ORCID Profile
0000-0002-7677-5318
Current Organisation
University of Adelaide
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Acoustics and Noise Control (excl. Architectural Acoustics) | Mechanical Engineering | Nanomaterials | Wastewater Treatment Processes | Dynamics, Vibration and Vibration Control | Numerical Modelling and Mechanical Characterisation | Chemical Engineering | Water Treatment Processes | Cell Development, Proliferation and Death | Acoustics and Acoustical Devices; Waves
ANZSRC Socio-Economic Objective (SEO)
Management of Noise and Vibration from Transport Activities | Expanding Knowledge in Engineering | Rail Safety | Rail Freight | Water Services and Utilities |
Related Links
Publications
Steady-state sound propagation through hot exhaust jets in cooler cross-flow: A computational study
Publisher: Acoustical Society of America (ASA)
Date: 07-2023
DOI: 10.1121/10.0020069
Abstract: An analysis has been carried out to investigate the sound radiation through a heated jet in cooler cross-flow, which is representative of many industrial exhaust systems, using a hybrid steady-state computational fluid dynamics and computational acoustic model. The mean flow and temperature fields are modelled using steady-state computational fluid dynamics, with the turbulence modelled using Reynolds Averaged Navier-Stokes equations. The corresponding mean flow and temperature fields are used in the computational sound propagation model using linearised acoustic wave equation with mean flow based on a scalar flow potential. The results obtained from the computational simulations show that the flow significantly changes the sound propagation path and that the sound levels downstream of the duct outlet are higher than expected from using an acoustic monopole radiation pattern. The dominant mechanism affecting the propagation of sound is the refraction arising from the plume's temperature and velocity gradients. The sound propagation is highly dependent on the proximity from the duct outlet, normalised wavenumber, temperature and the jet to cross-flow mean velocity ratio. This computational study builds upon previous experimental work to analyse the fluid-acoustic interaction for heated jets in cooler cross-flow to understand the complex radiation pattern that leads to higher-than-expected sound levels downstream of the duct outlet.
Noise reduction using a quarter wave tube with different orifice geometries
Publisher: Elsevier BV
Date: 02-2014
A nonlinear dynamic vibration model of a defective bearing: the importance of modelling the angle of the leading and trailing edges of a defect
Publisher: SAGE Publications
Date: 10-11-2020
Abstract: Rolling element bearings eventually become worn and fail by developing surface defects, such as spalls, dents and pits. Previous researchers have tested bearings with defects that have sharp [Formula: see text] rectangular edges that were used to develop analytical models of a defective bearing. These models have limitations that require smooth surfaces and constant curvature of the bearing components as well as assuming the defect profile. A method has been created to capture the surface topography of a bearing defect. A numerical model has been developed for a rolling element bearing that uses the measured defect profile and removes the limitations of models by previous researchers that use analytical expressions for contact area and force. The predicted vibration response of a bearing with a defect that has sloped leading and trailing edges on the outer and inner raceway was compared with experimental results. It was found that the new numerical model was able to predict the vibration response of a defective bearing. The defect topographies and the developed model have been made publicly available.
Analyses of contact forces and vibration response for a defective rolling element bearing using an explicit dynamics finite element model
Publisher: Elsevier BV
Date: 10-2014
The importance of bearing stiffness and load when estimating the size of a defect in a rolling element bearing
Publisher: SAGE Publications
Date: 25-10-2018
Abstract: The change in the static stiffness of a bearing assembly is an important discriminator when determining the size of a defect in a rolling element bearing. In this article, the force–displacement relationships for defective bearings under various static radial loadings at various cage angular positions are analytically estimated and experimentally measured and analyzed. The study shows that the applied load has a significant effect on the static stiffness variations in defective rolling element bearings. The experimental measurements of the effect of the defect size on the varying stiffness of the bearing assembly, which has not been shown previously, provides valuable knowledge for developing methods to distinguish between defective bearings with defects that are smaller or larger than one angular ball spacing. The methods and results presented here contribute to the wider experimental investigation of the effects of loadings on the varying static stiffness of defective bearings and its effects on the measured vibration signatures. A large data set was obtained and has been made publicly available.
Molecular dynamics simulations of classical sound absorption in a monatomic gas
Publisher: Elsevier BV
Date: 05-2018
Power transmission from a vibrating body to a circular cylindrical shell through passive and active isolators
Publisher: Acoustical Society of America (ASA)
Date: 03-1997
DOI: 10.1121/1.418171
Abstract: The transmission of harmonic vibratory power from a vibrating rigid body into a thin supporting cylindrical shell through multiple passive and active isolators is investigated theoretically. The model allows for the transmission of vertical and horizontal harmonic forces and moments about all three coordinate axes. Results show that over a frequency range from 0 to 200 Hz, the real power transmission into the supporting shell can be reduced substantially by employing in parallel with existing passive isolators, active isolators adjusted to provide appropriate control force litudes and phases.
