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Technical Acoustics

Braunschweig

A320 ATRA with various noise-reducing attachments, © DLR. All rights reserved

Research on sound generation and reduction of noise sources at aircraft

In the department of Technical Acoustics we investigate the sound generation at aircraft and we develop technologies to reduce respective sources of noise. This concerns community noise as well as interior, i.e. cabin noise. 

Competencies

The tools for our research comprise in house prediction methods as well as acoustic wind tunnels and flyover tests. Depending on the particular problem our work ranges from basic research, e.g. on the mechanisms of aerodynamic sources of sound, over development of technologies in generic experiments and numerical simulations up to the testing of more advanced technologies in flyover experiments. Concurrent main areas of research comprise airframe noise which occurs due to the interaction of turbulent flow with aircraft components like high lift systems or landing gears. Another important research activity is related to installation noise. These are sources of sound generated by the aerodynamic interaction of aircraft components, e.g. when the turbofan jet hits the deployed flap. We also are engaged in studying concepts for silent aircraft, which configurationally exploit sound shielding. The department also develops advanced prediction methods for aerosound and the excitation of cabin noise. On top of that we serve as an institution for noise certification of propeller aircraft according to ICAO Annex 16, Volume 1, Chapter VI, X, XI.

Research main topics

  • Prediction of airframe noise: semi-empirical to highly resolving numerical simulation methods
  • Technologies for the reduction of airframe noise: generic studies up to flyover tests on high lift systems and landing gears
  • Prediction of installation sources of noise by means of highly resolving numerical simulation methods and non-empiric physical modeling approaches
  • Technologies for the reduction of installation sources, e.g. by re-shaping and/or use of porous materials
  • Development of efficient numerical simulation methods for aeroacoustics (CAA)
  • Experimental investigation of the excitation of cabin noise
  • Advanced semi-empirical and numerical prediction methods for the excitation of cabin noise
  • Technology transfer, e.g. to noise prediction of ventilation fans

Contact
Prof. Dr. Jan Werner Delfs
Head of Department

German Aerospace Center

Institute of Aerodynamics and Flow Technology
, Technical Acoustics
Braunschweig

Tel.: +49 531 295-2170

Fax: +49 531 295-2320

Related Articles
Lectures in Aeroacoustics - TU Braunschweig
Projects
LEGATO - Investigation of methods for reducing flow-around noise on aircraft landing gears
AACID - Estimation of the noise and risk potential of city drones
HiLiNo - Experimental and numerical quantification of slat noise on high-lift systems
IndiAna Wind - Development of powerful and quiet airfoils with high relative thickness
LNATRA - Retrofittable technologies for aircraft noise reduction
SIAM - Development of a low-noise commercial aircraft
UHBR2Noise - Cabin noise due to fuselage excitation
Research Facilities
Aeroa­cous­tic Wind Tun­nel Braun­schweig (AWB)
Low-Speed Wind-Tunnel Braunschweig
Related Topics
Acoustics
Aircraft Design, Testing and Performance
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