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Effects of vibration on sedentary activities in passenger trains
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology.
2007 (English)In: Journal of Low Frequency Noise Vibration and Active Control, ISSN 0263-0923, Vol. 26, no 1, 43-55 p.Article in journal (Refereed) Published
Abstract [en]

The effects of vibration on train passengers' sedentary activities were investigated with a questionnaire survey as well as onboard vibration measurements. Three types of Swedish inter-regional trains were studied on four different lines. 330 passengers were randomly selected for the questionnaire survey. The vibration measurements were made at five positions around a passenger seat above the bogie during normal service. The vibration data were weighted according to ISO 2631-1 and the older German (Sperling) Ride Index Wz. Two-thirds of the passengers reported difficulties in performing sedentary activities such as reading and writing due to vibration and shocks. However, the standardized measurements did not reveal any severe discomfort values due to the vibration. This reveals that ISO and Wz standards do not evaluate vibrations effect on sedentary activities correctly. This also indicates that even low levels of vibration can reduce the ability to perform sedentary activities. Both chair and table produced more vibration than the floor. The spectral analysis showed that the chair had nearly the same frequency content as the floor, below 10 Hz. This range is critical since it coincides with the most vulnerable range for reading and writing as well as the perception of ride comfort.

Place, publisher, year, edition, pages
2007. Vol. 26, no 1, 43-55 p.
National Category
Vehicle Engineering
URN: urn:nbn:se:kth:diva-5756DOI: 10.1260/026309207781487448ISI: 000248829400004ScopusID: 2-s2.0-36048977638OAI: diva2:10233
Uppdaterad från submitted till published: 20100921 QC 20100921 Available from: 2006-05-17 Created: 2006-05-17 Last updated: 2011-11-03Bibliographically approved
In thesis
1. Difficulties to Read and Write Under Lateral Vibration Exposure: Contextual Studies Of Train Passengers Ride Comfort
Open this publication in new window or tab >>Difficulties to Read and Write Under Lateral Vibration Exposure: Contextual Studies Of Train Passengers Ride Comfort
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Many people use the train both as a daily means of transport as well as a working place to carry out activities such as reading or writing. There are, however, several important factors in this environment that will hamper good performance of such activities. Some of the main sources of disturbance, apart form other train passengers, are noise and vibrations generated from the train itself.

Although there are standards available for evaluation of ride comfort in vehicles none of them consider the effects that vibrations have on particular passengers' activities.

To address these issues, three different studies were conducted to investigate how low frequency lateral vibrations influence the passengers' ability to read and write onboard trains.

The first study was conducted on three types of Inter-Regional trains during normal service and included both a questionnaire survey and vibration measurements. Two proceeding laboratory studies were conducted in a train mock-up where the perceived difficulty of reading and writing was evaluated for different frequencies and amplitudes. To model and clarify how vibrations influence the processes of reading and writing the fundamentals of Human Activity Theory was used as a framework in this thesis.

In the field study about 80% of the passengers were found to be reading at some point during the journey, 25% were writing by hand, and 14% worked with portable computers. The passengers applied a wide range of seated postures for their different activities.

According to the standardised measurements, even the trains running on poor tracks showed acceptable levels of vibration. However, when the passengers performed a short written test, over 60 % reported to be disturbed or affected by vibrations and noise in the train.

In the laboratory studies it was found that the difficulty in reading and writing is strongly influenced by both vibration frequency and acceleration amplitude. The vibration spectra of real trains were found to correspond well to the frequency characteristics of the rated difficulty. It was also observed that moderate levels of difficulty begin at fairly low vibration levels. Contextual parameters like sitting posture and type of activity also showed strong influence on how vibrations cause difficulty.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 70 p.
Trita-AVE, ISSN 1651-7660 ; 2006:24
lateral vibrations, passenger activities, reading, writing, sitting posture, frequency weighting, rated difficulty, field study, laboratory study, transient vibrations, stationary vibrations.
National Category
Vehicle Engineering
urn:nbn:se:kth:diva-3974 (URN)91-7178-374-1 (ISBN)
Public defence
2006-06-02, D3, Lindstedsvägen 5, Stockholm, 10:00
Available from: 2006-05-17 Created: 2006-05-17 Last updated: 2010-09-22Bibliographically approved

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