Conference paper Open Access

Simulator for the reproduction of "Low Sonic Boom"-signatures

Töpken, Stephan; van de Par, Steven

Supersonic aircraft produce a sonic boom when flying faster than the speed of sound. In order to rule out detrimental
e ects for inhabitants of overflown areas, civil supersonic flights (like the Concorde) were allowed to fly over water only.
Due to progress in aircraft design, the super sonic boom may be reduced considerably in the future. Such ”Low Sonic
Boom”-signatures will be considerably quieter and sound completely di erent compared to conventional sonic booms.
Currently, the sensation and the subjective response of humans to future ”Low Sonic Boom”-signatures is not known.
For an assessment of human responses to ”Low Sonic Boom”-signatures, a Sonic-Boom simulator has been built at the
University of Oldenburg as a pressure chamber with a volume of about 9 m3. Two 18” loudspeaker chassis enable the
production of an overpressure of up to 20 Pa for a signature duration of 200 ms. The background noise level in the
chamber is very low (21 dB(A)) and the chamber has a very small reverberation time of T20=0.2 s averaged over octave
bands from 63 Hz to 8 kHz. A vibration platform is installed in the chamber to simulate whole-body vibration that may
occur in connection with ”Low Sonic Boom”-signatures.

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