### Vibration Dose Value (VDV) Rating

Strutt|Criteria|Ratings|Vibration|eVDV calculates the estimated Vibration Dose Value eVDV from the current row of the spreadsheet and inserts it into Column D of the current row.

'True' VDV = int_0^T a^4(t) dT must be measured by equipment with VDV capability; however eVDV may be estimated from measured vibration levels with acceptable accuracy provided that the vibration is not too impulsive (with a crest factor of 6.0 or less).

Strutt calculates eVDV as follows:

eVDV = 1.4 a_(rms) t^0.25, where:

a_(rms) is the frequency-weighted acceleration measured over a time period of t seconds.

Strutt allows the user to select the weighting function - either unweighted, the W_b or W_d ratings. (See BS6841 Rating Curves for the weightings used).

The vibration level can be entered in any of engineering units or dB, as displacement, velocity or acceleration. Strutt converts the vibration using the Vibration Converter to calculate eVDV

Reference: BS6472 (1992) Guide to evaluation of human exposure to vibration in buildings (1 Hz to 80 Hz)