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Certification Tool Set Updates Presented by  David Hamilton and Fred Proctor

Certification Tool Set Updates Presented by  David Hamilton and Fred Proctor. NASA Langley Research Center. Hampton, Virginia NASA-FAA-Industry ATDS Workshop #7 Nov 3-4, 2004. Outline. Introduction TPAWS Tool Set Current Status Planned Data Set Enhancements New data set progress

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Certification Tool Set Updates Presented by  David Hamilton and Fred Proctor

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  1. Certification Tool Set Updates Presented by  David Hamilton and Fred Proctor NASA Langley Research Center Hampton, Virginia NASA-FAA-Industry ATDS Workshop #7 Nov 3-4, 2004

  2. Outline • Introduction • TPAWS Tool Set • Current Status • Planned Data Set Enhancements • New data set progress • Summary and Conclusions

  3. TPAWS Tool Set Tool set components, reports, and data set descriptions can be found on TPAWS web site: http://tpaws.larc.nasa.gov/ • Model Data Sets • Hazard Tables • Hazard Metrics • ADWRS • Scoring Tools • for testing airborne systems that are intended to detect turbulence hazard associated with atmospheric convection • useful for evaluation of detection system • available for anticipated FAA certification activity

  4. TASS Governing Equations Momentum: Buoyancy: Pressure: Temperature: Scalars: Subgrid Diffusion:

  5. TPAWS Model Data Sets • Event 191-06 • Severe turbulence encountered at 10.3 km AGL on 14 Dec 2000 during NASA’s TPAWS flight tests. Event associated with overshooting tops of a convective line across FL panhandle. • Data set contains severe turbulence in regions of low radar reflectivity. • FOQA - Wilmington • Severe turbulence encountered by a commercial B-737 at 2.3 km AGL near Wilmington, DE, while on descent. Airliner vectored by ATC into leading edge of shallow convection with tops between 5-6 km. • Data set contains patches of moderate to severe turbulence in regions of low radar reflectivity. • 232-10 • Severe turbulence encountered by NASA’s B-757 during spring 2002 flight test. Encounter occurred in IMC conditions with “ship’s radar” displaying black and green. Exemplifies operational environment in which accidents occur due to turbulence. • Data set contains severe turbulence associated with low-reflectivity regions of rising cloud tops.

  6. RMS acceleration from at 10.3 km Elevation Y (km) Y (km) X (km) X (km) Horizontal Cross-Section of 100 m FLR 191-6 Data Set B737-800 Trim at 170 klbs B737-800 Trim at 100 klbs Max = 0.22 Max = 0.37 B747-400 Trim at 800 klbs B747-400 Trim at 450 klbs Max = 0.41 Max = 0.31

  7. ADWRS Update • ADWRS Version 5.3 just released on TPAWS website • Modified to provide output for different aircraft corresponding to existing hazard tables

  8. Demonstration of Tool Set232-10 Hazard Simulation σΔn= 0.34 g σΔn= 0.39 g Box Method ADWRS/NESPA

  9. Additional Data Sets Planned • Proposed new and enhanced turbulence data sets for sensor development and evaluation. • Need for evolving/dynamic turbulence fields rather than static snap shots. • Fulfill needs for larger data sets at high resolution. • Will use real case events. • Provide more variety of convective turbulence events.

  10. Data Set Enhancements • Major upgrade of NASA Supercomputer capability makes enhanced data sets possible. • NASA Supercomputer Columbia • Installed over the past several months at Ames • Full 20-server system clocked at a sustained speed of 51.9 teraflops (test completed last week) • Beats the computer at the top of a list of the world's 500 fastest machines.

  11. Columbia (SGI Altix):10,240 Intel Itanium-2 processors, storage system holds 440 terabytes of data

  12. Data Set Enhancements (cont.) • Much faster supercomputer provides capabilities to generate turbulence data sets at finer scales with larger domains. • Data volume can be much larger for longer range detection • Resolution can be increased (smaller grid spacing)… along with larger volume

  13. Preliminary Results from New Case • Convective turbulence encountered by two aircraft over Midwest during May. • Associated with line of intense multicell thunderstorms • Atmospheric stability indices indicate strong updrafts and rapidly rising storm tops • Extensive outflow from line of thunderstorms creating an IMC environment • Significant radar reflectivity reaching 45 kft detected by ground radar • Convective cells regenerating underneath aircraft paths

  14. Nexrad with flight paths

  15. ~ 40 km Elevation ~ 1.8 km

  16. Midwest Turbulence Encounter – Preliminary TASS Simulation • Course Resolution Run: • Physical domain size and vertical location • Horizontally: 50 kmx 50 km • Vertically: 17 km AGL • Resolution • 250 meters in all coordinate direction • Plan to run at much finer resolution

  17. Preliminary: TASS Radar Reflectivity at Z= 1.8 km AGL New Data Set

  18. ~ 40 km Elevation ~ 9.5 km

  19. Preliminary: TASS Radar Reflectivity at Z= 9.5 km AGL New Data Set

  20. Run Cloud Simulation Loops

  21. SUMMARY • Tool set includes: • Data sets representing environments where aircraft encountered convectively-induced turbulence • Hazard metric algorithms for data set Analysis/Truthing • Hazard “Look Up” tables • Radar simulation system (ADWRS 5.3) to produce I&Q necessary for load predictions • Tools for evaluating turbulence detection systems • New data sets proposed with larger domains and finer resolution • Tool Set available from TPAWS web site: http://tpaws.larc.nasa.gov

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