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CUAESSeniorProjects2016-2017:REPTARTRR
10/3/17
Team: Calvin Buechler,Kevin Faggiano,Dustin Fishelman,Cody Gondek,LeeHuynh,Aaron McCusker,WilliamSear, Himanshi Singhal,Craig Wenkheimer,NathanYeo
Customer: Steve Thilker,Collin Baukol,Cody Humbargar,JasonLatimer(Raytheon)
Advisor:Dr.BrianArgrow
REPTARREcoverable ProTection AfterReentry
TestReadinessReview
Overview
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REPTARProjectStatement&Motivation
REPTARshallassistintherecovery ofade-orbited1URaytheonPayload.ThemissionbeginsoncetheSmallSat hasre-enteredtheatmosphereandhasreachedsubsonicvelocity.REPTARshallfacilitatethesubsonicdeceleration,landing,locationdetermination,andlocationtransmissionportionsofthemission.
Recoveryofpayloadenables:• Lowermissioncostsbyre-usingthepayload• Obtainsamplescollectedbypayloadon-board
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1)LaunchREPTARcomponentssurvivelaunchconditionsaspayloadattachedtoabus.
MissionConceptofOperations
1
2
2)Orbit/StandbyREPTARComponentssurviveonorbitconditions.Batterieschargedbybus.
3
4
3)De-orbitReceivecommandfrombustopowerREPTARsystems.Re-entryburn.
6)LandandRecoveryREPTARprotectspayloadduringgroundcontactandtransmitlocation.
5
REPTARSolution
Solution
Legend6
5)DecelerationDeceleratetosubsonicspeeds.
4)Re-entryReceivecommandfrombustopowerREPTARsystems.REPTARseparationfrombus.Re-entrycompletedbyRaytheonSystem.
ConceptofOperations(CONOPS)REcoverable ProTection AfterReentry(REPTAR)
ReceiveLocationRecoveryteamreceiveslocation.
DescentAfterbeingdeceleratedtosubsonicspeeds,REPTARactivatesatmosphericdecelerationsystemstoprotectthepayload.
DecelerateSlowstosafelandingspeedsbydeployingaparachute.Transmitslocationduringdescent.
LandLandspayloadsafelywithinlaunchloadingrequirements.
TransmitLocationTransmitslocationtorecoveryelement.REPTAR
REPTARLevelsofSuccessCriteria Volume InstantaneousG-Loading Communication
Level 1Thevolumeof REPTARincludingpayloadshallnotexceedamaximumof6UStandard
Thepayload shallendureamaximuminstantaneousG-loadingoflessthan40G’s
REPTARshallbeaconitslocationover arangeof20miles
Level2Thevolumeof REPTARincludingpayloadshallnotexceedamaximumof4UStandard
--REPTARshallbeaconitslocationover arangeof30miles
Level3Thevolumeof REPTARincludingpayloadshallnotexceedamaximumof3UStandard
--REPTARshallbeaconitslocationover arangeof45miles
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REPTARMissionTimelineandFBD
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On-OrbitStandby• Maintainbatterycharge
ActiveComponent
InactiveComponent
7V4(BATT)12V
AVI_3V3
I2C
GPIOUARTBW_3V3
RF
RaytheonInterface
BatteryCharger
BatteryPack
LaunchInhibits
Avionics3V3Reg. Descent
• Triggeredbybussignal• Determinealtitude• AttainGPSlock
Deceleration[3,500m]• Triggered by parachute
deployment altitude beingreached
• Deploy parachute, bottom panel, andsidepanels.
Transmission• Triggeredbydeployments• TransmitLocation
Altimeter GPS
uController
Black Powder12VReg.
Burn Wire 3V3Reg.
BlackPowderCharge
Kanthal CoilandSpringDeployer (x5)
IridiumBatteryCharger
LaunchInhibits
Altimeter
Black Powder12VReg.
