Publication

Development of a plasma electroacoustic actuator for active noise control applications

Résumé

Conventional loudspeakers generate sound through the vibration of a diaphragm, attached to a rigid frame through elastic suspensions. Although such construction is satisfactory for sound diffusion in steady environments, it is likely to fail in harsh conditions, which is often the case for active noise control applications. Plasma-based actuators appear to be a promising alternative since they do not involve any fragile moving parts. In this paper, a positive corona discharge actuator in a wire-to-mesh geometry is proposed in the perspective of active noise control applications, as it is capable of generating sufficient sound pressure levels with limited signal distortion. The study introduces analytical and numerical models aiming at characterizing the sound field generated by the corona discharge actuator. The numerical simulation can facilitate the designing of such transducers. The acoustic power of the experimental prototype is increased through the optimization of emitter wires arrangement. The comparison of analytical model and numerical simulation with the experiment is presented. The analytical model successively describes the low frequency sound pressure field, while the numerical simulation is valid in the broader frequency range.

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Concepts associés (32)
Contrôle actif du bruit
vignette|Principe de la réduction active du bruit. Le contrôle actif du bruit ou « antibruit » (en anglais, active noise control abrégé en ANC) est une technique de réduction du bruit par l’utilisation de sources sonores auxiliaires. Le contrôle actif s'oppose à la réduction passive, c'est-à-dire l'isolation phonique par des parois lourdes associées à des matériaux absorbants. Le principe du contrôle actif du bruit consiste à diffuser, par un haut-parleur piloté par un dispositif électronique, une onde sonore qui s'oppose à celle qu'on veut atténuer.
Contrôle du bruit
alt=|vignette| Sonomètre Le contrôle du bruit, sa gestion ou atténuation, sont les efforts déployés, en tout domaine, pour diminuer la pollution sonore et limiter l'impact du bruit, tant à l'extérieur qu'à l'intérieur des bâtiments et autres structures habitées. Parmi les principaux domaines concernés par le contrôle, d'atténuation ou de réduction du bruit figurent : le contrôle du bruit des transports (trafic routier, ferroviaire, aérien, des navires dans les ports, etc), la conception architecturale et l'urbanisme (via notamment des codes de zonage) ou encore le contrôle du bruit au travail.
Noise, vibration, and harshness
Noise, vibration, and harshness (NVH), also known as noise and vibration (N&V), is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks. While noise and vibration can be readily measured, harshness is a subjective quality, and is measured either via jury evaluations, or with analytical tools that can provide results reflecting human subjective impressions. The latter tools belong to the field psychoacoustics.
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