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Modelling and simulation of electromagnetic audible noise generated by traction motors
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

An annoying tonal noise is produced by modern electrical trains duringacceleration and deceleration. This noise is caused by electromagneticforces generating structural vibrations, especially from the traction motors.The electromagnetic noise is dominant at low train speeds and affectsboth the passengers on the train and on platforms, as well as peopleliving near the track. The focus on this issue has increased the last years,both regarding legislation, contractual requirements and also because ofexpectations from citizens and travelers. To be able to design low noiseelectric drive systems, a thorough understanding of the cause and thepossibility to predict the electromagnetic noise is needed. This thesisdescribes the modelling and simulation of an complete multi-physicsreal-time environment for prediction and analysis of the electromagneticnoise. The simulation results are validated against measurements of thestructural vibration and acoustic response of a real traction motor fed bya power converter running in the entire operational range.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. , 36 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:84
Keyword [en]
Vibro-acoustics, Electromagnetic noise, traction motor, modal analysis, multi-physics
National Category
Mechanical Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-195746ISBN: 978-91-7729-200-5OAI: oai:DiVA.org:kth-195746DiVA: diva2:1047241
Presentation
2016-12-14, E2, Lindstedtsvägen 3 (floor 3), KTH - Royal Institute of Technology, Stockholm, 10:00 (English)
Supervisors
Note

QC 20161118

Available from: 2016-11-18 Created: 2016-11-09 Last updated: 2016-11-23Bibliographically approved
List of papers
1. Combined Experimental and Analytical Vibro-Acoustic Model of an Electrical Motor
Open this publication in new window or tab >>Combined Experimental and Analytical Vibro-Acoustic Model of an Electrical Motor
2016 (English)In: Journal of Experimental MechanicsArticle, book review (Other academic) Submitted
Abstract [en]

A vibro-acoustic modal model of a traction motor forrailway applications is presented based on an experimentalmodal analysis of the system. Noise requirements forrailway traction motors are getting more and moredemanding as part of the overall levels of new rolling stock.It is therefore of great interest to understand and predict thevibro-acoustic behaviour of electromagnetic noisegenerated by traction motors. The modal parameters arederived from an experimental modal analysis. The primarysource for the radiated sound of the tested traction motor isthe radial deflections of the stator shield. The modalparameters for the radial deflections are implemented in areduced order modal model in a state space format usingMatlab/Simulink. Only the structural modes that have amatch in both the frequency and the spatial domain withthe electromagnetic excitation force will cause animportant vibro-acoustic response. This makes it possibleto create an accurate and efficient reduced order modalmodel with only a fraction of the total number of structuralmodes. The simulation results from the modal model arecompared to measured levels of vibration and acousticmeasurements of the motor.

National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-195739 (URN)
Note

QCR 20161114

Available from: 2016-11-09 Created: 2016-11-09 Last updated: 2016-11-18
2. Modelling framework for electromagnetic noise generation from traction motors
Open this publication in new window or tab >>Modelling framework for electromagnetic noise generation from traction motors
2016 (English)In: Journal of Notes on Numerical Fluid Mechanics and Multidisciplinary DesignArticle in journal (Other academic) Submitted
Abstract [en]

Electromagnetic noise from traction motors is often the single most dominating noise source from trains at low trainspeeds. This electromagnetic noise is tonal and annoying for both passengers on the train and people near the track andon the platform. A thorough understanding of the cause and the prediction of the electromagnetic noise is needed to beable to design low noise components. This paper describes a real time multi-physics modelling framework forprediction of the audible electromagnetic noise generated by traction motors fed by power converters. The cause of theelectromagnetic noise is influenced by several different domains. To be able to fully simulate the final acoustic sound,all these domains needs to be modelled and simulated together. Simulations of some relevant operational conditionsfor acoustic noise generation has been performed and discussed. Some of these results have been compared to realmeasurements from a converter fed traction motor.

National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-195741 (URN)
Note

QCR 20161114

Available from: 2016-11-09 Created: 2016-11-09 Last updated: 2016-11-18

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Botling, Fredrik
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Marcus Wallenberg Laboratory MWL
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