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Pelvis and Torso Angle

The pelvis, torso and head angles are measured in the physical WorldSID by three tilt sensors. These three sensors are also included in the model. They can be used to measure the pelvis and torso angle as shown in the following figure.

Measurement Pelvis Angle 

Cut through WorldSID model with positions of tilt sensors


The initial position of the WorldSID model uses a pelvis angle of 14.5 degrees. For this position, the H-Point tool, which is used to measure the pelvis angle without tilt sensor, has an angle of 45 degrees below the horizontal. For this pelvis angle, the torso (top of the lower neck bracket is horizontal) and head (upper neck load cell is horizontal) angle is zero degrees.