Investigation and Analysis of Driver Weight on His Health and Comfort in Three Commonly Used Tractors in Iran

A. Maleki, S. S. Mohtasebi, A. Akram, V. Esfahanian

Abstract


Occupational safety and health of agricultural workers has not yet received its 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 some methods for decreasing them are of
considerable importance. In this research work, vibrations that the tractor operators of
different weights, are exposed to, were examined during the operation of three commonly
used tractors in Iran, which are plowing with moldboard plows, disk harrows or routine road
travel, at different forward speeds. Acceleration data of tractor body and its driver, while
riding the tractor, were measured and recorded. Following, Fast Fourier Analysis, root mean
square of weighted accelerations for the case of driver health and comfort were analyzed and
evaluated. Results revealed that levels of forward speed did not have any significant effect on
vibrations introduced to drivers body, however, the average of acceleration vectors of
different tractors and their drivers bodies revealed a significant influence(p<0.01). Moreover,
with increasing a driver’s weight, the average of acceleration vectors on his body was
decreased. In a comparison of permissible riding hours/day, JD3140 and U651 tractors scored
maximum and minimum values, respectively. Also a comparison of acceleration vectors for
different tractor operators, when compared with international standards, showed that the
comfort level for these tractors was extremely low.

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