2022
|
J. Håkansson, W. Jiang, Q. Xue, X.Zheng, M. Ding, A. Agarwal; C. P. H. Elemans Aerodynamics and motor control of ultrasonic vocalizations for social communication in mice and rats Journal Article BMC Biology, 20 (3), pp. 1–15, 2022. Links | BibTeX @article{hakansson2022,
title = {Aerodynamics and motor control of ultrasonic vocalizations for social communication in mice and rats},
author = {J. Håkansson, W. Jiang, Q. Xue, X.Zheng, M. Ding, A. Agarwal and C. P. H. Elemans},
doi = {https://doi.org/10.1186/s12915-021-01185-z},
year = {2022},
date = {2022-01-07},
journal = {BMC Biology},
volume = {20},
number = {3},
pages = {1--15},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2021
|
A. L. Gregory; A. Agarwal; J. Lasenby
An experimental investigation to model wheezing in lungs Journal Article Royal Society Open Science, 8 (2), pp. 1–20, 2021. Abstract | Links | BibTeX @article{Gregory2021,
title = {An experimental investigation to model wheezing in lungs},
author = {A. L. Gregory and A. Agarwal and J. Lasenby
},
doi = {https://doi.org/10.1098/rsos.201951},
year = {2021},
date = {2021-02-24},
journal = {Royal Society Open Science},
volume = {8},
number = {2},
pages = {1--20},
abstract = {A quarter of the world's population experience wheezing. These sounds have been used for diagnosis since the time of the Ebers Papyrus (ca 1500 BC). We know that wheezing is a result of the oscillations of the airways that make up the lung. However, the physical mechanisms for the onset of wheezing remain poorly understood, and we do not have a quantitative model to predict when wheezing occurs. We address these issues in this paper. We model the airways of the lungs by a modified Starling resistor in which airflow is driven through thin, stretched elastic tubes. By completing systematic experiments, we find a generalized ‘tube law’ that describes how the cross-sectional area of the tubes change in response to the transmural pressure difference across them. We find the necessary conditions for the onset of oscillations that represent wheezing and propose a flutter-like instability model for it about a heavily deformed state of the tube. Our findings allow for a predictive tool for wheezing in lungs, which could lead to better diagnosis and treatment of lung diseases.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A quarter of the world's population experience wheezing. These sounds have been used for diagnosis since the time of the Ebers Papyrus (ca 1500 BC). We know that wheezing is a result of the oscillations of the airways that make up the lung. However, the physical mechanisms for the onset of wheezing remain poorly understood, and we do not have a quantitative model to predict when wheezing occurs. We address these issues in this paper. We model the airways of the lungs by a modified Starling resistor in which airflow is driven through thin, stretched elastic tubes. By completing systematic experiments, we find a generalized ‘tube law’ that describes how the cross-sectional area of the tubes change in response to the transmural pressure difference across them. We find the necessary conditions for the onset of oscillations that represent wheezing and propose a flutter-like instability model for it about a heavily deformed state of the tube. Our findings allow for a predictive tool for wheezing in lungs, which could lead to better diagnosis and treatment of lung diseases. |
Martin Thoenes, Anurag Agarwal, David Grundmann, Carmen Ferrero, Andrew McDonald, Peter Bramlage, Richard P. Steeds Narrative review of the role of artificial intelligence to improve aortic valve disease management Journal Article Journal of Thoracic Disease, 13 (1), pp. 396-404, 2021, ISSN: 2077-6624. Abstract | Links | BibTeX @article{Thoenes2021,
title = {Narrative review of the role of artificial intelligence to improve aortic valve disease management},
author = {Martin Thoenes, Anurag Agarwal, David Grundmann, Carmen Ferrero, Andrew McDonald, Peter Bramlage, Richard P. Steeds},
url = {https://jtd.amegroups.com/article/view/48267/html},
doi = {10.21037/jtd-20-1837},
issn = {2077-6624},
year = {2021},
date = {2021-01-01},
journal = {Journal of Thoracic Disease},
volume = {13},
number = {1},
pages = {396-404},
abstract = {Valvular heart disease (VHD) is a chronic progressive condition with an increasing prevalence in the Western world due to aging populations. VHD is often diagnosed at a late stage when patients are symptomatic and the outcomes of therapy, including valve replacement, may be sub-optimal due the development of secondary complications, including left ventricular (LV) dysfunction. The clinical application of artificial intelligence (AI), including machine learning (ML), has promise in supporting not only early and more timely diagnosis, but also hastening patient referral and ensuring optimal treatment of VHD. As physician auscultation lacks accuracy in diagnosis of significant VHD, computer-aided auscultation (CAA) with the help of a commercially available digital stethoscopes improves the detection and classification of heart murmurs. Although used little in current clinical practice, CAA can screen large populations at low cost with high accuracy for VHD and faciliate appropriate patient referral. Echocardiography remains the next step in assessment and planning management and AI is delivering major changes in speeding training, improving image quality by pattern recognition and image sorting, as well as automated measurement of multiple variables, thereby improving accuracy. Furthermore, AI then has the potential to hasten patient disposal, by automated alerts for red-flag findings, as well as decision support in dealing with results. In management, there is great potential in ML-enabled tools to support comprehensive disease monitoring and individualized treatment decisions. Using data from multiple sources, including demographic and clinical risk data to image variables and electronic reports from electronic medical records, specific patient phenotypes may be identified that are associated with greater risk or modeled to the estimate trajectory of VHD progression. Finally, AI algorithms are of proven value in planning intervention, facilitating transcatheter valve replacement by automated measurements of anatomical dimensions derived from imaging data to improve valve selection, valve size and method of delivery.