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Lundberg, O., Finnveden, S., Björklund, S., Pärssinen, M. & Lopez Arteaga, I. (2015). A nonlinear state-dependent model for vibrations excited by roughness in rolling contacts. Journal of Sound and Vibration, 345(9), 197-213
Open this publication in new window or tab >>A nonlinear state-dependent model for vibrations excited by roughness in rolling contacts
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2015 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 345, no 9, p. 197-213Article in journal (Refereed) Published
Abstract [en]

A state-dependent method to model contact nonlinearities in rolling contacts is proposed. By pre-calculation of contact stiffness and contact filters as functions of vertical relative displacement, a computationally efficient modelling approach based on a moving point force description is developed. Simulations using the state-dependent model have been analysed by comparison with measurements. Results from the investigated case consisting of a steel ball rolling over a steel beam having two different degrees of roughness - show good agreement between nonlinear simulations and measured beam vibrations. The promising results obtained with the proposed method are potentially applicable to wheel rail interaction and rolling element bearings.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-155193 (URN)10.1016/j.jsv.2015.02.010 (DOI)000350998800013 ()2-s2.0-84924514876 (Scopus ID)
Note

QC 20150507. Updated from submitted to published.

Available from: 2014-11-03 Created: 2014-11-03 Last updated: 2017-12-05Bibliographically approved
Finnveden, S., Hörlin, N.-E. & Barbagallo, M. (2014). Dynamic characterization of viscoelastic porous foams used in vehicles based on an inverse finite element method. Journal of the Acoustical Society of America, 135(4), 1834-1843
Open this publication in new window or tab >>Dynamic characterization of viscoelastic porous foams used in vehicles based on an inverse finite element method
2014 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 135, no 4, p. 1834-1843Article in journal (Refereed) Published
Abstract [en]

Viscoelastic properties of porous materials, typical of those used in vehicles for noise insulation and absorption, are estimated from measurements and inverse finite element procedures. The measurements are taken in a near vacuum and cover a broad frequency range: 20 Hz to 1 kHz. The almost cubic test samples were made of 25mm foam covered by a "heavy layer" of rubber. They were mounted in a vacuum chamber on an aluminum table, which was excited in the vertical and horizontal directions with a shaker. Three kinds of response are measured allowing complete estimates of the viscoelastic moduli for isotropic materials and also providing some information on the degree of material anisotropicity. First, frequency independent properties are estimated, where dissipation is described by constant loss factors. Then, fractional derivative models that capture the variation with frequency of the stiffness and damping are adapted. The measurement setup is essentially two-dimensional and calculations are three-dimensional and for a state of plane strain. The good agreement between measured and calculated response provides some confidence in the presented procedures. If, however, the material model cannot fit the measurements well, the inverse procedure yields a certain degree of arbitrariness to the parameter estimation.

Keywords
Mechanical Parameters, Biots Equations, Melamine Foam, Model
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-148268 (URN)10.1121/1.4868361 (DOI)000338307200024 ()2-s2.0-84920403923 (Scopus ID)
Note

QC 20140805

Available from: 2014-08-05 Created: 2014-08-04 Last updated: 2017-12-05Bibliographically approved
Lundberg, O., Nordborg, A., Finnveden, S. & Lopez Arteaga, I. (2014). Estimation of nonlinearities in the wheel-rail rolling noise generation process. In: Proceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering and USD 2014 - International Conference on Uncertainty in Structural Dynamics: . Paper presented at 26th International Conference on Noise and Vibration Engineering, ISMA 2014, Including the 5th International Conference on Uncertainty in Structural Dynamics, USD 2014, Leuven, Belgium, 15-17 September 2014 (pp. 3485-3496).
Open this publication in new window or tab >>Estimation of nonlinearities in the wheel-rail rolling noise generation process
2014 (English)In: Proceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering and USD 2014 - International Conference on Uncertainty in Structural Dynamics, 2014, p. 3485-3496Conference paper, Published paper (Other academic)
Abstract [en]

