Operators of agricultural tractor perform various tasks at work that expose them to a variety of risk factors. During their work, agricultural tractor operators are exposed to different negative influences, due to which vibrations are especially harmful. Long term exposure of tractor driver to vibrations induced by agricultural tractor operations may lead to various health problems. It is widely recognised that agricultural tractor operators are exposed to high level of whole body vibration (WBV) during specific farm operations. WBV may leads to Low back Pain (LBP) and spinal cord related diseases, therefore the objective of the study is to reduce the level of ride vibrations experienced by tractor seats appear to be necessary and some possible methods of achieving significant improvements. In the present study, The vibration transmitted through the seat of a four-wheel drive tractor equipped with front suspension axle and shock absorber for the implement, were measured using OR34-2, 4 Channel FFT analyser and then analysed in terms of root mean square (RMS) accelerations according to the ISO standard. Several tests were conducted in different conditions considering the type of operation (harrowing, ploughing and cultivating) at different road conditions (on road, sugarcane field and flat field) with two different running speeds. Then we developed a new suspension system for tractors seat using spring and dampers to reduce the vibration energy and frequencies up to a suitable range for the operator. The vehicle dynamics model of tractor with tandem suspension is modelled and simulated in analysis software ANSYS and optimize the parameters of the seat to achieve rms acceleration in the range of ‘Health guidance caution zone’ (HGCZ) so that it gives the ride comfort for the operator.
Vibration, Low Back Pain, RMS Acceleration, Tractor Seat, Suspension System, Springs, Damper, Frequency, etc
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