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Vol 23 No 1


April 1995


Optimisation of Building Ventilation Opening Size in a Noisy Environment
C Field & F Frlcke
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Vibration Signal Processing Using Matlab
I Howard
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Recent Developments In Australian Occupational Noise Policy
D Waugh
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A System For Real Time Measurement of Acoustic Transfer Functions
J Wolfe
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Acoustics Into the 21st Century
Charles Don
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Optimisation of Building Ventilation Opening Size in a Noisy Environment

Chris Field and Fergus Fricke
Department of Architectural & Design Science
University of Sydney, NSW 2006

Vol. 23, No. 1 pp 5-8 (1995)
ABSTRACT: This paper addresses the problem of achieving noise reduction in buildings that are exposed to road traffic noise while satisfying ventilation requirements. A design process has been developed that optimises the size of an opening in a building for ventilation while estimating the attenuation of external traffic noise inside the building. A fan with associated duct work is fitted to an opening in the building facade to provide ventilation. Therefore the optimisation of the opening size is used to determine the necessary fan characteristics which best suits the opening. The process allows the user to specify particular environmental conditions including traffic noise spectra, required ventilation rates, ventilation fan type, ventilation duct characteristics and building facade properties. Model results are presented indicating an optimum ventilation opening size with the associated internal noise levels. The work is part of a larger study into reducing noise through ventilation openings.

Vibration Signal Processing Using Matlab

Ian Howard
Department of Mechanical Engineering
Curtin University of Technology
Perth, Western Australia

Vol. 23, No. 1 pp 9-13 (1995)
ABSTRACT: Vibration signal processing has traditionally been accomplished using analog and digital signal analysers, or by writing assembler, Fortran or C compiled code. The advent of higher level interpretive based signal processing software products like MATLAB has added a new dimension to vibration signal processing. This paper will outline the application of MATLAB to analysis of the vibration from rotating machinery such as rotors, gears and bearings. Sophisticated signal processing techniques can be developed within a very short period of time given the flexibility and interactive nature of MAT LAB and the range of in-built functions such as Fourier transforms, cubic interpolations and digital filters. The three dimensional colour graphics included in this package provides a sophisticated visualisation capability for the more advanced signal processing techniques.

Recent Developments In Australian Occupational Noise Policy

Dick Waugh
Senior Scientific Officer, Industry Development Branch
Worksafe Australia
GPO Box 58, Sydney, 2001

Vol. 23, No. 1 pp 15-18 (1995)
ABSTRACT: This paper outlines some recent developments in Australian occupational noise policy as indicated in publications of the National Occupational Health and Safety Commission and Australian occupational noise regulations. There has been a gradual change in emphasis over the last twenty years from hearing conservation programs, aimed primarily at protecting exposed workers from hazardous noise, to systematic noise management programs, aimed primarily at achieving reductions in workplace noise.

A System For Real Time Measurement of Acoustic Transfer Functions

Joe Wolfe, John Smith, Gerhard Brielbeck and Fritz Stocker
Musical Acoustics Group, School of Physics,
UNSW, Sydney 2052

Vol. 23, No. 1 pp 19-20 (1995)

Acoustics Into the 21st Century

Charles Don
Vice President, Australian Acoustical Society
Depru tment of Physics, Monash University
Clayton, Victoria 3165

Vol. 23, No. 1 pp 21-22 (1995)
ABSTRACT: What are the requirements to make acoustics a vital force, both at home and overseas, during the next fifteen years? The reply made by the Australian Acoustic Society to a series of questions covering this topic are presented, with the expectation of generating further discussion amongst Society members and thereby creating a broader based response to such challenging questions.

Anita Lawrence

Dennis Gibbings

Vol. 23, No. 1 pp 23-24 (1995)