Development and evaluation of a biofidelic shoulder for the IHRA (JARI) pedestrian model

Neale, Michael S.; Hardy, Brian J.; Lawrence, Graham J. L.

Affiliations

Abstract

Alterations were made to the shoulders of the Japan Automobile Research Institute (JARI) pedestrian model. The International Harmonised Research Activities Pedestrian Safety Group (IHRA PSG) has chosen the JARI pedestrian model as a basis to develop an improved humanoid pedestrian model. It is anticipated that when the development and validation of this model has been finalised it can be used to refine the current IHRA pedestrian head impact test procedures. In the work described here the shoulders of the JARI pedestrian model were improved to more accurately represent the structure and range of movement observed in real shoulders. Improvements to the model were validated by comparing the original and modified models' predictions against measures from Post Mortem Human Surrogate (PMHS) shoulder impact studies presented in the published literature. In contrast to the original JARI model the predictions from the modified JARI model were comparable to equivalent measures from the PMHS impact studies. Predicted peak shoulder impact forces from the original JARI pedestrian model were up to eight times larger than those measured in the PMHS impact studies or predicted by the modified JARI pedestrian model. Vehicle to pedestrian impacts were then simulated with the original and modified JARI models and predicted head impact responses from the models were compared. Head impact velocities from the modified JARI model were between 0.33 and 1.43 m.s-1 (2 and 14 %) greater than those predicted by the original JARI pedestrian model. Furthermore, it was found that a vehicle strike to the rear of the pedestrian models rather than to the side, lead to an increase in head impact velocity of up to 4.55 m.s-1 (39 %). However, before the IHRA PSG make decisions on the JARI model's head impact predictions further reviews of its structure and biofidelic responses are needed.

Links

URL: http://www-nrd.nhtsa.dot.gov/pdf/esv/esv19/05-0096-W.pdf

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Cited By (1)

Year	Entry
2017	Chen H. Evaluating Pedestrian Head Sub-System Test Procedure Against Full-Scale Vehicle-Pedestrian Impact Using Numerical Models [PhD thesis]. Charlottesville, VA: University of Virginia; May 2017.