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Butkus, R., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania) | Vasiliauskas, G., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania)

Results of various studies show that the most prevailing risk factors on workers of agricultural sector are noise and vibration. These hazards are especially important in transportation and most field works. Results from previous studies show that vibro-acoustic environment in tractors operated in Lithuania usually cannot be attributed as acceptable, but technical solutions implemented by manufacturers had definitely positive influence on working conditions. Noise level reduced from 90 dB(A) (tractors of 1980 – 1990 years of manufacture) to 73 dB(A) (tractors manufactured from year 2000). As renewal of tractors is not sufficient, there is still a large number of old machinery i.e. noise levels might be as high as 92 dB(A) which allows to work safely only one hour per day without personal protection. It was found that values of whole body vibration (WBV) during ploughing operation might be as high as 1.5 m∙sE-2 which excess the vibration limit value of 1.15 m•sE-2, while hand-arm vibration (HAV) did not exceed the vibration action value of 2.5 m•sE-2. Significant effect of tyre pressure was noticed on vibration values measured on driver’s seat. Vibration acceleration values may be reduced to safe 0.5 m•s-2 by selecting appropriate tyre pressure.

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