Abstract
The study in the present paper was carried out when a fabricated cab was added to an agricultural tractor. The fabricated cab was selected after a comprehensive series of experimental tests carried out on a variety of cab constructions. The noise measurements were taken from the experimental tests, while the tractor was driven either by the chassis dynamometer in the laboratory or on a farm road surface. The results are discussed from the view point of obtaining the influence of the tractor driving parameters (road speed, gear-shift, engine speed and tractive effort) on the noise measured inside the tractor cab at the operator's head position in terms of sound pressure level and analysed over the frequency range up to 2000 Hz. In addition, rubber pads were used between the fabricated cab and the tractor floor to control noise. The results indicate that the tractor driving parameters affect the noise measured within the tractor cab. Moreover, the road surface roughness or the type of farm surface also produced a significant effect on the measured interior noise.