BlackPowderCharge
Burn Wire 3V3Reg.
Kanthal CoilandSpringDeployer (x5)
REPTARKeyComponents
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RaytheonPayload
ParachuteHousing
GPSAntenna
IridiumAntenna
AvionicsBay30cm
10cm 10cmLegs
SidePanels
REPTARAssemblyAnimation
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AvionicsBay
DropTestMeasurementEquipment
LandingLegs
ParachuteHousing
LandingSidePanels
REPTARCriticalProjectElements
Subsystem CPE Explanation
Descent ParachuteDeployment Iftheparachutedoesnotdeployandactproperly,it willbenearlyimpossibletoachieveanyofthemissionrequirements.
Landing Leg Deployment Thelegs lowerthemaximumGloadingthevehicleexperiences.Withoutsuccessfullegdeployment,safelandingwillnotbesatisfied.
Landing SidePanelDeployment Thesidepanelsassist inloweringthemaximumGloadinginthecaseofwindyweatherwherethevehiclewillhaveahorizontalvelocity.
Avionics SubsystemInteraction Ensuringthattheavionics integratewiththeothersubsystemswillbecrucialtosuccessofthemission.
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REPTARExecutiveSummary• ChangessinceMSR:
• Vibrationtesthasbeenremovedfromschedule
• Currentsystemstructurenotfullyrepresentativeofthefinalsystem
• ThermalProtectionSystem
• Payload• Aluminumcoverremovedfromparachutehousing
• TPSisrequiredtoprotectREPTARon-orbit
• Schedule:
• 11daysofmarginincorporatedbeforedroptest
• Budget:
• Allmaterialsin-houseorordered
• DropTestisonlyremainingmajorexpense
• $622.62margin– nooverallconcerns
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Schedule
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13
SubsystemConfidenceTesting
DeploymentTesting
FullSystemIntegration
FullSystemTestandFinalAnalysis
REPTARTRRtoDropTest
14
SPRING
BREAK!
Budget
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TestReadiness
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REPTARPastTesting– DescentSubsystem
Test Measurement Sought RequirementValidation TestTakeaway
Plate Load Deformation duetochutedeployment
Verifiesstructuralintegrityofbaseplate
Plate isstrongenoughtowithstandtheforceofchutedeployment
Drag 𝐶"ofParachute Validatelanding speed
𝐶" forundamagedparachuteiswithin
threshold,𝐶" fordamagedparachute isnot
BP IgnitionAmountofblackpowder
neededtoejectchutefromhousing
Proveschutecan bedeployedusingblack
powder
Parachuteejectedproperly10timesoutof11inchosenconfiguration
REPTARPastTesting– LandingSubsystem
Test Measurement Sought RequirementValidation TestTakeaway
LegandSidePanelDeployment
Percentageof timethatlegsandsidepanelsdeployin6
m/swinds
Validatesreliability ofdeployables
Littleconcernaboutproperdeploymentoflegsand
panels
LegLockingAmountoftorqueneededtoovercomeleglocking
mechanism
Highertorquerequiredtoovercomeleglocking
mechanismmeanslowerlikelihood legsfoldwhen
theyimpactground
Torqueatbreakwas~0.165Nmcausingascrew-indesigntobecreatedfor
ahighertolerance
FoamImpactDeterminecrushing
characteristicsofaluminumfoamlegs
Verifyvehicle canbeslowedtoastopwhilestayingbelow40G’s
Legscompressedalmostexactly asanticipated
REPTARAvionicsStatusDashboard
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REPTARDay-In-The-Life(DITL)– FlightDressRehearsal
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Purpose:ToverifytheintegratedperformanceoftheAvionicsHardwareandSoftware.
