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Wednesday, July 10 • 18:10 - 18:30
LOUDSPEAKERS OPTIMISATION FOR ACTIVE CONTROL OF TROMBONE RADIATION

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This research work deals with the active control of the sound radiated by a brass instrument. The general goal is to reduce the radiated sound level without altering the input impedance of the instrument. This paper focuses only on the active control of the radiated power. The control is performed by several loudspeakers located outside close to the bell. In order to choose control loudspeakers, measurements of the pressure field produced by a trombone played by a non-professional musician are carried out. This enables to estimate the properties of the equivalent point source of the trombone (volume velocity and position) for different frequencies and levels. Knowing the volume velocity delivered by the control loudspeakers, maximum excursions and input electrical powers are deduced for various loudspeakers types. A dedicated type of loudspeakers is chosen to perform the control. The trombone radiation is modelled by a point source (the interior acoustic field of the trombone is not studied). Considering a lumped element model of the suitable control loudspeakers, the optimal control is applied to determine the pressure field radiated by the bell with analytical models (4 control sources in the shape of a tetrahedron).

Moderators
BG

Bruno Gazengel

Professor, Laboratoire d'Acoustique de l'Université du Mans
MM

Manuel Melon

Professor, LAUM / LE MANS Université

Authors

Wednesday July 10, 2019 18:10 - 18:30 EDT
Westmount 6
  T02 Act. noise & vib. cntrl., SS01 Actuators & sensors …