Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 164) Show all publications
Xianghai, Q., Lin, D., Xiaodong, J., Åbom, M. & Bodén, H. (2018). A combined design method for optimal acoustic treatment of annular aeroengine inlet based on cremer impedance. In: 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. Paper presented at 25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018, Hiroshima, Japan, 8 July 2018 through 12 July 2018 (pp. 1248-1255). International Institute of Acoustics and Vibration, IIAV, 2
Open this publication in new window or tab >>A combined design method for optimal acoustic treatment of annular aeroengine inlet based on cremer impedance
Show others...
2018 (English)In: 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling, International Institute of Acoustics and Vibration, IIAV , 2018, Vol. 2, p. 1248-1255Conference paper, Published paper (Refereed)
Abstract [en]

A combined design method of impedance of acoustic nacelle is developed based on the Cremer impedance. First, the Cremer method is further extended to provide the theoretical optimum impedance for infinite uniform annular ducts in the presence of a single azimuthal mode and plug flow. Then, with the Cremer impedance being the initial value, the searching optimization based on a finite element sound propagation model is conducted to determine the impedance for maximizing noise reduction under the conditions of nearly actual duct geometry and flow. A design case of impedance of a typical aeroengine inlet is used to evaluate the method. The TL contour against impedance indicates that the combined design can avoid the local solution and find successfully the globally optimum impedance, thereby leading to the maximum sound attenuation. Additionally, the Cremer impedance is quite close to the final optimum impedance in this case, thereby providing not only a good initial impedance but also a proper searching space for the search optimization. Therefore, the combined design method is of high efficiency and accuracy.

Place, publisher, year, edition, pages
International Institute of Acoustics and Vibration, IIAV, 2018
Keywords
Acoustic treatment, Cremer method, Optimization design, Optimum impedance
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-241872 (URN)2-s2.0-85058716055 (Scopus ID)9781510868458 (ISBN)
Conference
25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018, Hiroshima, Japan, 8 July 2018 through 12 July 2018
Note

QC 20190125

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
Rynell, A., Chevalier, M., Åbom, M. & Efraimsson, G. (2018). A numerical study of noise characteristics originating from a shrouded subsonic automotive fan. Applied Acoustics, 140, 110-121
Open this publication in new window or tab >>A numerical study of noise characteristics originating from a shrouded subsonic automotive fan
2018 (English)In: Applied Acoustics, ISSN 0003-682X, E-ISSN 1872-910X, Vol. 140, p. 110-121Article in journal (Refereed) Published
Abstract [en]

The characteristics of the noise radiated from a reduced automotive cooling module are numerically studied focusing on the interaction effects linked to the sound generation mechanisms and the acoustic scattering caused by the confined installation. The flow field is simulated by adopting the formulation of Improved Delayed Detached Eddy Simulation (IDDES), which is a numerical technique that enables large-scale structures to be resolved and the wall-bounded flow to be treated depending on the turbulent content within the boundary layer. By comparing the simulated fan performance to two sets of measurement data of a similar setup, the aerodynamic results obtained from IDDES are validated and conformed to the volumetric flow rate delivered for the pressure drop measured. The acoustic part of the study comprises evaluation of the sound source associated with the momentum distribution imposed on the surroundings at an interface slightly upstream of the fan. At the microphone positions upstream of the installation, the SPL falls within the SPL range measured and the acoustic power delivered by the fan conforms to the SWL obtained from the comparison method in the reverberation room. The system response function, estimated by subtracting the SWL for the free-field simulation from the SWL associated with the reduced automotive cooling module marks spectral humps at fixed frequencies, irrespectively of sound source. As such, the engineering approach to the spectral decomposition method earlier published, which enables the acoustical properties of the installation to be isolated from the source, is validated and found to hold.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Aeroacoustics, Fan noise, IDDES, Installation effects, Spectral decomposition
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-228690 (URN)10.1016/j.apacoust.2018.05.006 (DOI)000440121900012 ()2-s2.0-85047243465 (Scopus ID)
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-08-20Bibliographically approved
Pietroniro, A. G., Mihaescu, M., Åbom, M. & Knutsson, M. (2018). A Steady-State Based Investigation of Automotive Turbocharger Compressor Noise. Paper presented at SAE 10th International Styrian Noise, Vibration and Harshness Congress: The European Automotive Noise Conference, SNVH 2018, Congress GrazSparkassenplatz 1Graz, Austria, 20 June 2018 through 22 June 2018. SAE technical paper series, 2018-June(June)
Open this publication in new window or tab >>A Steady-State Based Investigation of Automotive Turbocharger Compressor Noise
2018 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 2018-June, no JuneArticle in journal (Refereed) Published
Abstract [en]

