TY - JOUR T1 - Effect of Driver Mass on His Health and Comfort, and Permissible Riding Hours/Day in Three Commonly Used Tractors in Iran TT - تأثیر جرم راننده بر سلامتی و آسایش او و مدت زمان مجاز رانندگی در سه نوع تراکتور متداول در ایران JF - JSTNAR JO - JSTNAR VL - 12 IS - 44 UR - http://jstnar.iut.ac.ir/article-1-880-en.html Y1 - 2008 SP - 213 EP - 221 KW - Tractor KW - Vibration KW - Driver weight KW - Health KW - Comfort. N2 - Occupational safety and health of agricultural workers have not yet received their due attention in developing countries. This is particularly true in the case of tractor drivers who operate tractors in unfavorable conditions and in a high level of seat and tractor vibrations. Therefore, an investigation of vibration sources and finding the methods for decreasing them are of considerable importance. In this research, vibrations that the tractor operators of different weights are exposed to while operating any of the three commonly used tractors in Iran during plowing with moldboard plows, disk harrows or routine road travel at two forward speeds were examined. Acceleration data of tractor body and its driver, while riding the tractor, were measured and recorded. Later, Fast Fourier Analysis, and root mean square of weighted accelerations for the cases of driver health and comfort were analyzed and evaluated. Results revealed that the level of forward speed did not have any significant effect on vibrations introduced to drivers body, however, the average of acceleration vectors on different tractors and their drivers’ bodies revealed a significant influence (P M3 ER -