Exposure – the most common error

The most common error in the assessment of the exposure of workers to vibration is related to the assigned exposure times.

In the case of hand-arm must count the time when the worker is exposed to vibration; one should not count on a period in which a worker has landed the equipment or that is holding it without being in operation. The contact time is the time during which the hands are effectively exposed to vibration from the tool or workpiece. Often, This period is much lower than the ' working time ' and is usually overrated by operators. Read more

Evaluation of exposure of workers at vibrations – hand arm


During our day-by-day we are exposed to vibration, one way or another, in cars, buses, train, etc. Many people are also exposed to other vibrations, during your work, for example those produced by hand tools, machines or heavy vehicles.

Here will be only referred to the undesirable vibrations: the effect of overexposure to vibration; the various factors that should be taken into account when it is measured, How is measured and evaluated, and what actions can be developed to reduce sources of harmful and/or dangerous vibrations.


Legal and regulatory references (in Portugal) are the following: Read more

Evaluation of exposure of workers at vibrations – frequency weighting


To understand the reason why humans are more sensitive to some frequencies than others is useful to consider the human body as a mechanical system. The system is complicated by the fact that: (a) each body part has your greater sensitivity in different frequency ranges; (b) the human body is not symmetrical, e (c) There are no two people respond to vibrations in exactly the same way. Anyway, biomechanical models were developed suitable to simulate human response to vibration.


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Exposure assessment of vibration in agricultural machinery and forestry

workers' exposure assessment to vibrations in agricultural and forestry machinery - end of the transitional period

In the decree law 46 from 2006, on the minimum health and safety protection of workers in the event of exposure to risks due to vibrations, It was provided a transitional period for the agricultural and forestry sectors, which envisaged not apply to 6 July 2014 (art. 16º), under certain conditions.

Like this, From this data, the application of this law is mandatory and employers in these sectors should undertake an assessment of workers' exposure to vibrations risks and carry out tests if necessary.

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