Train passengers' ability to read and write during lateral vibration transients
2006 (English)Conference paper (Refereed)
In a passenger survey aboard Swedish Intercity trains a majority of the passengers reported disturbances due to vibration and shocks. Subsequent laboratory studies revealed that the difficulty of reading and writing displayed non-linear frequency characteristics for stationary vibrations in the lateral direction. In the present study a train mock-up was used to investigate the effect of lateral vibration transients on passengers' ability to read and write. The subjects sat leaning against the backrest with the work material placed on their lap during the exposures. In order to limit the influence of anthropometric differences, 21 subjects were recruited according to predefined body measures. The study consisted of three experimental parts (A, B, C). Part A and B comprised of six discrete sinusoidal frequencies (1.25 - 5.0 Iiz) with a stationary amplitude of 0.3 m/s2. Each frequency was superimposed with transient peaks of three amplitudes (0.7, 1.0, 1.4 m/s2). The transient peaks were one oscillation period long and had a sinusoidal shape. Each peak appeared randomly three times during the 25 s long sequences. The test subjects rated their experienced difficulty to read and write due to each transient vibration, using Borg's CR-I00 scale. In part C, nine amplitude levels (0.43 - 0.7 m/s2) were used for three frequencies (1.25, 2.0, 4.0 Hz). In this part the test subjects were instructed to press a button whenever their reading was disturbed by a vibration transient. The results showed that occasional vibration transients cause lower levels of difficulty than stationary vibrations. Further did, only 35% of the shocks at 0.7 m/s2 cause a disturbance while reading.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-5758ScopusID: 2-s2.0-84883311615ISBN: 978-162748150-2OAI: oai:DiVA.org:kth-5758DiVA: diva2:10235
13th International Congress on Sound and Vibration 2006, ICSV 2006, 2-6 July 2006, Vienna, Austria
QC 201411052006-05-172006-05-172014-11-05Bibliographically approved