Motion speed and agrotechnical operation as noise -generating factors affecting the operator of an agricultural tractor

U radu su prikazani rezultati mjerenja razine buke s obzirom na različite brzine gibanja te agrotehničke operacije. Istraživanje je obavljeno na traktoru ˝IMT 539˝ koji je bio agregatiran slijedećim priključcima: malčer Gramip GS 45-160, raspršivač Agromehanika te bočna freza. Razina buke mjerena je pomoću uređaja Metrel tipa Multinorm MI 6201 EU i zvučnom sondom za mjerenje razine buke istog proizvođača. Buka je mjerena unutar kabine, sa lijeve i desne strane rukovatelja poljoprivrednim traktorom. Cilj istraživanja bio je utvrditi razinu buke koja utječe na rukovatelja traktora. Pretpostavka kako će se s povećanjem brzine povećavati razina buke nije se potvrdila u potpunosti za sve ispitivane strojeve odnosno agrotehničke operacije. Najvišu buku od sva tri ispitivana stroja proizvela je bočna freza, zatim slijedi malčer, a najniža razina buke izmjerena je pri radu raspršivača. Utvrđeno je kako su pri svim agrotehničkim operacijama izmjerene razine buke prelazile graničnu vrijednost izloženosti buci. Prema tome proizlazi zaključak kako je rukovatelj traktora izložen razini buke koja je opasna za zdravlje te kako ista može ostaviti niz negativnih zdravstvenih posljedica.This thesis presents the result of measurement of the noise level regard to different speeds of motion and different agrotechnical operation. The measurements were done on the tractor ˝IMT 539˝ by using mulcher Gramip GS 45-160, sprayer Agromehanika and lateral rotary tilling machine. Noise level was measured by noise measuring device Metrel type Multinorm MI 6201 EU and sound level probe from the same manufacturer inside of the tractor cabin from the left and right side of the tractor operator. The aim of the research was to determine the noise level which affect the tractor operator. The assumption that increasement of the speed motion will increase the noise level is not fully confirmed for all examined machines or agrotechnical operations. The highest noise level of all three tested machines was produced by the lateral rotary tilling machine, then mulcher and the lowest noise level was produced by sprayer. It was found that noise levels measured at all agronomic operations exceeded the noise exposure limit value. The conclusion is that the tractor operator is exposed to a noise level that is dangerous for health and can leave several negative health consequences