ORCID Profile
0000-0002-1444-4716
Current Organisation
University of Adelaide
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
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)
Mechanical Engineering | Acoustics and Noise Control (excl. Architectural Acoustics) | Mechanical Engineering | Control Engineering | Acoustics and Acoustical Devices; Waves | Turbulent Flows | Dynamics, Vibration and Vibration Control | Wastewater Treatment Processes | Fluidization And Fluid Mechanics | Industrial Engineering | Maritime Engineering | Electrical Engineering | Engineering And Technology Not Elsewhere Classified | Biomechanical Engineering | Aerospace Engineering | Theoretical and Computational Chemistry | Quantum Chemistry | Electrical and Electronic Engineering | Chemical Engineering | Maritime Engineering not elsewhere classified | Aerospace Engineering Not Elsewhere Classified | Signal Processing | Genome Structure | Interdisciplinary Engineering Not Elsewhere Classified | Solid Mechanics | Numerical Modelling and Mechanical Characterisation | Aerospace Structures | Water Treatment Processes | Marine Engineering | Cell Development, Proliferation and Death |
ANZSRC Socio-Economic Objective (SEO)
Industrial machinery and equipment | Aerospace equipment | Navy | Wind Energy | Air transport | Wind | Chemical sciences | Physical sciences | Air transport | Environmentally Sustainable Mineral Resource Activities not elsewhere classified | Field crops not elsewhere classified | Mining and Extraction of Precious (Noble) Metal Ores | Rail Safety | Manufactured products not elsewhere classified | Rail Freight | Instrumentation not elsewhere classified | Water Services and Utilities | Computer software and services not elsewhere classified | Water services and utilities | Scientific Instruments | Expanding Knowledge in Engineering | Public health not elsewhere classified | Machinery and equipment not elsewhere classified
Related Links
Publications
Sound attenuation in rectangular and circular cross-section ducts with flow and bulk-reacting liner
Publisher: Elsevier BV
Date: 04-1991
Flow resistance information for acoustical design
Publisher: Elsevier BV
Date: 09-1980
Forced phase-locked response of a nonlinear system with time delay after Hopf bifurcation
Publisher: Elsevier BV
Date: 07-2005
High frequency spatial vibration control for complex structures
Publisher: Elsevier BV
Date: 11-2008
Near field measurement of the complex radiation impedance presented to a vibrating plate in a reverberant room containing a rotating diffuser
Publisher: Elsevier BV
Date: 11-1980
Errors in the measurement of acoustic energy density in one-dimensional sound fields
Publisher: Elsevier BV
Date: 10-2000
The response of a Duffing–van der Pol oscillator under delayed feedback control
Publisher: Elsevier BV
Date: 04-2006
Nonlinear Dynamics of Magnetic Bearing Systems
Publisher: SAGE Publications
Date: 20-05-2008
Abstract: Magnetic bearings use magnetic forces to support various machine components. Because of the non-contact nature of this type of suspension, magnetic bearing technology offers a number of significant advantages over conventional bearings, such as rolling element and fluid film bearings. An active magnetic bearing basically consists of an electromagnetic actuator, position sensors, power lifiers, and a feedback controller. All of these components are characterized by nonlinear behavior and therefore the entire system is inherently nonlinear. However, in simulations of the dynamic behavior of magnetic bearing systems, the nonlinearities are usually neglected to simplify the analysis and only linear models are used. Moreover, many control techniques currently used in magnetic bearing systems are generally designed by ignoring nonlinear effects. The main reason for simplification is the intractability of the complexity of the actual model. In fact, the inherent nonlinear properties of magnetic bearing systems can lead to dynamic behavior of a magnetically suspended rotor that is distinctly different from that predicted using a simple linearized model. Therefore, the nonlinearities should be taken into account. This literature review is focused on the nonlinear dynamics of magnetic bearing systems and it provides background information on analytical methods, nonlinear vibrations resulting from a rotor contacting auxiliary bearings, and other active topics of research involving the nonlinear properties of magnetic bearing systems, such as nonlinear self-sensing magnetic bearings and nonlinear control of magnetic bearings. The review concludes with a brief discussion on current and possible future directions for research on the nonlinear dynamics of magnetic bearing systems.
Recent Advances in Wind Turbine Noise Research
Publisher: MDPI AG
Date: 20-03-2020
Abstract: This review is focussed on large-scale, horizontal-axis upwind turbines. Vertical-axis turbines are not considered here as they are not sufficiently efficient to be deployed in the commercial generation of electricity. Recent developments in horizontal-axis wind turbine noise research are summarised and topics that are pertinent to the problem, but are yet to be investigated, are explored and suggestions for future research are offered. The major portion of recent and current research on wind turbine noise generation, propagation and its effects on people and animals is being undertaken by groups in Europe, UK, USA, Japan, Australia and New Zealand. Considerable progress has been made in understanding wind turbine noise generation and propagation as well as the effect of wind farm noise on people, birds and animals. However, much remains to be done to answer many of the questions for which answers are still uncertain. In addition to community concerns about the effect of wind farm noise on people and how best to regulate wind farm noise and check installed wind farms for compliance, there is considerable interest from turbine manufacturers in developing quieter rotors, with the intention of allowing wind farm installations to be closer to populated areas. The purpose of this paper is to summarise recent and current wind farm noise research work and the research questions that remain to be addressed or are in the process of being addressed. Topics that are the subject of on-going research are discussed briefly and references to recent and current work are included.
