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Aircraft noise generation and assessment

Advanced low-noise aircraft configurations and their assessment: past, present, and future
  • Z. S. SpakovszkyEmail author
Review Paper
  • 27 Downloads

Abstract

Aircraft noise remains the key inhibitor of the growth of air transportation, but the focus of the noise mitigation strategies has changed. As the propulsor fan pressure ratio is decreased for improved fuel burn and lessened environmental impact, the propulsion system noise can be reduced near or even below the noise level of the airframe. Jet noise has become less of a concern, and during approach and landing, the acoustic signature is predominantly set by the airframe. Novel aircraft concepts and architectures, enabled by distributed, more integrated, and boundary-layer ingesting propulsion systems, pose new aeroacoustic problems which require innovative approaches and call for teaming and collaboration as the technological challenges cut across disciplines. One past example of such a collaborative research effort was the Silent Aircraft Initiative (SAI), aimed at the conceptual design of an aircraft imperceptible to the human ear outside the airport perimeter. The initiative brought together researchers from academia, industry, and government agencies. This chapter gives a brief summary of the Silent Aircraft Initiative, the SAX-40 aircraft design, and the noise reduction technologies which were pursued. A decade past SAI, novel aircraft architectures such as the D8 double bubble aircraft, the outcome of a joint effort between MIT, Aurora Flight Sciences and Pratt and Whitney, are being pursued in the quest of reducing the climate impact of aviation. With regulations continuing to reduce the allowable aviation noise emission levels, both new challenges and new opportunities are emerging. Electric, hybrid, and turbo-electric aircraft concepts are currently being investigated as potential game changers. Independent of the level of electrification, noise will remain a major issue as air transportation is growing and mobility might become a key driver. The chapter discusses a selection of enabling technologies and their implications on acoustics and noise and gives a perspective on future trends and new directions in aeroacoustics required to address the challenges.

Keywords

Aircraft noise Advanced concepts Turbomachinery noise Shielding Boundary-layer ingestion 

Notes

Acknowledgements

The work described in this chapter has resulted from contributions of a number of individuals, many of whom are co-authors of the referenced papers. In particular I would like to express my sincere thanks to Dame Ann Dowling at Cambridge University and Edward Greitzer at MIT, the two leads of the Silent Aircraft Project, to James Hileman, my co-Chief Engineer on the project, and to all the students, post-docs, researchers, and industry collaborators involved. The research described in this chapter was funded by the Cambridge-MIT Institute (CMI), NASA Langley Research Center, and the National Institute of Aerospace (NIA). This support is gratefully acknowledged.

