Sound Quantity and Quality of Sampo ۳۰۶۵ 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 ۳۰۶۵ 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 (R۲=۰.۹۹) but had a weak relationship with linear sound pressure level (R۲ = ۰.۶۰). Other results showed that original cabins decreased ۳۰.۵, ۲۲.۸ and ۵.۴ 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 ۶.۹, ۹.۱ and ۱۱.۱ percent higher than those at low engine speed.

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Keywords: Combine Harvester ، Loudness Level and Sound Pressure Level ، Noise