نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد،
2 دانشیار گروه مهندسی مکانیک بیوسیستم دانشگاه شهرکرد، شهرکرد، ایران
3 گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد ، ایران،
4 دانشیار گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه اراک، ارک، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Noise pollution in agricultural machinery, particularly grain harvest combines, not only causes quantitative adverse effects but also leads to significant psychoacoustic impacts on operators. Although most previous studies have primarily focused on evaluating sound pressure levels, limited attention has been paid to qualitative psychoacoustic parameters such as loudness, sharpness, and roughness in combine harvesters. Therefore, the present study aimed to perform a psychoacoustic analysis of acoustic signals generated by two grain combine harvester models, namely John Deere and Sampo, under different operating conditions, while simultaneously evaluating both quantitative and qualitative sound characteristics. In this study, acoustic signals were recorded under various operational conditions including idle speed, high engine speed, free movement, and harvesting operation. The recorded signals were then analyzed using signal processing techniques to extract quantitative sound indices, including sound pressure level, as well as psychoacoustic parameters such as loudness, sharpness, and roughness. The results demonstrated that operating conditions, engine speed, and operational mode significantly affected the acoustic characteristics of the combines. The average loudness values of the Sampo and John Deere combines at idle and high engine speeds were 7.1 and 12.95 sone, and 8.6 and 17.57 sone, respectively. Furthermore, the average sound pressure levels for the Sampo and John Deere combines were measured as 54.1 and 59.6 dB, and 54.7 and 65.0 dB, respectively. The highest roughness values for both combines were observed during harvesting operations, whereas the lowest values occurred during free movement conditions.
کلیدواژهها [English]
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