Detection of broken rotor bars in induction motor using starting-current analysis and effects of loading
Publisher: Institution of Engineering and Technology (IET)
Date: 2006
Use of a perforated panel for the active control of sound radiated from vibrating structures, I: Low-frequency analysis
Publisher: Elsevier BV
Date: 07-1992
Active control of sound radiation from a vibrating rectangular panel by sound sources and vibration inputs: An experimental comparison
Publisher: Elsevier BV
Date: 03-1991
Hopf Bifurcation of a Magnetic Bearing System with Time Delay
Publisher: ASME International
Date: 16-12-2004
DOI: 10.1115/1.1924644
Abstract: This paper is concerned with a study of the influence of a time delay occurring in a PD feedback control on the dynamic stability of a rotor suspended by magnetic bearings. In the presence of geometric coordinate coupling and time delay, the equations of motion governing the response of the rotor are a set of two-degree-of-freedom nonlinear differential equations with time delay coupling in nonlinear terms. It is found that as the time delay increases beyond a critical value, the equilibrium position of the rotor motion becomes unstable and may bifurcate into two qualitatively different kinds of periodic motion. The resultant Hopf bifurcation is associated with two coincident pairs of complex conjugate eigenvalues crossing the imaginary axis. Based on the reduction of the infinite dimensional problem to the flow on a four-dimensional center manifold, the bifurcating periodic solutions are investigated using a perturbation method.
Vibration analysis of waffle floors
Publisher: Elsevier BV
Date: 2003
The effect of transfer function estimation errors on the filtered-x LMS algorithm
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-1994
DOI: 10.1109/78.285659
Application of least mean square algorithm to suppression of maglev track-induced self-excited vibration
Publisher: Elsevier BV
Date: 11-2011
A Kalman filter approach to virtual sensing for active noise control
Publisher: Elsevier BV
Date: 02-2008
Engineering Noise Control, Fifth Edition
Publisher: CRC Press
Date: 12-2017
Errors arising from three-dimensional energy density sensing in one-dimensional sound fields
Publisher: Elsevier BV
Date: 09-2000
CALCULATING RESONANCE FREQUENCIES OF PERFORATED PANELS
Publisher: Elsevier BV
Date: 10-1996
High frequency spatial vibration control using method
Publisher: Elsevier BV
Date: 05-2007
The Design of Systems to Control Actively Periodic Sound Transmission Into Enclosed Spaces, Part I: Analytical Models
Publisher: Elsevier BV
Date: 03-1994
Presynaptic targeting of botulinum neurotoxin type A requires a tripartite PSG‐Syt1 ‐SV2 plasma membrane nanocluster for synaptic vesicle entry
Publisher: EMBO
Date: 25-05-2023
Abstract: The unique nerve terminal targeting of botulinum neurotoxin type A (BoNT/A) is due to its capacity to bind two receptors on the neuronal plasma membrane: polysialoganglioside (PSG) and synaptic vesicle glycoprotein 2 (SV2). Whether and how PSGs and SV2 may coordinate other proteins for BoNT/A recruitment and internalization remains unknown. Here, we demonstrate that the targeted endocytosis of BoNT/A into synaptic vesicles (SVs) requires a tripartite surface nanocluster. Live‐cell super‐resolution imaging and electron microscopy of catalytically inactivated BoNT/A wildtype and receptor‐binding‐deficient mutants in cultured hippoc al neurons demonstrated that BoNT/A must bind coincidentally to a PSG and SV2 to target synaptic vesicles. We reveal that BoNT/A simultaneously interacts with a preassembled PSG‐synaptotagmin‐1 (Syt1) complex and SV2 on the neuronal plasma membrane, facilitating Syt1‐SV2 nanoclustering that controls endocytic sorting of the toxin into synaptic vesicles. Syt1 CRISPRi knockdown suppressed BoNT/A‐ and BoNT/E‐induced neurointoxication as quantified by SNAP‐25 cleavage, suggesting that this tripartite nanocluster may be a unifying entry point for selected botulinum neurotoxins that hijack this for synaptic vesicle targeting.