DeviationsfromTestFlight:• Black Powder Trigger will be
representativeload• AltimeterReadingsfromEGSE
REPTARParachuteDeployment
10/3/1722
Parachute
U-bolt• SetupDetails:• Verysimilartoflightarticle
• Repeatability:• FollowChecklist Procedure
• RiskReduction:• Increasesconfidencethatchutewilldeploy
• ExpectedResults:• 0.4gofBlackPowdertoEjectChute
• ActualResults:• SuccessfulEjection:10/11=90.9%• SuccessfulCanisters: 34/36=94.4%• OverallConfidenceofDeployment:85.8%
ParachuteHousing
REPTARParachuteDeployment
10/3/1723
FullSystemDropTest
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REPTARFullSystemDropTest
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Scope DropREPTARfromairplaneincontrolledenvironment
• Requiresaircraft,largedropzone
Rationale Fullsystemdroptestistheculminatingtestthatprovidesproofofconceptandfullintegrationtesting
• Testinghighspeedparachutedeployment
• Locationdeterminationduringdescent
• G loadingprofile
RiskReduction
Reducesriskbyvalidatingin-flightperformancebeforerealflightwithexpensivepayload
REPTARDropTestLogistics
• April4th(primarydate)andApril11th(backupdate)• No-godays:Surfacewind ofmorethan 30knots(34.5mph)orcloudclearanceoflessthan
1000ft fromthedesireddropaltitude
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FAA RulesandRegulations:SkydiveColorado
FR.3- Keepsafeduringdescentand
landingFR.4- locatableafterlanding
REPTARDropTestMeasurementUnit• Where?
• Housed where Raytheon Payload would be stored in actualmission
• How?
• Accelerometer(ADXL377,+/- 200Gwithanerrorof1G)
• RaspberryPiCamera
• Quantitiesfromthemainavionics:
• Altitude(Altimeter)
• Location(GPS)
• MassandVolume
• Mass:177gofinstruments+1157gofballast
• Volume:1U
• AdditionalMeasurementswillbetakenfromtheplane
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REPTARExpectedG-Model
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ChuteDeployment
REPTARDriftZoneandRecovery
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MonteCarloParametersInitialVelocity=32.0[m/s]InitialVelocityVariance=5.0[m/s]MinAlt=12500[ft],AltVariance=200[ft]HeadingRange=20[deg]Pos.Variance(x)=500[m]Pos.Variance(y)=500[m]Pos.Shift(x)=-250[m]Pos.Shift(y)=-250[m]WindVel.min=5[kts]WindVel.Variance=5[kts]WindDir.min=230[deg]WindDir.Variance=40[deg]ChuteOpenAltMin=1900[m]ChuteOpenVariance=200[m]StandardDeviation=213.5[m]KnownWinds2520253025402545
REPTARDropZone
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Entiredropzoneisaccessibleforrecovery
1.5kmradiusReferenceCircle
REPTARConsequencesTable
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Quantities Allgolden!
LocationTransmissionFails
LandingFails ParachuteFails Allfail
G'sexperienced 37 37 52 840 840
LocationDetermined? Yes No Likely No No
TimetoLand(s) ~86s ~86s ~86s ~32s ~32s
Datasurvived Yes Yes Yes Likely Likely
REPTARPostFlightAnalysis
Compare:
• G-loadingexperiencedduringflight• Expected driftvsactualdrift• Expectedtimetolandvsactualtimetoland
Review:
• Legdeploymentfootage
10/3/17CUAESSeniorProjects2016-2017:REPTARTRR32
REPTARSummaryofConfidenceforDropTest• DescentSystem:• 85%confidenceofparachutedeployment
• LandingSystem:• Highconfidencethatlegsandsidepanelswillproperlydeploy
• 95%confidencetowardsaluminumfoamlandingcharacteristics
• Concernstowardsuncontrollablelandingenvironment
• AvionicsSystem:• Highconfidenceinavionicssystemasdesigned
• Flightenvironmentcanintroduceissuesincommunication
• Overall:• Current:81%confidencethatfullsystemwillperformsuccessfullyindroptest
• Furthertestingtoreducevariance
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Questions?
