Avaliação do nível de ruído em colhedoras combinadas

Silva, Rouverson Pereira da; Fontana, Gustavo; Lopes, Afonso; Furlani, Carlos Eduardo Angeli

doi:10.1590/s0100-69162004000200017

“…Above this threshold, the noise, in addition to disturbing human activities, may cause serious health damage (SILVA et al, 2004). Fernandes (1991) analyzed noise sources from agricultural tractors and concluded that the main cause of the noise is the engine, particularly the exhaust system.…”

Section: Introductionmentioning

confidence: 99%

Assessment of noise level emitted by micro tractor in static and dynamic conditions

Nascimento

¹

,

Viliotti

²

,

Mion

³

et al. 2013

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Noise is a complex mixture of sounds that causes the feeling of discomfort and is continuously present in the daily lives of human beings. The objective of this study is to assess the noise level emitted by a micro tractor in various situations. In the first situation, the micro tractor is standing still and is subjected to 600, 800, and 1100 rpm from four positions -right, front, left, and rear sides -as well as four distance radii -1, 2, 5, and 10 m. In the second situation, the micro tractor is in motion and is subjected to three operational gears (1st, 2nd, and 3rd) at 1100 rpm with two types of soil surfaces -hard and mobilized. The results reveal that noise levels increase with an increase in the number of engine rotations and they decrease with an increase in the distance radius; this can be observed in all three situations considered in the assessment. Further, it is verified that there is no difference between surfaces in terms of the noise level, and the average value for the hard soil and mobilized soil is 89.5 dB(A) and 91.7 dB(A), respectively. However, for both surfaces, the values are above the threshold of 85 dB(A) for an eighthour work shift. Key words: Noise level, ergonomics, machines ResumoO ruído é um complexo de sons que causam sensação de desconforto e está presente de forma contínua na vida diária dos seres humanos. Objetivou-se com este trabalho avaliar o nível de ruído emitido por um microtrator sob diferentes situações: a primeira com o microtrator parado submetido às rotações de 600, 800 e 1.100 rpm em quatro posições em relação ao microtrator: lados direito, frontal, esquerdo e traseiro e quatro raios de afastamento: 1, 2, 5 e 10 m e a segunda com o microtrator em movimento submetido a três marchas de trabalho (1ª, 2ª e 3ª) a uma rotação de 1.100 rpm em duas superfícies de solo (firme e mobilizado). Os resultados mostraram que o nível de ruído aumenta com um incremento da rotação do motor e diminui à medida que o raio de afastamento aumenta, isso pode ser observado para as três rotações avaliadas. Verificou-se que não há diferenças entre as superfícies, para o nível de ruído, sendo o valor médio para o solo firme de 89,5 dB(A) e de 91,2 dB(A) para o solo mobilizado, mas em ambas as superfícies, os valores estão acima do limite de 85 dB(A) para uma jornada de oito horas. Palavras-chave: Nível de ruído, ergonomia, máquinas

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“…The Regulatory Standard (NR-15) regarding unhealthy operations and activities, established by Ordinance 3.214/78 of the Department of Labor and Employment (MTbE), states that the maximum noise level allowed for a daily exposure of eight hours is 85 dB(A) (BRASIL, 2011). Above this threshold, the noise, in addition to disturbing human activities, may cause serious health damage (SILVA et al, 2004). Fernandes (1991) analyzed noise sources from agricultural tractors and concluded that the main cause of the noise is the engine, particularly the exhaust system.…”

Section: Introductionmentioning

confidence: 99%

Assessment of noise level emitted by micro tractor in static and dynamic conditions

Nascimento

¹

,

Viliotti

²

,

Mion

³

et al. 2013

Sem. Ci. Agr.

0

View full text Add to dashboard Cite

Noise is a complex mixture of sounds that causes the feeling of discomfort and is continuously present in the daily lives of human beings. The objective of this study is to assess the noise level emitted by a micro tractor in various situations. In the first situation, the micro tractor is standing still and is subjected to 600, 800, and 1100 rpm from four positions -right, front, left, and rear sides -as well as four distance radii -1, 2, 5, and 10 m. In the second situation, the micro tractor is in motion and is subjected to three operational gears (1st, 2nd, and 3rd) at 1100 rpm with two types of soil surfaces -hard and mobilized. The results reveal that noise levels increase with an increase in the number of engine rotations and they decrease with an increase in the distance radius; this can be observed in all three situations considered in the assessment. Further, it is verified that there is no difference between surfaces in terms of the noise level, and the average value for the hard soil and mobilized soil is 89.5 dB(A) and 91.7 dB(A), respectively. However, for both surfaces, the values are above the threshold of 85 dB(A) for an eighthour work shift. Key words: Noise level, ergonomics, machines ResumoO ruído é um complexo de sons que causam sensação de desconforto e está presente de forma contínua na vida diária dos seres humanos. Objetivou-se com este trabalho avaliar o nível de ruído emitido por um microtrator sob diferentes situações: a primeira com o microtrator parado submetido às rotações de 600, 800 e 1.100 rpm em quatro posições em relação ao microtrator: lados direito, frontal, esquerdo e traseiro e quatro raios de afastamento: 1, 2, 5 e 10 m e a segunda com o microtrator em movimento submetido a três marchas de trabalho (1ª, 2ª e 3ª) a uma rotação de 1.100 rpm em duas superfícies de solo (firme e mobilizado). Os resultados mostraram que o nível de ruído aumenta com um incremento da rotação do motor e diminui à medida que o raio de afastamento aumenta, isso pode ser observado para as três rotações avaliadas. Verificou-se que não há diferenças entre as superfícies, para o nível de ruído, sendo o valor médio para o solo firme de 89,5 dB(A) e de 91,2 dB(A) para o solo mobilizado, mas em ambas as superfícies, os valores estão acima do limite de 85 dB(A) para uma jornada de oito horas. Palavras-chave: Nível de ruído, ergonomia, máquinas

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Qualidade da colheita mecanizada de feijão (Phaseolus vulgaris) em dois sistemas de preparo do solo

Silva¹,

Cassia²,

Voltarelli³

et al. 2013

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Palavras-chave:Controle estatístico de processo (CEP). Desempenho operacional. Perdas na colheita. Recolhedoratrilhadora.ABSTRACT -Among the production stages of the bean plant, harvesting is one of the most important, because it can decisively affect both quality and production costs. Thus, the objective was to assess quality in the mechanized harvesting of beans (Phaseolus vulgaris), grown under conventional tillage and no-tillage systems. The variables analysed were: the noise level emitted, calculated using a sound-pressure meter; the operational performance, by monitoring fuel consumption, wheel-slippage, and displacement velocity of the machine, all collected digitally (datalogger); and the harvesting operation with regard to the dry matter and density of stubble, and to crop losses. The speed and the hourly and operational fuel consumption showed normal data distribution, while the noise level showed a skewed distribution. Losses in the mechanical harvesting of the beans, and stubble density, showed low variability and normal distribution. Therefore, only the hourly consumption and production of stubble dry-matter, showed unstable behavior in relation to the statistical process control, while the other indicators showed it possible to maintain quality in the harvesting operation under both conventional tillage and no-tillage systems.

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Avaliação do nível de ruído em colhedoras combinadas

Cited by 4 publications

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Assessment of noise level emitted by micro tractor in static and dynamic conditions

Assessment of noise level emitted by micro tractor in static and dynamic conditions

Assessment of noise level emitted by micro tractor in static and dynamic conditions

Qualidade da colheita mecanizada de feijão (Phaseolus vulgaris) em dois sistemas de preparo do solo

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