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Sign Convention

To extract occupant injury criteria from the model, the following preparations have been made:

All relevant coordinate systems are defined according to the SAEJ211 norm. This means that all coordinate axes in the dummy are oriented with respect to an upright standing dummy. Thus the x-axis of the coordinate systems in the upper legs points upwards as shown in Figure 1.

Orientation of the coordinate systems for accelerometers and load cells in the WORLDSID 50th model

 

Figure 1: Orientation of the coordinate systems for accelerometers and load cells in the WORLDSID 50th model.

 

Only the coordinate systems for evaluating injury criteria are oriented in this scheme. There are many more coordinate systems in the model which are sometimes oriented arbitrarily because of internal features in the dummy.