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REPTARParachuteDragTest
• Objective:• Determinethecoefficientofdragofgoodandbadparachute
• MeasurementSought:• Force(lbs)andWind(MPH)
• ExpectedValue:• Basedonprovidedinfofrommanufacturer–• Goodparachute~2.2
• Badparachute<2.2
• HowitReducesRisk:• Highercoefficient,lowerlandingvelocity,stayunder40G’sduringlanding
• Toohighofcoefficient,goover40G’sduringdeployment
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REPTARParachuteDragTestCont.
• Results:• Goodparachuten=23,Avg =2.42,Std =0.529
• Badparachuten=32,Avg =2.09,Std =0.553
• WhatThisMeans:• IfparachuteCdis<2.05,landingisover40G’s
• Badparachute,lessthan66%confidentwillbemorethan2.05
• Goodparachute,slightlylessthan66%confidentwillbemorethan2.05
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REPTARParachuteDragTest
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• Parachuteshockchordwillbeattachedtoropewhichwillbeattachedtoadigitalscalewithhook
• Thedigitalscalewillbeattachedtotherodofaheadrestinacar• Theropewillbeapproximately4metersinlength• Teammemberwillbegintoacceleratecarto13mph• Teammemberinbackseatwillslowlyreleaselineofropeasparachutegetstaut• Carwillstayat13mph,teammemberinbackwillrecorddifferentvaluesofforce
fromscale• Thirdteammemberwillholdanemometeroutwindowandrecordwinddataas
backseatmemberrecordsforce• Comparingthevelocityandforcewillallowcalculationofthecoefficientofdrag
ofparachute• Importantbecauseifcoefficientisoff,landingteammustpreparefordifferent
landingspeed
REPTARBlackPowderTests,NoParachute
10/3/17CUAESSeniorProjects2016-2017:REPTARTRR38
• PVCHousingcreatedtoholdejectioncanister• PressuregaugeattachedtobottomofPVCHousing• Highspeedcameraplacedongauge• Canisterconnectedto12V,5Apowersupply• TopofPVCsealeddowntopreventleaks• FromModeltocreate20psiequilibrium,0.128gofpowder
needed• Results:
• Highspeedcamerashowedequilibriumpressureof24psi
• ~17%differenceinexperimentandmodel
REPTARAirCompressorTest
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• Pressuregaugeremoved• U-boltattachedtobottomofhousing• ShockchordofparachutefedthroughhousingandattachedtoU-
bolt• ParachutefoldedinsidePVChousing• Aircompressorattachedtoholewhereejectioncanisterwouldbe• Aluminumfoiltapedovertop• Somepartsofexperimenthadsmallperforationinmiddleoffoil• Results:
• 40psi– slightemergenceofparachutethroughmiddle• 50psi– slightemergenceofparachutethroughsideoffoil• 50psiw/perforation– goodemergenceofparachutethrough
middle• 80psi– verygoodemergencethroughmiddle• 80psiw/perforation– fullydeployedthroughmiddle
REPTARBlackPowderTestsWithPVCHousing• Objective:• DetermineifparachutewilldeployfromPVChousing• Determineamountofblackpowderneededtodeploy• Determineifvelocityofparachuteistohigh
• MeasurementSought:• Amountofblackpowderneededingramsto2decimals• VelocityofparachutedoesnotputREPTARover40G’s
• ExpectedValue:• Amountofpowdertobe>0.10gramswhichisapproximately75psi• 80psiiswhatexpelledparachuteduringcompressortest
• With4kgREPTAR,velocityofparachutemustbe80m/stogoover40G’s• HowitReducesRisk:• Needparachutetodeployinordertobeunder40G’s• EnsuresREPTARstaysunder40G’sduringdeployment
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REPTARBlackPowderTestsWithPVCHousing
