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Difference between revisions of "Human Vibration"
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======VDV====== | ======VDV====== | ||
The VDV is the forth power Vibration Dose Value. It is calculated as a cumulative sum of the weighted acceleration at the forth power. The forth power is used to give more weight to the transient event of the signal over the periodic event. Therefore, this indicator must be used to | The VDV is the forth power Vibration Dose Value. It is calculated as a cumulative sum of the weighted acceleration at the forth power. The forth power is used to give more weight to the transient event of the signal over the periodic event. Therefore, this indicator must be used to assess the effect of shock on human health and comfort. The VDV is calculated for each channel and expressed in m/s^(1.75).<br> | ||
If the "VDVTexp" box is checked, an evaluation of the VDV value over a longer time period will be calculated of each channel as : <br><br> | If the "VDVTexp" box is checked, an evaluation of the VDV value over a longer time period will be calculated of each channel as : <br><br> | ||
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With <math>T_m</math> the duration of the measurement and <math>T</math> the total exposure duration represented by the "Reference time" parameter, and <math>k_{X}=k_{Y}=1.4</math>, and <math>k_{Z}=1</math> | With <math>T_m</math> the duration of the measurement and <math>T</math> the total exposure duration represented by the "Reference time" parameter, and <math>k_{X}=k_{Y}=1.4</math>, and <math>k_{Z}=1</math> | ||
======MSDV====== | ======MSDV====== | ||
This metric is the Motion Sickness Dose Value, used to evaluate the ride comfort in in-vehicle measurement. It is expressed in m.s^(1.5).<br> | This metric is the Motion Sickness Dose Value, used to evaluate the ride comfort in in-vehicle measurement. It is expressed in m.s^(1.5).<br> | ||