ORCID Profile
0000-0002-2949-5364
Current Organisation
University of Technology Sydney
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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)
Building Science and Techniques | Ship and Platform Hydrodynamics | Mechanical Engineering | Construction Materials | Numerical Modelling and Mechanical Characterisation | Civil Engineering | Environmental Rehabilitation (excl. Bioremediation) | Acoustics and Noise Control (excl. Architectural Acoustics)
ANZSRC Socio-Economic Objective (SEO)
Climate Change Adaptation Measures | Urban and Industrial Air Quality | Cement and Concrete Materials | Emerging Defence Technologies | Expanding Knowledge in Engineering |
Related Links
Publications
Non-negative intensity for planar structures under stochastic excitation
Publisher: Elsevier BV
Date: 12-2020
Analytical and numerical prediction of acoustic radiation from a panel under turbulent boundary layer excitation
Publisher: Elsevier BV
Date: 08-2020
A hybrid UWPW-FEM technique for vibroacoustic analysis of panels subject to a turbulent boundary layer excitation
Publisher: Springer International Publishing
Date: 2021
A hybrid numerical approach to predict the vibrational responses of panels excited by a turbulent boundary layer
Publisher: Elsevier BV
Date: 2020
An analytical and numerical investigation of acoustic attenuation by a finite sonic crystal
Publisher: Elsevier BV
Date: 04-2017
Trailing-Edge Noise Prediction Using a Periodic BEM Technique
Publisher: Springer Berlin Heidelberg
Date: 18-12-2016
Numerical and experimental investigation of the flow-induced noise of awall-mounted airfoil
Publisher: Springer International Publishing
Date: 26-05-2018
Vibration analysis of rectangular Mindlin plates on elastic foundations and vertically in contact with stationary fluid by the Ritz method
Publisher: Elsevier BV
Date: 02-2010
A Simplified Model of the Ground Surface Vibration Arising from a Leaking Pipe
Publisher: Springer International Publishing
Date: 07-10-2022
A steerable non-paraxial Gaussian beam expansion for a steerable parametric array loudspeaker
Publisher: Acoustical Society of America (ASA)
Date: 2023
DOI: 10.1121/10.0016816
Abstract: A steerable parametric array loudspeaker (PAL) aims to steer a highly directional audio beam without the need to mechanically rotate the source. The Gaussian beam expansion (GBE) method is often used to model PALs because it is a computationally efficient approach, however the method relies on a paraxial approximation that can result in significant inaccuracies at large steering angles. To address this limitation, a steerable non-paraxial GBE is proposed in this article, where the mainlobe of the steered ultrasonic beam is included in the calculation by rotating the coordinate system. A non-paraxial approximation is then used to improve the accuracy of the method when integrating the virtual audio sources. The numerical results obtained using the proposed method are compared against those using the conventional GBE, as well as an exact solution. For a typical configuration, it is shown that for a conventional GBE the prediction error can be more than 30 dB at large angles, whereas the proposed method reduces this to less than 1 dB. The advantage of the proposed method is more significant at large steering angles, low audio frequencies, and those locations outside of the paraxial region. This improvement in performance is achieved with a computational cost that remains the same as the conventional GBE.
Effect of Uncertainty in the Balancing Weights on the Vibration Response of a High-Speed Rotor
Publisher: ASME International
Date: 29-01-2021
DOI: 10.1115/1.4049628
Abstract: This work investigates how uncertainties in the balancing weights are propagating into the vibration response of a high-speed rotor. Balancing data are obtained from a 166-MW gas turbine rotor in a vacuum balancing tunnel. The influence coefficient method is then implemented to characterize the rotor system by a deterministic multi-speed and multi-plane matrix. To model the uncertainties, a non-s ling probabilistic method based on the generalized polynomial chaos expansion (gPCE) is employed. The uncertain parameters including the mass and angular positions of the balancing weights are then expressed by gPCE with deterministic coefficients. Assuming predefined probability distributions of the uncertain parameters, the stochastic Galerkin projection is applied to calculate the coefficients for the input parameters. Furthermore, the vibration litudes of the rotor response are represented by appropriate gPCE with unknown deterministic coefficients. These unknown coefficients are determined using the stochastic collocation method by evaluating the gPCE for the system response at a set of collocation points. The effects of in idual and combined uncertain parameters from a single and multiple balancing planes on the rotor vibration response are examined. Results are compared with the Monte Carlo simulations, showing excellent agreement.
