Supervision: Etienne Rivet

Project type: Semester project (bachelor) Semester project (master)

Finished

The electroacoustic absorber is an electroacoustic device allowing the control of the acoustic impedance of a loudspeaker diaphragm, in order to absorb sound energy in the low-frequency range (eg. for room modes damping). Shunting the electrical terminals of a loudspeaker with a dedicated electrical circuit achieves a transformation of the sound energy into electrical losses, resulting in sound absorption. Therefore, the device could also be employed as a voltage source in an electrical energy harvesting disposal.

The proposed work will consist in identifying the design parameters that would optimize the electrical recuperation, that should be manifold: identification of a realistic acoustic situation (nature of the noise source? in a room or in a duct?), optimization of the loudspeaker driver, mechanical components, acoustic enclosure and eventual acoustic filters, electrical shunt, electrical storage. At the end of the modelization study, an optimal prototype design will be identified and a demonstrator will be build to assess the performances of the whole system.

Profile: Electrical engineering, Micro-engineering, Physics, Mechanics

Prerequisites: Electroacoustique (BA5) or Audio Engineering (MA1) Context: Theory (40%), design (40%), measurement (20%)