All car manufactUrersare recently required to develop the engine − hood fbr the purpose ofprotecting pedestrian heads」 t is important to control the acceleration time history at the initial stage and late stage f〈)r pedestrian head protection ． The engine − hood fbr pedestrian head protection needs to control bcal rigidity and whole rigidity by just one structure ・ To solve this problem we focus on inner panels which have a dominant ro］ e in absorbing energy ． This stUdy also aimed to evaluate that impact characteristics of inner panels adopting ZETA − stiffened panels improve pedestrian head protection by numerical

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Motor vehicles on the market have been required to undergo the pedesUian head protectien test since 2( X) 4 and engine − ho〔xls need to meet the required standardS fbr pedes 面 an head protection perf ( )nnance in addition to pr ary perfcrmance ． The quality of e ゆ e − hoOd is evaluated by Head injury ( Xiteria ( HIC )derived frcmi 3dmensional acceleration generated against the head． Based on 田 C measurements ， 血e au 山 α s 面 ed to improve it is perb ance by using 由e hood wi 血 pand s血 c 田 re ． h 曲 s血 dy ， we examined impact response characteristics of the pedestrian head by numerical analysis ． We focus on 血 e brain concussion and the skU11 丘acture as a severe i 巾 ry to be 両 ured at 重 he dme ofan engine − hood collision ． As a result ， we revealed about mechanism of the head injury r by dyna血 c deformation behavi (rr ofthe engine − hood， Key W 加 ds： Engine − hood( Bonnet ) ， Pedestrian protect ， Head injury criteria ( H 【 C ) ， Concussion ， Skull fracture ， Negative pressure ， Mises stress ．

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