Active acoustic cloaking in a convected flow field.
Publisher: Acoustical Society of America (ASA)
Date: 07-2019
DOI: 10.1121/1.5119225
Abstract: Acoustic cloaking has mostly been considered within a stationary fluid. The authors herein show that accounting for the effects of convection in the presence of fluid flow is critical for cloaking in the acoustic domain. This work presents active acoustic cloaking in a convected flow field for two different incident fields, corresponding to a plane wave and a single monopole source, impinging on a rigid body. Monopole control sources circumferentially arranged around the rigid body are used to generate a secondary acoustic field to destructively interfere with the primary scattered field arising from the incident excitation cases. The authors show that for sound waves in a moving fluid, active cloaking can only be achieved using a convected cloak, which is dependent on Mach number.
Acoustic source localisation using vibroacoustic beamforming
Publisher: Elsevier BV
Date: 09-2023
A spherical wave expansion for a steerable parametric array loudspeaker using Zernike polynomials
Publisher: Acoustical Society of America (ASA)
Date: 10-2022
DOI: 10.1121/10.0014832
Abstract: A steerable parametric array loudspeaker (PAL) can electronically steer highly directional audio beams in the desired direction. The challenge of modelling a steerable PAL is to obtain the audio sound pressure in both near and far fields with a low computational load. To address this issue, an extension of the spherical wave expansion is proposed in this paper. The steerable velocity profile on the radiation surface is expanded as Zernike polynomials which are an orthogonal and form a complete set over a unit circle. An expression for the radiated audio sound is then obtained using a superposition of Zernike modes. Compared to the existing methods, the proposed expansion is computationally efficient and provides a rigorous transformation of the quasilinear solution of the Westervelt equation without paraxial approximations. The proposed expansion is further extended to accommodate local effects by using an algebraic correction to the Westervelt equation. Numerical results for steering single and dual beams are presented and discussed. It is shown that the single beam can be steered in the desired direction in both near and far fields. However, dual beams cannot be well separated in the near field, which cannot be predicted by the existing far field models.
Numerical prediction of turbulent boundary layer noise from a sharp‐edged flat plate
Publisher: Wiley
Date: 24-04-2019
DOI: 10.1002/FLD.4733
Analysis of phase data from ground vibration measurements above a leaking plastic water pipe
Publisher: Elsevier BV
Date: 11-2023
Recent Advancements in IoT Implementation for Environmental, Safety, and Production Monitoring in Underground Mines
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-08-2023
Fluid-structure interaction analysis of hydrofoils in a pulsating flow
Publisher: EDP Sciences
Date: 2016
An analytical approach for modelling the vibroacoustic behaviour of a heavy fluid-loaded plate near a free surface
Publisher: Elsevier BV
Date: 11-2022
Forced vibroacoustic response of a cylindrical shell in an underwater acoustic waveguide
Publisher: Elsevier BV
Date: 04-2023
Natural frequencies of rectangular Mindlin plates coupled with stationary fluid
Publisher: Elsevier BV
Date: 02-2012
Closed-form vibration analysis of thick annular functionally graded plates with integrated piezoelectric layers
Publisher: Elsevier BV
Date: 03-2010
Simulation of airfoil surface pressure due to incident turbulence using realizations of uncorrelated wall plane waves
Publisher: Acoustical Society of America (ASA)
Date: 02-2021
DOI: 10.1121/10.0003498
Abstract: A numerical technique is proposed for synthesizing realizations of airfoil surface pressure induced by incoming turbulence. In this approach, realization of the surface pressure field is expressed as a set of uncorrelated wall plane waves. The litude of these plane waves is determined from the power spectrum density function of the incoming upwash velocity fluctuation and the airfoil aeroacoustic transfer function. The auto-spectrum of the surface pressure is obtained from an ensemble average of different realizations. The numerical technique is computationally efficient as it rapidly converges using a relatively small number of realizations. The surface pressures for different airfoils excited by incoming turbulence are numerically predicted, and the results are compared with experimental data in the literature. Further, the unsteady force exerted on an airfoil due to the airfoil-turbulence interaction is also computed, and it is shown to be in very good agreement with analytical results.