• Results:• .1gramspowderpredictedtobe~75psiinstantaneouspressure• Didnothearignitiongooffandnomovementofparachute
• .4gramspowderpredictedtobe~248psiinstantaneouspressure• Parachutelefthousing,videorecorded,burntparachute
• Fromvideo,velocitycalculatedtobe3.29– 4.83m/s
• WhatThisMeans:• ParachutewillnotcauseREPTARtogoover40G’s
• Needtoconductblackpowdertestwithfiberglasshousing
• 0.40gramsshouldbesufficienttoexpelparachutefromhousing
• 99%confidenceparachutewillnotcauseREPTARtogoover40G’s
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REPTARBlackPowderTestsWithPVCHousing
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• PVCHousingwithejectioncanisterinside• ParachuteshockchordattachedtoU-bolt• Parachutefoldedinsideofhousingwithrecoverywaddingbetweenitandejectioncanister• Aluminumfoilwithsmallperforationinmiddleandtapeddown• Canisterattachedtopowersupplywith12Vand5A• Results:
• .1gramspowderpredictedtobe~75psiinstantaneouspressure• Didnothearignitiongooffandnomovementofparachute
• .4gramspowderpredictedtobe~248psiinstantaneouspressure• Parachutelefthousing,videorecorded,burntparachute
• Couldlowergramsandprobablystilldeploy
REPTARBlackPowderTestChecklist
1.Fillcanisterwith0.4gblackpowderandplacerecoverywaddinginside2.Wipedowninsidewithwetrag3.Dryinsidewithdrytowel4.Lightsandingofinsidewith600grit5.LubeinsidewithAerokroil6.Placeejectioncanister7.Feedparachutethroughbottomandconnecttou-bolt8.Screwhousingtowoodandplaceinvisefacing180degrees9.Tapeholesonbackofhousingwithelectricaltape10.2.5sheetsofrecoverywaddingplacedoverejectioncanister11.Lubeupsidesofparachute12.Twistingparachutefoldandfitinsidehousing,pushdowntomakesureparachuteisflushwithhousingsurface13.Connectpowerlinestocanisterlinesandcheckresistanceonotherside14.Connectothersidetopowersupplyandturnonpowerforignition
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REPTARDropTest
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• LinesplacedacrossECOTtogivemeasurementsofdistance• Highspeedcamerasetupwithtwootherteammembers
filming• Cautiontapeplacedtocutoffcourtyardfrombystanders• Parachutewasasinflatedaspossiblebeforedrop• Droppedfrom8th storywindowinsteadof3rd dueto
difficulties• Anemometerongroundgavemaximumreadingof2.2
mph• Driftmodelstated2.2mphwouldprovide4meter
maximumdrift• Troublecommunicatingandensuringsafetyofbystanders• Oncedropped,acceleratedtowindspeedandmovedaway
fromtower• Minimalgooddatawasacquired
REPTARAluminumPlateLoadTestExplanation
• Model:• MATLABsimulationtodetermineG-loading
• Solidworks tocomparedeformation
• Purpose:• Showaluminumplatewithstandsimpulsefrom
parachuteinflation
• Verifymodelandsimulations
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REPTARAluminumPlateLoadTest
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• AluminumplatewillbeattachedtorailingsofCubeSat• U-boltwillbeplacedincenterandscrewedintoplate• ShockchordofparachutewillbeattachedtoU-bolt• Whenparachutedeploysandbecomestautitwillcauseapproximately40G’sor
353lbs offorceonthealuminumplate• Testistoensureplatewillnotfracture/buckle• Platewithrailingswillbesuspendedupsidedown• AchainwillbeattachedtoU-boltandotherendwillholdatenpoundplate• Chainwillbe1meterinlength• Tenpoundplatewillbeheldagainstaluminumplateanddroppedvertically• Ifaluminumplatebreaksitwillneedtobereinforced.Ifnottestisasuccess
