How$do$Ithink$Research$ - Iowa State...
Transcript of How$do$Ithink$Research$ - Iowa State...
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Audience
This talk is not for absolute geniuses … they don’t need any advice … it is for the 99.99% of the rest (like me) who venture into research
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What’s Genius
Portrait of Thomas Edison
Genius is 1% inspiraKon, 99% perspiraKon
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What’s a PhD
• hMp://maM.might.net/arKcles/phd-‐school-‐in-‐pictures/
Borrowed from: MaMhew Might (Prof. at Univ. of Utah)
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My Background & Research Interests
• Background – 7 years at GE Global Research Center – PhD & MS: Penn State in Aero – BS: IIT Bombay in Aero
• Research interests: – Modeling of aerodynamically generated sound
• Turbomachines: fan / compressors • Wind turbines • Sound propagaKon
– Aerodynamics of wind turbines & farms • Single turbine – wake evoluKon, etc. • Turbine-‐turbine & weather-‐turbine interacKons
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Difference between Industrial & Academic Research
Industry • Problem idenKfied for
you • Imprecise environment
à don’t know everything for a complex system
• Impact à real products
that affect daily lives
Academia • You find the problem • PrisKne/ideal
environment à know everything precisely for a simple system
• Impact can be elusive … distant … but revoluKonary
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It All Begins with an Idea
• Ideas don’t just present themselves … you have to generate them
• Not your adviser … you!
• How does one generate ideas?
A recipe … simple to understand … difficult to implement … sure to succeed
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Five Steps to Idea GeneraKon 1. Gathering of raw material
2. DigesKon of gathered material
3. IncubaKon stage
4. Birth of the idea
5. Shaping & development of the idea
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Step #1: Gathering Raw Material 1. Specific
– Literature review; data; talking to people who have worked in the area
– Cover all bases … can be exhausKng but very rewarding in the end
– Spend a lot of Kme here … much more than you think is saKsfactory
2. General – Read enough about peripheral topics … ideas are a new combina3on
of old things!
Organize your data
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Step #2: DigesKon of Gathered Mtl. • Think like a cow! “MasKcate” the material
• Rephrase each data/paper in your own words … specific contribuKons? AssumpKons? To do items? Gaps?
• Divide gathered material into subgroups … idenKfy themes / trends
• A lot of thinking goes here. Think hard! – Elon Musk: “If your head doesn’t hurt, you are not thinking hard enough”
• As you analyze data you will find more references … – Invariably go back & forth between steps 1 & 2 – At some point you will close the loop (on most items) ... judiciously choose
when to stop
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Step #3: IncubaKon Stage • Conscious to sub-‐conscious brain
• I am sure you have all experienced solving a seemingly tough problem easily aner a break/nap/some other acKvity that took your aMenKon to something else
– Break old links and form new links that lead to problem solving
• Don’t use this Kme to procrasKnate … you need to have done steps #1 & #2 thoroughly to gain anything out of this
• Several half-‐baked ideas will come at this stage … evaluate them objecKvely
and be ready to trash a bunch
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Step #4: The Eureka Moment!
The idea will just pop up in your mind in most unusual of places … at most unusual Kmes!
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Step #5: Shape & Develop your Idea
• Take your newborn idea to the world of reality • Do the necessary work to show your idea has merit
– Proof-‐of-‐concept results – ValidaKon – ApplicaKon
• More of this required in industry where the output is palpable products
• In academia you sKll need this to publish papers, get grants etc.
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Specific Examples
1. Open Rotor noise modeling
2. A novel dual-‐rotor turbine concept
3. Influence of nocturnal low-‐level jets on wind turbine aero & noise
4. Role of wake turbulence in noise
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EXAMPLE #1
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Open Rotor – Counter-‐rotaKng propellers or fans
– Concept proposed & flight tested in 1980s ... “un-‐ducted fan” (UDF)
– ConfiguraKons: • Pusher or puller configuraKon
• Wing or fuselage mounted
Fuselage-‐mounted, pusher configuraKon
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UDF / Open Rotor – History / Future
Borrowed from: hMp://cdn3.chartsbin.com
Open Rotor UDF
killed Jet age begins
Old ideas recycled! shortsightedness … ?