On the Pipe Localization Based on the Unwrapped Phase of Ground Surface Vibration Between a Roving Pair of Sensors
Publisher: Springer International Publishing
Date: 07-10-2022
Noise from a blunt edged flat plate in a reverberant water tunnel
Publisher: RWTH Aachen University
Date: 2019
Waves Propagating in Water-Filled Plastic Pipes Due to Leak Noise Excitation: A Numerical and Experimental Investigation
Publisher: Springer International Publishing
Date: 07-10-2023
On the role of vibro-acoustics in leak detection for plastic water distribution pipes
Publisher: Elsevier BV
Date: 2017
Efficient solution of block Toeplitz systems with multiple right-hand sides arising from a periodic boundary element formulation
Publisher: Elsevier BV
Date: 09-2021
Noise radiated from fluid loaded stiffened cylindrical shells subject to a turbulent boundary layer
Publisher: Springer International Publishing
Date: 2021
Flow generated noise produced by a blunt edged plate in a water tunnel
Publisher: Springer International Publishing
Date: 2021
Boundary element solution for periodic acoustic problems
Publisher: Elsevier BV
Date: 2016
Sound power radiated from acoustically thick, fluid loaded, axisymmetric pipes excited by a central monopole
Publisher: Elsevier BV
Date: 06-2022
Sidelobe Suppression for a Steerable Parametric Source Using the Sparse Random Array Technique
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2023
Closed-form solution for free vibration of piezoelectric coupled annular plates using Levinson plate theory
Publisher: Elsevier BV
Date: 04-2010
The effect of axial boundary conditions on breakout noise from finite cylindrical ducts
Publisher: Elsevier BV
Date: 03-2023
On the effects of soil properties on leak noise propagation in plastic water distribution pipes
Publisher: Elsevier BV
Date: 08-2018
Acoustic Scattering for Rotational and Translational Symmetric Structures in Nonuniform Potential Flow
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 10-2017
DOI: 10.2514/1.J055844
Hydroelastic vibration and buckling of rectangular Mindlin plates on Pasternak foundations under linearly varying in-plane loads
Publisher: Elsevier BV
Date: 12-2010
Numerical analysis of vibroacoustic beamforming gains for acoustic source detection inside a pipe conveying turbulent flow
Publisher: Elsevier BV
Date: 05-2022
Noise radiated from a periodically stiffened cylindrical shell excited by a turbulent boundary layer
Publisher: Elsevier BV
Date: 02-2020
Non-negative intensity for a heavy fluid-loaded stiffened plate
Publisher: Elsevier BV
Date: 12-2023
Scattering by a rigid sphere of audio sound generated by a parametric array loudspeaker
Publisher: Acoustical Society of America (ASA)
Date: 03-2022
DOI: 10.1121/10.0009750
Abstract: This work investigates the scattering by a rigid sphere of audio sound generated by a parametric array loudspeaker (pal). A computationally efficient method utilizing a spherical harmonic expansion is developed to calculate the quasilinear solution of audio sound fields based on both Kuznetsov and Westervelt equations. The accuracy of using the Westervelt equation is examined, and the rigid sphere scattering effects are simulated with the proposed method. It is found the results obtained using the Westervelt equation are inaccurate near the sphere at low frequencies. Contrary to conventional loudspeakers, the directivity of the audio sound generated by a pal severely deteriorates behind a sphere, as the ultrasounds maintaining the directivity of the audio sound are almost completely blocked by the sphere. Instead, the ultrasounds are reflected and generate audio sound on the front side of the sphere. It means that a listener in front of the pal will hear the audio sound scattered back after introducing the sphere as if it is reflected by the sphere. The experiment results are also presented to validate the numerical results.
