Positioning, Tree File

The BioRID2 model is delivered with a tree file for the OASYS Primer pre-processor (may work also for ALTAIR Hypermesh, not verified by DYNAmore). This allows the user to position the dummy and adjust the parts according to their degrees of freedom.

Figure 11 : Joints in the BioRID2 model

Figure 11 shows the connections of movable parts via tree file. The accompanying local coordinate systems are shown in Figure 5. All revolute joints are visualized by beams. An additional spherical joint is modelled at the H-point. It is connected to a global co-ordinate system which can translate but not rotate. Thus, it is possible to measure the pelvis angle during simulation. This might be of interest particularly during a simulation for positioning the model and is also used to determine the initial pelvis angle with OASYS Primer.

Movable parts and revolute joints are:

• Hand,left and right (stop angle: ± 50.0 degrees)

• Wrist,left and right (stop angle: ± 90.0 degrees)

• Lower arm, left and right (stop angle: -90.0 and 1.0 degrees)

• Elbow, left and right (stop angle: ± 90.0 degrees)

• Upper arm, left and right (stop angle: -1.0 and 60.0 degrees)

• Yoke, left and right (stop angle: -20.0 and 90.0 degrees)

• Foot, left and right about their ankle joints (stop angle: local x and z direction ± 5.0 degrees,  local y direction -20.0 and 45.0 degrees)

• Lower leg, left and right about their knee joints (stop angle: -0.1 and 90.0 degrees)

• Upper leg, left and right about their hip joints (stop angle: -10.0 and 20.0 degrees)
  

If the upper legs are rotated at the hip joints about the given stop angles, initial penetrations will occur. This can be observed in the hardware also.

Figure 12 : Location of H-point and initial pelvis angle

Figure 12 shows the location of H-Point and the pelvis position indicator. More details are given in the ”User’s Guide BioRID II; 2002, Denton ATD, Inc.”.

The following delivering position is used: