Active Control of Lateral Vibrations in a Railway Carriage

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Sven Johansson, Lars Håkansson, Per Persson, Ingvar Claesson
Title: Active Control of Lateral Vibrations in a Railway Carriage
Journal: International Journal of Acoustics and Vibration
Year: 2002
Volume: 7
Issue: 4
Pagination: 195-210
ISSN: 1027-5851
Publisher: Int.Inst. of Acoustics and Vibration(IIAV)
Organization: Blekinge Institute of Technology
Department: Department of Telecommunications and Signal Processing (Institutionen för telekommunikation och signalbehandling)
Department of Telecommunications and Signal Processing S-372 25 Ronneby
+46 455 38 50 00
Language: English
Abstract: As trains are continually designed for higher and higher speeds
the problems of railway carriage vibration are on the
increase. Lateral vibrations in a railway carriage are
noticeable to passengers if the vibration frequencies are lower
than approximately 20 Hz. Below this frequency discomfort is a common problem for the
passengers and below approximately 1 Hz motion sickness is a problem.
The passive solution of stiffening the carriage chassis to shift the
vibrational frequencies higher up results in inflated
manufacturing and running costs, and opposes higher travel
speeds due to increased weight. Semi-passive solutions such as
modifying the structural dynamics of the carriage body by
decoupling heavy underfloor equipment do not reduce the
vibrations sufficiently. However, by appending a
multi-reference feedforward active vibration control system, one
way expect a substantial reduction in the lateral vibration
level. Using a dynamic computer model of a railway carriage
simulating the lateral vibration, and using as input bogie
acceleration data measured on a running train,
multiple-input/single-output coherence spectra were shown to
constitute a suitable set of reference signals for an active
control system. Control simulations based on the Feedforward
Multiple-Input/Single-Output Filtered-x LMS Algorithm are
carried out using different reference signal combinations. The
control results indicate lateral vibration attenuation on the
order of 15dB at the objective frequency of 10Hz.
Subject: Signal Processing\Active Noise and Vibration Control
Keywords: active vibration control , train vibration, feed forward control, lms, coherence
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