Análise do nível de vibrações nos assentos de tratores agrícolas

Detalhes bibliográficos
Ano de defesa: 2007
Autor(a) principal: Franchini, Danilo
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Santa Maria
BR
Engenharia Agrícola
UFSM
Programa de Pós-Graduação em Engenharia Agrícola
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://repositorio.ufsm.br/handle/1/7590
Resumo: Nowadays, whole-body vibration is widely recognized as risk factor for worker all around the world. Most of published works on this subject was developed in main research centers. The aims of this study were (1) to determine the vertical whole-body vibration levels on the tractor seat, (2) to determine the combination influence between three tire inflation pressures and two travel speed in the whole-body vibration, (3) to characterize the vertical whole-body vibration high level in one-third-octave band, (4) to determine the transmissibility between the seat and the seat support, (5) to compare the values with ISO 2631 (1997) Standard. A vertical whole-body vibration levels field measurement was accomplished with a 65 kW tractor and a seeder-fertilizer. Three tire inflation pressures P1 = 179 kPa, P2 = 138 kPa and P3 = 96 kPa and two travel speed V1 = 4,5 km/h and V2 = 7 km/h were used in this study. The results revealed that (1) the lowest acceleration weighting was 0,68 m/s² (P1 x V1) and de highest acceleration weighting was 3,32 m/s² to (P1 x V2), (2) the whole-body vibrations, the travel speed, the tire inflation pressure and it s interaction have influenced on the vertical whole-body vibration, (3) the vertical whole-body vibration high level in one-third-octave band was 4 at 8 Hz by combination (P1, P2 and P3) with (V2), excepted for (P2 x V2) by 5 Hz, (4) the lowest SEAT% weighting by combination (V1) with (P1) and (P2), (5) the pressure and speed combination resulted in whole-body vibrations levels which characterize the operator seat from fairly uncomfortable to extremely uncomfortable. The best scenario was (P1 x V1), because the tractor operator was submitted to acceptable vertical whole-body vibration levels.