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Valvular heart disease (VHD) is a chronic progressive condition with an increasing prevalence in the Western world due to aging populations. VHD is often diagnosed at a late stage when patients are symptomatic and the outcomes of therapy, including valve replacement, may be sub-optimal due the development of secondary complications, including left ventricular (LV) dysfunction. The clinical application of artificial intelligence (AI), including machine learning (ML), has promise in supporting not only early and more timely diagnosis, but also hastening patient referral and ensuring optimal treatment of VHD. As physician auscultation lacks accuracy in diagnosis of significant VHD, computer-aided auscultation (CAA) with the help of a commercially available digital stethoscopes improves the detection and classification of heart murmurs. Although used little in current clinical practice, CAA can screen large populations at low cost with high accuracy for VHD and faciliate appropriate patient referral. Echocardiography remains the next step in assessment and planning management and AI is delivering major changes in speeding training, improving image quality by pattern recognition and image sorting, as well as automated measurement of multiple variables, thereby improving accuracy. Furthermore, AI then has the potential to hasten patient disposal, by automated alerts for red-flag findings, as well as decision support in dealing with results. In management, there is great potential in ML-enabled tools to support comprehensive disease monitoring and individualized treatment decisions. Using data from multiple sources, including demographic and clinical risk data to image variables and electronic reports from electronic medical records, specific patient phenotypes may be identified that are associated with greater risk or modeled to the estimate trajectory of VHD progression. Finally, AI algorithms are of proven value in planning intervention, facilitating transcatheter valve replacement by automated measurements of anatomical dimensions derived from imaging data to improve valve selection, valve size and method of delivery. |
2020
|
U. Karban;
B. Bugeat and
E. Martini and
A. Towne and
A. V. G. Cavalieri and
L. Lesshafft and
A. Agarwal and
P. Jordan
and
T. Colonius Ambiguity in mean-flow-based linear analysis Journal Article Journal of Fluid Mechanics, 900 (R5), 2020. Abstract | Links | BibTeX @article{Karban2020,
title = {Ambiguity in mean-flow-based linear analysis},
author = {U. Karban and
B. Bugeat and
E. Martini and
A. Towne and
A. V. G. Cavalieri and
L. Lesshafft and
A. Agarwal and
P. Jordan
and
T. Colonius},
url = {https://doi.org/10.1017/jfm.2020.566},
doi = {10.1017/jfm.2020.566},
year = {2020},
date = {2020-08-06},
journal = {Journal of Fluid Mechanics},
volume = {900},
number = {R5},
abstract = {Linearisation of the Navier–Stokes equations about the mean of a turbulent flow forms the foundation of popular models for energy amplification and coherent structures, including resolvent analysis. While the Navier–Stokes equations can be equivalently written using many different sets of dependent variables, we show that the properties of the linear operator obtained via linearisation about the mean depend on the variables in which the equations are written prior to linearisation, and can be modified under nonlinear transformation of variables. For example, we show that using primitive and conservative variables leads to differences in the singular values and modes of the resolvent operator for turbulent jets, and that the differences become more severe as variable-density effects increase. This lack of uniqueness of mean-flow-based linear analysis provides new opportunities for optimising models by specific choice of variables while also highlighting the importance of carefully accounting for the nonlinear terms that act as a forcing on the resolvent operator.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Linearisation of the Navier–Stokes equations about the mean of a turbulent flow forms the foundation of popular models for energy amplification and coherent structures, including resolvent analysis. While the Navier–Stokes equations can be equivalently written using many different sets of dependent variables, we show that the properties of the linear operator obtained via linearisation about the mean depend on the variables in which the equations are written prior to linearisation, and can be modified under nonlinear transformation of variables. For example, we show that using primitive and conservative variables leads to differences in the singular values and modes of the resolvent operator for turbulent jets, and that the differences become more severe as variable-density effects increase. This lack of uniqueness of mean-flow-based linear analysis provides new opportunities for optimising models by specific choice of variables while also highlighting the importance of carefully accounting for the nonlinear terms that act as a forcing on the resolvent operator. |
2019
|
M. Nussbaumer; L. T. Martinez; A. Agarwal A theory for stethoscope acoustics Inproceedings Proceedings of the 23rd international congress on acoustics, pp. 4991–4998, 2019, (Best Student Paper Award). Abstract | Links | BibTeX @inproceedings{NTA19,
title = {A theory for stethoscope acoustics},
author = {M. Nussbaumer and L. T. Martinez and A. Agarwal},
url = {http://pub.dega-akustik.de/ICA2019/data/articles/000180.pdf},
year = {2019},
date = {2019-09-09},
booktitle = {Proceedings of the 23rd international congress on acoustics},
pages = {4991--4998},
abstract = {Maximising the signal to noise ratio while considering ergonomics and aesthetics is the key design challenge for modern stethoscopes. In order to optimise the design, there is a need for a well-validated model for the transfer function from a source within the chest to the output signal obtained. Most variants of the stethoscope are air- coupled sensors. Here we propose a new theory for the acoustics of this type of sensor, which takes into account the coupling between the sensor and the human chest. We have conducted rigorous experiments to characterise the transfer function of the chest-stethoscope system and have investigated the effects of key design parameters. Our data confirms traditional findings on the effects of bell geometry and diaphragm usage, but also highlights the importance of the coupling between the sensor and the chest, and reveals features of the transfer function that are not captured by existing models. Our model employs a transmission matrix formulation and discretises the system into lumped element components. It can be used to inform design choices for acoustic, electronic and dual-mode stethoscopes, opening up the possibility of an optimum design that maximises the signal to noise ratio for a desired application.},
