Supervision: Rahim Vesal
Project type:
Semester project (master)
Master thesis
Assigned
Active noise control (ANC) relies on the use of loudspeakers as secondary sources, aiming at cancelling out a primary sound sources in a propagating medium, or absorbing noise at one boundary. This technique has been shown to perform very well in ducted environments, where the sound propagation is guided. However, due to the occluding effect of loudspeakers, it is only possible to achieve such ANC with wall-mounted loudspeaker, impacting the performance in terms of achieved noise reduction.
Recently, a Corona Discharge (CD) loudspeaker concept has been developped in the lab, allowing for the first time an almost transparent surface to generate sound, without relying on a (physical) membrane. With this technology, it is possible to envisage new active noise reduction sources that could directly affect the primary sound field, without disturbing the flow of particles (eg. in a ventilation system), or even the visual transprency of the system.
The aim of this project is to assess the performance of a CD loudspeaker as an ANC source inside a 1D duct and optimize the control strategies in terms of sound transmission reduction. It will first consist in modeling the whole system on COMSOL Multiphysics, that will serve in assessing the theoretical performance and potential optimization. Then an experimental prototype will be constructed and assessed in a laboratory impedance tube to confirm the finding.
Content
- COMSOL and/or Matlab simulations
- Electroacoustic measurements
Prerequisite
- BA5-Electroacoustique
- or MA1-Audio Engineering