An active noise control system on air ducts was recently proposed. In this paper, two new systems are presented which being the evolution of the former, have higher performances. The first one is physically identical to the previously proposed system, but it employs another electronic control procedure, so that the noise reduction is considerably increased. The second system shows a really new shape, as it consists of a single loudspeaker which acts both as sensor and actuator. This second one would be less expensive and easier to install but, at the moment, its performances are less efficient than the two loudspeaker system. A maximum reduction of about 1.5 dBlin on the total noise level has been measured. However, a theoretical reduction of about 3 dBlin has been proven, so that improvements of the system are expected which would make it considerably attractive.
Noise Control on Air Ducts: Evolution of Active Systems and Perspectives
COTANA, Franco;ROSSI, Federico;
1993
Abstract
An active noise control system on air ducts was recently proposed. In this paper, two new systems are presented which being the evolution of the former, have higher performances. The first one is physically identical to the previously proposed system, but it employs another electronic control procedure, so that the noise reduction is considerably increased. The second system shows a really new shape, as it consists of a single loudspeaker which acts both as sensor and actuator. This second one would be less expensive and easier to install but, at the moment, its performances are less efficient than the two loudspeaker system. A maximum reduction of about 1.5 dBlin on the total noise level has been measured. However, a theoretical reduction of about 3 dBlin has been proven, so that improvements of the system are expected which would make it considerably attractive.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.