Effects of elastic seats on seated body apparent mass responses to vertical whole body vibration

Type de document

Études primaires

Année de publication

2015

Langue

Anglais

Titre de la revue

Ergonomics

Première page

1175

Dernière page

1190

Résumé

Apparent mass (AM) responses of the body seated with and without a back support on three different elastic seats (flat and contoured polyurethane foam (PUF) and air cushion) and a rigid seat were measured under three levels of vertical vibration (overall rms acceleration: 0.25, 0.50 and 0.75 m/s2) in the 0.5 to 20 Hz range. A pressure-sensing system was used to capture biodynamic force at the occupant-seat interface. The results revealed strong effects of visco-elastic and vibration transmissibility characteristics of seats on AM. The response magnitudes with the relatively stiff air seat were generally higher than those with the PUF seats except at low frequencies. The peak magnitude decreased when sitting condition was changed from no back support to a vertical support; the reduction however was more pronounced with the air seat. Further, a relatively higher frequency shift was evident with soft seat compared with stiff elastic seat with increasing excitation.

Mots-clés

Siège, Seat, Posture assise. Sitting posture, Dossier, Back rest, Vibration au corps entier, Whole-body vibration

Numéro de projet IRSST

0099-6300

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