UIC comfort tests - VTI

Appendix 3Page 2 (2)Evaluation of human exposure to whole-body vibration – Part 4: Guidelines forthe evaluation of the effects of vibration and rotational motion on passenger andcrew comfort in fixed guideway transport systems. This standard allows thestatistical method as a way to analysis vibrations.All these standards give guidelines for the evaluation of average comfort onmostly straight lines and not lines with many curves.Comfort on curvaceous lines has not been incorporated in any internationalstandard.2 Weighting curvesWeighting curves are defined according to ISO 2631-1 and BS 6841, see Figure 1.w b Weighting curve for vertical accelerations for comfort and health according toBS 6841:1987 (BSI 1987). w b is used for comfort evaluation according to theCEN standard (CEN 1996b). w b is not the primary weighting curve forvertical acceleration according to ISO 2631-1 but is acceptable for railwayapplications (ISO 1997).w d Weighting curve for lateral and longitudinal accelerations for comfort andhealth according to ISO 2631-1 (ISO 1997).w k Weighting curve for vertical accelerations for comfort and health according toISO 2631-1 (ISO 1997).w f Weighting curve for vertical accelerations for evaluation of motion sicknessaccording to ISO 2631-1 (ISO 1997).5Frequency weighting curvesComfort evaluation0Wf Motion sicknessWd LateralWb Verticalwk Vertical-5Gain [dB]-10-15Wd lateralWk vertical-20Wb vertical railwayWf motion sickness-250.01 0.1 1 10 100Frequency [Hz]Figure 1 Weighting curves w k , w d , w f (ISO 2631-,1 1997) and w b (BS 6841:1987,1987).VTI notat 56A-2003