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Difference between revisions of "Human Vibration"
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The <math>A_w</math> is the RMS of the weighted acceleration signal. The weighting is applied in accordance with the direction set for each channel and the weighting filter defined for the direction.<br> | The <math>A_w</math> is the RMS of the weighted acceleration signal. The weighting is applied in accordance with the direction set for each channel and the weighting filter defined for the direction.<br> | ||
For each channel, the <math>A_w</math> and <math>A_w(T)</math> will be calculated. The <math>A_w(T)</math> is the | For each channel, the <math>A_w</math> and <math>A_w(T)</math> will be calculated. The <math>A_w(T)</math> is the daily exposure value, defined as : <br><br> | ||
<math display="block" forcemathmode="5">A_w(T) = A_w*k_{i}*\sqrt{\frac{T}{T_m}}</math> | <math display="block" forcemathmode="5">A_w(T) = A_w*k_{i}*\sqrt{\frac{T}{T_m}}</math> | ||
<br> | <br> | ||
With <math>T_m</math> the duration of the measurement and <math>T</math> the total exposure duration represented by the "Reference time" parameter. the <math>k_i</math> factor is defined in the ISO 2631 as <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. the <math>k_i</math> factor is defined in the ISO 2631 as <math>k_X = k_Y = 1.4</math> and <math>k_Z = 1</math>. | ||
When comparing result from one measurement point in the three direction, the maximum of the | When comparing result from one measurement point in the three direction, the maximum of the daily exposure value must be used as the total daily exposure value at that point :<br><br> | ||
<math display="block" forcemathmode="5">A_w(T) = max(A_{wX}(T), A_{wY}(T), A_{wZ}(T)) </math> | <math display="block" forcemathmode="5">A_w(T) = max(A_{wX}(T), A_{wY}(T), A_{wZ}(T)) </math> | ||
<br> | <br> | ||
======av====== | ======av====== | ||
The <math>a_v</math> is the total RMS vibration value of the weighted acceleration signal. This value will only be calculated if a sensor have been defined in the definition of direction window. | The <math>a_v</math> is the total RMS vibration value of the weighted acceleration signal. This value will only be calculated if a sensor have been defined in the definition of direction window. | ||