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Abstract
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OBJECTIVE: The objective of this study was to compare and evaluate the difference in head kinematics between the TNO and THUMS model in pedestrian accident situations.
METHODS: The TNO pedestrian model (version 7.4.2) and the THUMS pedestrian model (version 1.4) were compared in one experiment set up and fourteen different accident scenarios where the vehicle velocity, leg posture, pedestrian velocity and pedestrian's initial orientation were altered. In all simulations, the pedestrian model was impacted by a sedan. The head trajectory, head rotation and head impact velocity were compared, as was the trend when various different parameters were altered.
RESULTS: The multi-body model had a larger head Wrap Around Distance for all accident scenarios. The maximum differences of the head's center of gravity between the models in the global x-, y- and z-direction at impact were 13.9 cm, 5.8 cm and 5.6 cm, respectively. The maximum difference between the models in head rotation around the head's inferior-superior axis at head impact was 36°. The head impact velocity differed up to 2.4 m/s between the models. The two models showed similar trends for the head trajectory when the various parameters were altered.
CONCLUSIONS: There are differences in kinematics, between the THUMS and TNO pedestrian models. However, these model differences are in the same magnitude as those induced by other uncertainties in the accident reconstructions, such as initial leg-posture and pedestrian velocity.
Language: en |