References

  1. 1.
    Davies, H.: Airports Commission: Final Report (2015)Google Scholar
  2. 2.
    Thomas, R., Burley, C., Olson, E.: Hybrid wing body aircraft system noise assessment with propulsion airframe aeroacoustic experiments. Int. J. Aeroacoust. 11(3–4), 369–409 (2012)CrossRefGoogle Scholar
  3. 3.
    Manneville, A., Pilczer, D., Spakovszky, Z.: Preliminary evaluation of noise reduction approaches for a functionally silent aircraft. AIAA J. Aircr. 43(3), 836–840 (2006)CrossRefGoogle Scholar
  4. 4.
    Bertsch, L., Heinze, W., Lummer, M.: Application of an aircraft design-to-noise simulation process. AIAA paper AIAA-2014-2169 (2014)Google Scholar
  5. 5.
    Bertsch, L., Wolters, F., Heinze, W., Pott-Pollenske, M., Blinstrub, J.: System noise assessment of a tube-and-wing aircraft with geared turbofan engines. AIAA paper AIAA-2018-0264 (2018)Google Scholar
  6. 6.
    Dowling, A., Greitzer, E.: The silent aircraft initiative—overview. AIAA paper AIAA-2007-0452 (2007)Google Scholar
  7. 7.
    Hileman, J., Spakovszky, Z., Drela, M., Sargeant, M.: Airframe design for silent fuel-efficient aircraft. AIAA J. 47(3), 956–969 (2010)Google Scholar
  8. 8.
    Toyota Prius Specifications, Toyota Motor Sales, U.S.A., Torrance, CA (2005). http://www.toyota.com/prius/specs.html. Accessed 2018
  9. 9.
    Hall, C., Schwartz, E., Hileman, J.: Assessment of technologies for the silent aircraft initiative. AIAA J. Propul. Power 25(6), 1153–1162 (2009)CrossRefGoogle Scholar
  10. 10.
    Hileman, J., Reynolds, T., de la Rosa Blanco, E., Law, T., Thomas, S.: Development of approach procedures for silent aircraft. AIAA paper AIAA-2007-0451 (2007)Google Scholar
  11. 11.
    Sargeant, M., Hynes, T., Graham, W., Hileman, J., Drela, M., Spakovszky, Z.: Stability of hybrid-wing-body-type aircraft with centerbody leading-edge carving. AIAA J. Aircr. 47(3), 970–974 (2010)CrossRefGoogle Scholar
  12. 12.
    Herr, M., Dobrzynski, W.: Experimental investigations in low noise trailing edge design AIAA paper AIAA-2004-2804 (2004)Google Scholar
  13. 13.
    Quayle, A., Dowling, A., Babinsky, H., Shin, H.-C., Graham, W., Sijtsma, P.: Landing gear for a silent aircraft. AIAA paper AIAA-2007-0231 (2007)Google Scholar
  14. 14.
    Khorrami, M., Humphreys, W., Lockard, D., Ravetta, P.: Aeroacoustic evaluation of flap and landing gear noise reduction concepts. AIAA paper AIAA-2014-2478 (2014)Google Scholar
  15. 15.
    Sakaliyski, K., Hileman, J., Spakovszky, Z.: Aero-acoustics of perforated drag plates for quiet transport aircraft. AIAA paper AIAA-2007-1032 (2007)Google Scholar
  16. 16.
    Shah, P., Pfeiffer, G., David, R., Hartley, T., Spakovszky, Z.: Full-scale turbofan demonstration of a deployable engine air-brake for drag management applications. ASME Turbo Expo Paper GT2016-56708 (2016)Google Scholar
  17. 17.
    Drela, M.: Power balance in aerodynamics flows. AIAA J. 47(7), 1761–1771 (2009)CrossRefGoogle Scholar
  18. 18.
    Law, T., Dowling, A.: Optimisation of annular and cylindrical liners for mixed exhaust aeroengines. AIAA paper AIAA 2007–3546 (2007)Google Scholar
  19. 19.
    Defoe, J., Spakovszky, Z.: Effects of boundary-layer ingestion on the aero-acoustics of transonic fan rotors. ASME J. Turbomach. 135, 051013 (2013)CrossRefGoogle Scholar
  20. 20.
    de la Rosa Banco, E., Hall, C., Crichton, D.: Challenges in the silent aircraft engine design. AIAA paper AIAA 2007–454 (2007)Google Scholar
  21. 21.
    Agarwal, A., Dowling, A.: Low-frequency acoustic shielding by the silent aircraft airframe. AIAA J. 45(2), 358–365 (2007)CrossRefGoogle Scholar
  22. 22.
    Ng, L., Spakovszky, Z.: Noise shielding assessment of hybrid wing-body aircraft configurations. AIAA J. 49(11), 2444–2452 (2011)CrossRefGoogle Scholar
  23. 23.
    Crichton, D., de la Rosa Blanco, E., Hileman, J.: Design and operation for ultra low noise take-off. AIAA paper AIAA-2007-0456 (2007)Google Scholar
  24. 24.
    Heath, S., Brooks, T., Hutcheson, F., Doty, M., Bahr, C., Hoad, D., Becker, L., Humphrey, W., Burley, C., Stead, D., Pope, D., Spalt, T., Kuchta, D., Plassman, G., Moen, J.: NASA hybrid wing aircraft aeroacoustic test documentation report. NASA TM-2016-219185 (2016)Google Scholar
  25. 25.