Analytical approximation of the primary resonance response of a periodically excited piecewise non-linear–linear oscillator
Publisher: Elsevier BV
Date: 11-2004
Stability and dynamics of a controlled van der Pol–Duffing oscillator
Publisher: Elsevier BV
Date: 04-2006
The Design of Systems to Control Actively Periodic Sound Transmission Into Enclosed Spaces, Part II: Mechanisms and Trends
Publisher: Elsevier BV
Date: 03-1994
Detection of Broken Rotor Bar Faults and Effects of Loading in Induction Motors during Rundown
Publisher: IEEE
Date: 05-2007
Response of a cylindrical machine casing to oscillatory bearing forces
Publisher: Elsevier BV
Date: 1982
Feedback control of structurally radiated sound into enclosed spaces using structural sensing
Publisher: Acoustical Society of America (ASA)
Date: 11-1999
DOI: 10.1121/1.428132
Abstract: A technique is developed that addresses sensor and actuator placement and feedback control of structural/acoustic problems that can be described as a flexible structure surrounding an acoustic cavity. Specifically, this work is directed at the space launch vehicle problem, where it is assumed that it is not possible to obtain, in advance of a required control output, a coherent measurement of the disturbance or to directly measure the quantity to be controlled. These assumptions necessitate the use of structural sensing to predict the sound pressure in the cavity and of feedback control to reduce the radiated sound. A method for selecting sensor and actuator positions based on a transformation of the problem into radiation modes is covered as well as an optimal feedback control approach which allows the control of radiated pressure into a defined subvolume of the cavity using only structural actuators and sensors. Finally, an ex le problem is completed which draws on all of the theoretical development to suppress radiated sound within a subvolume.
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.
Nonlinear control of a parametrically excited system subject to actuator saturation
Publisher: IEEE
Date: 2003
Effectiveness of a passive-active vibration isolation system with actuator constraints
Publisher: Chinese Journal of Mechanical Engineering
Date: 05-2014
NON-LINEAR RESPONSE OF A POST-BUCKLED BEAM SUBJECTED TO A HARMONIC AXIAL EXCITATION
Publisher: Elsevier BV
Date: 10-2000
Optimal truncated model for vibration control design within a specified bandwidth
Publisher: Elsevier BV
Date: 07-2007
Dynamics of two delay coupled van der Pol oscillators
Publisher: Elsevier BV
Date: 09-2006
An extensive review of vibration modelling of rolling element bearings with localised and extended defects
Publisher: Elsevier BV
Date: 11-2015
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
Severe Slugging in Flexible Risers: Review of Experimental Investigations and OLGA Predictions
Publisher: Informa UK Limited
Date: 27-07-2007
Mechanisms of active noise control by vibration sources
Publisher: Elsevier BV
Date: 06-1991
Suppression of maglev vehicle–girder self-excited vibration using a virtual tuned mass damper
Publisher: Elsevier BV
Date: 02-2011
Wave propagation through cylinder/plate junctions
Publisher: Elsevier BV
Date: 09-1995
AN ALGORITHM FOR ACTIVE CONTROL OF TRANSFORMER NOISE WITH ON-LINE CANCELLATION PATH MODELLING BASED ON THE PERTURBATION METHOD
Publisher: Elsevier BV
Date: 03-2001
Vibration Transducer Principles and Types of Vibration Transducers
Publisher: Wiley
Date: 19-09-2007
NON-LINEAR OSCILLATIONS OF A ROTOR IN ACTIVE MAGNETIC BEARINGS
Publisher: Elsevier BV
Date: 03-2001
LOCAL BIFURCATION CONTROL IN A ROTOR-MAGNETIC BEARING SYSTEM
Publisher: World Scientific Pub Co Pte Ltd
Date: 04-2003
DOI: 10.1142/S0218127403007060
Abstract: Linear-plus-nonlinear feedback control is used to stabilize Hopf bifurcation in a rotor-magnetic bearing system, for which the linearized system possesses a double zero eigenvalues. The addition of nonlinear (quadratic) terms to the original linear feedback control formulation is used to modify the coefficients of the nonlinear terms in the reduced normal forms. It is found that feedback control incorporating certain quadratic terms renders the Hopf bifurcation supercritical. Finally, illustrative ex les are given to verify the analytical results.
Sound Absorption in Rooms
Publisher: Wiley
Date: 19-09-2007
Active noise control in a free field with virtual sensors
Publisher: Acoustical Society of America (ASA)
Date: 2001
DOI: 10.1121/1.1326950
Abstract: The zone of local control around a “virtual energy density sensor” is compared with that offered by an actual energy density sensor, a single microphone, and a virtual microphone. Intended as an introduction to the concept of forward difference prediction and a precursor to evaluating the virtual sensor control algorithms in d ed enclosures, this paper investigates an idealized scenario of a single primary sound source in a free-field environment. An analytical model is used to predict the performance of the virtual error sensors and compare their control performance with their physical counterparts. The model is then experimentally validated. The model shows that in general the virtual energy density sensor outperforms the actual energy density sensor, the actual microphone, and the virtual microphone in terms of centering a practically sized zone of local control around an observer who is remotely located from any physical sensors. However, in practice, the virtual sensor algorithms are shown to be sensitive (by varying degrees) to short wavelength spatial pressure variations of the primary and secondary sound fields.