Vibro-acoustic noise control treatments for payload bays of launch vehicles: Discrete to fuzzy solutions
Publisher: Elsevier BV
Date: 11-2005
Sound propagation through elevated, heated jets in cooler cross-flow: An experimental study
Publisher: Acoustical Society of America (ASA)
Date: 07-2021
DOI: 10.1121/10.0005489
Abstract: Sound propagation through hot exhaust plumes with cooler cross-winds is present in many real world systems. One particular ex le is the sound propagation from exhaust stacks attached to open cycle gas turbine power stations. The research presented in this paper investigates the sound propagation from a reduced-scale exhaust stack, with a cross-flow from experiments conducted in a wind tunnel. Experimental measurements of the flow and temperature fields provide insight into the complex sound radiation characteristics. Results from the acoustic measurements show the change in the sound directivity arising from the inclusion of the hot exhaust plume, leading to non-axisymmetric sound directivity and a concentration of sound downwind of the exhaust stack outlet. In certain cross-flow conditions, the hot exhaust plume can increase the sound observed downwind by up to 11 dB when compared to the scenario of sound propagation from an exhaust stack in the absence of a heated jet or cross-flow. This paper describes the acoustic directivity at various radial distances from the exhaust stack, acoustic frequencies, jet temperatures, and cross-flow free-stream velocity. The results from this paper emphasise the importance of taking into consideration the hot exhaust plume with cooler cross-flow when estimating sound levels downwind of the stack.
A defect size estimation method based on operational speed and path of rolling elements in defective bearings
Publisher: Elsevier BV
Date: 12-2016
Quantification of the ultrasound induced sedimentation of Microcystis aeruginosa
Publisher: Elsevier BV
Date: 07-2014
DOI: 10.1016/J.ULTSONCH.2014.01.027
Abstract: It has been known for more than 40 years that vacuolate organisms can be induced to sediment with ultrasound. However, robust indicators are still needed to compare the efficacy of different treatments. A repeatable index is proposed that makes it possible to quantify the ultrasonic induced sedimentation. The procedure is used to monitor the long term sedimentation of Microcystis aeruginosa after sonication. Results reveal that the sedimentation process continues after gas vesicles have fully recovered, although at a slower rate.
An extensive review of vibration modelling of rolling element bearings with localised and extended defects
Publisher: Elsevier BV
Date: 11-2015
Vibration analysis of waffle floors
Publisher: Elsevier BV
Date: 2003
Erratum: “Power transmission from a vibrating body to a circular cylindrical shell through passive and active isolators” [J. Acoust. Soc. Am. 101, 1479–1491 (1997)]
Publisher: Acoustical Society of America (ASA)
Date: 11-2000
DOI: 10.1121/1.1289672
Modal mass of clamped beams and clamped plates
Publisher: Elsevier BV
Date: 03-2007
Defect size estimation in rolling element bearings with angled leading and trailing edges
Publisher: SAGE Publications
Date: 08-08-2020
Abstract: Rolling element bearings eventually become worn and develop surface defects, such as spalls, dents, and pits. Previous researchers have used bearings with defects that have sharp [Formula: see text] rectangular edges to develop methods for the estimation of the size of a defect. However, these idealized rectangular defects do not occur in the real world, they are in fact sloped. Tests on bearings with sloped edges on the entry and exit of the defect exhibited similar vibration characteristics as bearing with sharp 90° edges. A new defect size estimation method was developed to improve the accuracy in estimating the size of a defect that has sloping leading and trailing edges. A large dataset was obtained and has been made publicly available.
A tool for the optimisation of vibro-acosutic systems using a parallel genetic algorithm and a distributed computing network
Publisher: Institute of Noise Control Engineering (INCE)
Date: 2005
DOI: 10.3397/1.2839261
Exhaust stack silencer design using finite element analysis
Publisher: Institute of Noise Control Engineering (INCE)
Date: 2000
DOI: 10.3397/1.2827965
Active vibration isolation experiments using translational and rotational power transmission as a cost function
Publisher: Acoustical Society of America (ASA)
Date: 10-2006
DOI: 10.1121/1.2228839
Abstract: Active vibration isolation experiments were conducted using a transducer that measures translational and rotational power transmission from a vibrating mass, through a single-axis active isolator and into a beam. The transducer is capable of measuring forces and moments along six axes and an accelerometer array measures its motion. By combining the measured force and velocity signals the translational and rotational power transmission was measured. Comparisons were made of the effectiveness of several cost functions for minimizing the vibration transmitted into the beam. The results show that active vibration isolation using power transmission as a cost function to be minimized is limited by the phase accuracy of the transducers. The best results were obtained from the minimization of the weighted sum of force and velocity.