The dynamics of wheel-rail interaction is predicted using a time-domain rolling contact model and a state-dependent method to model nonlinear contact forces in the wheel-rail interaction. Contact stiffness and contact filters are pre-calculated as functions of the vertical wheel-rail relative displacement (state-dependency) using three-dimensional surface data in quasi-static contact computations. By including the state-dependent functions in time-domain prediction of wheel-rail interaction, a computationally efficient method to include nonlinear effects is obtained. Results from predictions of contact forces as well as rail vibrations are presented for two conditions; first, both wheel and rail have surface roughness of broadband character and secondly, a rail corrugation is simulated by superimposing a sinusoidal component on the broadband rail roughness. For a train speed of 200 kph, the contact forces and the dynamic response of the rail exhibit nonlinear contact conditions for both the broadband roughness case as well as for the case where a rail corrugation is simulated.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-155196 (URN)000352201004026 ()2-s2.0-84913528676 (Scopus ID)978-907380291-9 (ISBN)
Conference
26th International Conference on Noise and Vibration Engineering, ISMA 2014, Including the 5th International Conference on Uncertainty in Structural Dynamics, USD 2014, Leuven, Belgium, 15-17 September 2014
Note

QC 20150512

Available from: 2014-11-03 Created: 2014-11-03 Last updated: 2015-05-12Bibliographically approved
Lundberg, O., Finnveden, S., Lopez Arteaga, I. & Björklund, S. (2014). Non-linear contact stiffness and dynamic contact filter for rolling contacts. In: FISITA 2014 World Automotive Congress - Proceedings: . Paper presented at 35th FISITA World Automotive Congress, 2014, 2 June 2014 through 6 June 2014. FISITA
Open this publication in new window or tab >>Non-linear contact stiffness and dynamic contact filter for rolling contacts
2014 (English)In: FISITA 2014 World Automotive Congress - Proceedings, FISITA , 2014Conference paper, Published paper (Refereed)
Abstract [en]

Rolling contacts present in passenger cars such as in bearings and transmission elements are sources of noise and vibration, principally for interior comfort concerns. Moreover, tyre/road noise is the main source of road traffic noise which in turn leads to sleep disturbance and annoyance. In order to simulate friction losses as well as generated noise and vibrations in any rolling contact, it is crucial to have a correct description of the dynamic excitation caused by the roughness of the surfaces in contact. In this paper, a state-dependent modelling approach previously proposed by the authors is applied to a well-defined steel-steel rolling contact. A parametric study investigating the influence of rolling speed on contact conditions is performed, indicating the limits for the use of linear point force expressions for the rolling contact investigated. The state-dependent method is based on pre-calculation of contact stiffness and contact filtering as functions of vertical relative displacement. This leads to a computationally efficient way to include the influence of surface roughness and shape of the contacting bodies in a point force expression. Only vertical contact forces are studied within the scope of this work. Tangential friction forces are likely to affect the resulting vibrations and should therefore be further studied. 

Place, publisher, year, edition, pages
FISITA, 2014
Keywords
Contact, Rolling, Roughness, State-dependent, Vibration, Contacts (fluid mechanics), Noise pollution, Rolling resistance, Stiffness, Computationally efficient, Dynamic excitations, Noise and vibration, Non-linear contact stiffness, Relative displacement, Tangential friction force, Surface roughness
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-246648 (URN)2-s2.0-85060470126 (Scopus ID)
Conference
35th FISITA World Automotive Congress, 2014, 2 June 2014 through 6 June 2014
Note

