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Shah, S., Bodén, H. & Boij, S. (2023). An experimental study on three-port measurements for acoustic characterisation of the perforate resistance. Journal of Sound and Vibration, 556, Article ID 117686.
Open this publication in new window or tab >>An experimental study on three-port measurements for acoustic characterisation of the perforate resistance
2023 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 556, article id 117686Article in journal (Refereed) Published
Abstract [en]

Perforated plates are frequently applied in passive noise-control systems in e.g. aircraft liners and mufflers. Many of the applications of a perforated plate involve an exposure to grazing flow and high-amplitude acoustic incidence. The ongoing scientific effort of providing experimental results using multiform test setups is continued in this study. Incorporating the three-port technique, the passive acoustic response of a perforated plate is studied under acoustic excitation from three directions in presence of grazing flow and high-amplitude acoustic excitation. The applied three-port technique has an advantage of being a direct method for impedance determination and is not bound by any boundary conditions traditionally considered in presence of grazing flow. In this study, a semi-empirical model for the normalised resistance of a perforate is presented. The model takes the Mach, Strouhal, and Shear numbers into account. Additionally, for low grazing flow speeds, the non-linear effects of resistance are found to be dependent on the grazing flow speed.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Perforate, Three-port technique, Resistance, Grazing flow, Non-linear effects
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-327428 (URN)10.1016/j.jsv.2023.117686 (DOI)000984114700001 ()2-s2.0-85152616047 (Scopus ID)
Note

QC 20230530

Available from: 2023-05-30 Created: 2023-05-30 Last updated: 2023-11-24Bibliographically approved
Bodén, H., Boij, S. & Shah, S. (2023). An investigation of perforate reactance under high level and grazing flow excitation. In: Proceedings of the 29th International Congress on Sound and Vibration, ICSV 2023: . Paper presented at 29th International Congress on Sound and Vibration, ICSV 2023, Prague, Czechia, Jul 9 2023 - Jul 13 2023. Society of Acoustics
Open this publication in new window or tab >>An investigation of perforate reactance under high level and grazing flow excitation
2023 (English)In: Proceedings of the 29th International Congress on Sound and Vibration, ICSV 2023, Society of Acoustics , 2023Conference paper, Published paper (Refereed)
Abstract [en]

Perforates are frequently used as part of sound reducing treatment in for instance aircraft engine and IC engine applications. In these applications they are exposed to fluid flow and high-level acoustic excitation, and this influences the acoustic properties of the perforate, as is well known from many published papers. The acoustic properties are usually described using a transfer impedance. In a previous part of this study the effect on the real part (resistance) of the transfer impedance was studied using both a conventional impedance tube (two-port) setup and an innovative three-port setup. The three-port configuration made it possible to study both the effect of grazing flow and high-level excitation effects separately as well as jointly. The present paper is a follow-up study where the imaginary part (reactance) of the transfer impedance is the focus. Comparisons are made with results from previously published papers and empirical models.

Place, publisher, year, edition, pages
Society of Acoustics, 2023
Keywords
aeroacoustics, effects of flow, nonlinear effects, perforates
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-337850 (URN)2-s2.0-85170644510 (Scopus ID)
Conference
29th International Congress on Sound and Vibration, ICSV 2023, Prague, Czechia, Jul 9 2023 - Jul 13 2023
Note

Part of ISBN 9788011034238

QC 20231010

Available from: 2023-10-10 Created: 2023-10-10 Last updated: 2023-10-10Bibliographically approved
Laudato, M., Mihaescu, M., Zea, E. & Boij, S. (2023). Computational aeroacoustics in flexible conduits with application to biomedical fluid dynamics. In: 184th Meeting of the Acoustical Society of America: . Paper presented at Journal of the Acoustical Society of America (pp. A194). Chicago, USA: Acoustical Society of America (ASA), 153
Open this publication in new window or tab >>Computational aeroacoustics in flexible conduits with application to biomedical fluid dynamics
2023 (English)In: 184th Meeting of the Acoustical Society of America, Chicago, USA: Acoustical Society of America (ASA) , 2023, Vol. 153, p. A194-Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Flexible tubes are simple yet powerful tools for the modeling of respiratory and circulatory systems [1, 2]. In the last decade, access to high-performance computational resources has allowed the implementation of realistic numerical models of human vessels based on Computational Fluid Dynamics (CFD) and Fluid-Structure Interaction (FSI) simulations. Interestingly, the recently proven correlation [3] between CFD observables (like the pharyngeal airway's resistance) and clinical data (such as the Apnoea Hypopnea Index in Obstructive Sleep Apnoea patients) suggests a possible development of diagnostic methods based on numerical simulations. This work aims to investigate the extension of these correlations to the aeroacoustics characteristics of flexible conduits by means of a fully coupled FSI numerical model based on the Large Eddy Simulation method. These results have relevant applications to studying diseases of the human upper vocal tract, voice production, obstructive sleep apnoea, and adventitious lung sounds, such as wheezing and crackling.

