Acoustics Australia
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An Experimental and Numerical Investigation of the Vibrational Response of a Flanged Cylinder Structure
Acoustics Australia - Tập 45 - Trang 85-99 - 2017
The paper presents a combined experimental and numerical investigation of the
vibrational response of a flanged cylinder structure due to a time-harmonic
point excitation. The principle focus of this study was to (1) determine the
relative sensitivity of the vibrational response of the cylinder due to
variations in the experimental configuration (such as using different
vibrational sources, excita...
Study on Aerodynamic Noise Numerical Simulation and Characteristics of Safety Valve Based on Dipole and Quadrupole
Acoustics Australia - Tập 48 Số 3 - Trang 441-454 - 2020
Design and Validation of a Simulator Tool Useful for Designers and Policy Makers in Urban Sound Planning
Acoustics Australia - Tập 45 - Trang 515-527 - 2017
Currently, the design of the urban soundscapes has been approached from distinct
perspectives, which include, in all cases, the evaluation of how people perceive
sound. An effective way to know how people experience an acoustic environment is
through the use of simulators, where the inhabitants can design and establish
their preferred sound levels. Making these tools available to different urban
s...
Passage of Monochromatic Sound Through a Gas Pipeline Wall
Acoustics Australia - Tập 50 - Trang 119-126 - 2021
On the basis of a rigorous mathematical description of the motion of
monochromatic waves, a method is proposed for determining the acoustic
permeability of a wall containing an arbitrary number of layers. The method is
based on finding exact distributions for incident and reflected waves in each of
the layers under consideration and “stitching” linear combinations of these
distributions at all com...
Comparison of ANN and Analytical Models in Traffic Noise Modeling and Predictions
Acoustics Australia - Tập 43 - Trang 179-189 - 2015
This paper demonstrates the applications of artificial neural networks to
predict the equivalent continuous sound level $$(L_\mathrm{Aeq})$$ and 10
Percentile exceeded sound level $$(L_\mathrm{10})$$ generated due to traffic
noise for various locations in Delhi. A Model based on back-propagation neural
network was trained, validated, and tested using the measured data. The work
shows that the mode...
Normative Framework of Noise Mapping in India: Strategies, Implications and Challenges Ahead
Acoustics Australia - Tập 49 - Trang 23-41 - 2021
The paper presents a retrospective and prospective view of noise mapping
strategy followed across the globe as a diagnostic tool for controlling the
noise pollution in urban cities. The concept of noise mapping is primitive in
India and thus developing the noise maps is really a great challenge for big
metropolitan cities of India. The paper discusses the benefits associated, input
parameters requ...
A Facility for Simulating Room Acoustics, Employing a High Density Hemispherical Array of Loudspeakers
Acoustics Australia - Tập 43 - Trang 77-81 - 2015
Over the past 50 years, upper hemisphere immersive loudspeaker systems in
anechoic environments have supported research into the perception of room
acoustics. A newly completed laboratory facility consisting of an upper
hemisphere 196-loudspeaker array is described, along with available methods to
deploy room acoustics auralization within the facility. With a mean interval of
$$11.5^{\circ }$$ bet...
2D Acoustic Design Sensitivity Analysis Based on Adjoint Variable Method Using Different Types of Boundary Elements
Acoustics Australia - Tập 44 - Trang 343-357 - 2016
Continuous linear and quadratic boundary elements are often applied to numerical
solution. Discontinuous higher-order boundary elements are developed for 2D
acoustic problems to achieve higher accuracy in this paper. The Burton–Miller
formulation is used to overcome the fictitious frequency problem when using a
single Helmholtz boundary integral equation for exterior boundary-value problem.
The st...
Application of Dual-Source Modal Dispersion and Variational Bayesian Monte Carlo Method for Local Geoacoustic Inversion in Weakly Range-Dependent Shallow Water
Acoustics Australia - Tập 51 - Trang 23-38 - 2022
Most of the continental shelf area is a weakly range-dependent shallow-water
environment. Compared with range-independent Bayesian geoacoustic inversion,
range-dependent inversion usually has problems with the complex forward model
and low efficiency for posterior analysis. According to the adiabatic
normal-mode theory, the weakly range-dependent shallow-water environment can be
divided into a ser...
Stage Acoustics in Eight Australian Concert Halls: Acoustic Conditions in Relation to Subjective Assessments by a Touring Chamber Orchestra
Acoustics Australia - Tập 45 - Trang 25-39 - 2017
Although auditorium acoustics has been extensively studied from an audience
perspective, studies of musicians’ preferences on stage are far more limited.
The present work tests and extends the hypothesis, suggested in recent studies
by others, that the directional distribution of early reflected energy on stage
is subjectively important to musicians. The paper presents results of subjective
survey...
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