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Manzari, L., Göransson, P., Cuenca, J. & Lopez Arteaga, I. (2018). A fully automated high-speed optical rig for in vacuo, full field, non-contact vibration measurements for viscoelastic, anisotropic materials. In: : . Paper presented at NOVEM 2018 Noise and vibration emerging methods, The 6th conference, Ibiza (Balearic Islands), Spain, May 7-9, 2018 (pp. 91-102). , Article ID 175109.
Open this publication in new window or tab >>A fully automated high-speed optical rig for in vacuo, full field, non-contact vibration measurements for viscoelastic, anisotropic materials
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, a setup for measuring the three-dimensional displacement field of a test object un-dergoing controlled dynamic excitation in a vacuum chamber is presented. The setup has beendesigned with porous materials in mind, yet is suitable for the measurement of anisotropic vis-coelastic solids in general. To achieve non-contact data acquisition, a stereo high-speed camerasystem measures the displacement of the foundation and of the test object. A laser Doppler vi-brometer is used before the actual measurement to choose an excitation level that maximizes thesignal-to-noise ratio while allowing to ensure that the test object is fully relaxed and stable at thebeginning of every measurement. The setup, comprising both commercial and in-house hardwareand software solutions, addresses the challenges of measuring in vacuum with non-contact tech-niques. All these aspects are discussed in the current paper, and preliminary results are presented.The ultimate objective is to estimate the dynamic properties of a material using inverse methodsand the data obtained.

Keywords
dic, non-contact, vibration, anisotropy, high-speed, digital image correlation, viscoelasticity
National Category
Mechanical Engineering
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-231576 (URN)
Conference
NOVEM 2018 Noise and vibration emerging methods, The 6th conference, Ibiza (Balearic Islands), Spain, May 7-9, 2018
Note

QC 20180702

Available from: 2018-06-29 Created: 2018-06-29 Last updated: 2018-10-19Bibliographically approved
Thompson, D., Squicciarini, G., Zhang, J., Lopez Arteaga, I., Zea, E., Dittrich, M., . . . Wändell, J. (2018). Assessment of measurement-based methods for separating wheel and track contributions to railway rolling noise. Applied Acoustics, 140, 48-62
Open this publication in new window or tab >>Assessment of measurement-based methods for separating wheel and track contributions to railway rolling noise
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2018 (English)In: Applied Acoustics, ISSN 0003-682x, Vol. 140, p. 48-62Article in journal (Refereed) Published
Abstract [en]

The noise produced during a train pass-by originates from several different sources such as propulsion noise, noise from auxiliary equipment, aerodynamic noise and rolling noise. The rolling noise is radiated by the wheels and the track and is excited by the wheel and rail unevenness, usually referred to as roughness. The current TSI Noise certification method, which must be satisfied by all new mainline trains in Europe, relies on the use of a reference track to quantify the noise from new vehicles. The reference track is defined by an upper limit of the rail roughness and a lower limit of the track decay rate (TDR). However, since neither the rail roughness nor the track radiation can be completely neglected, the result cannot be taken as representing only the vehicle noise and the measurement does not allow separate identification of the noise radiated by wheel and track. It is even likely that further reductions in the limit values for new rolling stock cannot be achieved on current tracks. There is therefore a need for a method to separate the noise into these two components reliably and cheaply. The purpose of the current study is to assess existing and new methods for rolling noise separation. Field tests have been carried out under controlled conditions, allowing the different methods to be compared. The TWINS model is used with measured vibration data to give reference estimates of the wheel and track noise components. Six different methods are then considered that can be used to estimate the track component. It is found that most of these methods can obtain the track component of noise with acceptable accuracy. However, apart from the TWINS model, the wheel noise component could only be estimated directly using three methods and un- fortunately these did not give satisfactory results in the current tests.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Railway noise, Rolling noise, Experimental methods, Source separation, Transfer path analysis, Beamforming
National Category
Fluid Mechanics and Acoustics Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-228062 (URN)10.1016/j.apacoust.2018.05.012 (DOI)000440121900006 ()2-s2.0-85047198783 (Scopus ID)
Projects
Roll2Rail
Funder
EU, Horizon 2020, 636032
Note

