THE EFFECT OF AGROTECHNICAL SUBSTANCES AND MATERIALS OF THE SEATS ON THE PRODUCED VIBRATION LEVEL THROUGH THE BODY OF OPERATER

U radu su prikazane izmjerene vibracije prilikom kretanja vozila na tri agrotehničke podloge (asfalt, lucerna, poljski put), na sedam različitih materijala zbog vibracija koje utječu na trup rukovatelja. Ispitivanje je obavljeno prema normama HRN ISO 2631 – 1 i HRN ISO 2631 – 4. Mjerenje je obavljeno na traktoru IMT 558. Ispitivanje je trajalo 30 minuta te je ponovljeno tri puta za svaki materijal sjedalice. Mjerenje je obavljeno u eksploatacijskom radu. Ispitivanja su obavljanja pomoću uređaja MMF VM30. Iz rada je vidljivo kako je razina vibracija različita, ovisno o podlozi i materijalu sjedalice. Najmanje vibracije proizvodi agrotehnička podloga asfalt, a najbolji materijal je memorijska pjena i spužvaThe work shows the measured vibrations when moving the vehicle to three agrotechnical substrates (asphalt, alfalfa, pole path), in seven different materials due to vibrations affecting the body of the operator. The test was performed according to HRN ISO 2631-1 and HRN ISO 2631-4. The measurement was performed on the IMT 558 tractor. The test lasted for 30 minutes and was repeated three times for each seat material. The measurement was performed in exploitation work. The tests are performed using the MMF VM30. From the work it is apparent that the vibration level is different, depending on the underbody and seat material. The least vibration produces agrotechnical substrate asphalt, and the best material is a memory foam and a sponge