Este estudo foi realizado na região de Bituruna-PR, em povoamentos de Pinus taeda com 10 anos de idade submetidos ao primeiro desbaste, objetivando quantificar os níveis de vibração a que estão expostos os operadores de dois tipos de harvesters (esteiras e pneus) durante a jornada de trabalho.
Utilizou-se um medidor integrador triaxial Bruel & Kjaer modelo Type 4447 e os resultados analisados conforme os critérios estabelecidos pela NHO 09.
O harvester de esteiras apresentou resultados de aren e VDVR equivalentes a 0,6 m/s² e 11,2 m/s1,75 respectivamente, enquanto o harvester de pneus apresentou valores médios de 0,4 m/s² e 9,3 m/s1,75.
Os resultados indicaram diferenças significativas pelo teste t (p<0,05), indicando, portanto, melhores condições de trabalho no posto de trabalho do harvester de pneus.
Apesar da significativa modernização empregada em máquinas de colheita florestal até os dias atuais, observa-se que a exposição ocupacional à vibração ainda é um fator ergonômico que pode comprometer o conforto, a saúde e a segurança de operadores dessas máquinas e, quando comparadas máquinas purpose built com máquinas adaptadas, os riscos à saúde são ainda maiores.
In Brazil, there are few studies related to occupational exposure to full body vibration in forestry machine workstations and, when considered thinning operations, there are no related studies.
COMPARATIVE ANALYSIS OF THE OCCUPATIONAL EXPOSURE TO HARVESTER VIBRATION (TRACKED AND WHEELED) IN PINUS THINNING
In Brazil, there are few studies related to occupational exposure to full body vibration in forestry machine workstations and, when considered thinning operations, there are no related studies.
This study was carried out in the region of Bituruna-Pr, in 10-year-old Pinus taeda stands subjected to the first thinning, aiming to quantify the vibration levels to which operators of two types of harvester - treadmills and tires - are exposed during the working day.
A Bruel and kjaer type 4447 triaxial integrator meter was used and the results were analyzed according to the criteria established by NHO 09.
The track harvester presented results of aren and VDVR equivalent to 0.6 m/s² and 11.2 m/s1.75 respectively, while the tire harvester presented mean values of 0.4 m/s² and 9.3 m/s1.75.
The results indicated significant differences by the t test (p<0.05), indicating, therefore, better working conditions at the tire harvester workstation.
Despite the significant modernization used in forest harvesting machines to the present day, it is observed that occupational exposure to vibration is still an ergonomic factor that can compromise the comfort, health and safety of operators of these machines and, when compared machines purpose built with machines, health risks are even greater.
Keywords: Vibration. Harvester. Thinning.
Autores: Alysson Braun Martins e Felipe Martins de Oliveira.
Artigo completo: https://online.unisc.br/seer/index.php/tecnologica/article/view/13466
Autores: Alysson Braun Martins e Felipe Martins de Oliveira.
Artigo completo: https://online.unisc.br/seer/index.php/tecnologica/article/view/13466
