|Vol 34 No 2||
Active Noise Control: A Review in
the Context of the ‘Cube of Difficulty’
M. R. F. Kidner
Active Noise Control at UWA
— A Brief Review of the Acoustical Understanding and
Practical Application of ANC Systems
Jie Pan and Roshun Paurobally
Sensors and Actuators for Active
Noise Control Systems
Cohn H Hansen
A Review of Active Control
Applied to Plates and Cylinders
Acoustics Australia Information
Australian Acoustical Society Information
Vol. 34, No. 2 pp 65 - 69 (2006)
ABSTRACT: Over the past twenty years active control of noise has developed into a mature research field and into a product for some technical companies. This paper reviews the current state of the art in both the research and development fields using the context of a cube of dfflculty. The cube illustrates how the three physical quantities: frequency bandwidth, spatial extent and signal coherence, contribute to the difficulty of achieving control performance. The literature is reviewed and placed within the cube to reveal patterns in research and areas of further work.
Vol. 34, No. 2 pp 71 - 78 (2006)
ABSTRACT: The design, analysis and realization of Active Noise Control (ANC) systems have been challenges to acoustical and control communities over the last two decades. It is largely due to the effort in the acoustical community and to advances in digital signal processing technologies that significant progress has been made in this field. As part of this international quest in advancing ANC technology, researchers at the University of Western Australia (UWA) have focused on (1) applying an understanding of acoustical systems to the design of ANC systems and (2) the development of practical ANC systems for the Western Australian mining, shipbuilding and building industries. This paper presents a brief review of the contribution to these two areas by the UWA team including the results obtained from several practical applications.
Vol. 34, No. 2 pp 79 - 84 (2006)
ABSTRACT: Successful implementation of an active noise and vibration control system requires an effective control system and a good understanding of the physics of the problem to be controlled. However, there can be no successful implementation without appropriate transducers for transforming acoustic signals into voltages for the electronic control system and for transforming voltages output from the control system into sound. Although a considerable amount of research has been devoted to control algorithms and optimal physical arrangements for sensors and control actuators, little has been written about the requirements for the sensors and actuators themselves. Here a number of practical actuator and sensor implementations are discussed for both fully active and semi active noise control systems.
Vol. 34, No. 2 pp 85 - 92 (2006)
ABSTRACT: This paper presents adaptive feedforward active control applied to simple structures comprised of beam, plate and cylindrical elements. For each system under consideration, by initially obtaining a good understanding of the physics of the structural and acoustic responses, the active control application can be tuned to improve the control performance. In particular, the use of active structural acoustic control to attenuate the structurally radiated sound fields is investigated.