CONTENTS
August 2006
| Vol 34 No 2 |
CONTENTS |
August 2006 |
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
Nicole Kessissoglou
Future Meetings
News
FASTS
Standards Australia
New Products
New Members
Book Reviews
Diary
Acoustics Australia Information
Australian Acoustical Society Information
Advertisers Index
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.