Suppression of the stationary maglev vehicle–bridge coupled resonance using a tuned mass damper
Publisher: SAGE Publications
Date: 11-01-2012
Abstract: The coupled resonance that occurs between a maglev vehicle and an elevated bridge is a unique problem for an electromagnetic suspension maglev system when the vehicle is suspended above the bridge without moving. This problem causes the bridge to vibrate in a large litude, it significantly degrades the ride comfort of the maglev train, and it needs to be solved before the commercial application of the system. In this paper, the principle of the stationary vehicle–bridge coupled resonance is investigated, and it is shown that the levitation system is non-passive and it causes self-excited vibration when the first resonance frequency of the bridge approaches the critical frequency of the levitation system. To eliminate the coupled resonance, an approach using a tuned mass d er (TMD) to render passive the levitation control system is presented, and it shows that a TMD with appropriate parameters can stabilize the coupled system. A procedure for seeking out a group of suboptimal parameters of the TMD is also proposed. This procedure ensures that the designed result has a satisfactory performance as well as a reasonable stability margin. The location where the TMD should be mounted to achieve the best performance is discussed. The numerical simulation shows that the designed TMD can completely suppress the vehicle–bridge coupled resonance.
Active control of vibration
Publisher: Elsevier BV
Date: 12-1996
Control of flexural vibration in stiffened structures using multiple piezoceramic actuators
Publisher: Elsevier BV
Date: 09-1996
Phospholipases in neuronal function: A role in learning and memory?
Publisher: Wiley
Date: 07-02-2020
DOI: 10.1111/JNC.14918
Abstract: Despite the human brain being made of nearly 60% fat, the vast majority of studies on the mechanisms of neuronal communication which underpin cognition, memory and learning, primarily focus on proteins and/or (epi)genetic mechanisms. Phospholipids are the main component of all cellular membranes and function as substrates for numerous phospholipid-modifying enzymes, including phospholipases, which release free fatty acids (FFAs) and other lipid metabolites that can alter the intrinsic properties of the membranes, recruit and activate critical proteins, and act as lipid signalling molecules. Here, we will review brain specific phospholipases, their roles in membrane remodelling, neuronal function, learning and memory, as well as their disease implications. In particular, we will highlight key roles of unsaturated FFAs, particularly arachidonic acid, in neurotransmitter release, neuroinflammation and memory. In light of recent findings, we will also discuss the emerging role of phospholipase A
Active control of vibratory power transmission along a semi-infinite plate
Publisher: Elsevier BV
Date: 07-1995
Acoustic cluster control of noise radiated from a planar structure
Publisher: Acoustical Society of America (ASA)
Date: 31-05-2005
DOI: 10.1121/1.1920187
Abstract: Acoustic cluster control is proposed for the purpose of achieving global sound attenuation of a planar structure. First, acoustic cluster filtering using a point sensor array is presented, which enables the grouping of sound radiated from a target object into a set of clusters, such that each cluster possesses the same common characteristics. This allows the possibility of extracting the cluster of interest without causing observation spillover. Based on the principle of reciprocity, cluster actuation using a point source array is then presented. Driving the source array in accordance with a proposed control law, the excitation of the designated cluster is performed without causing control spillover. Moreover, by combining both acoustic cluster filtering and acoustic cluster actuation, acoustic cluster control may be performed. In implementing acoustic cluster control, the necessary and sufficient condition for the acoustic cluster control is illustrated. It is also shown that the sound radiated from a planar structure may be captured in appropriate acoustic cluster filtering so that acoustic cluster control may be implemented. Experiment was conducted demonstrating the capability as well as the validity of the acoustic cluster filtering, actuation, and control for suppressing the noise radiated from a rectangular panel.
Identification of low frequency wind turbine noise using secondary windscreens of various geometries
Publisher: Institute of Noise Control Engineering (INCE)
Date: 03-2014
DOI: 10.3397/1/376207
Near-field sensing strategies for the active control of the sound radiated from a plate
Publisher: Acoustical Society of America (ASA)
Date: 12-1999
DOI: 10.1121/1.428193
Abstract: When designing an active control system to globally control the far-field sound radiation from a vibrating surface, a challenging problem is to properly define the near-field acoustic sensing strategy and the type of cost function to be minimized by the controller. The strategy of sensing and minimizing the near-field active intensity at discrete locations in the active control of free field radiation from a vibrating plate is investigated in this paper. The optimal minimization of the sum of the near-field, normal active sound intensities at the error sensor locations using acoustic control sources is derived for this problem, and the results obtained are compared to the minimization of the sum of the near-field squared pressures. Some of the difficulties associated with sound intensity minimization are pointed out.
On the approximate solution of a piecewise nonlinear oscillator under super-harmonic resonance
Publisher: Elsevier BV
Date: 05-2005
A waveform synthesis algorithm for active control of transformer noise: implementation
Publisher: Elsevier BV
Date: 05-2002
Near field determination of the complex radiation efficiency and acoustic intensity distribution for a resonality vibrating surface
Publisher: Elsevier BV
Date: 1979
SECONDARY ACOUSTIC SOURCE TYPES FOR ACTIVE NOISE CONTROL IN FREE FIELD: MONOPOLES OR MULTIPOLES?