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Step #1: Gathering Raw Material
Material (specific) • 1980s test data:
– Many configuraKons – aero & acousKc data
• PublicaKons • Numerical / analyKcal models
developed earlier
Material (general) • Noise modeling techniques
– For ducted engines • Turbomachinery
aerodynamics AcousKc data sample from 1980s tests
Probably s*ll didn’t spend enough *me on this!
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Step #2: DigesKon of Gathered Mtl.
• What is important & when – Community noise; tonal; during takeoff
• What produces noise – Chopping of upstream bladerow wake/vortex by downstream rotor
• Mechanism linear / non-‐linear? • Near-‐field / far-‐field? • What approximaKons can be made? • Previous methods codes à ignored blade geometry … semi-‐empirical à can’t guide blade design
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Steps #3 & #4: The Idea
Full-annulus FW-H surface
Extract flow data Multi-stage RANS & LinRANS CFD
Far-field Noise
Interaction
noise “sources”
Rotor alone
noise “sources”
• Use linearized, frequency domain CFD methodology for homogeneous inflow – Build upon exisKng capability for ducted engines
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Sample Results
Total pressure field Prediction compared to data Aft bladerow - view looking downstream
-3 -2.8 -2.6 -2.4 -2.2 -2 -1.8 -1.6 -1.4Ton
ePW
LSum
(dB)
10 log10(MT )
5 dB
DataFIT: slope=10.5
PredictionFIT: slope=9.8
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Step #5: Shape & Develop Idea – It took a year to get the first working piece of code … applied to one
baseline geometry
– Performed several calculaKons to show trend predicKon capability
– Refined several things in the sonware for robustness, speed, ease of use etc.
– Published 2 years aner we had all the results … Proprietary concerns!
– Finally, GE AviaKon adopted it in their design process! Success at last
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EXAMPLE #2
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Dual Rotor Wind Turbine Project with Prof. Hui Hu in Aerospace Engineering Idea: miKgate root and wake losses by using an aux. rotor in HAWTs
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Step #1: Gathering Raw Material Material: • Working on root loss quanKficaKon • Lit. review + analyses à root loss ~ 5% performance • Patent / literature search à other concepts (VGs, etc.) • Developed methods to analyze aerodynamic
performance of wind turbines
Certainly didn’t spend enough *me on this!
0
0.2
0.4
0.6
0.8
1
1.2
0.1 0.2 1/3 0.4 0.5 1.0
Coe
ffici
ent
Calculated axial induction factor
aCtCp
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Step #2: DigesKon of Gathered Mtl.
Loads are inevitable … consequence of producing torque – Aero performance ß torque force – Loads ß thrust force
Another means to harness energy near the root region?
Loads Manufacturing TransportaKon
Rotor geometry that is aerodynamically inefficient in the root region
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Steps #3 & #4: The Idea à IDEA: use 2 rotors:
Rotor #1: Extracts energy near the hub Rotor #2: Extracts energy in the outboard region
Another poten3al use:
tailor wake shear à miKgate wake losses
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Step #5: Shape & Develop Idea – Carried out back-‐of-‐the-‐envelope analyses
– Developed numerical framework to design dual-‐rotor turbines
– Discussed with Prog. managers at Iowa Energy Center (IEC) & NSF
– Seed money from IEC … proposal to NSF under evaluaKon … hope will lead to a working product one day
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A TIP
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Become a Weed
Become hardy as weeds … … 1 idea gets thrashed, smile & work towards another
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Conclusion • Read, observe, & analyze a lot!
– When you think you are done, spend 2X more effort – A tall pyramid requires a very wide base
• Understand the raw material – Rephrasing helps – IdenKfy gaps / opportuniKes – Think hard … Kll your head hurts
• Focus on the above two … ideas will come – Roger Federer: “I try to give myself opportuni3es”
• When you get an idea, nurture it … but, don’t get too hung up! – Be ready to throw away ideas upon criKcal, objecKve review. You have many
more in store! – Become a weed!