test readiness review reptar1 cu aes senior projects 2016-2017 : reptar trr 10/3/17 team: calvin...

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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

10/3/17CUAESSeniorProjects2016-2017:REPTARTRR2

REPTARProjectStatement&Motivation

REPTARshallassistintherecovery ofade-orbited1URaytheonPayload.ThemissionbeginsoncetheSmallSat hasre-enteredtheatmosphereandhasreachedsubsonicvelocity.REPTARshallfacilitatethesubsonicdeceleration,landing,locationdetermination,andlocationtransmissionportionsofthemission.

Recoveryofpayloadenables:• Lowermissioncostsbyre-usingthepayload• Obtainsamplescollectedbypayloadon-board


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


REPTARMissionTimelineandFBD

10/3/17CUAESSeniorProjects2016-2017:REPTARCDR7

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


RaytheonPayload

ParachuteHousing

GPSAntenna

IridiumAntenna

AvionicsBay30cm

10cm 10cmLegs

SidePanels

REPTARAssemblyAnimation


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.


REPTARExecutiveSummary• ChangessinceMSR:

• Vibrationtesthasbeenremovedfromschedule

• Currentsystemstructurenotfullyrepresentativeofthefinalsystem

• ThermalProtectionSystem

• Payload• Aluminumcoverremovedfromparachutehousing

• TPSisrequiredtoprotectREPTARon-orbit

• Schedule:

• 11daysofmarginincorporatedbeforedroptest

• Budget:

• Allmaterialsin-houseorordered

• DropTestisonlyremainingmajorexpense

• $622.62margin– nooverallconcerns


Schedule


13

SubsystemConfidenceTesting

DeploymentTesting

FullSystemIntegration

FullSystemTestandFinalAnalysis

REPTARTRRtoDropTest

14

SPRING

BREAK!

Budget


TestReadiness


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


REPTARDay-In-The-Life(DITL)– FlightDressRehearsal


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


REPTARFullSystemDropTest


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


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


REPTARExpectedG-Model


ChuteDeployment

REPTARDriftZoneandRecovery


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


Entiredropzoneisaccessibleforrecovery

1.5kmradiusReferenceCircle

REPTARConsequencesTable

10/3/17CUAESSeniorProjects2016-2017:REPTARMSR31

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


REPTARSummaryofConfidenceforDropTest• DescentSystem:• 85%confidenceofparachutedeployment

• LandingSystem:• Highconfidencethatlegsandsidepanelswillproperlydeploy

• 95%confidencetowardsaluminumfoamlandingcharacteristics

• Concernstowardsuncontrollablelandingenvironment

• AvionicsSystem:• Highconfidenceinavionicssystemasdesigned

• Flightenvironmentcanintroduceissuesincommunication

• Overall:• Current:81%confidencethatfullsystemwillperformsuccessfullyindroptest

• Furthertestingtoreducevariance


Questions?


REPTARParachuteDragTest

• Objective:• Determinethecoefficientofdragofgoodandbadparachute

• MeasurementSought:• Force(lbs)andWind(MPH)

• ExpectedValue:• Basedonprovidedinfofrommanufacturer–• Goodparachute~2.2

• Badparachute<2.2

• HowitReducesRisk:• Highercoefficient,lowerlandingvelocity,stayunder40G’sduringlanding

• Toohighofcoefficient,goover40G’sduringdeployment


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


REPTARParachuteDragTest


• Parachuteshockchordwillbeattachedtoropewhichwillbeattachedtoadigitalscalewithhook

• Thedigitalscalewillbeattachedtotherodofaheadrestinacar• Theropewillbeapproximately4metersinlength• Teammemberwillbegintoacceleratecarto13mph• Teammemberinbackseatwillslowlyreleaselineofropeasparachutegetstaut• Carwillstayat13mph,teammemberinbackwillrecorddifferentvaluesofforce

fromscale• Thirdteammemberwillholdanemometeroutwindowandrecordwinddataas

backseatmemberrecordsforce• Comparingthevelocityandforcewillallowcalculationofthecoefficientofdrag

ofparachute• Importantbecauseifcoefficientisoff,landingteammustpreparefordifferent

landingspeed

REPTARBlackPowderTests,NoParachute


• PVCHousingcreatedtoholdejectioncanister• PressuregaugeattachedtobottomofPVCHousing• Highspeedcameraplacedongauge• Canisterconnectedto12V,5Apowersupply• TopofPVCsealeddowntopreventleaks• FromModeltocreate20psiequilibrium,0.128gofpowder

needed• Results:

• Highspeedcamerashowedequilibriumpressureof24psi

• ~17%differenceinexperimentandmodel

REPTARAirCompressorTest


• 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


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


REPTARBlackPowderTestsWithPVCHousing


• 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


REPTARDropTest


• 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


REPTARAluminumPlateLoadTest


• 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


REPTARAluminumPlateLoadTestSolidWorks


48G’sImpulse2”thickplate- 2.84mmDisplacement

48G’sImpulse4”thickplate- 2.15mmDisplacement


• Objective:• Determinedeformationofaluminumplateduetoinstantaneousforcefromparachute

becomingtaut

• MeasurementSought:• Deformationinmmtotwodecimalplaces

• ExpectedValue:• FromSolidWorkssimulations,deformationis2.80mm

• HowitReducesRisk:• Ensuresaluminumplateand/orU-boltdoesnotfracture

• Minimizesdeformationthatcouldaffectantennas



• Results:• Measureddeformationtobe2.43mm

• Errorcouldexistinmethodofmeasuringduetohumanerror

• Errorfromcaliperused

• WhatThisMeans:• Increasedthicknesstominimizedeformation

• Antennashavechanceofbeingslightlyangled

• Aluminumplatewillnotfractureandparachutelost

• 99%confidencealuminumplateand/orU-boltwillfracture


LandingBackup


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


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


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


REPTARLegLockingTesting


• 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%


REPTARLegDeploymentTesting


• Objective• Toachievereliabilitynumbersfordeploymentof

the aluminumfoamlegs


• 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%


REPTARSidePanelDeploymentTesting


• Objective• Toachievereliabilitynumbersfordeploymentof

the machinedaluminumsidepanels


• 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%


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


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


REPTARAvionicsDevelopmentApproach

• SeparateHardwareandSoftwareTesting

• Makealltestablecomponentsindependentlytestable

• Provideasmanyprovenofframps asreasonablypossible

• EGSEcaninterfacetheRaspberryPi2toallComponents

• RaspberryPi3isfirststepforsoftwaretestingalways

• ExtensiveDesignworkonMainboardtoseparatetestableelements


REPTARManufacturingSummary

WorkCompleted:• RevisionAdesignedand

(ordered/received/notordered)


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


Quantity How WhyCoordinatesandtimeofthepointREPTARisdropped

Dropapinusingamapapp

Tocalculatefinaldrift,assistrecovery

Indicatedairspeed Planeinstruments

Tovalidatewindaloftmodelandpredictdrift

OutsideAirTemperature

OATGauge TocalculateTrueAirspeed

PressureAltitude Planealtimeter TocalculateTrueAirspeed

Groundspeed GPS ComparewithTrueAirspeedforWindsVectorCalculation

Groundtrackvsheading

Magneticcompass

Tovalidatewindaloftmodelandpredictdrift

REPTARExpectedDriftModel


REPTARDriftZoneandRecovery


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