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It is widely recognized in the field of safety at workplace that professional exposure to whole-body vibration (WBV) may generate unfavorable effects on workers’ health. Among many involved categories, professional drivers are clearly one of the most exposed groups, as exposure time may last for the whole working period. This research is based on the results of measurements gathered from 14 subjects who drove vehicles for urban use. In particular, in order to highlight the effects of vehicle armoring on professional WBV dose, two sampling campaigns were carried out. In the first case, a car for standard use was used while, in the second one, another vehicle of the same model was modified with the installation of the armor-plate for ballistic protection. The assessment was carried out in accordance with ISO 2631-1(97), under the same boundary conditions, and finally the daily e xposure parameter was assessed. Furthermore, to allow a comparison independent of individual f actors, the exposed subjects were divided into homogeneous groups of different classes based on their body weight and height. The results obtained showed that WBV exposure is clearly connected with vehicle characteristics. In particular, the installation of bulletproof armor, contributing to a change in the car mass distribution and its total weight, determines a generalized reduction of professional dose. This reduction may be quantified in a range from 10% to 20% depending on the individual characteristics of the driver.
armored vehicles, whole-body vibration, worker exposure.
[1] Paddan, G.S. & Griffin, M.J., Effect of seating on exposures to whole-body vibration in vehicles. Journal of Sound and Vibration, 253(1), pp. 215–241, 2002. http://dx.doi.org/10.1006/jsvi.2001.4257
[2] Rakheja, S., Dong, R.G., Patra, S., Boileau, P.É., Marcotte, P. & Warren, C., Biodynamics of the human body under whole-body vibration: Synthesis of the reported data. International Journal of Industrial Ergonomics, 40, pp. 710–732, 2010. http://dx.doi.org/10.1016/j.ergon.2010.06.005
[3] Lewis, C.H. & Griffin, M.J., Evaluating the vibration isolation of soft seat cushions using an active anthropodynamic dummy. Journal of Sound and Vibration, 253(1), pp. 295–311, 2002. http://dx.doi.org/10.1006/jsvi.2001.4261
[4] Paddan, G.S., Mansfield, N.J., Arrowsmith, C.I., Rimell, A.N., King, S.K. & Holmes, S.R., The influence of seat backrest angle on perceived discomfort during exposure to vertical whole-body vibration. Ergonomics, 55(8), pp. 923–936, 2012.
http://dx.doi.org/10.1080/00140139.2012.684889
[5] Alfaro Degan, G., Lippiello, D. & Pinzari, M. Whole body vibrations: experimental assessment of anthropometric differences on the effects of WBV exposure in quarry workers. WIT Transactions on the Built Environment, 151, pp. 61–72, 2015. ISSN: 1743-3509, doi: 10.2495/SAFE150061.
http://dx.doi.org/10.2495/SAFE150061
[6] Beard, G.F. & Griffin, M.J., Discomfort caused by low-frequency lateral o scillation, roll oscillation and roll-compensated lateral oscillation. Ergonomics, 56(1), pp. 103–114, 2013. http://dx.doi.org/10.1080/00140139.2012.729613
[7] Fairley, T.E. & Griffin, M.J., The apparent mass of the seated human body: vertical vibration. Journal of Biomechanics, 22, pp. 81–94, 1989. http://dx.doi.org/10.1016/0021-9290(89)90031-6
[8] Paddan, G.S. & Griffin, M.J., A review of the transmission of translational seat vibration to the head. Journal of Sound and Vibration, 215, pp. 863–882, 1998. http://dx.doi.org/10.1006/jsvi.1998.1592
[9] Seidel, H., Bluthner, R., Hinz, B. & Schust, M., On the health risk of the lumbar spine due to whole-body vibration theoretical approach, experimental data and evaluation of whole-body vibration. Journal of Sound and Vibration, 215(4), pp. 723–741, 1998. http://dx.doi.org/10.1006/jsvi.1998.1601
[10] Ishitake, T., Miyazaki, Y., Noguchi, R., Ando, H. & Matoba, T., Evaluation of frequency weighting (iso 2631-1) for acute effects of whole-body vibration on gastric motility.
