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HAV - Calculating the level of exposure

 

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Calculating the level of exposure

  

The current legislation establishes that the level of exposure to vibration shall be assessed by the calculation of the frequency-weighted equivalent acceleration value over an eight-hour reference period. This can be calculated by using the following formula:

formula matematica

where:

Te :                        Total daily duration of vibration exposure (hours)
av                         Acceleration value resulting from the vectorial sum of the components measured on the orthogonal axes:

formula matematica

If the worker is exposed to different vibration values, as in the case of  the usage of several machines in a working day, the daily vibration exposure A(8) expressed as m/s2, will be calculated as follows:

formula matematica
where:

a2vi : vectorial sum of the frequency-weighted acceleration for the i-th operation
Ti : Exposure duration for the i-th operation (hours)

 

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