Aeroacoustic analysis of a cylinder in low Mach number flow using a periodic CFD-BEM technique
Publisher: American Institute of Aeronautics and Astronautics
Date: 27-05-2016
DOI: 10.2514/6.2016-2842
On the effects of coupling between in-plane and out-of-plane vibrating modes of smart functionally graded circular/annular plates
Publisher: Elsevier BV
Date: 03-2012
Vibrational response of a fluid-loaded baffled plate near the free surface of a fluid
Publisher: Institute of Noise Control Engineering (INCE)
Date: 08-2021
DOI: 10.3397/IN-2021-2721
Abstract: An analytical model to predict the vibrational response of a simply supported rectangular plate embedded in an infinite baffle with an upper free surface under heavy fluid loading and excited by a point force is presented. The equations of motion of a thin plate are solved using modal decomposition technique by employing admissible functions for an in-vacuo plate and by directly solving the Helmholtz equation for acoustic waves in a fluid. The vibrational response for a flat plate in an infinite baffle and unbounded domain (semi-infinite domain) using analytical formulation available in literature is initially computed. These results are then compared against present results to observe the effect of a free surface. Predictions from analytical models are validated by comparison with results obtained by numerical models. The proposed analytical approach presents a novel formulation to describe a fluid-loaded flat plate in a waveguide and an efficient method for predicting its vibrational response.
Effect of a serrated trailing edge on sound radiation from nearby quadrupoles
Publisher: Acoustical Society of America (ASA)
Date: 05-2017
DOI: 10.1121/1.4982201
Abstract: A periodic boundary element technique is implemented to study the noise reduction capability of a plate with a serrated trailing edge under quadrupole excitation. It is assumed for this purpose that the quadrupole source tensor is independent of the trailing edge configuration and that the effect of the trailing edge shape is to modify sound radiation from prescribed boundary layer sources. The flat plate is modelled as a continuous structure with a finite repetition of small spanwise segments. The matrix equation formulated by the periodic boundary element method for this 3D acoustic scattering problem is represented as a block Toeplitz matrix. The discrete Fourier transform is employed in an iterative algorithm to solve the block Toeplitz system. The noise reduction mechanism for a serrated trailing edge in the near field is investigated by comparing contour plots obtained from each component of the quadrupole for unserrated and serrated trailing edge plate models. The noise reduction due to the serrated trailing edge is also examined as a function of the source location.
Low Frequency Audio Sound Field Generated by a Focusing Parametric Array Loudspeaker
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Radiated Sound Power from Near-Surface Acoustic Sources
Publisher: The Society of Naval Architects and Marine Engineers
Date: 14-04-2022
Abstract: This article investigates the radiated sound power from idealized propeller noise sources, characterized by elemental monopole and dipole acoustic sources near the sea surface. The free surface of the sea is modeled as a pressure-release surface. The ratio of sound power of the near surface sources to the sound power from the same sources in an unbounded fluid is presented as a function of source immersion relative to sound wavelength. We herein show that the sound power radiated by submerged monopole and horizontal dipole sources is greatly reduced by the effect of the free surface at typical blade passing frequencies. By contrast, the sound power from a submerged vertical dipole is doubled. A transition frequency for the submerged monopole and horizontal dipole is identified. Above this transition frequency, the radiated power is not significantly influenced by the sea surface. Directivity patterns for the acoustic sources are also presented. The principal sources contributing to underwater radiated noise (URN) over a wide frequency range are propellers and onboard machinery (Urick 1983 Ross 1987 Collier 1997 Carlton 2007). Propeller sources are highly complex, but simplification is possible at low frequencies where the wavelength of underwater sound is much larger than propeller dimensions. The propeller may then be regarded as a set of fluctuating forces at the propeller hub and a stationary monopole source that represents the growth and collapse of a cavitation region as each blade passes through the region of wake deficit. This type of model was used by Kinns and Bloor (2004) to examine the net fluctuating forces on a cruise ship hull due to defined propeller sources. The nature of the monopole source was considered by Gray and Greeley (1980), who focused on singlescrew merchant ships where cavitation is dominant at operational speeds. Nonuniformity in the wake, as well as static pressure that falls toward the sea surface, causes this monopole source to be located near top dead center, closer to the surface than the propeller hub. It introduces cyclic components at multiples of propeller blade passing frequency (bpf) as well as broadband noise over a wide frequency range. These components create a pressure field that acts on nearby hull surfaces, but the URN is controlled by the presence of the pressure release surface that corresponds to the free surface of the sea. The aim of this article was to investigate how idealized propeller noise sources are influenced by the surface of the sea.
