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ContactEmail:flaherty.j@husky.neu.eduPhone:(603)548-6750
linkedin.com/in/joe-flaherty
Design PortfolioJoseph Flaherty
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
AboutMeHi,I’mJoe.Thanksforlookingthroughmyportfolio.Iliketostaybusyatschoolbyalwayshavingasideprojectgoing.Thisdocumentisacollectionofmyfavoritedesignsandbuilds.
WhenI’mnotworkingorsleeping,Iliketorunandkayak.Ialsolovethrowing;beitabaseball,afootball,orevenajavelin.Latelythough,I’vejustbeenskippingrocks.
Here’smeinanutshell:Ilikemakingthings,throwingthings,and(hopefullysomeday)puttingthingsinspace.MydreamcareerwouldhelplandhumansonMars,andI’vebeenstrivingforyearstomakemyselfqualified.
Ihopeyoufindtheseprojectsinteresting.Icertainlyhadfunworkingonthem.
PastEmployers:KayakinginCapeCod
Me
Athomewithmythreesisters
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
DesktopGyroscope• Overview• PrecisiononaBudget• AirSystem
RocketInterstage• Overview• Transition• BlastChamber
DesignProjects
Extras• RocketPayloadCanister• RapidEncapsulationDesign• ReverseEngineeringwithNX• RocketLoader&Launcher
Background:• Inspiredbya1940sairdrivendirectionalgyroscope;reusedtheflywheelanditsbearings• Originally,projectwastobeself-funded,sobudgetwasroughly$100Objectives:• Creategyrothatcanbeeasilyspunupwithasmallbikepumporbyhand• Improveairsystemtoallowfullrotationabout2axes(originalhad±80° pitch)• Satisfytheaestheticandsizerequirementsofadesktopornament/toy
Overview– DesktopGyroscope
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750OriginalGyrofromWWII CompletedDesktopGyro
ExplodedViewinCAD
PersonalProject– YouTubeVideoFundedbyAmericanInstituteofAeronautics&Astronautics June– August2016
PrecisiononaBudget – DesktopGyroscope
CostSavingDesignDecisions:• Optimizedvolumeof3Dprintedpartsbyminimizingwidthandtightly
integratingfastenerholeswithothercavities• Usedjournalbearingsandthrustballbearingstominimizefrictionatlow
cost,thoughsealedballbearingswerepremiumsolutionforairloss• Builtextraroomintojointstocompensateforlargeshafttolerancesand
inaccuratelaser-cutter• Reusedtheoriginalgyro’sflywheelanditscustomballbearings• Gyropurposelynotdesignedtobeheldupsidedown,simplifyingouter
gimbalandassemblyprocess
PersonalProject– YouTubeVideoFundedbyAmericanInstituteofAeronautics&Astronautics June– August2016
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-67503DPrintedParts VolumeoptimizedTfitting
ExplodedViewColoredbyFabricationMethod
Hollowshaftconnectselbowjointandflywheel
AirSystemInnovations:• Airdelivereddirectlythroughshaftaxis,allowingforsimpler,
morecompactdesign• StratasysObjetusedto3Dprintinternalairchannels,nozzles,
andpress-fitinterfaceswithdimensionalaccuracy• PVCTubingroutedthroughlaser-cutacrylicframe,reducing
volumeofexpensive3Dprintedparts• AirinletsizedforaSchraderpump,theUSstandardformountain
bikeandcartires
AirSystem– DesktopGyroscope
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
Fullcross-section;airpathshowninblue
PersonalProject– YouTubeVideoFundedbyAmericanInstituteofAeronautics&Astronautics June– August2016
Overview– RocketInterstage
TeamObjective:• BethefirstuniversityrocketryteamtoreachtheKarmanLine(100kmaltitude)MyTask:• Createasmoothtransitionbetweentherocket’stwostagesof4”and6”diameters• Produceanaffordablesystemthatreliablyconnectsandseparatesthestages• SupportambitiousschedulewithplannedlaunchinMay2016DesignChallenges:• Theinterstagemustwithstandlargebendingloadsandheating
• Analysisteambehindschedule;nostructuralorthermaldesigninput
• Rocketisminimumdiameter(sizeofmotorcasing)• Mustinterfacewithmotornozzleandfincanofupperstage
WithAmericanInstituteofAeronautics&AstronauticsMarch– April2016
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750ExplodedViewofInterstage– seeanimationonYouTube
Blastchambermatedwith2nd stagemotorcasing
Assembledprototypeincollapsedform
Transition– RocketInterstage
TransitionInnovations:• TheshapeofthetransitionisanequationdrivencurvebasedontheVon
Karmanprofile,whichdescribesaconeoptimizedforsupersonicdrag• Askeletonofcarbonfibertubesbearsin-flightloads,allowingthesmooth
transitiontobe3DprintedinUltem:astrong,temperatureresistantplastic• Theassemblyslidesoverthebottom6”oftheupperstage,providingarigid
couplingthatresistsbending• Blastchambercouldberemovedandrocketcouldstillbestagedbydrag
separation
WithAmericanInstituteofAeronautics&AstronauticsMarch– April2016
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
StructuralCarbonFiberTubes
Blastchamber
