solar impulse, first round-the-world solar flight€¦ · 1 solar impulse, first round-the-world...
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Solar Impulse, First Round-The-World Solar Flight
Ralph Paul
Flight Test & Dynamics
Solar Impulse
June 21, 2016
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An idea born in Switzerland
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es
BERTRAND PICCARDPSYCHIATRIST-EXPLORER
HANG-GLIDING CHAMPION
GOODWILL AMBASSADOR
1ST ROUND WORLD BALLOON FLIGHT
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es
ANDRÉ BORSCHBERGENGINEER-ENTREPRENEUR
GRADUATE OF MIT
SWISS AIRFORCE PILOT
WORLD’S LONGEST SOLO FLIGHT
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Flight Testing
Ground Tests and Flight Missions
Civil Aviation Certification
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Challenges and Achievements
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December2009 – The
flea hop
July 2010 Solar Impulse Night
Flight
2011 European
SolarFlights
2012 –Crossing Frontiers
2013 –Across
America
April 2014 –Unveiling
Solar Impulse 2
Summer2014 –Test
Flights
2015
The Round-The-World
Solar Flight
TIMELINE
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AS WITH ALL MAJOR
FIRSTS, THERE ARE NO
PAST REFERENCES TO
GUIDE US
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Tail Sizing,
Fuselage Shape
Engine
Position
Wing Dihedral,
Ailerons
Autopilot, Avionics, Inertial Platform
(Automatically Generated Code)
Model-Based Design of the Aircraft
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Where It All Started: Flight Simulation in 2007
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Mission Simulation in 2007
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Flight Simulator in 2008 for 25h Test
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Flight Simulator in 2008 for 25h TestCombined 72h Mission and Flight Simulation 2012 and 2013
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Combined 72h Mission and Flight Simulation 2012 and 2013
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How did we Leverage MathWorks Design Flows
Autopilot
Verified and Validated with
Model-Based Design
Avionics
Verified and Validated
with Polyspace
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Autopilot (Basic Loop) in Simulink
Study to DecideOne Aileron Servo vs. Two Rudder Servos
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Formal Analysis of Avionic Software to DO-178Bapplying Polyspace Bug Finder and Code Prover
> 290k Lines of Code
Power Management / Mission Information Computer→ QNX on COTS Board (x86, 32 Bit, 500 MHz, UNIX RTOS)
Throttle Box, Air Data Computer, Independent Display→ ATMEL on SI Boards (ATCAN90, 8 Bit, 8 MHz, No OS)
Monitoring and Alert System→ ARM on ALTRAN Board (Cortex-M4F, 32 Bit, 168 MHz, No OS)
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– Latent bug or defect hunting, e.g. incorrect temperature in throttle box
– No test cases or compilation needed
Formal Analysis of Avionic Software to DO-178Bapplying Polyspace Bug Finder and Code Prover
While((ADCSRA & (1<<ADSC) == 1)
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Independent, systematic code reviews, compliance to MISRA-C
Complexity results to support DO-178B “simple system” argument for case
where we had to “re-engineer” design assurance level equivalence
Bug Finder and Code Prover provided 1-2 Man-Year savings and
automated capability in parallel to development which were not available
otherwise
Formal Analysis of Avionic Software to DO-178Bapplying Polyspace Bug Finder and Code Prover
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Concluding Remarks
Model-Based Design with MATLAB and Simulink helps us
– Reuse, build, test and fly whilst exploring new ideas and concepts
– Make key design decisions early, saving time and avoiding manually coded errors
– Focus on design and development instead of low-level coding
– Understand the system and its interdependencies
– Validate and verify the final performance including pilot training
– Adapt to new situations in pre- and during- flight
Using Polyspace code verifiers
– Identified and fixed potential run-time errors and unsafe code
– Reliably analyzed C codebase early, without test cases and compilation!
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WHAT WAS ACHEIVED IN 2015
8 FAI WORLD RECORDS 225 FLIGHT HOURS
19,957 KILOMETERS
7 COUNTRIES 8 FLIGHTS
5,644 kWH OF SOLAR ENERGY PRODUCED
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WHAT IS PLANNED FOR 2016
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An idea born in Switzerland