DISTRIBUTION AND SPECTRUM ANALYSIS OF NOISE ON A COMBINE HARVESTER

It is important to comprehend the characteristics of the noise occurri ng from combine harvesters in order to reduce the noise. In this study , estimation of noise at the operator's head, the measurement of noise distribution, and the spectrum analysis of noise at the operator's he ad were performed. As a result, at the operator's head, A-weighted sou nd pressure level was 87dB(A) in the time domain, and A-weighted sound pressure levels at 160Hz and 330Hz were 72dB(A) and 71dB(A) in the fr equency domain. So the operator feels uncomfortable in this working en vironment. It was found through the measurement of noise distribution that many noise sources and forms of parts constituting a combine harv ester characterized the distribution and levels of the noise occurring from a, stationary combine harvester. It was found through the spectr um analysis of the noise at the operator's head that the engine exhaus t would characterize the frequencies of the spectrum peaks of the nois e at the operator's head.