note = {Best Student Paper Award},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Maximising the signal to noise ratio while considering ergonomics and aesthetics is the key design challenge for modern stethoscopes. In order to optimise the design, there is a need for a well-validated model for the transfer function from a source within the chest to the output signal obtained. Most variants of the stethoscope are air- coupled sensors. Here we propose a new theory for the acoustics of this type of sensor, which takes into account the coupling between the sensor and the human chest. We have conducted rigorous experiments to characterise the transfer function of the chest-stethoscope system and have investigated the effects of key design parameters. Our data confirms traditional findings on the effects of bell geometry and diaphragm usage, but also highlights the importance of the coupling between the sensor and the chest, and reveals features of the transfer function that are not captured by existing models. Our model employs a transmission matrix formulation and discretises the system into lumped element components. It can be used to inform design choices for acoustic, electronic and dual-mode stethoscopes, opening up the possibility of an optimum design that maximises the signal to noise ratio for a desired application. |
2018
|
Sam Phillips; Anurag Agarwal; Peter Jordan The annoying dripping tap Journal Article Physics Today, 71 (12), pp. 70-71, 2018. Abstract | Links | BibTeX @article{PAJPh18,
title = {The annoying dripping tap},
author = {Sam Phillips and Anurag Agarwal and Peter Jordan},
doi = {10.1063/PT.3.4100},
year = {2018},
date = {2018-12-01},
journal = {Physics Today},
volume = {71},
number = {12},
pages = {70-71},
abstract = {Whether produced by a leaky tap dripping into a sink or by raindrops falling onto a lake, the distinctive and at times irritating plink of a small drop falling into a larger body of liquid has been the subject of scientific curiosity for more than a century. In 1989 Hugh Pumphrey and colleagues determined that the source of the sound is a pulsating air bubble trapped under the surface of the water during the drop impact. However, until recently it was not clear just how the underwater bubble produces the plink heard above water by the human ear. In this Quick Study we describe a project that took advantage of devices unavailable to Pumphrey to better understand how the bubble generates its characteristic sound.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Whether produced by a leaky tap dripping into a sink or by raindrops falling onto a lake, the distinctive and at times irritating plink of a small drop falling into a larger body of liquid has been the subject of scientific curiosity for more than a century. In 1989 Hugh Pumphrey and colleagues determined that the source of the sound is a pulsating air bubble trapped under the surface of the water during the drop impact. However, until recently it was not clear just how the underwater bubble produces the plink heard above water by the human ear. In this Quick Study we describe a project that took advantage of devices unavailable to Pumphrey to better understand how the bubble generates its characteristic sound. |
Peter Jordan, Vincent Jaunet, Aaron Towne, André VG Cavalieri, Tim Colonius, Oliver Schmidt, Anurag Agarwal Jet–flap interaction tones Journal Article Journal of Fluid Mechanics, 853 , pp. Pages, 2018. Abstract | Links | BibTeX @article{JVT18,
title = {Jet–flap interaction tones},
author = {Peter Jordan, Vincent Jaunet, Aaron Towne, André VG Cavalieri, Tim Colonius, Oliver Schmidt, Anurag Agarwal},
doi = {10.1017/jfm.2018.566},
year = {2018},
date = {2018-10-01},
journal = {Journal of Fluid Mechanics},
volume = {853},
pages = { Pages},
abstract = {Motivated by the problem of jet–flap interaction noise, we study the tonal dynamics that occurs when an isothermal turbulent jet grazes a sharp edge. We perform hydrodynamic and acoustic pressure measurements to characterise the tones as a function of Mach number and streamwise edge position. The observed distribution of spectral peaks cannot be explained using the usual edge-tone model, in which resonance is underpinned by coupling between downstream-travelling Kelvin–Helmholtz wavepackets and upstream-travelling sound waves. We show, rather, that the strongest tones are due to coupling between Kelvin–Helmholtz wavepackets and a family of trapped, upstream-travelling acoustic modes in the potential core, recently studied by Towne et al. (J. Fluid Mech. vol. 825, 2017) and Schmidt et al. (J. Fluid Mech. vol. 825, 2017). We also study the band-limited nature of the resonance, showing the high-frequency cutoff to be due to the frequency dependence of the upstream-travelling waves. Specifically, at high Mach number, these modes become evanescent above a certain frequency, whereas at low Mach number they become progressively trapped with increasing frequency, which inhibits their reflection in the nozzle plane.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Motivated by the problem of jet–flap interaction noise, we study the tonal dynamics that occurs when an isothermal turbulent jet grazes a sharp edge. We perform hydrodynamic and acoustic pressure measurements to characterise the tones as a function of Mach number and streamwise edge position. The observed distribution of spectral peaks cannot be explained using the usual edge-tone model, in which resonance is underpinned by coupling between downstream-travelling Kelvin–Helmholtz wavepackets and upstream-travelling sound waves. We show, rather, that the strongest tones are due to coupling between Kelvin–Helmholtz wavepackets and a family of trapped, upstream-travelling acoustic modes in the potential core, recently studied by Towne et al. (J. Fluid Mech. vol. 825, 2017) and Schmidt et al. (J. Fluid Mech. vol. 825, 2017). We also study the band-limited nature of the resonance, showing the high-frequency cutoff to be due to the frequency dependence of the upstream-travelling waves. Specifically, at high Mach number, these modes become evanescent above a certain frequency, whereas at low Mach number they become progressively trapped with increasing frequency, which inhibits their reflection in the nozzle plane. |
