|
چکیده
|
Whole body vibration is one of the main causes of musculoskeletal disorders of drivers. The purpose of this study was to investigate the allowable exposer time, care limit, and driver response to the vibrations of the seat of tractor. A three-way accelerometer was used to measure the vibration of the seat of a four-wheel drive ITM 475 Tractor based on the ISO 2631-1 international vibration standard. The studied factors were evaluated engine rotational speed, gear ratio, and road. The obtained data were analyzed through a factorial experiment based on completely randomized design. The results showed that effects of the main factors and those of their interactions on the total vibration emitted from the tractor seat were significant at 1% probability level. The minimum allowable exposure time and care limit were 1.16 and 0.14 h, respectively, that was in very uncomfortable range. The effect of engine rotational speed on the driver allowable exposure time to vibration is more than that of shifting gear. The results of the present study are useful to reduce whole body vibration and increase exposer time of the tractor driver through adjusting suitable driving conditions.
|