Study recommandations to greatly reduce the transmission of vertical vibration to the operator.

Vibratory soil compactors are articulated vehicles designed to achieve efficient compaction of the soil and road base-layers through a vibratory drum/roller integrating an unbalanced rotating mass. The low frequency whole-body vibration are directly transmitted to the operator through the driver seat, which in the vast majority of the vehicles employed in Québec is limited to a polyurethane foam cushion. The results of this study suggest that the seat and the cabin mounts amplify the low frequency vibration for all the vehicles considered but this amplification is limited for the 13-ton compactor equipped with more sophisticated cab mounts. Furthermore, the dominant vibration in both compaction and travel modes occurred along the vertical axis, particularly for the 10-ton compactors that represent the largest proportion of such vehicles used in Québec. The transmission of vertical vibration to the operator could be greatly reduced through design and implementation of an adequately tuned suspension seat. The authors recommend actions to limit the vibration amplification. Analytical and simulation methods need to be developed to explore alternate designs of cabin and drum mounts for limiting the vibration exposure while preserving the compaction efficiency of the vehicle.

Evaluation of whole-body vibration exposure of operators of soil compactors(Évaluation de l'exposition aux vibrations globales du corps des opérateurs de compacteurs de sol). Rakheja, Subhash; Kordestani, Ario; Marcotte, Pierre
Studies and Research Projects / Report R-709, Montréal, IRSST, 2011, 72 pages.
http://www.irsst.qc.ca/media/documents/PubIRSST/R-709.pdf

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