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Difference between revisions of "Human Vibration"
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==Calculating the other indicators with NVGate== | ==Calculating the other indicators with NVGate== | ||
===<math>A_w</math>=== | ===<math>A_w</math>=== | ||
<math>A_w</math> is the daily vibration dose. | <math>A_w</math> is the daily vibration dose. It is calculated from an average of the RMS values form the weighted signal and represent the "quantity" of vibration the human body will receive when using of the tested equipment. | ||
This value is defined as : <math>A_w = \sqrt{(k_{x}*a_{w_{x}})^2+(k_{y}*a_{w_{y}})^2+(k_{z}*a_{w_{z}})^2}</math>, with <math>k_i</math> defined in the standard and <math>a_{w_{x}}</math> the RMS value of the weighted acceleration signal in accordance to the direction, as defined in the [[Human_Vibration#Time-weighting_filters|table of the precedent section]].<br><br> | This value is defined as : <math>A_w = \sqrt{(k_{x}*a_{w_{x}})^2+(k_{y}*a_{w_{y}})^2+(k_{z}*a_{w_{z}})^2}</math>, with <math>k_i</math> defined in the standard and <math>a_{w_{x}}</math> the RMS value of the weighted acceleration signal in accordance to the direction, as defined in the [[Human_Vibration#Time-weighting_filters|table of the precedent section]].<br><br> | ||
====Calculation in NVGate==== | |||
To calculate the <math>A_w</math> in NVGate, calculmate the [[NVGate Time Domain Analysis#RMS|RMS level]] of the weighted signal in [[NVGate_Post_Analysis|Post analysis]]. Here, we will calculate the <math>A_w</math> for the SeatPad measurement as defined for a whole-body measurement in the ISO 2651. According to the [Human_Vibration#Time-weighting_filters|table]], we need to calculate the RMS level of the <math>W_k</math> weighted signal for the Z direction and the <math>W_d</math> weighted signal for the X and Y directions. You then must [[NVGate Display|display]] the three RMS level in the same window :<br><br> | |||
[[Image:RMS.png]] | |||
===Ah and Ah(8)=== | ===Ah and Ah(8)=== | ||