QC 20180525

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-08-20Bibliographically approved
Hosseini, N., Kornilov, V. N., Teerling, O. J., Lopez Arteaga, I. & de Goey, P. (2018). Evaluating thermoacoustic properties of heating appliances considering the burner and heat exchanger as acoustically active elements. Combustion and Flame, 191, 486-495
Open this publication in new window or tab >>Evaluating thermoacoustic properties of heating appliances considering the burner and heat exchanger as acoustically active elements
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2018 (English)In: Combustion and Flame, ISSN 0010-2180, E-ISSN 1556-2921, Vol. 191, p. 486-495Article in journal (Refereed) Published
Abstract [en]

Heat exchangers are an essential constituent part of many combustion systems. The thermoacoustic instability in such systems is a common problem and it has been studied extensively. However, the heat exchanger has not gained much attention in the field of combustion thermoacoustics, leading to a lack of knowledge about the thermoacoustic interactions between the burner and the heat exchanger. In this paper, a modeling approach is introduced to study these interactions in an academic representation of a heating appliance, comprised of a perforated slit burner and a tube heat exchanger. Both elements are considered thermally and acoustically active. A CFD model is used in a two-dimensional domain to simulate the response of the system to small amplitude broadband velocity perturbations. The thermochemical and acoustic coupling between the burner and the heat exchanger is investigated and a method is introduced to decouple their effects and study them separately. The extents to which this method is valid are addressed by varying the distance between the elements. Results show that as long as the flames do not impinge on the heat exchanger surface, a linear network modeling approach can be applied to construct the acoustic response of the composed configuration from the responses of its constituting elements. This approach requires registering the average velocity on a properly chosen intermediate plane between the burner and heat exchanger. Choosing this plane may be to some point difficult, i.e. when the burner and heat exchanger are close and cannot be considered independent. Moreover, when flame impingement occurs, the interactions between the flame and heat exchanger affect their individual thermoacoustic behaviors and the burner plus heat exchanger assembly needs to be considered as one coupled acoustic element. Particularly, flame impingement changes the phase of the heat absorption response of the heat exchanger and it may significantly alter the acoustic properties of the coupled assembly. The physics lying behind the effects of such interactions on the thermoacoustics of the system is discussed. The obtained results signify that a correct stability prediction of an appliance with burner and heat exchangers requires considering active thermoacoustic behavior of both elements as well as their interactions.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Combustion instability, Heat exchanger, Laminar flame, Thermoacoustic, Transfer function, Transfer matrix
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-227580 (URN)10.1016/j.combustflame.2018.01.030 (DOI)000430527600041 ()2-s2.0-85042121307 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20180509

Available from: 2018-05-09 Created: 2018-05-09 Last updated: 2018-05-15Bibliographically approved
Manzari, L., Mao, H., Göransson, P., Cuenca, J. & Lopez Arteaga, I. (2018). Experimental-numerical methods for inverse characterization of the anisotropic-anelastic properties of porous materials, based on dynamic Digital Image Correlation. In: Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics: . Paper presented at 28th International Conference on Noise and Vibration Engineering, ISMA 2018 and 7th International Conference on Uncertainty in Structural Dynamics, USD 2018; Leuven; Belgium; 17 September 2018 through 19 September 2018 (pp. 687-695).
Open this publication in new window or tab >>Experimental-numerical methods for inverse characterization of the anisotropic-anelastic properties of porous materials, based on dynamic Digital Image Correlation
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2018 (English)In: Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics, 2018, p. 687-695Conference paper, Published paper (Refereed)
Abstract [en]

One of the major challenges in accurately modeling poroelastic materials is the choice of the parametersrequired for their modeling, immediately followed by the practical difficulty in obtaining them. The direc-tional dependencies of the physical properties further complicate the task of designing experimental setupscapable of providing the macroscopic properties. In the work presented here, the focus has been set on theacquisition of high quality displacement data by means of two high-speed cameras and 3D Digital ImageCorrelation. The obtained displacement field, is fed into a general inverse formulation which is guided by anoptimization tool that minimizes the difference between the predicted and the measured data. As a minimumis found, the corresponding parameters are interpreted as material properties for a certain physical model.The solutions for each iteration are calculated with numerical prediction tools, in the cases discussed herethe finite element method, where it must be ascertained that the numerical errors are kept to a minimal level

