The branch investigates the noise generation at aircraft and vehicles and develops noise reduction technologies. For this purpose, on the one hand numerical simulation codes are being developed and employed, on the other hand experiments are conducted in aeroacoustic wind tunnels as well as in flyover tests.
Main fields of research:
AWBAeroacoustic Wind tunnel Braunschweig, cross section 1.2x0.8 m2, Umax="65" m/s, anechoic chamber, external pressure supply for jets and flow control, source localization with elliptic mirror and stationary or directional microphone array, free field microphones, wind tunnel balance, hot wire anemometry and PIV flow field measurement.
Wide area wireless ground microphone systemSystem of 30 remote controlled noise measurement stations equipped with max. 2 microphones each for the measurement of the directional sound radiation of aircraft as well as the direct measurement of noise contours.
PIANO CAA Code for the numerical solution of inviscid perturbations about RANS flow fields for the computation of sound generation and sound propagation in flows. Advanced stochastic 4D turbulence modelling for highly efficient simulation of sound sources at aerodynamic geometry components (usually not for complete aircraft) and in the near farfield.
APSIM Ffowcs-Williams & Hawkings (and Kirchhoff) solver for the computation of the sound radiation in uniform flow on the basis of unsteady CFD/CAA data on aerodynamic surfaces or source- enclosing closed fluid surfaces: usually for farfield prediction.
SHADOWRay-Tracer with diffraction correction due to Maggi/Rubinowitz for the computation of acoustic installation effects at complete aircraft geometries.
BEMPARacoustic boundary element code for triangulated surface meshes.