    Hutcheson, F., Brooks, T., Burley, C., Bahr, C., Stead, D., Pope, D.: Shielding of turbomachinery broadband noise by a hybrid wing body aircraft configuration. AIAA paper AIAA-2014-2624 (2014)Google Scholar
  26. 26.
    Doty, M., Brooks, T., Burley, C., Bahr, C., Pope, D.: Jet noise shielding provided by a hybrid wing body aircraft. AIAA paper AIAA-2014-2625 (2014)Google Scholar
  27. 27.
    Thomas, R., Burley, C., Nickol, C.: Assessment of the noise reduction potential of advanced subsonic transport concepts for the NASA environmentally responsible aviation project. AIAA paper AIAA-2016-0863 (2016)Google Scholar
  28. 28.
    Drela, M.: Development of the D8 transport configuration. AIAA paper AIAA-2011-3970 (2011)Google Scholar
  29. 29.
    Uranga, A., Drela, M., Greitzer, E., Hall, D., Titchener, N., Lieu, M., Siu, N., Casses, C., Huang, A., Gatlin, G., Hannon, J.: Boundary layer ingestion benefit of the D8 transport aircraft. AIAA J. 55(11), 3693–3708 (2017)CrossRefGoogle Scholar
  30. 30.
    de la Rosa Blanco, E., Hileman, J.: Noise assessment of the double-bubble aircraft configuration. AIAA paper AIAA-2011-268 (2011)Google Scholar
  31. 31.
    Yutko, B., Titchener, N., Courtin, C., Lieu, M., Wirsing, L., Tylko, J., Chambers, J., Roberts, T., Church, C.: Conceptual design of a D8 commercial aircraft. AIAA paper AIAA-2017-3590 (2017)Google Scholar
  32. 32.
    Lopes, L., Burley, C.: ANOPP2 User Manual. NASA TM-2016-219342 (2016)Google Scholar
  33. 33.
    Beranek, L.: Noise and Vibration Control, pp. 174–180. McGraw-Hill Book Company, New York (1971)Google Scholar
  34. 34.
    Maekawa, Z.: Noise reduction by screens. J. Appl. Acoust. 1, 157–173 (1968)CrossRefGoogle Scholar
  35. 35.
    Nark, D., Burley, C., Tinetti, A., Rawls, J.: Initial integration of noise prediction tools for acoustic scattering effects. AIAA paper AIAA-2008-2996 (2008)Google Scholar
  36. 36.
    Colas, D., Spakovszky, Z.: A Turbomachinery noise shielding framework based on the modified theory of physical optics. AIAA paper AIAA-2013-2136 (2013)Google Scholar
  37. 37.
    Colas, D.: A diffraction integral based turbomachinery noise shielding method. Master’s Thesis, Department of Aeronautics & Astronautics, MIT ( 2011)Google Scholar
  38. 38.
    Kumar, P.Sunil, Ranganath, G.: Geometrical theory of diffraction. J. Phys. 3(6), 457–488 (1991)Google Scholar
  39. 39.
    Nark, D., Envia, E., Burley, C.: Fan noise prediction with applications to aircraft system noise assessment. AIAA paper AIAA-2009-3291Google Scholar
  40. 40.
    Wang, Z., Wu, S.: Helmholtz equation least-squares method for reconstructing the acoustic pressure field. J. Acoust. Soc. Am. 192(4), 2020–2032 (1997)CrossRefGoogle Scholar
  41. 41.
    Tinetti, A., Dunn, M.: Aeroacoustic noise prediction using the fast scattering code. AIAA paper AIAA-2005-3061 (2005)Google Scholar
  42. 42.
    Peters, A., Spakovszky, Z., Lord, W., Rose, B.: Ultrashort nacelles for low fan pressure ratio propulsors. ASME J. Turbomach. 137, 021001 (2015)CrossRefGoogle Scholar
  43. 43.
    Gallagher, K., Goebel, S., Greszler, T., Mathias, M., Oelerich, W., Erogluab, D., Srinivasana, V.: Quantifying the promise of lithium-air batteries for electric vehicles. Energy Environ. Sci. 7, 1555 (2014)CrossRefGoogle Scholar
  44. 44.
    Defoe, J., Narkaj, A., Spakovszky, Z.: A body-force-based method for prediction of multiple-pure-tone noise: validation. AIAA paper AIAA-2010-3747 (2010)Google Scholar
  45. 45.
    Podboy, G., Krupar, M., Helland, S., Hughes, C.: Steady and unsteady flow field measurements within a NASA 22 inch fan model. AIAA paper AIAA-2002-1033 (2002)Google Scholar
  46. 46.
    Hughes, C., Jeracki, R., Woodward, R., Miller, C.: Fan noise source diagnostic test: rotor alone aerodynamic performance results. AIAA paper AIAA-2002-2426 (2002)Google Scholar
  47. 47.
    Defoe, J., Spakovszky, Z.: Shock propagation and MPT noise from a transonic rotor in nonuniform flow. ASME J. Turbomach. 135, 011016 (2013)CrossRefGoogle Scholar
  48. 48.
    Lord, W., Suciu, G., Hasel, K., Chandler, J.: Engine architecture for high efficiency at small core size. AIAA paper AIAA-2015-0071 (2015)Google Scholar

Copyright information

© Deutsches Zentrum für Luft- und Raumfahrt e.V. 2019

Authors and Affiliations

  1. 1.Gas Turbine LaboratoryMassachusetts Institute of TechnologyCambridgeUSA

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