S. Phillips, A. Agarwal, P. Jordan The sound produced by a dripping tap is driven by resonant oscillations of an entrapped air bubble Journal Article Scientific Reports, 8 (1), pp. 1-12, 2018. Abstract | Links | BibTeX @article{PAJ18,
title = {The sound produced by a dripping tap is driven by resonant oscillations of an entrapped air bubble},
author = {S. Phillips, A. Agarwal, P. Jordan},
doi = {10.1038/s41598-018-27913-0},
year = {2018},
date = {2018-06-22},
journal = {Scientific Reports},
volume = {8},
number = {1},
pages = {1-12},
abstract = {This paper details an investigation into the characteristic ‘plink’ sound produced by water droplets impacting a liquid surface, such as those falling from a dripping tap. Modern high-speed video and audio capture techniques have been applied to this problem for the first time. Previous literature investigating the underwater sound produced has been validated, with the key sound producing feature both above and below the water confirmed to be the entrainment of a small underwater air bubble. Recorded sound frequencies have been shown to align with the theoretical natural oscillation frequency of the entrained bubble, confirming this to be the driver of the characteristic ‘plink’ sound. For the first time these oscillations of the entrained bubble have been directly observed on video footage. An investigation into the effect of underwater reverberation showed that the airborne sound field is not simply the underwater field propagating through the water-air interface, as had previously been assumed. An alternative hypothesis is that the oscillating bubble induces oscillations of the water surface itself, giving a more efficient mechanism by which the underwater bubble drives the airborne sound field. A model for this new hypothesis produces good agreement with experimental data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper details an investigation into the characteristic ‘plink’ sound produced by water droplets impacting a liquid surface, such as those falling from a dripping tap. Modern high-speed video and audio capture techniques have been applied to this problem for the first time. Previous literature investigating the underwater sound produced has been validated, with the key sound producing feature both above and below the water confirmed to be the entrainment of a small underwater air bubble. Recorded sound frequencies have been shown to align with the theoretical natural oscillation frequency of the entrained bubble, confirming this to be the driver of the characteristic ‘plink’ sound. For the first time these oscillations of the entrained bubble have been directly observed on video footage. An investigation into the effect of underwater reverberation showed that the airborne sound field is not simply the underwater field propagating through the water-air interface, as had previously been assumed. An alternative hypothesis is that the oscillating bubble induces oscillations of the water surface itself, giving a more efficient mechanism by which the underwater bubble drives the airborne sound field. A model for this new hypothesis produces good agreement with experimental data. |
2017
|
A. L. Gregory, A. Agarwal, J. Lasenby Using geometric algebra to represent curvature in shell theory with applications to Starling resistors Journal Article Royal Society Open Science, 4 (171212), pp. 1-13, 2017. Abstract | Links | BibTeX @article{GAL17b,
title = {Using geometric algebra to represent curvature in shell theory with applications to Starling resistors},
author = {A. L. Gregory, A. Agarwal, J. Lasenby},
doi = {10.1098/rsos.171212},
year = {2017},
date = {2017-11-29},
journal = {Royal Society Open Science},
volume = {4},
number = {171212},
pages = {1-13},
abstract = {We present a novel application of rotors in geometric algebra to represent the change of curvature tensor that is used in shell theory as part of the constitutive law. We introduce a new decomposition of the change of curvature tensor, which has explicit terms for changes of curvature due to initial curvature combined with strain, and changes in rotation over the surface. We use this decomposition to perform a scaling analysis of the relative importance of bending and stretching in flexible tubes undergoing self-excited oscillations. These oscillations have relevance to the lung, in which it is believed that they are responsible for wheezing. The new analysis is necessitated by the fact that the working fluid is air, compared to water in most previous work. We use stereographic imaging to empirically measure the relative importance of bending and stretching energy in observed self-excited oscillations. This enables us to validate our scaling analysis. We show that bending energy is dominated by stretching energy, and the scaling analysis makes clear that this will remain true for tubes in the airways of the lung.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present a novel application of rotors in geometric algebra to represent the change of curvature tensor that is used in shell theory as part of the constitutive law. We introduce a new decomposition of the change of curvature tensor, which has explicit terms for changes of curvature due to initial curvature combined with strain, and changes in rotation over the surface. We use this decomposition to perform a scaling analysis of the relative importance of bending and stretching in flexible tubes undergoing self-excited oscillations. These oscillations have relevance to the lung, in which it is believed that they are responsible for wheezing. The new analysis is necessitated by the fact that the working fluid is air, compared to water in most previous work. We use stereographic imaging to empirically measure the relative importance of bending and stretching energy in observed self-excited oscillations. This enables us to validate our scaling analysis. We show that bending energy is dominated by stretching energy, and the scaling analysis makes clear that this will remain true for tubes in the airways of the lung. |