National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-240271 (URN)2-s2.0-85060369851 (Scopus ID)9789073802995 (ISBN)
Conference
28th International Conference on Noise and Vibration Engineering, ISMA 2018 and 7th International Conference on Uncertainty in Structural Dynamics, USD 2018; Leuven; Belgium; 17 September 2018 through 19 September 2018
Funder
Swedish Research Council
Note

QC 20181214

Available from: 2018-12-13 Created: 2018-12-13 Last updated: 2019-03-26Bibliographically approved
Hosseini, N., Kornilov, V. N., Lopez Arteaga, I., Polifke, W., Teerling, O. J. & de Goey, L. P. (2018). Intrinsic thermoacoustic modes and their interplay with acoustic modes in a Rijke burner. International Journal of Spray and Combustion Dynamics, 10(4), 315-325
Open this publication in new window or tab >>Intrinsic thermoacoustic modes and their interplay with acoustic modes in a Rijke burner
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2018 (English)In: International Journal of Spray and Combustion Dynamics, ISSN 1756-8277, Vol. 10, no 4, p. 315-325Article in journal (Refereed) Published
Abstract [en]

The interplays between acoustic and intrinsic modes in a model of a Rijke burner are revealed and their influence on the prediction of thermoacoustic instabilities is demonstrated. To this end, the system is examined for a range of time delays, temperature ratios and reflection coefficients as adjustable parameters. A linear acoustic network model is used and all modes with frequency below the cut-on frequency for non-planar acoustic waves are considered. The results show that when reflection coefficients are reduced, the presence of a pure ITA mode limits the reduction in the growth rate that usually results from a reduction of the reflection coefficients. In certain conditions, the growth rates can even increase by decreasing reflections. As the time delay of the flame and thus the ITA frequency decreases, the acoustic modes couple to and subsequently decouple from the pure ITA modes. These effects cause the maximum growth rate to alternate between the modes. This investigation draws a broad picture of acoustic and intrinsic modes, which is crucial to accurate prediction and interpretation of thermoacoustic instabilities.

Place, publisher, year, edition, pages
Sage Publications, 2018
Keywords
Intrinsic thermoacoustic instability, Rijke burner, network model, acoustic mode, ITA mode
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-240742 (URN)10.1177/1756827718782884 (DOI)000453453000005 ()2-s2.0-85058561681 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, FP7-PEOPLE-ITN-2012.FP7-PEOPLE-ITN-2012.
Note

QC 20190108

Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved
Zea, E. & Lopez Arteaga, I. (2018). On modified wavenumber filters for rail contribution estimations [Letter to the editor]. Journal of the Acoustical Society of America, 144, EL286-EL289
Open this publication in new window or tab >>On modified wavenumber filters for rail contribution estimations
2018 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 144, p. EL286-EL289Article in journal, Letter (Refereed) Published
Abstract [en]

This brief communication exposes an overview of various wavenumber filters to separate the rail contribution to pass-by noise via the wave signature extraction method [Zea, Manzari, Squicciarini, Feng, Thompson, and Lopez Arteaga, J. Sound Vib. 409, 24–42 (2017)]. It has been found that the originally proposed filters underesti- mate the rail noise at frequencies above 1.6 kHz due to the presence of higher-order wave families that is unaccounted for. The goal of this let- ter is thus to propose and examine different filter functions that can cap- ture such waves, and to assess whether the rail contribution estimations can be improved.

National Category
Fluid Mechanics and Acoustics Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-236475 (URN)10.1121/1.5063453 (DOI)000454101100006 ()2-s2.0-85055137254 (Scopus ID)
Funder
Swedish Research Council, 2016-04366
Note

QC 20181019

Copyright 2018 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

The following article appeared in The Journal of the Acoustical Society of America 144, EL286 (2018) and may be found at http://asa.scitation.org/doi/10.1121/1.5063453.