The challenging problem of noise generation and propagation in automotive turbocharging systems is of real interest from both scientific and practical points of view. Robust and fast steady-state fluid flow calculations, complemented by acoustic analogies can represent valuable tools to be used for a quick assessment of the problem during e.g. design phase, and a starting point for more in-depth future unsteady calculations. Thus, as a part of the initial phase of a long-term project, a steady-state Reynolds Averaged Navier-Stokes (RANS) flow analysis is carried out for a specific automotive turbocharger compressor geometry. Acoustic data are extracted by means of aeroacoustics models available within the framework of the STAR-CCM+ solver (i.e. Curle and Proudman acoustic analogies, respectively). This part of the work focuses on the discussion and comparison of the aeroacoustic models, and their suitability towards predicting flow and acoustics trends corresponding to the operating conditions investigated. However, given the unsteady nature of acoustics, the project will have to develop towards an investigation of the problem using more expensive, but more accurate, Large Eddy Simulation (LES) calculations. An entire compressor map with 80 operating conditions was simulated, yielding trends in the behaviour of the performance parameters for the analysed compressor. Detailed results calculated on the same compressor speed-line for one design and one off-design operating conditions are presented in terms of time-averaged pressure coefficient, Mach number, and acoustic power distributions. A total acoustic power map has been generated based on the outcome from the Curle and Proudman acoustic models, giving an indication of the noisiest operating conditions.

Place, publisher, year, edition, pages
SAE International, 2018
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-238199 (URN)10.4271/2018-01-1528 (DOI)2-s2.0-85050556716 (Scopus ID)
Conference
SAE 10th International Styrian Noise, Vibration and Harshness Congress: The European Automotive Noise Conference, SNVH 2018, Congress GrazSparkassenplatz 1Graz, Austria, 20 June 2018 through 22 June 2018
Note

QC 20181116

Available from: 2018-11-16 Created: 2018-11-16 Last updated: 2018-11-16Bibliographically approved
Lemne, J., Sack, S. & Åbom, M. (2018). Acoustics of micro-perforated orifice plates. In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Marriott Magnificent Mile DowntownChicago, United States, 26 August 2018 through 29 August 2018. Institute of Noise Control Engineering
Open this publication in new window or tab >>Acoustics of micro-perforated orifice plates
2018 (English)In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, Institute of Noise Control Engineering , 2018Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a study on the performance of micro-perforated plates (MMP) aimed for application in heating, ventilation and air-conditioning (HVAC) ducts. MPPs are perforated plates with holes or slits in the sub mm range and perforation ratios between 1-10%. When sound waves penetrate the perforation, friction at the hole surfaces leads to acoustic absorption. As MPPs exhibit high flow resistance together with a thin, stiff, and lightweight structure, they can be used to replace internal support structures in flow duct applications to make them acoustically dissipative with small or negligible leakage of flow across the MPP. Here a micro-perforated circular orifice plate is compared to a similar plate without perforation. The comparison is based on measured multi-port data for the plates including both the scattering as well as the flow generated sound.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2018
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-241862 (URN)2-s2.0-85059395649 (Scopus ID)
Conference
47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Marriott Magnificent Mile DowntownChicago, United States, 26 August 2018 through 29 August 2018
Note