REPTARLoadTest:Measurements
• Whatandhowwell?• Deformation:mmtotwodecimalplaces
• DropHeight:intonearest1/16th
• Massofweight:kgtonearestg
• How?• Distancebetweenstraightedgegoingacrossplatetotopofdeformationwithcaliper
• Tapemeasureinprojectsworkshop
• Scalefromcompositeslab
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REPTARAluminumPlateLoadTestSolidWorks
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48G’sImpulse2”thickplate- 2.84mmDisplacement
48G’sImpulse4”thickplate- 2.15mmDisplacement
REPTARAluminumPlateLoadTest
• Objective:• Determinedeformationofaluminumplateduetoinstantaneousforcefromparachute
becomingtaut
• MeasurementSought:• Deformationinmmtotwodecimalplaces
• ExpectedValue:• FromSolidWorkssimulations,deformationis2.80mm
• HowitReducesRisk:• Ensuresaluminumplateand/orU-boltdoesnotfracture
• Minimizesdeformationthatcouldaffectantennas
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REPTARAluminumPlateLoadTest
• Results:• Measureddeformationtobe2.43mm
• Errorcouldexistinmethodofmeasuringduetohumanerror
• Errorfromcaliperused
• WhatThisMeans:• Increasedthicknesstominimizedeformation
• Antennashavechanceofbeingslightlyangled
• Aluminumplatewillnotfractureandparachutelost
• 99%confidencealuminumplateand/orU-boltwillfracture
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LandingBackup
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REPTARFoamLegDropTest• Objective• Toachievelandingvelocities to determine crushingcharacteristicsofa
onelegsetupaswellasG-loadinginaonelegscenarioata5.7m/slandingvelocity
• RequirementDR3.2 Thepayloadshallnot experience instantaneousloading exceeding 40G's
• MeasurementSought• Deformationof foamleginthecompressivedirectionaswellasG-
Loaduponimpact
• Expectedvalue• Expectedtodeform forvalidationofERGAerospace’sprojectedvalue
of70%+ compression• G-Loadingof 11.8G's
• Howitreducesrisk• Providesverificationof design toreduce G-loading belowthe40G
limitrequirement
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8cm
REPTARFoamLegDropTest• Results• Droppedat1.66m± 0.05m
• InitialLegLength: 8.00± 0.05cm
• InitialLegWidth: 1.80± 0.05cm
• FinalLegLength: 2.35± 0.05cm
• FinalLegWidth: 3.60± 0.05cm
• G-Loadingexperienced: 29.2G's
• Whatthismeansforourproject• Thisshowsthattheassumptionofa65%deformationduringcalculationsforareasand
lengthsrequiredforthelegdesigncanbeuppedto70%deformationfollowingthevalidationofERGAerospace’sclaim
• 98%duetotheperformancemeetingexpectationsoffoam,andincreasingareawouldlowerG-Loadingexperienced
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REPTARFoamLeg DropTest
• Using kinematicstheproperheighttodropwasfound• V= V_0+at= 0+ 9.81t
• X= X_0+V_0t+½at^2
• V= 5.7m/s
• Solvingfor Xthe legmustdrop 1.66m toachievetheproperimpactvelocity
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REPTARLegLockingTesting
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• Objective• To determinethepointofbreakageforthe leg
locking mechanism
• RequirementDR3.2 Thepayloadshallnot experience instantaneousloading exceeding40G's
• MeasurementSought• Amountof torqueheldbylockingmechanism
housingwalls
• Howitreducesrisk• Byverifyingtheload requiredtobreak,thedesigncan
