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Calculating the level of exposure

The current legislation prescribes that the level of exposure to vibration is 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:

where:

Te :         Total daily duration of exposure to the vibration (hours)

avmax    Highest of the three orthogonal axes acceleration values:

a_wmax(m/s²) = MAX( 1,4 a_wx ; 1,4 a_wy ; a_wz )

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

where:

a²maxi : frequency-weighted acceleration for the i-th operation

T_i: Exposure duration for the i-th operation (hours)