QC 20190125

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
Åbom, M., Bolin, K. & Ulfvengren, P. (2018). Air traffic management and noise. In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Marriott Magnificent Mile DowntownChicago, United States, 26 August 2018 through 29 August 2018. Institute of Noise Control Engineering
Open this publication in new window or tab >>Air traffic management and noise
2018 (English)In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, Institute of Noise Control Engineering , 2018Conference paper, Published paper (Refereed)
Abstract [en]

With the steady increase of air traffic the need for developing sustainable aviation increases as well. To meet this need, the Swedish Transport Administration and KTH Royal Institute of Technology have established a Centre for Sustainable Aviation. In a global perspective, aviation research focuses on meeting future capacity needs for increased travel and at the same time achieve sustainability with reduced environmental impact and sustained or increased safety. This paper describes four on-going projects, as examples of the variety of research that may contribute to a sustainable society in both shorter and longer terms as well as both in a local and in an international perspective. Initially the centre will apply and direct existing knowledge towards noise abatement initiatives in aviation. I the long-term perspective the research will contribute to knowledge on a broader spectrum of sustainability aspects of aviation.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2018
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-241886 (URN)2-s2.0-85059402429 (Scopus ID)
Conference
47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Marriott Magnificent Mile DowntownChicago, United States, 26 August 2018 through 29 August 2018
Note

QC 20190125

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
Zhang, Z., Tiikoja, H., Åbom, M. & Bodén, H. (2018). Experimental analysis of whistle noise in a particle agglomeration pipe. In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Marriott Magnificent Mile DowntownChicago, United States, 26 August 2018 through 29 August 2018. Institute of Noise Control Engineering
Open this publication in new window or tab >>Experimental analysis of whistle noise in a particle agglomeration pipe
2018 (English)In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, Institute of Noise Control Engineering , 2018Conference paper, Published paper (Refereed)
Abstract [en]

A self-sustained sound, more usually known as a whistle, refers to a distinct tonal noise created due to the interaction between the sound and flow field. When a positive feedback loop is formed between the two fields, the energy in the mean flow will be transferred into the sound wave, thus giving rise to a whistle. In engineering practice, whistles are destructive as they can produce high sound and vibration levels and may result in risk for mechanical failures. In this work, a flow-related high level tonal noise was found during a measurement on a particle agglomeration pipe, which is a quasi-periodic corrugated structure designed for the exhaust system of heavy-duty trucks. The purpose of the pipe is to enhance particle agglomeration to increase the size of exhaust gas particles. To investigate the origin of the detected tonal noise additional measurements were carried out. Based on the measurement result, the aero-acoustic coupling in the agglomeration pipe was analyzed, revealing that the pipe has a large potentiality to amplify the incident sound power in the presence of a mean flow. Furthermore, the Nyquist stability criterion was applied to confirm the existence of exponentially growing modes in the system at certain conditions.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2018
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-241859 (URN)2-s2.0-85059372519 (Scopus ID)
Conference
47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Marriott Magnificent Mile DowntownChicago, United States, 26 August 2018 through 29 August 2018
Note

QC 20190122

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved
Zhang, Z., Tiikoja, H., Åbom, M. & Bodén, H. (2018). EXPERIMENTAL ANALYSIS OF WHISTLE NOISE IN A PARTICLE AGGLOMERATION PIPE. In: PROCEEDINGS OF INTERNOISE/ASME NCAD - NOISE CONTROL AND ACOUSTICS DIVISION CONFERENCE, 2018: . Paper presented at InterNoise/ASME Noise Control and Acoustics Division Conference (NCAD 2018). ASME Press, Article ID UNSP V001T06A002.
Open this publication in new window or tab >>EXPERIMENTAL ANALYSIS OF WHISTLE NOISE IN A PARTICLE AGGLOMERATION PIPE
2018 (English)In: PROCEEDINGS OF INTERNOISE/ASME NCAD - NOISE CONTROL AND ACOUSTICS DIVISION CONFERENCE, 2018, ASME Press, 2018, article id UNSP V001T06A002Conference paper, Published paper (Refereed)
Abstract [en]