Available from: 2018-10-17 Created: 2018-10-17 Last updated: 2019-01-15Bibliographically approved
Zea, E. & Lopez Arteaga, I. (2018). Simplified wave signature extraction method for rail contribution estimations. In: : . Paper presented at Euronoise.
Open this publication in new window or tab >>Simplified wave signature extraction method for rail contribution estimations
2018 (English)Conference paper, Published paper (Other academic)
Abstract [en]

The present paper investigates a modified implementation of the wave signature extraction (WSE) method [1], whose aim is to separate the rail contribution to the pass-by noise of railway vehicles. The method requires a line microphone array parallel to the rail, and two accelerometers on the rail in the vertical and lateral direction. The motivation for this work is the need to separate the rail contribution to the pass-by noise of railway vehicles. The WSE method [1] is based on the wavenumber domain filtering of pass-by data measured with a microphone array located in the near-field of the rail. The filter design does not require a priori information of the structural properties of the rail, since the required information is obtained from array pressure data and rail vibration data before and after the train passes in front of the array. The filter is such that it extracts the dispersion plot branches of the first family of horizontal and vertical bending waves (moving band-pass filter). Although the comparison with TWINS simulation data provides very promising results, there are discrepancies at the higher frequencies, possibly due to the onset of new bending wave families. Therefore in the present paper we assess the performance of a simplified WSE method, where a moving low-pass filter is used instead, and the results are compared to the original WSE implementation and the TWINS simulation data. We show that the results in the higher frequency range are improved with respect to the original WSE implementation.

[1] Zea et al. Journal of Sound and Vibration 409, pp. 24–42, 2017

National Category
Vehicle Engineering Fluid Mechanics and Acoustics
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-229675 (URN)
Conference
Euronoise
Funder
EU, Horizon 2020, 636032
Available from: 2018-06-05 Created: 2018-06-05 Last updated: 2018-06-14Bibliographically approved
Manzari, L., Göransson, P., Cuenca, J. & Lopez Arteaga, I. (2018). Toward fully anisotropic viscoelastic material models using an automated high-speed optical rig. In: Tomasini, E P (Ed.), 13TH INTERNATIONAL CONFERENCE ON VIBRATION MEASUREMENTS BY LASER AND NONCONTACT TECHNIQUES, 2018: . Paper presented at 13th International Conference on Vibration Measurements by Laser and Noncontact Techniques, JUN 20-22, 2018, Ancona, ITALY. IOP PUBLISHING LTD, Article ID 012003.
Open this publication in new window or tab >>Toward fully anisotropic viscoelastic material models using an automated high-speed optical rig
2018 (English)In: 13TH INTERNATIONAL CONFERENCE ON VIBRATION MEASUREMENTS BY LASER AND NONCONTACT TECHNIQUES, 2018 / [ed] Tomasini, E P, IOP PUBLISHING LTD , 2018, article id 012003Conference paper, Published paper (Refereed)
Abstract [en]

This paper describes some of the algorithms that are employed in the post-processing of the data obtained from an automated high-speed optical rig. The setup, entirely designed by some of the authors, is used for measuring the full field displacement in time of anisotropic viscoelastic solids undergoing controlled dynamic excitation. The setup main goal is to provide complex transfer functions relating the three-dimensional sinusoidal displacement on the surface of the sample to the sinusoidal motion of the foundation, suitable for the inverse estimation of the dynamic properties of the material under analysis. The complete automation of the measurement process aims at maximizing repeatability and signal-to-noise ratio. In particular, a stereo high-speed camera system is responsible for the actual measurement, while a laser Doppler vibrometer is used for a preliminary autoranging procedure and for data validation. The camera system does not directly output the high-quality data that is needed for a successful, physically meaningful inverse estimation. Hence, here the algorithms described in this paper come into play. Since digital image correlation (DIC) may fail in some frames or in some regions of the pictures, a mask is applied and calculated for every measurement run to preserve information only where the success rate of the DIC algorithm is higher than a specified threshold. The sample is mounted on a foundation whose sides are flat: random sample consensus (RANSAC) and principal component analysis (PCA) are used to respectively eliminate outliers and find the best fitting plane to the foundation side - the measured displacement field can then be expressed in a local coordinate system, truly relative to the foundation. The transfer functions are now obtained in two steps: first an optimizer is used to fit a cosine to all the measured displacement time-series, then the complex amplitudes representing the motion of the sample faces are divided by the average of the complex amplitudes representing the motion of the foundation.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2018
Series
Journal of Physics Conference Series, ISSN 1742-6588 ; 1149
National Category
Signal Processing
Identifiers
urn:nbn:se:kth:diva-255474 (URN)10.1088/1742-6596/1149/1/012003 (DOI)000473528100003 ()2-s2.0-85060033083 (Scopus ID)
Conference
13th International Conference on Vibration Measurements by Laser and Noncontact Techniques, JUN 20-22, 2018, Ancona, ITALY
Note