Publisher: Elsevier BV
Date: 05-2000
Virtual error sensing for active noise control in a one-dimensional waveguide: Performance prediction versus measurement (L)
Publisher: Acoustical Society of America (ASA)
Date: 2003
DOI: 10.1121/1.1523386
Abstract: Virtual error sensing is a novel active noise control technique, which is designed to produce a zone of attenuation remote from the physical error sensors. In this letter virtual sensing is investigated for tonal noise (both on and off resonance) in a long narrow duct. The performance of the virtual error sensors using real-time control is compared to the performance determined from an analytical model and the performance determined through the postprocessing of experimental data. Two ex les of control using postprocessed experimental transfer function data are presented the first relied on transfer functions measured using broadband noise and the second relied on transfer functions measured at discrete frequencies. The results highlight the significant errors encountered as a result of using broadband transfer functions in lightly d ed enclosures.
Implementation of active noise control in a multi-modal spray dryer exhaust stack
Publisher: Elsevier BV
Date: 2006
An alternative mathematical description of the relationship between noise exposure and hearing loss
Publisher: Acoustical Society of America (ASA)
Date: 12-1990
DOI: 10.1121/1.399677
Abstract: Retrospective investigation of large populations has provided means for determining quantitative relationships between the hearing levels of non-noise-exposed populations and age, and between the hearing levels of noise-exposed populations and age and noise exposure. In the latter case, noise exposures have been predominantly steady state over many years and no way of measuring the effects of noise alone, excluding the effects of age, has ever been demonstrated. In the following paper, attention is confined to the problem of developing a mathematical description of an existing set of empirically determined hearing level data questions of audiology are not of concern here. It is shown that the mathematical analysis traditionally used to determine the contribution of noise exposure alone to hearing level is not unique an alternative formulation is possible and indeed is demonstrated. Whereas the traditional formulation leads to the conclusion that noise-induced hearing loss scales on the integral of sound pressure squared with time, and thus, to the equal energy hypothesis, the alternative formulation leads to the conclusion that noise-induced hearing loss scales on the integral of pressure with time. Since either formulation adequately describes the data, and the equal energy hypothesis has never been adequately substantiated, use of the latter hypothesis to extend the findings of steady-state exposures to application for unsteady exposures is not justified. The alternative formulation presented here is recommended for consideration.
EGO shape optimization of horn-loaded loudspeakers
Publisher: Springer Science and Business Media LLC
Date: 21-11-2007
Active control of noise transmission through a panel into a cavity: I. Analytical study
Publisher: Acoustical Society of America (ASA)
Date: 05-1990
DOI: 10.1121/1.399555
Abstract: A technique for controlling noise transmitted into the interior of a cavity involves use of point force actuators on the boundary structures. This paper is an analytical study of the nature of the control mechanism. A rectangular panel–cavity system has been used as a model for this study. The test panel was selected so that the resonance frequencies are well separated. The responses of the structural vibration and the cavity sound field are examined under both controlled and uncontrolled conditions. Results obtained demonstrate that there are two different control mechanisms. If the system response is dominated by panel-controlled modes, sound energy in the cavity is minimized by suppressing the panel modes that radiate into the cavity. If the system response is dominated by cavity-controlled modes, the control force is used to change the panel velocity distribution and thus adjust the radiation of each panel mode. In this latter case, the real part of the sound power radiation into the cavity is minimized, but there may be an increased local reactive intensity field and increased panel-vibration level.
Active control of sound transmission using structural error sensing
Publisher: Acoustical Society of America (ASA)
Date: 11-1998
DOI: 10.1121/1.423872
Abstract: The active minimization of harmonic sound transmission into an arbitrarily shaped enclosure using error signals derived from structural vibration sensors is investigated numerically. It is shown that by considering the dynamics of the coupled system, it is possible to derive a set of “structural radiation” modes which are orthogonal with respect to the global potential energy of the coupled acoustic space and which can be sensed by structural vibration sensors. Minimization of the litudes of the “radiation modes” is thus guaranteed to minimize the interior acoustic potential energy. The coupled vibro-acoustic system under investigation is modelled using finite element analysis which allows systems with complex geometries to be investigated rather than limiting the analysis to simple analytically tractable systems. Issues regarding the practical implementation of sensing the orthonormal sets of structural radiation modes are discussed. Specific ex les relating to the minimization of the total acoustic potential energy within a longitudinally stiffened cylinder are given, comparing the performance offered using error sensing of the radiation modes on the structure against the more traditional error criteria namely, the discrete sensing of the structural kinetic energy on the boundary and the acoustic potential energy in the enclosed space.