Journal of Sound and Vibration, 253(1), pp. 31–36, 2002. http://dx.doi.org/10.1006/jsvi.2001.4263
[11] Bovenzia, M., Ruia, F., Negroa, C., D’Agostina, F., Angotzi, G., Ianchi, S., Bramanti, L., Festa, G., Gatti, S., Pinto, I., Rondina, L. & Stacchini, N., An epidemiological study of low back pain in professional drivers. Journal of Sound and Vibration, 298, pp. 514–539, 2006. http://dx.doi.org/10.1016/j.jsv.2006.06.001
[12] Griffin, M.J., A comparison of standardized methods for predicting the hazards of whole-body vibration and repeated shocks. Journal of Sound and Vibration, 215(4), pp.
883–914, 1998.
http://dx.doi.org/10.1006/jsvi.1998.1600
[13] Alfaro Degan, G, Lippiello, D., Lorenzetti, S. & Pinzari, M., Vibration assessing models: comparison between methods. WIT Transactions on Biomedicine and Health, 16, pp. 59–69, 2013. ISSN: 1743-3525, doi: 10.2495/EHR130061. http://dx.doi.org/10.2495/EHR130061
[14] Mansfield, N.J. & Griffin, M.J., Effects of posture and vibration magnitude on apparent mass and pelvis rotation during exposure to whole-body vertical vibration. Journal of Sound and Vibration, 253(1), pp. 93–107, 2002.
http://dx.doi.org/10.1006/jsvi.2001.4251
[15] Nawayseh, N. & Griffin, M.J., Tri-axial forces at the seat and backrest during wholebody vertical vibration. Journal of Sound and Vibration, 277, pp. 309–326, 2004. http://dx.doi.org/10.1016/j.jsv.2003.09.048
[16] Tiemessen, I.J., Hulshof, C.T.J. & Frings-Dresen, M.H.W., An overview of strategies to reduce whole-body vibration exposure on drivers: a systematic review. International Journal of Industrial Ergonomics, 37, pp. 245–256, 2007.
http://dx.doi.org/10.1016/j.ergon.2006.10.021
[17] Khorshid, E., Alkalby, F. & Kamal, H., Measurement of whole-body vibration exposure from speed control humps. Journal of Sound and Vibration, 304, pp. 640–659, 2007. http://dx.doi.org/10.1016/j.jsv.2007.03.013
[18] Gallais, L. & Griffin, M.J., Low back pain in car drivers: a review of studies published 1975 to 2005. Journal of Sound and Vibration, 298, pp. 499–513, 2006. http://dx.doi.org/10.1016/j.jsv.2006.06.012
[19] Scarlett, A.J., Price, J.S. & Stayner, R.M., Whole-body vibration: Evaluation of emission and exposure levels arising from agricultural tractors. Journal of Terramechanics, 44, pp. 65–73, 2007. http://dx.doi.org/10.1016/j.jterra.2006.01.006
[20] Langer, T.H., Ebbesen, M.K. & Kordestani, A., Experimental analysis of o ccupational whole-body vibration exposure of agricultural tractor with large square baler.
International Journal of Industrial Ergonomics, 47, pp. 79–83, 2015. http://dx.doi.org/10.1016/j.ergon.2015.02.009
[21] Cutini, M., Romano, E. & Bisaglia, C., Assessment of the influence of the eccentricity of tires on the whole-body vibration of tractor drivers during transport on asphalt roads.
Journal of Terramechanics, 49, pp. 197–206, 2012.
http://dx.doi.org/10.1016/j.jterra.2012.05.004
[22] Tsujimura, H., Taoda, K. & Kitahara, T., A field study of exposure to whole-body vibration due to agricultural machines in a full-time rice farmer over one year. Journal of Occupational Health, 57, pp. 378–387, 2015.
http://dx.doi.org/10.1539/joh.14-0260-OA
[23] Okunribido, O.O., Shimbles, S.J. & Magnusson, M., City bus driving and low back pain: a study of the exposures to posture demands, manual materials handling and whole-body vibration. Applied Ergonomics, 38, pp. 29–38, 2007. http://dx.doi.org/10.1016/j.apergo.2006.01.006
[24] Rehna, B., Lundstrom, R., Nilsson, L., Liljelind, I. & Jarvholm, B., Variation in e xposure to whole-body vibration for operators of forwarder vehicles-aspects on measurement strategies and prevention. International Journal of Industrial Ergonomics, 35, pp. 831–842, 2005. http://dx.doi.org/10.1016/j.ergon.2005.03.001
[25] Blood, R.P., Rynell, P.W. & Johnson, P.W., Whole-body vibration in heavy equipment operators of a front-end loader: Role of task exposure and tire configuration with and without traction chains. Journal of Safety Research, 43, pp. 357–364, 2012. http://dx.doi.org/10.1016/j.jsr.2012.10.006