Aims of the research
This study aims to modify the lower body (the pelvis, thigh, and leg) of the
mid-sized male pedestrian dummy FE model by considering the latest version of
the physical dummy and to evaluate both the accuracy by comparing test results
of the past studies and the biofidelity specified in SAE J2782 in both component
and full-scale validations.
Methods
-
1
Component validation
The validation of the modified pelvis model was performed in dynamic
lateral compression simulations. The sacrum and the pubis
force-deflection responses of the iliac or the acetabulum impact
were measured. The modified thigh and leg models were evaluated in a
dynamic 3-point lateral bending simulation, measuring the
force-deflection responses. The results from the simulations were
compared with test results and the biofidelity requirements.
-
2
Full-scale validation
The whole-body model was updated by incorporating these modified
component models. The model of the generic buck developed for the
assessment of pedestrian whole-body impact response and specified in
SAE J3093 was used in this study. The buck model was made to collide
with the full-scale dummy model at 40 km/h laterally. The
trajectories of the head, upper spine, mid-thorax, and pelvis were
measured and compared with those of the test results and the
biofidelity requirements.
Results
The force-deflection responses from the pelvis, thigh, and leg models were
similar to those of the test results, indicating they almost fell within the
biofidelity requirements.
As the results of the full-scale simulation, the trajectories of the head, upper
spine, mid-thorax, and pelvis showed a strong agreement with those of the test
results, indicating almost the same tendency as the biofidelity corridors,
except for that of the pelvis.
Conclusions
As the results of component and full-scale validations, the equivalences of the
modified pedestrian dummy model to test results and the biofidelity were
confirmed in most cases.
