Vibrations and noise at the driver’s seat of city buses. Part III: the problem of speed bumps
DOI:
https://doi.org/10.36125/ijoehy.v5i2.97Keywords:
Bus, vibrations, speed bumpsAbstract
In urban areas, the speed bumps are widely used to reduce the speed of vehicles. These devices cause widespread complaints,
especially by the side of bus drivers. Six buses were considered in simulated working conditions on 31 bumps
of a line from terminal to terminal; the same procedure was used for 15 buses in real working conditions on a total of
15 lines characterized by 328 bumps. The vertical frequency-weighted accelerations measured on the bumps are higher
than those without bumps; however, due to the limited duration of the effects produced by bumps, they slightly affect
accelerations on the entire line. Furthermore, the vibrations on the bumps do not exhibit impulsive characteristics due
to the low speed used to surmount over bumps. On the contrary, vibrations with impulsive characteristics are determined
when potholes and dips along the way are passed through at high speed.
References
Delucis, C., Urcioli, G., Battistoni, M., Di Pede, C., Orzalesi, V., Menocci, C., Pantanella, L., Vincentini, M., 2009. Misure di vibrazioni trasmesse al sistema corpo intero dagli autobus di linea in tratti urbani ed extraurbani. Atti 27° Convegno Nazionale AIDII, Verona 24 - 26/6/2009.
ISO 10326-1. Mechanical vibration - Laboratory method for evaluating vehicle seat vibration - Part 1: Basic requirements. International Organization for Standardization, 1992.
ISO 2631-1. Mechanical vibration and shock - Evaluation of human exposure to whole-body vibration - Part 1: General requirements. International Organization for Standardization, 1997.
Lewis, C.A., Johnson, P.W., 2012. Whole-body vibration exposure in metropolitan bus drivers. Occup. Med., 62, 519 - 524.
Munjin, M.A., Zamorano, J.J., Marré, B., Ilabaca, F., Ballesteros, V., MartÃnez, C., Yurac, R., Urzúa, A., Lecaros, M., Fleiderman, J., GarcÃa, N., 2011. Speed hump spine fractures: injury mechanism and case series. Spinal Disord. Tech., 24 (6), 386 - 389.
Paddan, G.S., Griffin, M.J., 1998. A review of the transmission of the translational seat vibration to the head. J. Sound Vibration, 215 (4), 863 - 882.
