sound quantity and quality of sampo 3065 combine harvester

abstract- noise is considered as one of the most debilitating conditions in farming operations. in this study, a number of factors affecting the noise generated by sampo 3065 combine harvesters were evaluated. factors were engine speed and gear ratio for combines with and without original cabins. a factorial experiment arranged as a completely randomized design with four replicates was used. results indicated that loudness level correlated strongly with a-weighted sound pressure level (r2=0.99) but had a weak relationship with linear sound pressure level (r2 = 0.60). other results showed that original cabins decreased 30.5, 22.8 and 5.4 percent of the loudness level, a-weighted and linear sound pressure levels, respectively. mean value averages for loudness level, a-weighted and linear sound pressure levels for high engine speed were 6.9, 9.1 and 11.1 percent higher than those at low engine speed.