Engineering Noise Control
Publisher: CRC Press
Date: 21-12-2017
Long-term quantification and characterisation of wind farm noise amplitude modulation
Publisher: Elsevier BV
Date: 09-2021
A study of time-domain FXLMS algorithms with control output constraint
Publisher: Acoustical Society of America (ASA)
Date: 06-2001
DOI: 10.1121/1.1367247
Abstract: A single input, single output active noise control system using the time-domain Filtered-X LMS algorithm with output constraint is investigated. The constraint on the output of the control filter is applied by three different methods: the leakage algorithm based on the transformation method using a penalty function the re-scaling algorithm based on the active set method and the simple practical (clipping) algorithm which just clips the output if a constraint is encountered. A comparison of the three algorithms shows that the re-scaling algorithm can usually work successfully under the constraint, while the leakage algorithm usually needs a large leakage coefficient to satisfy the constraint with a resulting performance loss. The clipping algorithm has potential problems both with the stability and convergence speed.
Approximate solutions and chaotic motions of a piecewise nonlinear–linear oscillator
Publisher: Elsevier BV
Date: 06-2004
Suppression of Maglev Track-Induced Self-Excited Vibration Using an Adaptive Cancellation Algorithm
Publisher: Trans Tech Publications, Ltd.
Date: 12-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.44-47.586
Abstract: The track-induced self-excited vibration is a special problem that exists in EMS (Electromagnetic Suspension) maglev systems. In this paper, the stability of the electromagnet-track coupled model is examined, and it is found that the second order vibration mode of the track may cause instability problem. To suppress the self-excited vibration, an LMS (Least Mean Square) adaptive cancellation scheme is presented, and a phase locked loop is employed to generate a reference signal for the LMS algorithm. Analysis and simulation show that the proposed adaptive cancellation algorithm is effective in suppressing the vibration with unknown frequency.
Optimal virtual sensing for active noise control in a rigid-walled acoustic duct
Publisher: Acoustical Society of America (ASA)
Date: 11-2005
DOI: 10.1121/1.2047127
Abstract: The performance of local active noise control systems is generally limited by the small sizes of the zones of quiet created at the error sensors. This is often exacerbated by the fact that the error sensors cannot always be located close to an observer’s ears. Virtual sensing is a method that can move the zone of quiet away from the physical location of the transducers to a desired location, such as an observer’s ear. In this article, analytical expressions are derived for optimal virtual sensing in a rigid-walled acoustic duct with arbitrary termination conditions. The expressions are derived for tonal excitations, and are obtained by employing a traveling wave model of a rigid-walled acoustic duct. It is shown that the optimal solution for the virtual sensing microphone weights is independent of the source location and microphone locations. It is also shown that, theoretically, it is possible to obtain infinite reductions at the virtual location. The analytical expressions are compared with forward difference prediction techniques. The results demonstrate that the maximum attenuation, that theoretically can be obtained at the virtual location using forward difference prediction techniques, is expected to decrease for higher excitation frequencies and larger virtual distances.
Actuator Design and Deployment
Publisher: Springer New York
Date: 2008
Effect Of End Conditions On The Active Control Of Beam Vibration
Publisher: Elsevier BV
Date: 12-1993
Prediction of Acoustic Loads on a Launch Vehicle Fairing During Liftoff
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 2013
DOI: 10.2514/1.A32324
DDHD2 interacts with STXBP1 to mediate long-term memory via the generation of myristic acid
Publisher: Cold Spring Harbor Laboratory
Date: 11-05-2023
DOI: 10.1101/2023.05.11.540316
Abstract: The phospholipid and free fatty acid (FFA) composition of neuronal membranes plays a crucial role in learning and memory, but the mechanisms through which neuronal activity affects the brain’s lipid landscape remain largely unexplored. Saturated FFAs, particularly myristic acid (C14:0), strongly increase during neuronal stimulation and memory acquisition, suggesting the involvement of phospholipase A1 (PLA1) activity in synaptic plasticity. Here, we show that genetic ablation of the DDHD2 isoform of PLA1 in mice reduced memory performance in reward-based learning and spatial memory models prior to the development of neuromuscular deficits, and markedly reduced saturated FFAs across the brain. DDHD2 was shown to bind to the key synaptic protein STXBP1. Using STXBP1/2 knockout neurosecretory cells and a haploinsufficient STXBP1 +/- mouse model of STXBP1 encephalopathy that is also associated with intellectual disability and motor dysfunction, we show that STXBP1 controls the targeting of DDHD2 to the plasma membrane and the generation of saturated FFAs in the brain. Our findings suggest key roles for DDHD2 and STXBP1 in the lipid metabolism underlying synaptic plasticity, learning and memory.
