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Difference between revisions of "Human Vibration"
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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> | 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{ | <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>. | ||
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The <math>A_h</math> is the RMS of the <math>W_h</math> weighted acceleration signal for hand-arms vibration measurement. 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><br> | The <math>A_h</math> is the RMS of the <math>W_h</math> weighted acceleration signal for hand-arms vibration measurement. 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><br> | ||
<math display="block" forcemathmode="5">A_h(T) = A_h*\sqrt{\frac{ | <math display="block" forcemathmode="5">A_h(T) = A_h*\sqrt{\frac{T}{T_m}}</math> <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.<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.<br> | ||
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and : <br> | and : <br> | ||
<br> | <br> | ||
<math display="block" forcemathmode="5">A_{h Total}(T) = \sqrt{{a_{hX}}^{2}*{k_{X}}^{2} + {a_{hY}}^{2}*{k_{Y}}^{2} + {a_{hZ}}^{2}*{k_{Z}}^{2}}*\sqrt{\frac{ | <math display="block" forcemathmode="5">A_{h Total}(T) = \sqrt{{a_{hX}}^{2}*{k_{X}}^{2} + {a_{hY}}^{2}*{k_{Y}}^{2} + {a_{hZ}}^{2}*{k_{Z}}^{2}}*\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, and <math>k_{X}=k_{Y}=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}=k_{Z}=1</math> | ||
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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> | ||
<math display="block" forcemathmode="5">VDV_{X,Y,Z}(T) = VDV_{X,Y,Z}*k_{X,Y,Z}*\sqrt[4]{\frac{ | <math display="block" forcemathmode="5">VDV_{X,Y,Z}(T) = VDV_{X,Y,Z}*k_{X,Y,Z}*\sqrt[4]{\frac{T}{T_m}}</math> <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, 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> | |||
Although this value will be calculated for each direction, only the Z-direction will have a prominent relevance to assess ride comfort. | |||
======Dk====== | ======Dk====== | ||