VonKarmanprofilebegins
SplinetransitiontoVonKarmanprofile
Notionalconnectionto1st stage
Upperstagenozzle
Mountingringconnectsblastchambertostructuraltube
UltemTransition
2nd StageFinCan
BlastChamber– RocketInterstage
BlastChamberInnovations:• Fastandsimplepre-flightassemblyprocess• Nozzlecapinsulatessecondstagemotorfromseparationblast• Secondsetofshearpinssecurenozzlecapandignitertomotorafterstageseparation• Componentsauto-locatetoensureshearpinholesarealigned• BlastChamberisonlyloadedaxially,socomponentsareplastic
WithAmericanInstituteofAeronautics&AstronauticsMarch– April2016
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
RetainerBreakout(black)mountedtoamockupofthesecondstagemotorretainerring(blue) FullyAssembledBlastChamber
RetainerBreakout
NozzleCap&Igniter
BlastChamberCore
ChargeMountingPlate
TransitionMountingRing
SecondStage
PressureSeal
RocketPayloadCanisterwithAmericanInstituteofAeronautics&AstronauticsforNASAStudentLaunchCompetition2017OngoingsinceAugust2016
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
Objectives:• Protectfragilepayloadofunknownweightanddimensionsduringrocketflightto1mileapogee• MentorateamofunderclassmenonachallengingtechnicalprojectAccomplishments:• DerivedanalyticalmodeloffoamimpactandwroteaccompanyingMATLABscripttohelp
youngerstudentseasilyoptimizetheirdesign• Returnsfoamyoung’smodulusbasedongeometryandimpactvelocity• Modelishighlyidealized,butprovidesorderofmagnitudeanswerforearlydesigndecisions
• Designedadjustable3Dprintedpayloadcanister• Intricatethreadedpartsareprintedwithoutsupportsandfullyfunctionalrightoffthebuildplate• Foamcushioningisquicklylaser-cuttosizeandgluedinplace
Displacementplotoffoamabsorbingaradialimpact
CanisterWall(rigid)
RocketBody(rigid)
FoamPadding
𝑈" = 𝐸ℎΔ' ( 𝑟*' − 𝑦'� − 𝑟.' − 𝑦'
� − Δ/0𝑑𝑦
"2
3
𝑈4 =𝐸𝐴𝛿'
2𝐿 ;𝑈; =12𝑚𝑣
'
Strainandkineticenergyequationsthatformthebasisoftheanalyticalmodel
Printedcomponentsofpayloadcanister(heightscaleddown,strapsandfoamnotshown)
InitialCanisterConcept
TopCap(locksthreads)
MainCap(compressespayload)
ElasticStraps(forlong,thinpayloads)
LIDARModuleUltrasoundonadjustablepivot
MainBoard
Battery
MicroUSBportWirestohapticfeedbacksystem
RapidEncapsulationDesign
CapstoneGroup’sObjective:• Createacaneforablinduserthat
provideshapticfeedbackwhenobstaclesaresensed
MyTask:• Deliverfunctionalproductassoonas
possible• Releasedfinaldesigninlessthan24hours
• Mountcircuitboards,sensors,andbatteriesinsmall,robustcase
• Designmountforultrasoundsensorwithadjustablepivot
SkillsDemonstrated:• Deliveryofcompactandfunctional
productinashorttimeframewithnoprototypes
• Managementoftolerancesonlow-accuracy3Dprintedpartswithmultipleinterfaces
ForElectricalEngineeringCapstoneGroupApril10-11,2016
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
EndUserwithCane
ReverseEngineeringwithNX
Note:AllotherprojectsinthisportfolioweredesignedinSOLIDWORKSSelf-TaughtNXSkills:• Reverseengineeredobjectsaroundthehouseto
practicebasicandadvancedtechniquesinNX• Givenlicenseforself-teachingpriortoco-op
• ModelshereweremadewithmerehoursofexperienceinNX
• 7monthsofworkonconfidentialprojectatTytoLifeincreasedskillsfurther
PersonalProjectNXStudentLicenseprovidedbyTytoLifeLLCMay2015
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
M1riflemodeledandrenderedinNX Realaviators(topleft)modeledandrenderedinNX
RocketLoader&Launcher
Objectives:• Createarobottofind,capture,andloadapayloadintoarocket,thenlaunchit• SimulateaMarssamplereturnmissionAccomplishments:• Leddesign,fabrication,andassemblyasasophomorewithlittleexperience• Cheaplyandaccuratelyfabricatedcomplexassemblieswithlasercutplywood• Integratednumerousindependentlymovingsubsystems• Designedlarge80/20frameusingSOLIDWORKSWeldmentsandgeneratedcutlist
withAmericanInstituteofAeronautics&AstronauticsforNASAStudentLaunchCompetition2015November2014– April2015
JosephFlaherty|flaherty.j@husky.neu.edu|(603)548-6750
Lasercutsnaphooks Telescopingpayloadbaywithsnaphooks FullassemblyinCAD
Telescopingpayloadbayatloadingstation
linkedin.com/in/joe-flaherty
ContactEmail:flaherty.j@husky.neu.eduPhone:(603)548-6750
Thanks for ReadingIhopeyouenjoyedlearningaboutmyprojects.Pleasenotethatmuchofmybestworkisconfidential,andeverythingshownhereisaproductofmyfreetime.Whileincomplete,thiscollectionstillcapturesmycontinuingefforttogainexperienceandbecomeabetterengineer.
I’mexcitedtoseewhatprojectsthefuturewillbring.Ifyou’dliketocontactme,pleaseusetheinformationbelow.
Thanksagainforyourtime,
JoeFlaherty
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