A. Gregory; A. Agarwal; J. Lasenby Using Geometric Algebra to understand bending in the deformation of flexible tubes Conference 11th International Conference on Clifford Algebras and Their Applications in Mathematical Physics, Ghent, Belgium, 2017. BibTeX @conference{GAL17,
title = {Using Geometric Algebra to understand bending in the deformation of flexible tubes},
author = {A. Gregory and A. Agarwal and J. Lasenby},
year = {2017},
date = {2017-08-07},
booktitle = {11th International Conference on Clifford Algebras and Their Applications in Mathematical Physics},
address = {Ghent, Belgium},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
E. Kay; A. Agarwal DropConnected neural networks trained on time-frequency and inter-beat features for classifying heart sounds Journal Article Physiological Measurement, 38 (8), pp. 1645-1657, 2017. Links | BibTeX @article{KA17,
title = {DropConnected neural networks trained on time-frequency and inter-beat features for classifying heart sounds},
author = {E. Kay and A. Agarwal},
doi = {doi.org/10.1088/1361-6579/aa6a3d},
year = {2017},
date = {2017-07-31},
journal = {Physiological Measurement},
volume = {38},
number = {8},
pages = {1645-1657},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Z. Fu; A. Agarwal; A.V.G. Cavalieri; P. Jordan; G. A. Bres Turbulent jet noise in the absence of coherent structures Journal Article Physical Review Fluids, 2 (6), pp. 064601, 2017. Links | BibTeX @article{FAC+17,
title = {Turbulent jet noise in the absence of coherent structures},
author = {Z. Fu and A. Agarwal and A.V.G. Cavalieri and P. Jordan and G. A. Bres},
doi = {10.1103/PhysRevFluids.2.064601},
year = {2017},
date = {2017-06-01},
journal = {Physical Review Fluids},
volume = {2},
number = {6},
pages = {064601},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
A. L. Gregory; J. Lasenby; A. Agarwal The elastic theory of shells using geometric algebra Journal Article Royal Society Open Science, 4 (170065), pp. 1-15, 2017. Links | BibTeX @article{GLA17,
title = {The elastic theory of shells using geometric algebra},
author = {A. L. Gregory and J. Lasenby and A. Agarwal},
doi = {10.1098/rsos.170065},
year = {2017},
date = {2017-03-08},
journal = {Royal Society Open Science},
volume = {4},
number = {170065},
pages = {1-15},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
T. A. Grimble; A. Agarwal; M. P. Juniper Local linear stability analysis of cyclone separators Journal Article Journal of Fluid Mechanics, 816 , pp. 507-538, 2017. Links | BibTeX @article{GAJ17,
title = {Local linear stability analysis of cyclone separators},
author = {T. A. Grimble and A. Agarwal and M. P. Juniper},
doi = {10.1017/jfm.2017.89},
year = {2017},
date = {2017-03-08},
journal = {Journal of Fluid Mechanics},
volume = {816},
pages = {507-538},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
2016
|
K. Kanjere; L. Desvard; F. Nicolas; R. H. Henrywood; A. Agarwal Empirical modelling of noise from high aspect ratio rectangular jets Journal Article International Journal of Heat and Fluid Flow, 62 (A), pp. 1-9, 2016. BibTeX @article{KDN+16,
title = {Empirical modelling of noise from high aspect ratio rectangular jets},
author = {K. Kanjere and L. Desvard and F. Nicolas and R. H. Henrywood and A. Agarwal},
year = {2016},
date = {2016-10-05},
journal = {International Journal of Heat and Fluid Flow},
volume = {62},
number = {A},
pages = {1-9},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
M. Nussbaumer; A. Agarwal Aeroacoustics of free reeds Conference 24th International Congress on Acoustics, Buenos Aires, 2016, (8pp). BibTeX @conference{Nussb2016,
title = {Aeroacoustics of free reeds},
author = {M. Nussbaumer and A. Agarwal},
year = {2016},
date = {2016-09-01},
booktitle = {24th International Congress on Acoustics, Buenos Aires},
pages = {1--8},
note = {8pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
J. Cesonis; A. Agarwal; C. B. Palma; A.V.G. Cavalieri Acoustics of tearing velcro Conference 24th International Congress on Acoustics, Buenos Aires, 2016, (8pp). BibTeX @conference{Cesonis2016,
title = {Acoustics of tearing velcro},
author = {J. Cesonis and A. Agarwal and C. B. Palma and A.V.G. Cavalieri},
year = {2016},
date = {2016-09-01},
booktitle = {24th International Congress on Acoustics, Buenos Aires},
pages = {1--8},
note = {8pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
E. Kay; A. Agarwal Mitral valve honks Conference 24th International Congress of Theoretical and Applied Mechanics,
Montreal, 2016, (2pp). BibTeX @conference{KayMontreal2016,
title = {Mitral valve honks},
author = {E. Kay and A. Agarwal},
year = {2016},
date = {2016-08-01},
booktitle = {24th International Congress of Theoretical and Applied Mechanics,
Montreal},
pages = {1--2},
note = {2pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
Z. Fu; A. Agarwal; A.V.G Cavalieri; P. Jordan On removing the near field coherent structures in a jet and its impact on the radiated sound Conference 22nd AIAA/CEAS Aeroacoustics Conference, Lyon, 2016, (15pp). BibTeX @conference{zhidong2016a,
title = {On removing the near field coherent structures in a jet and its impact on the radiated sound},
author = {Z. Fu and A. Agarwal and A.V.G Cavalieri and P. Jordan},
year = {2016},
date = {2016-06-01},
booktitle = {22nd AIAA/CEAS Aeroacoustics Conference, Lyon},
pages = {1--18},
note = {15pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
Z. Fu; A. Agarwal; A.V.G Cavalieri; P. Jordan Jet noise reduction through filtering small-scale structures Conference 22nd AIAA/CEAS Aeroacoustics Conference, Lyon, 2016, (15pp). BibTeX @conference{zhidong2016b,
title = {Jet noise reduction through filtering small-scale structures},
author = {Z. Fu and A. Agarwal and A.V.G Cavalieri and P. Jordan},
year = {2016},
date = {2016-06-01},
booktitle = {22nd AIAA/CEAS Aeroacoustics Conference, Lyon},
pages = {1--18},
note = {15pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
E. Mahrt; A. Agarwal; D. Perkel; C. Portfors; C.P.H.
Elemans Mice produce ultrasonic vocalizations by intra-laryngeal planar
impinging jets Journal Article Current Biology, 26 (R1--R3), 2016. BibTeX @article{mice2016,
title = {Mice produce ultrasonic vocalizations by intra-laryngeal planar
impinging jets},
author = {E. Mahrt and A. Agarwal and D. Perkel and C. Portfors and C.P.H.