Vibro-acoustic noise control treatments for payload bays of launch vehicles: Discrete to fuzzy solutions
Publisher: Elsevier BV
Date: 11-2005
Active control analysis of mining vehicle cabin noise using finite element modelling
Publisher: Elsevier BV
Date: 10-2004
Comparison of models for predicting the transmission loss of plenum chambers
Publisher: Elsevier BV
Date: 07-2005
The influence of transducer transfer functions and acoustic time delays on the implementation of the LMS algorithm in active noise control systems
Publisher: Elsevier BV
Date: 09-1990
Applying effort constraints on adaptive feedforward control using the active set method
Publisher: Elsevier BV
Date: 02-2003
Non-linear normal modes and their bifurcation of a two DOF system with quadratic and cubic non-linearity
Publisher: Elsevier BV
Date: 11-2006
Active vibration control of waves in simple structures with multiple error sensors
Publisher: Acoustical Society of America (ASA)
Date: 03-1998
DOI: 10.1121/1.421259
Abstract: A numerical study is carried out to determine the improvement in vibration control of simple structures gained by using two sets rather than one set of error sensors. The structures considered are a beam, a plate, and a cylindrical shell. The control sources are driven to minimize the sum of the mean squared flexural displacement signal from all sensors with the view to reducing downstream vibration transmission. Results show that over a large frequency range there is an overall improvement in downstream attenuation resulting from the introduction of the second set of error sensors for each simple structure.
Estimation of Static Eccentricity Severity in Induction Motors for On-Line Condition Monitoring
Publisher: IEEE
Date: 10-2006
Beyond traditional wind farm noise characterisation using transfer learning
Publisher: Acoustical Society of America (ASA)
Date: 05-2022
DOI: 10.1121/10.0010494
Abstract: This study proposes an approach for the characterisation and assessment of wind farm noise (WFN), which is based on extraction of acoustic features between 125 and 7500 Hz from a pretrained deep learning model (referred to as deep acoustic features). Using data measured at a variety of locations, this study shows that deep acoustic features can be linked to meaningful characteristics of the noise. This study finds that deep acoustic features can reveal an improved spatial and temporal representation of WFN compared to what is revealed using traditional spectral analysis and overall noise descriptors. These results showed that this approach is promising, and thus it could provide the basis for an improved framework for WFN assessment in the future.
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
Intrinsic variability and field statistics for the Vela pulsar - III. Two-component fits and detailed assessment of stochastic growth theory
Publisher: Oxford University Press (OUP)
Date: 08-2003
The Effect of Error Sensor Location and Type on the Active Control of Beam Vibration
Publisher: Elsevier BV
Date: 08-1993
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.
Experiments on active control of sound radiation from a panel using a piezoceramic actuator
Publisher: Elsevier BV
Date: 10-1991
Active noise control of a single-engine light aircraft cabin
Publisher: Acoustical Society of America (ASA)
Date: 05-1998
DOI: 10.1121/1.422365
Abstract: Active noise control (ANC) shows success and potential in a growing number of commercial applications, one of which is aircraft cabin noise reduction. With the exception of utilizing ANC headsets, light aircraft, which to date offer a high noise environment, have been somewhat overlooked. The importance of weight minimization also prevents installing copious quantities of d ening and insulation materials as a passive noise control measure. While headsets are a pilot’s necessity and an obvious target for ‘‘localized’’ noise reduction, they are not conducive to either operator or passenger comfort. High noise levels not only render communication difficult but also contribute toward stress and fatigue. A more globalized region of reduced noise will be less restrictive and no doubt provide the occupants with more freedom of movement and overall comfort. Light aircraft operators boasting quieter cabins with a focus on customer comfort will no doubt have a distinct commercial advantage. Using flight trials and laboratory experiments as a basis, this paper will discuss the introduction of ANC into a four-seater Piper Archer. Existing noise levels, objectives, equipment used, methods of approach, and results to date shall be reviewed, as well as the remaining work required to achieve the final goal.
Experimental determination of the total vibratory power transmission in an elastic beam
Publisher: Acoustical Society of America (ASA)
Date: 08-1998
DOI: 10.1121/1.423335
Abstract: A structure can simultaneously support different types of structural waves. For active control of vibration in a beam structure, it is necessary to consider all wave types simultaneously. Thus it is necessary to be able to measure the vibration litude associated with all wave types at any beam cross section as well as the total vibratory power transmission associated with all wave types. In this paper, the theoretical basis is outlined for a new method which allows measurement of all the required quantities using appropriately oriented and located accelerometers. Experimental results are also provided to illustrate the usefulness of this method.
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.
Structural radiation mode sensing for active control of sound radiation into enclosed spaces
Publisher: Acoustical Society of America (ASA)
Date: 12-1999
DOI: 10.1121/1.428225
Abstract: In the recent article by Cazzolato and Hansen [J. Acoust. Soc. Am. 104, 2878–2889 (1998)] it was shown that it is possible to derive for a structure some set of surface velocity distributions, referred to as radiation modes, which are orthogonal in terms of their contributions to the acoustic potential energy of a coupled cavity. The technique used an orthonormal decomposition to derive an expression for the radiation modes which was based on prior work for free-field sound radiation. It will be shown in the following letter that for the special case involving the calculation of global internal potential energy it is possible to use a simple approach which requires no orthonormal decomposition since the expression for the global potential energy is already in a form that can be easily diagonalized.