bealteredto notallowrotationuponlandingfollowingthelockingofthemechanism
REPTARLegLockingTesting
• Results• Thesetup broke followinga 0.6kgloadappliedattheendofa 16.5cmvicegrip
equatingtoa0.165Nload
• Whatthismeansforourproject• This causedaredesigntoinvolve athickerhousingwallanda screw-insetup forthe
housingwalls
• By changingthedesignit uppedthe confidenceto 99%
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REPTARLegDeploymentTesting
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• Objective• Toachievereliabilitynumbersfordeploymentof
the aluminumfoamlegs
• RequirementDR3.2 Thepayloadshallnot experience instantaneousloading exceeding 40G's
• MeasurementSought• Numberofsuccessful deploymentsinboth no-windand6
m/swindscenarios
• Expectedvalue• 95% deployment successrate
• Howitreducesrisk• Indicatesthe reliabilityofthesedeployments following
extensivetestingfortheironmissiondeployment probability
REPTARLegDeploymentTesting
• Results• Thesetupwastested 40 timesinboththeno-windand6m/swindscenarios and
successfullydeployedinallcases
• Whatthismeansforourproject• This verifiedthedesignof utilizingtorsionspringsandepoxyfordeployment
purposes whilethelegsareattachedtoa slottedpin
• Thisresultprovideda confidencelevelof 99%
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REPTARSidePanelDeploymentTesting
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• Objective• Toachievereliabilitynumbersfordeploymentof
the machinedaluminumsidepanels
• RequirementDR3.2 Thepayloadshallnot experience instantaneousloading exceeding 40G's
• MeasurementSought• Numberofsuccessful deploymentsinboth no-windand6
m/swindscenarios
• Expectedvalue• 95% deployment successrate
• Howitreducesrisk• Indicatesthe reliabilityofthesedeployments following
extensivetestingfortheironmissiondeployment probability
REPTARSidePanelDeploymentTesting
• Results• Thesetupwastested 40 timesinboththeno-windand6m/swindscenarios and
successfullydeployedinallcases
• Whatthismeansforourproject• This verifiedthedesignof utilizingtorsionspringsandepoxyfordeployment
purposes whilethe sidepanels areattached with steelpins
• Thisresultprovideda confidencelevelof 99%
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AvionicsBackup
REPTARAltitudeDeterminationAlgorithm
10/3/1762
EGSETestingComponents:• AltimeterBreakoutBoard• Rasberry Pi3EGSE
FlightTestingComponents:• MainBoard• Raspberry Pi 3 EGSE
(ifMSP430FRdriversfail)
REPTARDeploymentAlgorithm
10/3/1763
EGSETestingComponents:• N/A
FlightTestingComponents:• MainBoard• EGSE(ifMSP430FRdriversfail)
REPTARLocationDetermination/TransmissionAlgorithm
10/3/1764
EGSETestingComponents:• IridiumRockBlock• VenusGPS• Rasbperry Pi3EGSE
FlightTestingComponents:• MainBoard• Rasberry Pi 3 EGSE
(if MSP430FRdriversfail)
REPTAR3V3InternalRegulator
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ResponsibleFor:• ProvidingpowertoGPS,Iridium,and
MSP430FR
HardwareTests:• VerifyAbsoluteVoltageAccuracy(+-5%)
• VerifyVoltageRipple(<300mV)
• VerifyCurrentDraw(2AMax)
SoftwareTests:• N/A
Off-ramps:• Hardware:COTSDev.Board
REPTARAltimeter
10/3/1766
ResponsibleFor:• AltitudeDeterminationwithMSP430FR
HardwareTests:• AltimeterCorrectlyMounted
• VerifyAltimeterAccuracyviacomparisontoknownstandardbarometer
