A short historical review of active noise control is followed by brief discussions of the physical principles and basis concepts of technical realisations, grouped by the geometrical system topology (one-dimensional, local and three-dimensional control). The Section on active vibration control starts, again, with historical remarks, followed by examples of technical applications to active mounts, buildings, active and adaptive optics and sound radiation control by structural inputs. The Chapter ends with a discussion of active flow control and some statistical data on publications in the field of active controls.

Inspec keywords: vibration control; active noise control; flow control

Other keywords: active flow control; active optics; commercial product; laboratory curiosity; active noise control; active mounts; active sound control; geometrical system topology; adaptive optics; buildings; sound radiation control; active vibration control start

Subjects: Acoustic noise, its effects and control