A comparison of evaluations and assessments obtained using alternative standards for predicting the hazards of whole-body vibration and repeated shocks.
International Conference on Whole-Body Vibration Injuries. Southampton, GBR, 1997/09/15.
There are three current standards that might be used to assess the vibration and shock transmitted by a vehicle seat with respect to possible effects on human health : ISO 2631/1 (1985), BS 6841 (1987) and ISO 2631-1 (1997).
Evaluations have been performed on the seat accelerations measured in nine different transport environments (bus, car, mobile crane, fork-lift truck, tank, ambulance, power boat, inflatable boat, mountain bike) in conditions that might be considered severe.
For each environment, limiting daily exposure durations were estimated by comparing the frequency weighted root mean square (i.e., r.m.s.) accelerations and the vibration dose values (i.e., VDV), calculated according to each standard with the relevant exposure limits, action level and health guidance caution zones.
Very different estimates of the limiting daily exposure duration can be obtained using the methods described in the three standards.
Differences were observed due to variations in the shapes of the frequency weightings, the phase responses of the frequency weighting filters, the method of combining multi-axis vibration, the averaging method, and the assessment method.
With the evaluated motions, differences in the shapes of the weighting filters resulted in up to about 31% difference in r.m.s. acceleration between the « old » and the « new'ISO standard and up to about 14% difference between BS 6841 and the » new ISO 2631. (...)
Mots-clés Pascal : Homme, Risque accidentel, Vibration maladie, Choc mécanique, Corps entier, Position assise, Biomécanique, Norme ISO, Exposition professionnelle, Santé
Mots-clés Pascal anglais : Human, Hazard, Vibration disease, Mechanical shock, Whole body, Seated position, Biomechanics, ISO standard, Occupational exposure, Health
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0501598
Code Inist : 002A08D. Création : 19/02/1999.