[1] Grotberg, J. B., & Jensen, O. E. (2004). Annu. Rev. Fluid Mech., 36, 121–147.

[2] Schwartz, A. R., & Smith, P. L. (2013). The Journal of Physiology, 591(Pt 9), 2229.

[3] Schickhofer L., Malinen J., Mihaescu M., J. Acoust. Soc. Am. - JASA, 145 (4): 2049–2061, 2019. https://doi.org/10.1121/1.5095250

Place, publisher, year, edition, pages
Chicago, USA: Acoustical Society of America (ASA), 2023
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics; Biological Physics
Identifiers
urn:nbn:se:kth:diva-326362 (URN)10.1121/10.0018632 (DOI)001000287901183 ()
Conference
Journal of the Acoustical Society of America
Note

QC 20230516

Available from: 2023-04-30 Created: 2023-04-30 Last updated: 2023-09-01Bibliographically approved
Vaddamani, C., Boij, S., Bodén, H. & Karlsson, M. (2023). Influence of pitch ratio on the acoustic properties of tube banks. In: Proceedings of the 29th International Congress on Sound and Vibration, ICSV 2023: . Paper presented at 29th International Congress on Sound and Vibration, ICSV 2023, Prague, Czechia, Jul 9 2023 - Jul 13 2023. Society of Acoustics
Open this publication in new window or tab >>Influence of pitch ratio on the acoustic properties of tube banks
2023 (English)In: Proceedings of the 29th International Congress on Sound and Vibration, ICSV 2023, Society of Acoustics , 2023Conference paper, Published paper (Refereed)
Abstract [en]

In boilers and heat exchangers devices, tube banks are used to transfer heat. One of the commonly used arrangement in heat exchangers are staggered tube banks, which consists of tubes arranged in triangular array form. The tube banks are characterized by their longitudinal and transverse pitch ratios, which is the pitch-to- diameter ratio. Based on the pitch ratio the tube bank is considered either a compact or a widely spaced tube bank arrangement. The tube bank may cause acoustic instabilities in the system. In this study, an investigation was performed to analyse the aero-acoustic properties of tube bank samples. Experiments were conducted for three staggered tube bank samples with pitch ratio varying from 1.2 (compact arrangement) to 2 (widely spaced arrangement). Passive properties determine the sound propagation through the system, while the active acoustic properties describe the acoustic source in the system. The attention is in this paper on the passive acoustic properties of staggered tube banks. The experimental results consist of scattering coefficients for samples with different pitch ratios and power balance for all three samples which are compared to see the pitch ratio effect on the acoustic properties.

Place, publisher, year, edition, pages
Society of Acoustics, 2023
Keywords
Acoustic instabilities, Passive acoustic properties, Pitch ratio, Staggered tube bank
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-337851 (URN)2-s2.0-85170647403 (Scopus ID)
Conference
29th International Congress on Sound and Vibration, ICSV 2023, Prague, Czechia, Jul 9 2023 - Jul 13 2023
Note

Part of ISBN 9788011034238

QC 20231010

Available from: 2023-10-10 Created: 2023-10-10 Last updated: 2023-11-28Bibliographically approved
Shah, S., Bodén, H. & Boij, S. (2023). On the sensitivity analysis of three-port measurements for acoustic characterisation of perforates. In: Proceedings of the 29th International Congress on Sound and Vibration, ICSV 2023: . Paper presented at 29th International Congress on Sound and Vibration, ICSV 2023, Prague, Czechia, Jul 9 2023 - Jul 13 2023. Society of Acoustics
Open this publication in new window or tab >>On the sensitivity analysis of three-port measurements for acoustic characterisation of perforates
2023 (English)In: Proceedings of the 29th International Congress on Sound and Vibration, ICSV 2023, Society of Acoustics , 2023Conference paper, Published paper (Refereed)
Abstract [en]