QC 20190919

Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved
Lundberg, O., Kari, L. & Lopez Arteaga, I. (2017). A compact internal drum test rig for measurements of rolling contact forces between a single tread block and a substrate. Measurement, 103, 370-378
Open this publication in new window or tab >>A compact internal drum test rig for measurements of rolling contact forces between a single tread block and a substrate
2017 (English)In: Measurement, ISSN 0263-2241, E-ISSN 1873-412X, Vol. 103, p. 370-378Article in journal (Refereed) Published
Abstract [en]

A novel test rig design is presented which enables detailed studies of the three force components generated in the impact and release phase of rolling contact between a tyre tread block and a substrate. The design of the compact internal drum test rig provides realistic impact and release angles for the tread block-substrate contact and enables force measurements at high rolling speeds with a high signal-to-noise ratio. Measurements of the rolling contact forces are presented for different values of rolling velocity, static pre-load and acceleration. It is demonstrated that this test rig provides results which contribute to the understanding of tyre road interaction and can be used as input to modelling-based development of both tyres and roads aiming for improved handling, safety, energy efficiency and comfort.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Tread block, Road, Contact forces, Rubber friction, Rolling contact, Test rig
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-207648 (URN)10.1016/j.measurement.2016.12.041 (DOI)000400033300038 ()2-s2.0-84994633128 (Scopus ID)
Note

QC 20170607

Available from: 2017-06-07 Created: 2017-06-07 Last updated: 2017-11-10Bibliographically approved
Amlinger, H., Lopez Arteaga, I. & Leth, S. (2017). Impact of PWM switching frequency on the radiated acoustic noise from a traction motor. In: 2017 20th International Conference on Electrical Machines and Systems, ICEMS 2017: . Paper presented at 20th International Conference on Electrical Machines and Systems, ICEMS 2017, 11 August 2017 through 14 August 2017. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Impact of PWM switching frequency on the radiated acoustic noise from a traction motor
2017 (English)In: 2017 20th International Conference on Electrical Machines and Systems, ICEMS 2017, Institute of Electrical and Electronics Engineers Inc. , 2017Conference paper, Published paper (Refereed)
Abstract [en]

The radiated acoustic noise from a traction motor at low speeds is dominated by the noise of electromagnetic origin. For a motor operated from pulse width modulated (PWM) converters, the switching frequency of the converter will have a large impact on the noise. The total harmonic distortion of the motor phase currents and thus also the exciting forces, will decrease with increasing switching frequency. Furthermore, changing the switching frequency will shift the frequencies of the exciting forces, hence have an influence on the coincidence with structural resonances of the motor. Tests have been performed on a traction motor and a decrease in sound pressure level with increasing switching frequency has been quantified and analyzed.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2017
Keywords
Acoustic noise, Pulse width modulation (PWM), Switching frequency, Traction motor, Electric machinery, Pulse width modulation, Switching, Voltage control, Exciting forces, Low speed, Motor phase, Pulse width modulated converters, Sound pressure level, Structural resonance, Total harmonic distortion (THD), Traction motors
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-227093 (URN)10.1109/ICEMS.2017.8056206 (DOI)2-s2.0-85034653627 (Scopus ID)9781538632468 (ISBN)
Conference
20th International Conference on Electrical Machines and Systems, ICEMS 2017, 11 August 2017 through 14 August 2017
Note

QC 20180515

Available from: 2018-05-15 Created: 2018-05-15 Last updated: 2018-05-15Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3609-3005

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