Elemans},
year = {2016},
date = {2016-01-01},
journal = {Current Biology},
volume = {26},
number = {R1--R3},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
C. Rosser; A. Agarwal Acoustics of suction Journal Article Acta Acustica unified with Acustica, 102 (5), pp. 861–868, 2016, (8pp). BibTeX @article{Rosser2016,
title = {Acoustics of suction},
author = {C. Rosser and A. Agarwal},
year = {2016},
date = {2016-01-01},
journal = {Acta Acustica unified with Acustica},
volume = {102},
number = {5},
pages = {861--868},
note = {8pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
T. J. Newman; A. Agarwal; A. P. Dowling; L. Desvard A sound power measurement technique optimised for low-speed fan tones Journal Article International Journal of Aeroacoustics, 15 , pp. 59–80, 2016, (22pp). BibTeX @article{Newman2016,
title = {A sound power measurement technique optimised for low-speed fan tones},
author = {T. J. Newman and A. Agarwal and A. P. Dowling and L. Desvard},
year = {2016},
date = {2016-01-01},
journal = {International Journal of Aeroacoustics},
volume = {15},
pages = {59--80},
note = {22pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
E. Kay; A. Agarwal DropConnected neural network trained with diverse features for classifying heart sounds Conference 17th Annual Computing in Cardiology Challenge, Vancouver, 2016, (4pp). BibTeX @conference{KayVancouver2016,
title = {DropConnected neural network trained with diverse features for classifying heart sounds},
author = {E. Kay and A. Agarwal},
year = {2016},
date = {2016-01-01},
booktitle = {17th Annual Computing in Cardiology Challenge, Vancouver},
pages = {1--4},
note = {4pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
A. L. Gregory; A. Agarwal Modelling biological phenomena with rocket balloon buzz Conference 24th International Congress of Theoretical and Applied Mechanics,
Montreal, 2016, (2pp). BibTeX @conference{GregoryMontreal2016,
title = {Modelling biological phenomena with rocket balloon buzz},
author = {A. L. Gregory and A. Agarwal},
year = {2016},
date = {2016-01-01},
booktitle = {24th International Congress of Theoretical and Applied Mechanics,
Montreal},
pages = {1--2},
note = {2pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
R. H. Henrywood; A. Agarwal; K. Kanjere The aeroacoustics of a subsonic rectangular jet Conference 22nd AIAA/CEAS Aeroacoustics Conference, Lyon, 2016, (18pp). BibTeX @conference{ross2016,
title = {The aeroacoustics of a subsonic rectangular jet},
author = {R. H. Henrywood and A. Agarwal and K. Kanjere},
year = {2016},
date = {2016-01-01},
booktitle = {22nd AIAA/CEAS Aeroacoustics Conference, Lyon},
pages = {1--18},
note = {18pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
2015
|
Zhidong, F.; Agarwal, A.; Cavalieri, A. V. G.; Jordan, P. Extracting Coherent Structures to Explore the Minimum Jet Noise Conference IUTAM Proceedings on Advances in Computation Modeling and Control of
Transitional and Turbulent Flows, Goa, India, 2015, (6pp). BibTeX @conference{FuGoa2015,
title = {Extracting Coherent Structures to Explore the Minimum Jet Noise},
author = {Zhidong, F. and Agarwal, A. and Cavalieri, A. V. G. and Jordan, P.},
year = {2015},
date = {2015-09-01},
booktitle = {IUTAM Proceedings on Advances in Computation Modeling and Control of
Transitional and Turbulent Flows, Goa, India},
pages = {9390--9395},
note = {6pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
Gregory, A.; Sinayoko, S.; Agarwal, A.; Lasenby, J. Geometric algebra and an acoustic space time for propagation in non-uniform flow Conference 22nd International Congress on Sound and Vibration, Florence, 2015, (8pp). BibTeX @conference{Gregory2015,
title = {Geometric algebra and an acoustic space time for propagation in non-uniform flow},
author = {Gregory, A. and Sinayoko, S. and Agarwal, A. and Lasenby, J.},
year = {2015},
date = {2015-07-01},
booktitle = {22nd International Congress on Sound and Vibration, Florence},
pages = {1--8},
note = {8pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
Kanjere, K.; Desvard, L.; Henrywood, H.; Agarwal, A. Empirical Modelling of Noise from High Aspect Ratio Jets Conference 5th International Conference on Jets Wakes and Separated
Flows, Stockholm, 2015, (6pp). BibTeX @conference{Kon2015,
title = {Empirical Modelling of Noise from High Aspect Ratio Jets},
author = {Kanjere, K. and Desvard, L. and Henrywood, H. and Agarwal, A.},
year = {2015},
date = {2015-06-01},
booktitle = {5th International Conference on Jets Wakes and Separated
Flows, Stockholm},
pages = {1--6},
note = {6pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
T. Grimble; A. Agarwal Characterisation of acoustically linked oscillations in cyclone separators Journal Article Journal of Fluid Mechanics, 780 , pp. 45–59, 2015, (15pp). BibTeX @article{Grimble2015,
title = {Characterisation of acoustically linked oscillations in cyclone separators},
author = {T. Grimble and A. Agarwal},
year = {2015},
date = {2015-01-01},
journal = {Journal of Fluid Mechanics},
volume = {780},
pages = {45--59},
note = {15pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Baqui, Y. B.; Agarwal, A.; Cavalieri, A. V. G.; Sinayoko, S. A coherence-matched linear source mechanism for subsonic jet noise Journal Article Journal of Fluid Mechanics, 776 , pp. 235–267, 2015, (33pp). BibTeX @article{baqui2015coherence,