Perforates, often with a backing cavity, are used in noise reducing liners and silencers for aircraft engines and internal combustion engines. Direct methods of impedance estimation can be used for the acoustic characterisation of the perforated plates standalone, without the backing cavity, in presence of grazing flow. The three-port technique is a direct method for estimating the transfer impedance of perforates in presence of grazing flow and high-amplitude acoustic excitation. In a previous study, the dependence of the experimentally determined transfer impedance on the operating conditions, namely the in-duct temperature, the grazing flow speed and microphone distances is shown. This paper is a follow up to the previous study and attempts to quantify the effect of variations in these testing conditions on the real part of the transfer impedance, i.e., the resistance. The possible sources of errors and deviations in the determination of the operating conditions are discussed. Based on the uncertainty range of the operating conditions, a Monte-Carlo simulation is performed to calculate the confidence intervals of the results. Additionally, the effect of the error distribution on the confidence intervals is displayed.

Place, publisher, year, edition, pages
Society of Acoustics, 2023
Keywords
error analysis, grazing flow, impedance, Monte-Carlo analysis, perforates
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-337849 (URN)2-s2.0-85170648533 (Scopus ID)
Conference
29th International Congress on Sound and Vibration, ICSV 2023, Prague, Czechia, Jul 9 2023 - Jul 13 2023
Note

Part of ISBN 9788011034238

QC 20231010

Available from: 2023-10-10 Created: 2023-10-10 Last updated: 2023-10-10Bibliographically approved
Nygren, J., Boij, S., Rumpler, R. & O'Reilly, C. J. (2023). Vehicle-specific noise exposure cost: Noise impact allocation methodology for microscopic traffic simulations. Transportation Research Part D: Transport and Environment, 118, 103712-103712, Article ID 103712.
Open this publication in new window or tab >>Vehicle-specific noise exposure cost: Noise impact allocation methodology for microscopic traffic simulations
2023 (English)In: Transportation Research Part D: Transport and Environment, ISSN 1361-9209, E-ISSN 1879-2340, Vol. 118, p. 103712-103712, article id 103712Article in journal (Refereed) Published
Abstract [en]

This paper proposes a methodology in traffic noise assessment, whose objective is to combine microscopic traffic simulations and noise calculation methods with macro-level, systemic noise impact assessment models. This combination, referred to as the vehicle-specific noise exposure cost (NEC), provides a per-vehicle contribution to the overall noise impact. Three case studies are introduced illustrating the potential of the methodology: a reference case with a dynamic traffic flow, the correlation between vehicle-specific NECs and average speeds, and vehicle-specific NECs in a mixed traffic fleet. The results highlight the interest and importance of using a microscopic approach, as the impact of interactions, vehicle-specific characteristics and behaviors are reflected into the associated NECs. Additionally, the correlation between vehicle-specific NECs and average speeds strongly depends on traffic conditions, further highlighting the importance of methodological features such as the interactions captured in microscopic traffic simulations or the acceleration-dependency of the implemented vehicle noise source model.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Microscopic traffic simulationsRoad traffic noiseNoise exposureNoise impact assessment
National Category
Vehicle Engineering Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-325017 (URN)10.1016/j.trd.2023.103712 (DOI)001035838400001 ()2-s2.0-85150767054 (Scopus ID)
Note

QC 20231122

Available from: 2023-03-24 Created: 2023-03-24 Last updated: 2023-12-14Bibliographically approved
Surendran, A., Na, W., Boakes, C., Yang, D., Morgans, A. & Boij, S. (2022). A low frequency model for the aeroacoustic scattering of cylindrical tube rows in cross-flow. Journal of Sound and Vibration, 527, 116806, Article ID 116806.
Open this publication in new window or tab >>A low frequency model for the aeroacoustic scattering of cylindrical tube rows in cross-flow
Show others...
2022 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 527, p. 116806-, article id 116806Article in journal (Refereed) Published
Abstract [en]