Quiet zone generation in an acoustic free field using multiple parametric array loudspeakers
Publisher: Acoustical Society of America (ASA)
Date: 02-2022
DOI: 10.1121/10.0009587
Abstract: This paper investigates the feasibility of remotely generating a quiet zone in an acoustic free field using multiple parametric array loudspeakers (PALs). A primary sound field is simulated using point monopoles located randomly in a two-dimensional plane, or three-dimensional (3D) space, whereas the secondary sound field is generated by multiple PALs uniformly distributed around the circumference of a circle sitting on the same plane as the primary sources, or on the surface of a sphere for 3D space. A quiet zone size is defined as the diameter of the maximal circular zone within which the noise reduction is greater than 10 dB. The size of this quiet zone is found to be proportional to 0.19λN for N secondary sources with a wavelength λ when the primary and secondary sources are in the same plane, whereas it is found to be 0.55λN1/2 for the 3D case. The size of the quiet zones generated by PALs is similar to that observed with traditional omnidirectional loudspeakers however, the effects of using PALs on the sound field outside the target zone is much smaller due to their sharp radiation directivity and slow decay rate along the propagation distance. Experimental results are also presented to validate these numerical simulations.
Vibroacoustic responses of a heavy fluid loaded cylindrical shell excited by a turbulent boundary layer
Publisher: Elsevier BV
Date: 2020
A cylindrical expansion of the audio sound for a steerable parametric array loudspeaker
Publisher: Acoustical Society of America (ASA)
Date: 11-2021
DOI: 10.1121/10.0007280
Abstract: In this work, a cylindrical expansion for the audio sound generated by a steerable baffled parametric array loudspeaker (PAL) based on the phased array technique is derived from the Westervelt equation. The expansion is a series of twofold summations with uncoupled angular and radial components in the cylindrical coordinate system. The angular component is determined by the trigonometric functions, and the radial component is an integral containing the Bessel functions and an arbitrary excitation velocity profile. The numerical results for a typical steerable PAL are presented and compared to those obtained using the convolution model. It is found that the prediction of the audio sound using the proposed cylindrical expansion improves the agreement with the experimental results when compared to the existing models. This is because no further approximations are required in the cylindrical expansion of the quasilinear solution of the Westervelt equation, whereas the complex near field nonlinear interactions between the ultrasonic waves cannot be correctly captured in a convolution model. The proposed cylindrical expansion does, therefore, provide an alternative approach to modeling a phased array PAL and high accuracy with a relatively low computational cost.
Spatial coherence of pipe vibrations induced by an internal turbulent flow
Publisher: Elsevier BV
Date: 02-2021
Acoustic scattering for 3D multi-directional periodic structures using the boundary element method
Publisher: Acoustical Society of America (ASA)
Date: 2017
DOI: 10.1121/1.4973908
Abstract: An efficient boundary element formulation is proposed to solve three-dimensional exterior acoustic scattering problems with multi-directional periodicity. The multi-directional periodic acoustic problem is represented as a multilevel block Toeplitz matrix. By exploiting the Toeplitz structure, the computational time and storage requirements to construct and to solve the linear system of equations arising from the boundary element formulation are significantly reduced. The generalized minimal residual method is implemented to solve the linear system of equations. To efficiently calculate the matrix-vector product in the iterative algorithm, the original matrix is embedded into a multilevel block circulant matrix. A multi-dimensional discrete Fourier transform is then employed to accelerate the matrix-vector product. The proposed approach is applicable to a periodic acoustic problem for any arbitrary shape of the structure in both full space and half space. Two case studies involving sonic crystal barriers are presented. In the first case study, a sonic crystal barrier comprising rigid cylindrical scatterers is modeled. To demonstrate the effectiveness of the proposed technique, periodicity in one, two, or three directions is examined. In the second case study, the acoustic performance of a sonic crystal barrier with locally resonant C-shaped scatterers is studied.
Active acoustic cloaking of cylindrical shells in low Mach number flow
Publisher: Elsevier BV
Date: 08-2020
Related Organisations
Related Funding Activities
Discovery Early Career Researcher Award - Grant ID: DE190101412
Start Date: 06-2019
End Date: 06-2022
Amount: $338,858.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP200200779
Start Date: 10-2021
End Date: 10-2024
Amount: $230,636.00
Funder: Australian Research Council
View Funded Activity