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Vibration Excitation at Turnouts, Mechanism, Measurements and Mitigation Measures

  • There is a strong need for cost-effective mitigation measures for turnouts. SBB has initiated a series of examinations using different methodologies to gain a deeper understanding of the excitation mechanisms at low frequencies, in addition to that obtained in the RIVAS project. To date it is not yet clear what constitutes a complete measurement data set that would enable understanding most of the vibration excitation mechanisms in turnouts. Increasing vibration at turnouts in comparison to normal track is observed for all measured frequencies. The different methodologies are presented in the paper. Under-sleeper pads (USP) are a cost-effective method to reduce vibration at frequencies above 63 Hz (1/3 octave), but there is probably no improvement for frequencies below 63 Hz. A first test of new frog geometry did not show relevant improvements in Vibration emission in comparison to a reference frog geometry. Axle box acceleration measurements are an interesting method to identifyThere is a strong need for cost-effective mitigation measures for turnouts. SBB has initiated a series of examinations using different methodologies to gain a deeper understanding of the excitation mechanisms at low frequencies, in addition to that obtained in the RIVAS project. To date it is not yet clear what constitutes a complete measurement data set that would enable understanding most of the vibration excitation mechanisms in turnouts. Increasing vibration at turnouts in comparison to normal track is observed for all measured frequencies. The different methodologies are presented in the paper. Under-sleeper pads (USP) are a cost-effective method to reduce vibration at frequencies above 63 Hz (1/3 octave), but there is probably no improvement for frequencies below 63 Hz. A first test of new frog geometry did not show relevant improvements in Vibration emission in comparison to a reference frog geometry. Axle box acceleration measurements are an interesting method to identify defects in a turnout. A specialized measurement system of rail roughness could identify certain geometry Problem areas for some frogs. Noise increases also are observed at turnouts for frequencies ranging between 80 to 1000 Hz. The use of railway source models to calculate contact forces for ballasted track and turnouts seems promising, in particular for understanding the influence of ground.zeige mehrzeige weniger

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Metadaten
Autor*innen:R. Müller, Y. Brechbühl, S. Lutzenberger, Samir Said, Lutz AuerschORCiD, C. Guigou-Carter, M. Villot, R. Müller
Persönliche Herausgeber*innen:G. Degrande, et al.
Dokumenttyp:Beitrag zu einem Sammelband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Noise and Vibration Mitigation for Rail Transportation Systems, Proceedings of the 13th International Workshop on Railway Noise, Notes on Numerical Fluid Mechanics and Multidisciplinary Design 150
Jahr der Erstveröffentlichung:2021
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.2 Ingenieurbau
Verlag:Springer Nature Switzerland AG
Verlagsort:Cham
Jahrgang/Band:150
Erste Seite:403
Letzte Seite:410
Freie Schlagwörter:Switch; Turnout; Vibration excitation; Vibration measurements
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
DOI:10.1007/978-3-030-70289-2_42
ISSN:1612-2909
ISBN:978-3-030-70288-5
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:10.05.2021
Referierte Publikation:Nein
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