Heat exchanger tube rows can influence the thermoacoustic instability behaviour of combustion systems since they act as both acoustic scatterers and unsteady heat sinks. Therefore, with careful tuning of their thermoacoustic properties, heat exchangers have the potential to act as passive control devices. In this work, we focus on (only) the acoustic scattering behaviour of heat exchanger tubes. We present a comparison of existing acoustic models for tube rows and slits, models for the latter having the advantage of incorporating frequency dependence. We then propose a new model that enables the adaptation of slit models for tube rows. This model is validated against experiments and Linearised Navier-Stokes Equations (LNSE) predictions for the transmission and reflection coefficients, including phase information. The model predictions show very good agreement with the experimental and numerical validations, especially for low frequencies (Strouhal number < 0.5, based on tube radius and excitation frequency), with mean differences less than 2% for the transmission coefficients (the reflection coefficient errors are somewhat larger since their magnitudes are very close to zero).

Place, publisher, year, edition, pages
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2022
Keywords
Cummings-Fant equation, Acoustic scattering, Aeroacoustic models, Tube rows, Rectangular slits
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-313514 (URN)10.1016/j.jsv.2022.116806 (DOI)000797026800005 ()2-s2.0-85125255105 (Scopus ID)
Note

QC 20220607

Available from: 2022-06-07 Created: 2022-06-07 Last updated: 2022-06-25Bibliographically approved
Na, W., Yang, D., Surendran, A., Boij, S., Morgans, A. & Yao, H. (2022). A slug length calculation for a contraction with mean flow between two half cylinders. In: Internoise 2022: 51st International Congress and Exposition on Noise Control Engineering. Paper presented at 51st International Congress and Exposition on Noise Control Engineering, Internoise 2022, Glasgow, United Kingdom of Great Britain and Northern Ireland, Aug 21 2022 - Aug 24 2022. The Institute of Noise Control Engineering of the USA, Inc.
Open this publication in new window or tab >>A slug length calculation for a contraction with mean flow between two half cylinders
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2022 (English)In: Internoise 2022: 51st International Congress and Exposition on Noise Control Engineering, The Institute of Noise Control Engineering of the USA, Inc. , 2022Conference paper, Published paper (Refereed)
Abstract [en]

A slug length is widely used to describe additional mass inertia at low frequencies in duct acoustics. It is often used in acoustic energy analysis, e.g. as one of the inputs for semi-analytical or empirical models to obtain the acoustic reflection and transmission coefficients. However, the calculation of slug length is usually empirical and limited to certain conditions, such as simple geometric configurations, low frequencies, no mean flow, etc. In this paper, the slug length at a contraction with mean flow between two half cylinders is calculated by different methods: solving the Laplace's equation numerically, solving the Helmholtz equation, and using the Cummings - Fant equation based on the numerical results of frequency-domain linearized Navier-Stokes equations. Both the frequency-dependance and the mean flow effect are discussed. The calculated slug length can also be used as a crucial input, for example, in the Dowling and Hughes slit model and modified Cummings slit model to predict the acoustic scattering at tube rows in the presence of a cross mean flow[7].

Place, publisher, year, edition, pages
The Institute of Noise Control Engineering of the USA, Inc., 2022
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-333423 (URN)2-s2.0-85147450820 (Scopus ID)
Conference
51st International Congress and Exposition on Noise Control Engineering, Internoise 2022, Glasgow, United Kingdom of Great Britain and Northern Ireland, Aug 21 2022 - Aug 24 2022
Note

Part of ISBN 9781906913427

QC 20230801

Available from: 2023-08-01 Created: 2023-08-01 Last updated: 2023-08-01Bibliographically approved
Surendran, A., Na, W., Boakes, C., Yang, D., Morgans, A. S. & Boij, S. (2022). Adapting a slit model to determine the aeroacoustic response of tube rows. In: Internoise 2022: 51st International Congress and Exposition on Noise Control Engineering. Paper presented at 51st International Congress and Exposition on Noise Control Engineering, Internoise 2022, Glasgow, United Kingdom of Great Britain and Northern Ireland, Aug 21 2022 - Aug 24 2022. The Institute of Noise Control Engineering of the USA, Inc.
Open this publication in new window or tab >>Adapting a slit model to determine the aeroacoustic response of tube rows
Show others...
2022 (English)In: Internoise 2022: 51st International Congress and Exposition on Noise Control Engineering, The Institute of Noise Control Engineering of the USA, Inc. , 2022Conference paper, Published paper (Refereed)
Abstract [en]