SoftwareTests:• VerifyI2CInterface
• VerifyAltitudeCalculation(MSP430FR)
• FlightTest
Off-ramps:• Hardware:COTSDev.Board
• Software:RaspberryPi2EGSE
REPTARGPS-IridiumInterface
10/3/1767
ResponsibleFor:• DeterminingandTransmittingLocation
HardwareTests:• CorrectElectricalConnections
• Internal3V3RegulatorTesting
SoftwareTests:• VerifyUARTCommunicationtoeach
• VerifyParsingCode
• FlightTest
Off-ramps:• Hardware/Software:RaspberryPi2EGSE
REPTARBlackPowderTrigger
10/3/1768
ResponsibleFor:• ParachuteDeployment
HardwareTests:• PowerSensorVerificationviaknown
Standard
• TriggerLogicVerification
• 12VRegulatorPowerVerification
SoftwareTests:• TriggerlogicVerification
Off-ramps:• RaspberryPi3EGSE
REPTARKanthal CoilTriggers
10/3/1769
ResponsibleFor:• SideandBottomPanelDeployment
CriticalHardwareTests:• PowerSensorVerificationviaknownStandard
• TriggerLogicVerification
• 3V3RegulatorPowerVerification
CriticalSoftwareTests:• TriggerlogicVerification
Off-ramps:• RaspberryPi3EGSE
REPTARAvionicsDesignChanges
• TrimmeddowncomplexityofMainBoardRevisionA
10/3/17CUAESSeniorProjects2016-2017:REPTARMSR70
REPTARAvionicsDevelopmentApproach
• SeparateHardwareandSoftwareTesting
• Makealltestablecomponentsindependentlytestable
• Provideasmanyprovenofframps asreasonablypossible
• EGSEcaninterfacetheRaspberryPi2toallComponents
• RaspberryPi3isfirststepforsoftwaretestingalways
• ExtensiveDesignworkonMainboardtoseparatetestableelements
10/3/17CUAESSeniorProjects2016-2017:REPTARMSR71
REPTARManufacturingSummary
WorkCompleted:• RevisionAdesignedand
(ordered/received/notordered)
10/3/17CUAESSeniorProjects2016-2017:REPTARMSR72
FutureWork:• (Solderanyadditional
components?)
• ValidateRevisionAanddecideifaRevisionBisnecessary
• ContinuedownTestPathsforsubsystemvalidation
• IntegrateMainBoardinREPTARstructure
73
DescentKeyItemsBought Price
Parachutex2 $388
BlackPowder $30
EjectionCanisters $108
FiberglassTube $77
FiberglassCloth $44
FiberglassSheets $59
Epoxy $112
Other $134
KeyNumbers
EstimatedCost $897.00
TotalCost $951.90
Under/Over -$54.90
LandingKeyItemsBought Price
SidePanels $293
AluminumLegs $606
Springs $34
Pins $92
AluminumFoam $92
Epoxy $94
Aluminum $166
Other $67.15
KeyNumbers
EstimatedCost $1,444.15
TotalCost $1,418.93
Under/Over $25.22
AvionicsKeyItemsBought Price
RevA $76
AltimeterBreak $39
Battery Recharger $123
IridiumAntenna $33
RaspberryPi3 $40
VenusGPSSMA $50
RockBlock $294
Other $951.45
KeyNumbers
EstimatedCost $1,087.90
TotalCost $1,606.45
Under/Over -$518.55
Estimated Cost TotalCost DropTest Under/Over Margin
$3,429.05 $3,977.38 $400.00 -$948.23 $622.62
REPTARIn-planemeasurements
10/3/17CUAESSeniorProjects2016-2017:REPTARTRR74
Quantity How WhyCoordinatesandtimeofthepointREPTARisdropped
Dropapinusingamapapp
Tocalculatefinaldrift,assistrecovery
Indicatedairspeed Planeinstruments
Tovalidatewindaloftmodelandpredictdrift
OutsideAirTemperature
OATGauge TocalculateTrueAirspeed
PressureAltitude Planealtimeter TocalculateTrueAirspeed
Groundspeed GPS ComparewithTrueAirspeedforWindsVectorCalculation
Groundtrackvsheading
Magneticcompass
Tovalidatewindaloftmodelandpredictdrift
REPTARExpectedDriftModel
10/3/17CUAESSeniorProjects2016-2017:REPTARTRR75
REPTARDriftZoneandRecovery
10/3/17CUAESSeniorProjects2016-2017:REPTARTRR76