QC 20190619

Available from: 2019-06-19 Created: 2019-06-19 Last updated: 2019-06-19Bibliographically approved
Orrenius, U., Liu, H., Wareing, A., Finnveden, S. & Cotoni, V. (2014). Wave modelling in predictive vibro-acoustics: Applications to rail vehicles and aircraft. Wave motion, 51(4), 635-649
Open this publication in new window or tab >>Wave modelling in predictive vibro-acoustics: Applications to rail vehicles and aircraft
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2014 (English)In: Wave motion, ISSN 0165-2125, E-ISSN 1878-433X, Vol. 51, no 4, p. 635-649Article in journal (Refereed) Published
Abstract [en]

Three different predictive methods based on wave descriptions of the acoustic field are presented and used to calculate transmission and radiation properties of typical rail and aerospace structures. First, a transfer matrix method assesses the sound transmission and wavenumbers of composite sandwich fuselage structures in a wide frequency range. The method is computationally effective and can be used for numerical optimization of sandwich lay-ups common in rail and aerospace engineering. Further, an approach for which a small finite element model of a periodic cell is applied to create a statistical model of a near periodic structure is shown to determine transmission and radiation properties of stiffened fuselage structures and an extruded train floor structure. Finally, a novel combination of the waveguide FE method with the Rayleigh-Ritz method is applied to: (i) calculate the transmission through a double wall structure; (ii) again assess the sound transmission of an extruded floor structure and also (iii) determine the sound pressure inside a large section of a rail car excited by external sound sources. All three methods presented can be used to effectively support decision making in the design process of trains and aircraft.

Keywords
Wave modelling, Finite element, Sound transmission, Sound radiation, Air-craft structure, Rail-car structure
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-146135 (URN)10.1016/j.wavemoti.2013.11.007 (DOI)000335609800009 ()2-s2.0-84898004644 (Scopus ID)
Note

QC 20140611

Available from: 2014-06-11 Created: 2014-06-09 Last updated: 2017-12-05Bibliographically approved
Liu, H., Finnveden, S., Barbagallo, M. & Lopez Arteaga, I. (2014). Wave propagation in sandwich panels with a poroelastic core. Journal of the Acoustical Society of America, 135(5), 2683-2693
Open this publication in new window or tab >>Wave propagation in sandwich panels with a poroelastic core
2014 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 135, no 5, p. 2683-2693Article in journal (Refereed) Published
Abstract [en]

Wave propagation in sandwich panels with a poroelastic core, which is modeled by Biot's theory, is investigated using the waveguide finite element method. A waveguide poroelastic element is developed based on a displacement-pressure weak form. The dispersion curves of the sandwich panel are first identified as propagating or evanescent waves by varying the damping in the panel, and wave characteristics are analyzed by examining their motions. The energy distributions are calculated to identify the dominant motions. Simplified analytical models are also devised to show the main physics of the corresponding waves. This wave propagation analysis provides insight into the vibro-acoustic behavior of sandwich panels lined with elastic porous materials.

Keywords
Finite-Element-Method, Sound-Transmission, Fluid, Motion, Equations, Guides, Plates, Formulations, Prediction, Media
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-147053 (URN)10.1121/1.4869090 (DOI)000336160000027 ()2-s2.0-84900430416 (Scopus ID)
Note

QC 20140624

Available from: 2014-06-24 Created: 2014-06-23 Last updated: 2017-12-05Bibliographically approved
Barbagallo, M. & Finnveden, S. (2013). A self-adjoint variational principle for anisotropic viscoelastic Biot’s equations. International Journal of Engineering Science, 63, 71-83
Open this publication in new window or tab >>A self-adjoint variational principle for anisotropic viscoelastic Biot’s equations
2013 (English)In: International Journal of Engineering Science, ISSN 0020-7225, E-ISSN 1879-2197, Vol. 63, p. 71-83Article in journal (Refereed) Published
Abstract [en]

A variational principle for anisotropic viscoelastic Biot’s equations of motion is presented. It is based upon an extended Hamilton’s principle, also valid for dissipative systems. Using this principle, a functional analogous to the Lagrangian is defined, starting from Biot’s variational formulation based on frame and fluid displacements. Then, a mixed displacement–pressure formulation is presented, which reduces the number of variables of response from six to four. The corresponding functional analogous to the Lagrangian is derived making full use of variational calculus. The derived functionals are self-adjoint and stationary for true motion.

