847
edits
Difference between revisions of "Human Vibration"
Jump to navigation
Jump to search
→Indicators
(→Dk) |
|||
| Line 192: | Line 192: | ||
Assessing the affect of the vibration on human spine most is important when dealing with transportation vehicular, especially from driver seat. for a better evaluation, the ISO 2631-5 advise to calculate the daily acceleration dose, defined as : <br> | Assessing the affect of the vibration on human spine most is important when dealing with transportation vehicular, especially from driver seat. for a better evaluation, the ISO 2631-5 advise to calculate the daily acceleration dose, defined as : <br> | ||
<math display="block" forcemathmode="5">D_{X,Y,Z}(T) = D_{X,Y,Z}*\sqrt[6]{\frac{T}{T_m}}</math> <br> | |||
This value will be calculated if the box "Dk Texp" is checked. | |||
======Se====== | ======Se====== | ||
The Se is the compressive stress on the human spine. It is calculated by the combination the Dk in the three direction. Therefore, it will only be calculated if sensors are defined in the "Select Direction" window. One value of Se will be calculated for each sensor by the formula : <br> | |||
<math display="block" forcemathmode="5">Se = \sqrt[6]{\sum_{k=X,Y,Z}{(D_{k}*m_{k})^6}</math> <br> | |||
Where <math>m_{X} = 0,015 MPa/(m/s2)</math>, <math>m_{Y} = 0,035 MPa/(m/s2)</math> and <math>m_{Z} = 0,032 MPa/(m/s2)</math>. <br> | |||
To evaluate the limbar stress over a whole exposition time, the Se(T) will also be calculated as : <br> | |||
<math display="block" forcemathmode="5">Se(T) = \sqrt[6]{\sum_{k=X,Y,Z}{(D_{k}(T)*m_{k})^6}</math> <br> | |||
T beeing the total exposure duration represented by the "Reference time" parameter.<br> | |||
====In the toolkit==== | ====In the toolkit==== | ||