day
• Current Collaborations• Water Rocketry
• Demonstration• Construction• Launch
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Questions?