title = {A coherence-matched linear source mechanism for subsonic jet noise},
author = {Baqui, Y. B. and Agarwal, A. and Cavalieri, A. V. G. and Sinayoko, S.},
year = {2015},
date = {2015-01-01},
journal = {Journal of Fluid Mechanics},
volume = {776},
pages = {235--267},
note = {33pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Gregory, A. L.; Sinayoko, S.; Agarwal, A.; Lasenby, J. An acoustic space-time and the Lorentz transformation in aeroacoustics Journal Article International Journal of Aeroacoustics, 14 (7), pp. 1–27, 2015, (27pp). BibTeX @article{gregory_acoustic_2015,
title = {An acoustic space-time and the Lorentz transformation in aeroacoustics},
author = {Gregory, A. L. and Sinayoko, S. and Agarwal, A. and Lasenby, J.},
year = {2015},
date = {2015-01-01},
journal = {International Journal of Aeroacoustics},
volume = {14},
number = {7},
pages = {1--27},
note = {27pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Zhidong, F.; Agarwal, A.; Cavalieri, A. V. G.; Jordan, P. On filtering coherent structures in jets and its impact on jet noise Conference 22nd International Congress on Sound and Vibration, Florence, 2015, (8pp). BibTeX @conference{Fu2015,
title = {On filtering coherent structures in jets and its impact on jet noise},
author = {Zhidong, F. and Agarwal, A. and Cavalieri, A. V. G. and Jordan, P.},
year = {2015},
date = {2015-01-01},
booktitle = {22nd International Congress on Sound and Vibration, Florence},
pages = {1--8},
note = {8pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
M. Karlsson; A. Agarwal Linear stability analysis of in-duct deep cavities Conference Proceedings, Inter-Noise, Dubrovnik, Croatia, 2015, (11pp). BibTeX @conference{karlsson2015,
title = {Linear stability analysis of in-duct deep cavities},
author = {M. Karlsson and A. Agarwal},
year = {2015},
date = {2015-01-01},
booktitle = {Proceedings, Inter-Noise, Dubrovnik, Croatia},
pages = {381--391},
note = {11pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
2014
|
T. Grimble; A. Agarwal; M. P. Juniper Aeroacoustics of cyclone separators Conference 10th European Fluid Mechanics Conference, Copenhagen, 2014, (1pp). BibTeX @conference{tom2014,
title = {Aeroacoustics of cyclone separators},
author = {T. Grimble and A. Agarwal and M. P. Juniper},
year = {2014},
date = {2014-09-01},
booktitle = {10th European Fluid Mechanics Conference, Copenhagen},
pages = {1},
note = {1pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
E. Kay; A. Agarwal; A. Cavalieri The effect of base-flow changes on Kelvin-Ħelmholtz instability and
noise radiation in jets Conference 20th AIAA/CEAS Aeroacoustics Conference, Atlanta, 2014, (26pp). BibTeX @conference{kay2014,
title = {The effect of base-flow changes on Kelvin-Ħelmholtz instability and
noise radiation in jets},
author = {E. Kay and A. Agarwal and A. Cavalieri},
year = {2014},
date = {2014-06-01},
booktitle = {20th AIAA/CEAS Aeroacoustics Conference, Atlanta},
pages = {1--26},
note = {26pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
R. H. Henrywood; A. Agarwal; H. Babinsky An experimental investigation into noise radiation from thin
rectangular jets Conference 20th AIAA/CEAS Aeroacoustics Conference, Atlanta, 2014, (18pp). BibTeX @conference{ross2014,
title = {An experimental investigation into noise radiation from thin
rectangular jets},
author = {R. H. Henrywood and A. Agarwal and H. Babinsky},
year = {2014},
date = {2014-06-01},
booktitle = {20th AIAA/CEAS Aeroacoustics Conference, Atlanta},
pages = {1--18},
note = {18pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
M. Zhang, P. Jordan, G. Lehnasch, A. V. G. Cavalieri, A. Agarwal Just enough jitter for jet noise? Conference 20th AIAA/CEAS Aeroacoustics Conference, Atlanta, 2014, (20pp). BibTeX @conference{zhang2014,
title = {Just enough jitter for jet noise?},
author = {M. Zhang, P. Jordan, G. Lehnasch, A. V. G. Cavalieri, A. Agarwal},
year = {2014},
date = {2014-06-01},
booktitle = {20th AIAA/CEAS Aeroacoustics Conference, Atlanta},
pages = {1--20},
note = {20pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
Y. B. Baqui; A. Agarwal; A. V. G. Cavalieri A coherence-matched linear model for subsonic jet noise Conference 20th AIAA/CEAS Aeroacoustics Conference, Atlanta, 2014, (11pp). BibTeX @conference{yamin2014,
title = {A coherence-matched linear model for subsonic jet noise},
author = {Y. B. Baqui and A. Agarwal and A. V. G. Cavalieri},
year = {2014},
date = {2014-06-01},
booktitle = {20th AIAA/CEAS Aeroacoustics Conference, Atlanta},
pages = {1--11},
note = {11pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
T. J. Newman; A. Agarwal; A. P. Dowling Tonal noise generation mechanisms in low-speed mixed-flow fans Conference 20th AIAA/CEAS Aeroacoustics Conference, Atlanta, 2014, (14pp). BibTeX @conference{tim2014,
title = {Tonal noise generation mechanisms in low-speed mixed-flow fans},
author = {T. J. Newman and A. Agarwal and A. P. Dowling},
year = {2014},
date = {2014-06-01},
booktitle = {20th AIAA/CEAS Aeroacoustics Conference, Atlanta},
pages = {1--14},
