Abstract: The head resultant acceleration waveform was adjusted to meet the design requirements of the sandwich bonnet with
honeycomb material to improve the head protection performance during pedestrian impact. The basic extreme conditions of HIC
(head injury criterion) interval were deduced for the actual head acceleration waveform. The response surface of the HIC value
and head displacement and the physical parameters of the honey-composite material used in the engine hood which meet the
extreme conditions were obtained according to the optimal acceleration waveform theory, using the MADYMO and HyperStudy
softwares. The results show that the resultant acceleration waveform can satisfy the actual design target by changing the
Young’s modulus and densification strain of the sandwich composite material.

Key words: pedestrian protection, honey-composite material, engine hood, optimization acceleration waveform, head injury criterion (HIC)