Cylindrical tubes in cross-flow, like the ones found in heat exchangers, are excellent acoustic dampers and as such have the potential to mitigate thermoacoustic instabilities. Flow separation and vortex shedding downstream of the tube row are key to significantly enhancing sound attenuation. However, constructing an analytical solution for the aeroacoustic response of tube rows in cross-flow is very challenging owing to the complex flow structure, vortex shedding and coupling with acoustics. To overcome this, we propose the adaptation of a slit model for tube row acoustic scattering (aeroacoustic response) predictions at low Strouhal numbers. The slit model was modified such that the loss coefficients across the slit and the tube row matches. The model is then validated against numerical predictions using Linearised Navier Stokes Equations and experimental measurements. The predictions for both magnitude and phase for transmission and reflection coefficients agree well with the simulations and experiments.

Place, publisher, year, edition, pages
The Institute of Noise Control Engineering of the USA, Inc., 2022
National Category
Fluid Mechanics and Acoustics Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-333416 (URN)2-s2.0-85147451409 (Scopus ID)
Conference
51st International Congress and Exposition on Noise Control Engineering, Internoise 2022, Glasgow, United Kingdom of Great Britain and Northern Ireland, Aug 21 2022 - Aug 24 2022
Note

Part of ISBN 9781906913427

QC 20230801

Available from: 2023-08-01 Created: 2023-08-01 Last updated: 2023-08-01Bibliographically approved
Vaddamani, C., Boij, S., Bodén, H. & Karlsson, M. (2022). Effect of Pitch Ratio of Tube Banks on Passive Acoustic Properties. In: Internoise 2022: 51st International Congress and Exposition on Noise Control Engineering. Paper presented at 51st International Congress and Exposition on Noise Control Engineering, Internoise 2022, Glasgow, United Kingdom of Great Britain and Northern Ireland, Aug 21 2022 - Aug 24 2022. The Institute of Noise Control Engineering of the USA, Inc.
Open this publication in new window or tab >>Effect of Pitch Ratio of Tube Banks on Passive Acoustic Properties
2022 (English)In: Internoise 2022: 51st International Congress and Exposition on Noise Control Engineering, The Institute of Noise Control Engineering of the USA, Inc. , 2022Conference paper, Published paper (Refereed)
Abstract [en]

Tube banks are common design elements in heat exchangers. The most common tube bank patterns are in-line tube banks which consists of tubes spaced parallel and equally. Tube banks are characterized by their longitudinal and transverse pitch ratios (pitch to diameter). The tube bank with a pitch ratio of less than 1.25 is considered a compact tube bank and a pitch ratio equal to or greater than 2 is considered as widely spaced. In this paper, the attention is focused on the effects of pitch ratio in tube banks on its passive acoustics properties which are experimentally investigated. The flow duct experimentation is performed with flow to analyse the passive acoustic properties of tube banks. The experiment is conducted for three In-line tube banks with pitch ratios 1.2,1.4 and 2. The Experimental results consist of scattering matrix coefficients and power balance. The results are compared to see the pitch ratio effect. Transmission and reflection coefficients were found to increase with frequency for higher flow speeds and shows more waviness for compact tube bank. The power balance is calculated to see the amplification and attenuation effects of the tube bank. It is observed that compact tube banks give amplification for higher frequencies and wide spaced tube bank give moderate attenuation for all frequencies.

Place, publisher, year, edition, pages
The Institute of Noise Control Engineering of the USA, Inc., 2022
Keywords
In-line arrangement, Passive Acoustic properties, Pitch Ratio, Tube Banks
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-333414 (URN)2-s2.0-85147457158 (Scopus ID)
Conference
51st International Congress and Exposition on Noise Control Engineering, Internoise 2022, Glasgow, United Kingdom of Great Britain and Northern Ireland, Aug 21 2022 - Aug 24 2022
Note

Part of ISBN 9781906913427

QC 20230801

Available from: 2023-08-01 Created: 2023-08-01 Last updated: 2023-11-28Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-4103-0129

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