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Difference between revisions of "Human Vibration"
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|style="height:30px; width:100px;"|<math>A_w</math> | |style="height:30px; width:100px;"|<math>A_w</math> | ||
|RMS of the weighted acceleration magnitude. | |RMS of the weighted acceleration magnitude. | ||
|- | |||
|style="height:30px; width:100px;"|<math>a_v</math> | |style="height:30px; width:100px;"|<math>a_v</math> | ||
|Total RMS value calculated as a quadratic average of the three direction for each tri-axial sensor. | |Total RMS value calculated as a quadratic average of the three direction for each tri-axial sensor. | ||
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For each tri-axial sensor, the <math>a_v</math> will be calculated as a quadratic average of the weighted RMS value in the three directions :<br> | For each tri-axial sensor, the <math>a_v</math> will be calculated as a quadratic average of the weighted RMS value in the three directions :<br> | ||
<math display="block" forcemathmode="5">a_v = \sqrt{a_{vX}*k_{X} + a_{vY}*k_{Y} + a_{vZ}*k_{Z}}</math> | <math display="block" forcemathmode="5">a_v = \sqrt{{a_{vX}*k_{X}}^{2} + {a_{vY}*k_{Y}}^{2} + {a_{vZ}*k_{Z}}^{2}}</math> | ||
With <math>k_{X,Y,Z}</math> a factor defined in the ISO 2631 as <math>k_{X}=k_{Y}=1.4</math> and <math>k_{Z}=1</math> | With <math>k_{X,Y,Z}</math> a factor defined in the ISO 2631 as <math>k_{X}=k_{Y}=1.4</math> and <math>k_{Z}=1</math> | ||
======Ah====== | |||
The <math>A_h</math> is the RMS of the <math>W_h</math> weighted acceleration signal for hand-arms vibration measurement. <br> | |||
For each channel, the <math>A_h</math> and <math>A_h(T)</math> will be calculated. The <math>A_h(T)</math> is the Daily exposure value, defined as : <br> | |||
<math display="block" forcemathmode="5">A_h(T) = A_h*\sqrt{\frac{T_m}{T}}</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. | |||
If any sensor is defined, the total <math>A_h</math> and <math>A_h(T)</math> will be calculated for each sensor as a quadratic average of the three direction of the sensor : <br> | |||
<math display="block" forcemathmode="5">A_h_Total = \sqrt{{a_{hX}*k_{X}}^{2} + {a_{hY}*k_{Y}}^{2} + {a_{hZ}*k_{Z}}^{2}}</math> | |||
and : <br> | |||
<math display="block" forcemathmode="5">A_h_Total(T) = \sqrt{{a_{hX}*k_{X}}^{2} + {a_{hY}*k_{Y}}^{2} + {a_{hZ}*k_{Z}}^{2}}*\sqrt{\frac{T_m}{T}}</math> | |||
<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}=k_{Z}=1</math> | |||
====In the toolkit==== | ====In the toolkit==== | ||