PRODUCED LEVEL OF TRACTOR VIBRATIONS DURING OPERATION ON VARIOUS AGRICULTURAL SURFACES THAT AFFECT THE BODY OPERATOR IN REALATION TO THE WORKING HOURS OF TRACOTR

U radu su izneseni rezultati istraživanja i usporedba mjerenja proizvedene razine traktorskih vibracija koje utječu na trup rukovatelja u odnosu na radne sate traktora u 2015. i 2016. godini u skladu s propisanim normama HRN ISO 2631-1 i HRN ISO 2631-4. Mjerenja 2015. i 2016. godine izvedena su na traktoru Landini Powerfarm 100 na pristupnim cestama i proizvodnim površinama Poljoprivredne i veterinarske škole u Osijeku. Mjerenja su izvršena uređajem MMF VM30. Rezultati prikazuju usporedbu mjerenja kroz dvije godine iz kojih je vidljivo da uslijed povećanja radnih sati traktora dolazi i do povećanja razine vibracija koje utječu na trup rukovatelja na svim mjernim podlogama (asfalt, trava i makadam). Najviša razina vibracija 2015. godine izmjerena je na travi, dok je u 2016. godini najviša razina vibracija izmjerena na makadamu. Na asfaltnoj podlozi u obje je godine izmjerena najniža razina vibracija.The thesis presents the results of research and comparison of measurements and produced levels of tractor vibrations that affect the body of the human operator in relation to the working hours of tractors in year 2015. and 2016. in accordance with the prescribed standards ISO 2631-1 and ISO 2631-4 Measurements of the year 2015 and 2016 were carried out on the tractor Landini Powerfarm 100 on access roads and production areas of Agricultural and veterinary school in Osijek. Measurements have been made by MMF VM30 device. The results show the comparison measurement through two years of which shows that due to increased hours of tractor comes up increasing the level of vibration affecting the body of human operator at all measuring surfaces ( asphalt , grass and gravel) . The highest level of vibration in the year 2015. wasmeasured on the grass, while in year 2016 the highest vibration levels are measured on the gravel road. The lowest vibrations level were measured on asphalt in both years