Assessment of exposure to whole-body vibration of forklift trucks (Contributo in atti di convegno)

Type
Label
  • Assessment of exposure to whole-body vibration of forklift trucks (Contributo in atti di convegno) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Alternative label
  • Peretti Alessandro; Bonomini Francesco; Pedrielli Francesca; Pasqua di Bisceglie Anita (2010)
    Assessment of exposure to whole-body vibration of forklift trucks
    in 8th International Scientific Conference IOHA2010, Roma, 28.09.2010-02.10.2010
    (literal)
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  • Peretti Alessandro; Bonomini Francesco; Pedrielli Francesca; Pasqua di Bisceglie Anita (literal)
Pagina inizio
  • 224 (literal)
Pagina fine
  • 225 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 2 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Post-Graduation School in Occupational Medicine, University of Padua; CNR-Imamoter Institute, National Research Council of Italy, Ferrara; Department of Environmental Medicine, University of Padua; Peretti e associati srl, Padova (literal)
Titolo
  • Assessment of exposure to whole-body vibration of forklift trucks (literal)
Abstract
  • In plants and warehouses forklift trucks have become indispensable to lift and transport materials and goods. Very often, operators of these self-propelled machines do the same job for the whole shift. They are therefore continuously exposed to whole-body vibration. All data were collected in 13 different firms and refer to 120 forklift trucks: 90 trucks of the most diffused type (counterbalanced trucks) and 30 trucks of different typologies (order picking trucks, reach trucks, stackers trucks, pallet trucks, towing tractors); 106 trucks have a seat for the operator while 14 trucks have a standing platform for the operator. All the forklift trucks involved in this study were tested during normal activities for about 10 minutes. Vibration measurements were made using two tri-axial accelerometers. For the measurements made at the operator seat, one accelerometer was mounted in a semi-rigid disc positioned on the seat surface, while the other accelerometer was rigidly fixed at the seat base by means of a magnet. For the measurements made at the platform, both the accelerometers were mounted on it by means of magnets. The transducers were connected to an 8-channel measurement system equipped with built-in digital weighting filters as defined in ISO 8041. For both measurement positions, the frequency-weighted acceleration values for each of the three axes have been evaluated. Then, multiplying these root mean square values of acceleration by 1.4, for the x- and y-directions, and by 1, for the z-direction, the quantities allowing the risk assessment for vibration exposure were obtained. Furthermore, the ratio between the vertical vibration measured at the seat and that measured at its base, called SEAT (Seat Effective Amplitude Transmissibility), was evaluated. Vibration exposure is influenced by many different aspects, especially travelling speed and terrain conditions. Results indicated that the acceleration values, allowing the risk assessment for vibration exposure, range from 0.24 and 1.28 m/s2. Referring to daily exposure action value (0.5 m/s2) and limit value (1.15 m/s2) as defined by Directive 2002/44/EC, worker exposure for a hypothetic 8-hour working shift is: - lower than 0.5 m/s2 for 54% of trucks; - between 0.5 and 1.15 m/s2 for 45% of trucks; - higher than 1.15 m/s2 for 1% of trucks. In the hypothesis of a 6-4 hour working shift, the operator exposure is: - lower than 0.5 m/s2 for 68-86% of trucks; - between 0.5 and 1.15 m/s2 for 32-14% of trucks. The axis mainly responsible for the risk is generally the vertical direction (68%); less influence arises from longitudinal (27%) and transversal (5%) directions. Operator seats provide attenuation to vibration to a certain extent in 70% of cases. An amplification of vibration also occurred in 30% of cases. In conclusion, vibrations emitted by forklift trucks may constitute a risk for operators, in certain working conditions. (literal)
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