note = {14pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
A. V. G. Cavalieri; A. Agarwal Coherence decay and its impact on sound radiation by wavepackets Journal Article Journal of Fluid Mechanics, 748 , pp. 399–415, 2014, (17pp). BibTeX @article{CavalieriAgarwal2014,
title = {Coherence decay and its impact on sound radiation by wavepackets},
author = {A. V. G. Cavalieri and A. Agarwal},
year = {2014},
date = {2014-01-01},
journal = {Journal of Fluid Mechanics},
volume = {748},
pages = {399--415},
note = {17pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
A. Agarwal; S. Sinayoko; R. D. Sandberg On the wavenumber spectra for sound within subsonic jets Journal Article Journal of Acoustical Society of America, 136 (3), pp. 1029 – 1035, 2014, (7pp). BibTeX @article{Agarwal2014,
title = {On the wavenumber spectra for sound within subsonic jets},
author = {A. Agarwal and S. Sinayoko and R. D. Sandberg},
year = {2014},
date = {2014-01-01},
journal = {Journal of Acoustical Society of America},
volume = {136},
number = {3},
pages = {1029 -- 1035},
note = {7pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
C. Rosser; A. Agarwal The acoustics of suction Conference 7th Forum Acusticum, Krakow, 2014, (12pp). BibTeX @conference{rosser2014,
title = {The acoustics of suction},
author = {C. Rosser and A. Agarwal},
year = {2014},
date = {2014-01-01},
booktitle = {7th Forum Acusticum, Krakow},
pages = {1--12},
note = {12pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
2013
|
T. Newman,; A. Agarwal; A. P. Dowling A six sensor method for measuring acoustic properties in ducts Conference 21st International Congress on Acoustics, Montreal, 2013, (9pp). BibTeX @conference{Newman2013,
title = {A six sensor method for measuring acoustic properties in ducts},
author = {T. Newman, and A. Agarwal and A. P. Dowling},
year = {2013},
date = {2013-06-01},
booktitle = {21st International Congress on Acoustics, Montreal},
pages = {1--9},
note = {9pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
S. Sinayoko; A. Agarwal Instantaneous power spectral density and effect of blade
acceleration on trailing edge noise radiation from high speed rotor blades Conference 19th AIAA/CEAS Aeroacoustics Conference, Berlin, 2013, (16pp). BibTeX @conference{Sinayoko2013b,
title = {Instantaneous power spectral density and effect of blade
acceleration on trailing edge noise radiation from high speed rotor blades},
author = {S. Sinayoko and A. Agarwal},
year = {2013},
date = {2013-06-01},
booktitle = {19th AIAA/CEAS Aeroacoustics Conference, Berlin},
pages = {1--16},
note = {16pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
A. Cavalieri; A. Agarwal The effect of base-flow changes in Kelvin-Ħelmholtz instability Conference 19th AIAA/CEAS Aeroacoustics Conference, Berlin, 2013, (16pp). BibTeX @conference{Cavalieri2013,
title = {The effect of base-flow changes in Kelvin-Ħelmholtz instability},
author = {A. Cavalieri and A. Agarwal},
year = {2013},
date = {2013-05-01},
booktitle = {19th AIAA/CEAS Aeroacoustics Conference, Berlin},
pages = {1--16},
note = {16pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
Y. Baqui; A. Agarwal; A. Cavalieri; S. Sinayoko Nonlinear and linear noise source mechanisms in subsonic jets Conference 19th AIAA/CEAS Aeroacoustics Conference, Berlin, 2013, (13pp). BibTeX @conference{Baqui2013,
title = {Nonlinear and linear noise source mechanisms in subsonic jets},
author = {Y. Baqui and A. Agarwal and A. Cavalieri and S. Sinayoko},
year = {2013},
date = {2013-05-01},
booktitle = {19th AIAA/CEAS Aeroacoustics Conference, Berlin},
pages = {1--13},
note = {13pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
A. Kierkegaard; G. Efraimsson; A. Agarwal Linear simulations of liners sandwiched with a metal foam Conference 19th AIAA/CEAS Aeroacoustics Conference, Berlin, 2013, (10pp). BibTeX @conference{Axel2013,
title = {Linear simulations of liners sandwiched with a metal foam},
author = {A. Kierkegaard and G. Efraimsson and A. Agarwal},
year = {2013},
date = {2013-05-01},
booktitle = {19th AIAA/CEAS Aeroacoustics Conference, Berlin},
pages = {1--10},
note = {10pp},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
|
R. H. Henrywood; A. Agarwal The Aeroacoustics of a Steam Kettle Journal Article Physics of Fluids, 25 (10), pp. 1–23, 2013, (24pp). BibTeX @article{Henrywood2013,
title = {The Aeroacoustics of a Steam Kettle},
author = {R. H. Henrywood and A. Agarwal},
year = {2013},
date = {2013-01-01},
journal = {Physics of Fluids},
volume = {25},
number = {10},
pages = {1--23},
note = {24pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Newman, T. J.; Agarwal, A.; Dowling, A. P.; Desvard, L.; Stimpson, R. A six sensor method for measuring acoustic properties in ducts Journal Article Proceedings of Meetings on Acoustics, 133 (3404), pp. 1–13, 2013, (13pp). BibTeX @article{Newman13,
title = {A six sensor method for measuring acoustic properties in ducts},
author = {Newman, T. J. and Agarwal, A. and Dowling, A. P. and Desvard, L. and Stimpson, R.},
year = {2013},
date = {2013-01-01},
journal = {Proceedings of Meetings on Acoustics},
volume = {133},
number = {3404},
pages = {1--13},
note = {13pp},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