A nonlinear dynamic vibration model of defective bearings – The importance of modelling the finite size of rolling elements
Publisher: Elsevier BV
Date: 02-2015
Numerical study of flow and energy fields in thermoacoustic couples of non-zero thickness
Publisher: Elsevier BV
Date: 04-2009
Analysis of bearing stiffness variations, contact forces and vibrations in radially loaded double row rolling element bearings with raceway defects
Publisher: Elsevier BV
Date: 2015
Development of a Transducer for Active Vibration Isolation Using Translational and Rotational Power Transmission as a Cost Function
Publisher: SAGE Publications
Date: 21-12-2007
Abstract: When conducting active vibration control experiments it is often necessary to omit the measurements of the contribution of power transmission due to rotational moments because of the lack of suitable transducers. Here, a transducer is described which can be used to measure the translational and rotational power transmission from a source to a receiving structure. A description of the procedure used to calibrate the device is also included. The results from the calibration show that whilst the litude of the forces, moments, translational, and rotational displacements can be measured accurately, it is the phase accuracy of these measurements that limit the accuracy of measurements of power transmission.
A sliding Goertzel algorithm for adaptive passive neutralizers
Publisher: Elsevier BV
Date: 04-2012
Normal incidence acoustic absorption characteristics of a carbon nanotube forest
Publisher: Elsevier BV
Date: 12-2017
Varying stiffness and load distributions in defective ball bearings: Analytical formulation and application to defect size estimation
Publisher: Elsevier BV
Date: 02-2015
On size-dependent mechanics of nanoplates
Publisher: Elsevier BV
Date: 11-2020
Numerical comparison of thermoacoustic couples with modified stack plate edges
Publisher: Elsevier BV
Date: 09-2008
The path of rolling elements in defective bearings: Observations, analysis and methods to estimate spall size
Publisher: Elsevier BV
Date: 1
Active control of energy density in a one-dimensional waveguide: A cautionary note (L)
Publisher: Acoustical Society of America (ASA)
Date: 31-05-2005
DOI: 10.1121/1.1920213
Abstract: Acoustic energy density has been shown to be a highly effective cost function for active noise control systems. Many researchers have used the sound field in a one-dimensional waveguide to trial their control strategies before moving onto more realistic three-dimensional sound fields. This letter aims to shed some light on the observations made in the early papers on one-dimensional energy density control and also shows that some of the analysis was incorrect and the conclusions reached may be flawed.
Calculation of vibratory power transmission for use in active vibration control
Publisher: Elsevier BV
Date: 06-2000
An adaptive quarter-wave tube that uses the sliding-Goertzel algorithm for estimation of phase
Publisher: Elsevier BV
Date: 04-2014
Molecular dynamics simulations of acoustic absorption by a carbon nanotube
Publisher: AIP Publishing
Date: 06-2018
DOI: 10.1063/1.5026528
Abstract: Acoustic absorption by a carbon nanotube (CNT) was studied using molecular dynamics (MD) simulations in a molecular domain containing a monatomic gas driven by a time-varying periodic force to simulate acoustic wave propagation. Attenuation of the sound wave and the characteristics of the sound field due to interactions with the CNT were studied by evaluating the behavior of various acoustic parameters and comparing the behavior with that of the domain without the CNT present. A standing wave model was developed for the CNT-containing system to predict sound attenuation by the CNT and the results were verified against estimates of attenuation using the thermodynamic concept of exergy. This study demonstrates acoustic absorption effects of a CNT in a thermostatted MD simulation, quantifies the acoustic losses induced by the CNT, and illustrates their effects on the CNT. Overall, a platform was developed for MD simulations that can model acoustic d ing induced by nanostructured materials such as CNTs, which can be used for further understanding of nanoscale acoustic loss mechanisms associated with molecular interactions between acoustic waves and nanomaterials.
Determination of biomass concentration by measurement of ultrasonic attenuation
Publisher: Elsevier BV
Date: 07-2014
Analytical validation of an explicit finite element model of a rolling element bearing with a localised line spall
Publisher: Elsevier BV
Date: 03-2018
Related Organisations
Related Funding Activities
Discovery Projects - Grant ID: DP130102832
Start Date: 06-2013
End Date: 01-2018
Amount: $300,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP100200366
Start Date: 06-2011
End Date: 12-2014
Amount: $400,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP110100529
Start Date: 08-2011
End Date: 12-2014
Amount: $610,000.00
Funder: Australian Research Council
View Funded Activity