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Título: Characterization of noise emitted by a power tiller through geostatistics
Título(s) alternativo(s): Caracterização do ruído emitido por um trator de rabiça por meio da geoestatística
Palavras-chave: Acoustic comfort
Agricultural mechanization
Spatial variability
Sine wave model
Máquinas agrícolas - Ruídos
Conforto acústico
Mecanização agrícola
Variabilidade espacial
Modelo de onda senoidal
Agricultural machinery - Noises
Data do documento: 2019
Editor: Departamento de Engenharia Agrícola - UFCG
Citação: GONÇALVES, L. M. et al. Characterization of noise emitted by a power tiller through geostatistics. Revista Brasileira de Engenharia Agrícola e Ambiental, Campina Grande, v. 23, n. 3, p. 223-228, 2019.
Resumo: Noise is one of the harmful and stressful physical agents present in the workplace. Research performed with geostatistics to adjust the semivariogram of tractor noise were performed using the Gaussian and spherical model. In this way, the aim was to map the spatial variability of the noise emitted by a power tiller through the sine wave model, besides testing other fitting methods, in order to identify health zones for the workers. The experiment was performed with an agricultural power tiller (10.3 kW) placed in a working regime (1500 rpm), coupled to a brushcutter, and a digital sound level meter to collect noises in points distributed along a regular grid sampling of 2.0 × 2.0 m around the tractor. The spatial dependence of noise was analyzed through semivariogram fitting by different methods and by the wave model to obtain the spatial distribution map interpolated by kriging. It was possible to characterize the structure and the magnitude of the spatial dependence of the noise levels emitted by the tractor, as well as to map the spatial distribution. A maximum noise level of 96.5 dB was observed close to the tractor engine, a value above the limit of 85.0 dB for 8 h of daily exposure (NR-15). Thus, the use of ear protectors is recommended for both the tractor driver and the professionals who support agricultural operation within a radius of 6 m from the emitting source under the conditions studied.
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