Using multiple regression to optimize active noise control system design
Publisher: Elsevier BV
Date: 08-1991
Investigation of Static Eccentricity Fault Frequencies using Multiple Sensors in Induction Motors and Effects of Loading
Publisher: IEEE
Date: 11-2006
Effect of External Excitations on a Nonlinear System with Time Delay
Publisher: Springer Science and Business Media LLC
Date: 09-2005
Design considerations for active noise control systems implementing the multiple input, multiple output lms algorithm
Publisher: Elsevier BV
Date: 11-1992
Active control of total vibratory power flow in a beam. I: Physical system analysis
Publisher: Acoustical Society of America (ASA)
Date: 1991
DOI: 10.1121/1.400502
Abstract: Excitation of a beam may produce a combination of longitudinal, flexural, and torsional waves. The active control of one kind of wave by an actuator may create waves of the other kinds which may not be excited under the uncontrolled conditions. The generation and propagation of each wave in the beam depend upon the distribution of the forces, the geometrical shape and prestress condition of the beam, and the discontinuity and boundary conditions. This paper concentrates on the effect of the excitation and control forces on these waves and the control of the total power flow along a beam of infinite length and rectangular cross section. An expression for the power flow for an arbitrary distributed point excitation force and an arbitrary distributed point control force is obtained. This expression allows a study of the nature of the power flow for each wave under an excitation force and the effect of the control forces on these waves when the total power flow is minimized.
Current and future industrial applications of active noise control
Publisher: Institute of Noise Control Engineering (INCE)
Date: 2005
DOI: 10.3397/1.2839255
Vorticity characteristics of the vibrational intensity field in an actively controlled thin plate
Publisher: Acoustical Society of America (ASA)
Date: 02-1996
DOI: 10.1121/1.414622
Abstract: It is the purpose of this paper to elucidate quantitatively the generation mechanism of structural intensity patterns induced in an actively controlled thin plate vibrating harmonically in a steady state. Particular emphasis is placed upon the vortex-type intensity response pattern, which has a potential for confining the vibration power into a specific area of the plate. First, a formulation is developed for minimizing structural kinetic energy with active vibration control on a planar structure. The results are used to develop expressions for vibration intensity in the controlled structure, which are then used as the basis for investigating intensity distributions in an actively controlled rectangular panel excited harmonically. It is shown that when a vortex pattern exists, the plate response is dominated by two vibration modes. The vibration intensity field associated with these two vibration modes is defined, and both an approximate energy stream function and a vortex function are derived. It is shown that the vibration intensity vector is tangential to the contour of the approximate energy stream function, and that fundamental characteristics such as the number and direction of the vortices can be determined from the approximate energy stream function. Finally, it is found that the major vortex with multiple subvortices inside appearing in the structural intensity field is a derivative or an image of subvortices, and does not carry the characteristics of the vortex from the viewpoint of fluid dynamics.
A moving zone of quiet for narrowband noise in a one-dimensional duct using virtual sensing
Publisher: Acoustical Society of America (ASA)
Date: 03-2007
DOI: 10.1121/1.2431583
Abstract: A frequent problem in active noise control is that the zone of quiet created at the error sensor tends to be very small. This means that the error sensor generally needs to be located close to an observer’s ear, which might not always be a convenient or feasible solution. Virtual sensing is a method that can move the zone of quiet away from the error sensor to a desired location that is spatially fixed. This method has been investigated previously, and has shown potential to improve the performance of an active noise control system. However, it is very likely that the desired location of the zone of quiet is not spatially fixed. An active noise control system incorporating a virtual sensing method thus has to be able to create a moving zone of quiet that tracks the observer’s ears. This paper presents a method for creating a moving zone of quiet based on the LMS virtual microphone technique. To illustrate the proposed method, it is implemented in an acoustic duct and narrowband control results are presented. These results show that a moving zone of quiet was effectively created inside the duct for narrowband noise.
Sound Transmission Loss of Corrugated and Fluted Panels
Publisher: Institute of Noise Control Engineering (INCE)
Date: 1993
DOI: 10.3397/1.2827834
Related Organisations
Related Funding Activities
Discovery Projects - Grant ID: DP0345579
Start Date: 2003
End Date: 12-2006
Amount: $342,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0349117
Start Date: 12-2003
End Date: 12-2006
Amount: $270,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP110100033
Start Date: 06-2011
End Date: 12-2014
Amount: $420,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP1094015
Start Date: 2010
End Date: 12-2013
Amount: $280,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0343396
Start Date: 2003
End Date: 12-2006
Amount: $242,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP120102185
Start Date: 2012
End Date: 12-2016
Amount: $500,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP0453951
Start Date: 04-2004
End Date: 12-2010
Amount: $174,735.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP140100987
Start Date: 05-2015
End Date: 05-2020
Amount: $250,000.00
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 Infrastructure, Equipment And Facilities - Grant ID: LE0560673
Start Date: 2005
End Date: 12-2005
Amount: $377,178.00
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 ActivityDiscovery Projects - Grant ID: DP130103136
Start Date: 2013
End Date: 04-2018
Amount: $440,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE150100094
Start Date: 06-2015
End Date: 12-2018
Amount: $400,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE0668520
Start Date: 2006
End Date: 12-2007
Amount: $560,000.00
Funder: Australian Research Council
View Funded Activity