Summary According to a survey published by the Brazilian National Transportation Confederation, recently, the Brazilian truck fleet has been increasing about 84.3%, accounting to, in 2016, a total value of 2 684 227 vehicles. Despite this growth, the quality of the road network did not increase proportionally to the necessary infrastructure for agricultural production flow. This work aims to infer, by the analysis of occupational exposure, the vibration levels acting on truck drivers, analyzing the vibrational degree for health risk and comfort levels. The whole‐body vibration (WBV) in trucks of different models and capacities, at some speeds and pavement types, are evaluated using a portable vibration analyzer with triaxial accelerometers. The daily exposure to vibration A(8) is evaluated and compared with the occupational exposure limits defined by a National Regulation Standard, with measurement procedures defined by an Occupational Hygiene Standard, and level requirements defined by an International ISO Standard. It is concluded that the degree of comfort is higher for heavier vehicles with large wheelbase. Relative to the health risk conditions, the study arrives at the same conclusion; the degree of risk increases as the vehicle' speed and pavement's longitudinal irregularity increase. Regarding human exposure to vibration, the vehicles in their actual working situations presented a vibration scenario where the exposure limits are exceeded, resulting in unhealthy working conditions.
Urban trains and subways are a Brazilian reality. One major aspect that is delegated to a second plan, concerns the quality transportation referred to availability, capacity and safety. Lately, vibration and noise produced by this means of transport have been affecting the life quality in neighborhoods as well as their users. In this paper, the whole body vibration levels in urban trains in Porto Alegre (Trensurb) are evaluated in some situations. Regarding the vibration and rms acceleration doses, the measured values were very low for the back, seat and floor in the vehicle which resulted below the action limit 0.5 m/s² thus, far from the exposure limit 1.1 m/s2 for an 8h exposure time. Generally speaking, the measured vibration levels are considered comfortable, according to values defined in standards, however in some positions and situation, they can be considered uncomfortable. Os trens urbanos e metrôs são uma realidade brasileira. Um aspecto importante que é delegado a um segundo plano, diz respeito à qualidade do transporte quanto à disponibilidade, lotação e segurança. Ultimamente a vibração e o ruído produzido por estes meios de transporte têm afetado a qualidade de vida nas vizinhanças dos trajetos assim como dos seus usuários. Neste artigo, são avaliados os níveis de vibração de corpo inteiro nos usuários de trens urbanos de Porto Alegre (Trensurb) em situações usuais de utilização. Em relação às doses de vibração e de aceleração rms medidas, quando comparados com normas, essas se mostraram baixas, tendo sido verificados valores avaliados no encosto, assento e piso no veículo, abaixo do nível de ação 0,5 m/s² e portanto, longe do limite de exposição 1,1 m/s2 para exposição de 8h. Em geral, os níveis de vibração medidos foram considerados confortáveis, de acordo com valores definidos em normas, entretanto em algumas situações e posições de medição, mostraram-se desconfortáveis.
Urban trains and subways are a Brazilian reality. One major aspect that is delegated to a second plan, concerns the quality transportation referred to availability, capacity and safety. Lately, vibration and noise produced by this means of transport have been affecting the life quality in neighborhoods as well as their users. In this paper, the whole body vibration levels in urban trains in Porto Alegre (Trensurb) are evaluated in some situations. Regarding the vibration and rms acceleration doses, the measured values were very low for the back, seat and floor in the vehicle which resulted below the action limit 0.5 m/s² thus, far from the exposure limit 1.1 m/s2 for an 8h exposure time. Generally speaking, the measured vibration levels are considered comfortable, according to values defined in standards, however in some positions and situation, they can be considered uncomfortable.Os trens urbanos e metrôs são uma realidade brasileira. Um aspecto importante que é delegado a um segundo plano, diz respeito à qualidade do transporte quanto à disponibilidade, lotação e segurança. Ultimamente a vibração e o ruído produzido por estes meios de transporte têm afetado a qualidade de vida nas vizinhanças dos trajetos assim como dos seus usuários. Neste artigo, são avaliados os níveis de vibração de corpo inteiro nos usuários de trens urbanos de Porto Alegre (Trensurb) em situações usuais de utilização. Em relação às doses de vibração e de aceleração rms medidas, quando comparados com normas, essas se mostraram baixas, tendo sido verificados valores avaliados no encosto, assento e piso no veículo, abaixo do nível de ação 0,5 m/s² e portanto, longe do limite de exposição 1,1 m/s2 para exposição de 8h. Em geral, os níveis de vibração medidos foram considerados confortáveis, de acordo com valores definidos em normas, entretanto em algumas situações e posições de medição, mostraram-se desconfortáveis.
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