Keywords
Porous materials, Biot’s equations, Variational principles, Dissipative systems
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-118435 (URN)10.1016/j.ijengsci.2012.06.019 (DOI)000315363000008 ()
Funder
Swedish Research Council, 621-2005-5754EU, European Research Council, 218508
Note

QC 20130218

Available from: 2013-02-18 Created: 2013-02-18 Last updated: 2017-12-06Bibliographically approved
Barbagallo, M. & Finnveden, S. (2013). Characterisation of a generic trim-panel: sound reduction index and material parameters.
Open this publication in new window or tab >>Characterisation of a generic trim-panel: sound reduction index and material parameters
2013 (English)Report (Other academic)
Publisher
p. 11
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-118441 (URN)
Note

QC 20130218

Available from: 2013-02-18 Created: 2013-02-18 Last updated: 2013-02-18Bibliographically approved
Lundberg, O., Finnveden, S., Lopez Arteaga, I. & Björklund, S. (2013). Non-linear contact forces for beam/ball-interaction and its influence on the dynamic response of the beam. In: 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life. Paper presented at 42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013; Innsbruck; Austria; 15 September 2013 through 18 September 2013 (pp. 238-247). OAL-Osterreichischer Arbeitsring fur Larmbekampfung
Open this publication in new window or tab >>Non-linear contact forces for beam/ball-interaction and its influence on the dynamic response of the beam
2013 (English)In: 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life, OAL-Osterreichischer Arbeitsring fur Larmbekampfung , 2013, p. 238-247Conference paper, Published paper (Refereed)
Abstract [en]

A well-defined rolling contact problem is studied with the intention to cover interesting aspects of tyre-road contact modeling and rolling contact in general. More specifically, the dynamic response in a steel beam caused by a steel ball rolling over it is studied by theoretical modeling of the beam- And ball dynamics as well as the contact forces. Validation of the dynamic response simulations is achieved by comparison with measurements. The contact model is shown to be greatly dependent on an accurate estimate of the real contact stiffness. A method to estimate the contact stiffness which leads to good accuracy in dynamic response simulations is presented. Although the contact stiffness is significantly lower for rubber- Asphalt interaction than for steel-steel contact, the results give useful insight for tyre-road contact modeling.

Place, publisher, year, edition, pages
OAL-Osterreichischer Arbeitsring fur Larmbekampfung, 2013
Keywords
Non-linear, contact, surface
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-136579 (URN)2-s2.0-84904504817 (Scopus ID)978-163266267-5 (ISBN)
Conference
42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013; Innsbruck; Austria; 15 September 2013 through 18 September 2013
Funder
Vinnova
Note

QC 20131219

Available from: 2013-12-06 Created: 2013-12-06 Last updated: 2014-09-15Bibliographically approved
Finnveden, S. & Hao, L. (2012). Chap 8, Waveguide Finite Element Method. In: Wim Desmet, Bert Pluymer, Onur Atak (Ed.), Mid-Frequency, CAE Methodologies for Mid-Frequency Analysis in Vibration and Acoustics: . Leuven: KUL
Open this publication in new window or tab >>Chap 8, Waveguide Finite Element Method
2012 (English)In: Mid-Frequency, CAE Methodologies for Mid-Frequency Analysis in Vibration and Acoustics / [ed] Wim Desmet, Bert Pluymer, Onur Atak, Leuven: KUL , 2012Chapter in book (Other academic)
Place, publisher, year, edition, pages
Leuven: KUL, 2012
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-139070 (URN)978-94-6018-523-6 (ISBN)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20140113

Available from: 2014-01-03 Created: 2014-01-03 Last updated: 2014-01-13Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9031-3662

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