Krutova V.A., Zavyalov D.S.
UDK 614.872.4
https://doi.org/10.56408/2412-8627.2026.1.12.005
Krutova, V.A. Studying the Acoustic Characteristics at the Combine Harvester's Discharge Area / V.A. Krutova, D.S. Zavyalov // Noise Theory and Practice. – 2026. – Vol. 12, No. 1 (44). – P. 47-56. – DOI: 10.56408/2412-8627.2026.1.12.005
noise levels, combine harvester, acoustic characteristics, agriculture, sound pressure level
The aim of this work is an experimental study of the acoustic characteristics (noise levels) at the exit area of a forage harvester under various operating modes. The research methods included field measurements of sound pressure levels and equivalent sound levels using certified sound level meters and spectrum analyzers. Measurements were carried out for different configurations of the operating equipment: engine only, engine with individual units (threshing drum, fan, rotors), and with all technological units operating simultaneously. The obtained data were compared with the requirements of sanitary standards (GOST, SanPiN). The main results showed that with only the engine running, the equivalent noise level exceeds the standard (80 dBA) by 5.9 dBA, reaching 85.9 dBA. When all working parts were engaged, a maximum exceedance of 15.4 dBA was recorded (the noise level was 95.4 dBA). The most significant exceedances are observed in the mid- and high-frequency ranges (125–8000 Hz). The forage harvester is an intensive source of noise, creating a significant exceedance of permissible levels at the exit area, which confirms the need to improve machine designs and apply additional noise protection measures to ensure the safety of operators and personnel.
Krutova V.A.
Baltic State Technical University "VOENMEH", Saint Petersburg, Russia
Zavyalov D.S.
Baltic State Technical University "VOENMEH", Saint Petersburg, Russia
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