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Wednesday, July 10 • 17:10 - 17:30
EXPERIMENTAL DEMONSTRATION OF ACOUSTIC PLANE WAVE DESTRUCTIVE INTERFERENCE IN RECTANGULAR DUCT WITH A HARMONIC PNEUMATIC SOURCE

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Active control of sound is one of the promising solutions to achieve the reduction of noise in the domain of transport, especially at low frequencies. However, several issues are slowing down the use of this technology, such as the mass of the control actuators or their capacity to generate high-level, single frequency sound. The objective of this study was to demonstrate the efficiency of a harmonic pneumatic source, which is perfectly controlled in amplitude, frequency and phase, to realize the destructive interference of an acoustic plane wave in a duct. The experimental setup is composed of a rectangular duct with a speaker on one side, to generate the sound field to be attenuated. The pneumatic actuator is used on the wall of the duct to create the anti-noise field. Several microphones are installed inside and outside of the duct to achieve the control of sound and measure the attenuation of sound pressure levels. The efficiency of two controls algorithms are compared. The first algorithm is based on the minimization of acoustic pressure inside or outside of the duct. The second algorithm uses a microphone in the near field of the pneumatic actuator and the concept of deported control to minimize far-field sound radiation. This study shows that the destructive interference with this type of pneumatic actuator is effective. Some conclusions and remarks are presented to extend the results for more complex fields.

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 17:10 - 17:30 EDT
Westmount 6
  T02 Act. noise & vib. cntrl., SS01 Actuators & sensors …