A self-sustained sound, more usually known as a whistle, refers to a distinct tonal noise created due to the interaction between the sound and flow field. When a positive feedback loop is formed between the two fields, the energy in the mean flow will be transferred into the sound wave, thus giving rise to a whistle. In engineering practice, whistles are destructive as they can produce high sound and vibration levels and may result in risk for mechanical failures. In this work, a flow-related high level tonal noise was found during a measurement on a particle agglomeration pipe, which is a quasi-periodic corrugated structure designed for the exhaust system of heavy-duty trucks. The purpose of the pipe is to enhance particle agglomeration to increase the size of exhaust gas particles. To investigate the origin of the detected tonal noise additional measurements were carried out. Based on the measurement result, the aero-acoustic coupling in the agglomeration pipe was analyzed, revealing that the pipe has a large potentiality to amplify the incident sound power in the presence of a mean flow. Furthermore, the Nyquist stability criterion was applied to confirm the existence of exponentially growing modes in the system at certain conditions.

Place, publisher, year, edition, pages
ASME Press, 2018
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-243980 (URN)000456356800019 ()2-s2.0-85059372519 (Scopus ID)978-0-7918-5142-5 (ISBN)
Conference
InterNoise/ASME Noise Control and Acoustics Division Conference (NCAD 2018)
Note

QC 20190221

Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-02-21Bibliographically approved
Zhang, Z., Tiikoja, H., Peerlings, L. & Åbom, M. (2018). Experimental Analysis on the 'Exact' Cremer Impedance in Rectangular Ducts. Paper presented at SAE 10th International Styrian Noise, Vibration and Harshness Congress: The European Automotive Noise Conference, SNVH 2018, Congress GrazSparkassenplatz 1Graz, Austria, 20 June 2018 through 22 June 2018. SAE technical paper series, 2018-June(June)
Open this publication in new window or tab >>Experimental Analysis on the 'Exact' Cremer Impedance in Rectangular Ducts
2018 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 2018-June, no JuneArticle in journal (Refereed) Published
Abstract [en]

Cremer impedance, first proposed by Cremer (Acustica 3, 1953) and then improved by Tester (JSV 28, 1973), refers to the locally reacting boundary condition that can maximize the attenuation of a certain acoustic mode in a uniform waveguide. One limitation in Tester's work is that it simplified the analysis on the effect of flow by only considering high frequencies or the 'well cut-on' modes. This approximation is reasonable for large duct applications, e.g., aero-engines, but not for many other cases of interest, with the vehicle intake and exhaust system included. A recent modification done by Kabral et al. (Acta Acustica united with Acustica 102, 2016) has removed this limitation and investigated the 'exact' solution of Cremer impedance for circular waveguides, which reveals an appreciable difference between the exact and classic solution in the low frequency range. Consequently, the exact solution can lead to a much higher low-frequency attenuation level. In addition, the exact solution is found to exhibit some special properties at very low frequencies, e.g., a negative resistance. In this paper, liners designed on the basis of the exact solution are tested and the difference between the exact and classic solution in the low frequency range (not low enough to go into the negative resistance region) is experimentally investigated.

Place, publisher, year, edition, pages
SAE International, 2018
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-238194 (URN)10.4271/2018-01-1523 (DOI)2-s2.0-85050564046 (Scopus ID)
Conference
SAE 10th International Styrian Noise, Vibration and Harshness Congress: The European Automotive Noise Conference, SNVH 2018, Congress GrazSparkassenplatz 1Graz, Austria, 20 June 2018 through 22 June 2018
Note

QC 20181120

Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2018-11-20Bibliographically approved
Vizzini, S., Knutsson, M., Dybeck, M. & Åbom, M. (2018). Flow Noise Generation in a Pipe Bend. Paper presented at SAE 10th International Styrian Noise, Vibration and Harshness Congress: The European Automotive Noise Conference, SNVH 2018, Congress Graz Sparkassenplatz 1Graz, Austria, 20 June 2018 through 22 June 2018. SAE technical paper series, 2018-June(June)
Open this publication in new window or tab >>Flow Noise Generation in a Pipe Bend
2018 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 2018-June, no JuneArticle in journal (Refereed) Published
Abstract [en]

Noise generated by low Mach number flow in duct networks is important in many industrial applications. In the automotive industry the two most important are the ventilation duct network and the engine exhaust system. Traditionally, design is made based on rule-of thumb or slightly better by simple semi-empirical scaling laws for flow noise. In many cases, strong curvatures and local deviations from circular cross-sections are created due to outer geometry restrictions. This can result in local relatively high flow velocities and complex flow separation patterns and as a result, rule-of thumb and scaling law methods can become highly inaccurate and uncertain. More advanced techniques based on time domain modelling of the fluid dynamics equations together with acoustic analogies can offer a better understanding of the local noise generation, the propagation and interaction with the rest of the system. This investigation focuses on validating an SNGR numerical model to predict flow noise generation due to separation in a circular duct with a 90-degree bend carrying a flow lower than 0.3 Mach number. Experimental results are presented and compared to numerical simulations, based on a combination of steady computational fluid dynamics and the stochastic acoustic analogy by Lighthill, as well as semi-empirical models based two-ports.

Place, publisher, year, edition, pages
SAE International, 2018
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-233711 (URN)10.4271/2018-01-1525 (DOI)2-s2.0-85050533001 (Scopus ID)
Conference
SAE 10th International Styrian Noise, Vibration and Harshness Congress: The European Automotive Noise Conference, SNVH 2018, Congress Graz Sparkassenplatz 1Graz, Austria, 20 June 2018 through 22 June 2018
Note

QC 20180831

Available from: 2018-08-31 Created: 2018-08-31 Last updated: 2018-08-31Bibliographically approved
Kabral, R. & Åbom, M. (2018). Investigation of turbocharger compressor surge inception by means of an acoustic two-port model. Journal of Sound and Vibration, 412, 270-286
Open this publication in new window or tab >>Investigation of turbocharger compressor surge inception by means of an acoustic two-port model
2018 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 412, p. 270-286Article in journal (Refereed) Published
Abstract [en]

The use of centrifugal compressors have increased tremendously in the last decade being implemented in the modern IC engine design as a key component. However, an efficient implementation is restricted by the compression system surge phenomenon. The focus in the investigation of surge inception have mainly been on the aerodynamic field while neglecting the acoustic field. In the present work a new method based on the full acoustic 2-port model is proposed for investigation of centrifugal compressor stall and surge inception. Essentially, the compressor is acoustically decoupled from the compression system, hence enabling the determination of sound generation and the quantification of internal aero-acoustic coupling effects, both independently of the connected pipe system. These frequency dependent quantities are indicating if the compressor is prone to self-sustained oscillations in case of positive feedback when installed in a system. The method is demonstrated on experimentally determined 2-port data of an automotive turbocharger centrifugal compressor under a variety of realistic operating conditions.

Place, publisher, year, edition, pages
Academic Press, 2018
Keywords
Centrifugal compressor acoustics, Surge inception, Stall, Sound generation, Noise, Full 2-port
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-219483 (URN)10.1016/j.jsv.2017.10.003 (DOI)000416040400016 ()2-s2.0-85034217168 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 289352
Note

QC 20171207

Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2017-12-07Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7898-8643

Search in DiVA

Show all publications