Design of Vehicle Bonnet Structure for Pedestrian Safety
博士 === 大葉大學 === 機械與自動化工程學系 === 98 === Thousands of pedestrians are killed or maimed seriously in automotive-related accidents annually. Head and face injuries in car-pedestrian accidents account for 60% of all pedestrian fatal injuries, whereas 17.3% of head injuries were due to the bonnet. Above fi...
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| Format: | Others |
| Language: | en_US |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/86757141176917197287 |
| Summary: | 博士 === 大葉大學 === 機械與自動化工程學系 === 98 === Thousands of pedestrians are killed or maimed seriously in automotive-related accidents annually. Head and face injuries in car-pedestrian accidents account for 60% of all pedestrian fatal injuries, whereas 17.3% of head injuries were due to the bonnet. Above figures demonstrate the necessity to more carefully consider the bonnet in pedestrian head safety. This study analyzes the constitution and variation of resultant acceleration in head-to-bonnet impacts. Exactly how each component of acceleration (normal and tangential accelerations) contributes to the resultant acceleration of the head center. This study also considers how structural design parameters affect on each component of acceleration. Causes make the characteristic variation of resultant acceleration differed from optimal characteristic pulse will be analyzed and discussed in details. Thus, these analyzed results contribute to efforts to design vehicle bonnet structures and pave the way for developing pedestrian protection technologies. Bonnet structure differs significantly among automobile models. It is very important to select the most effective thickness values of bonnet skin and bonnet reinforcement for each bonnet structure. This research analyzes the effect of bonnet skin and bonnetreinforcement thickness on pedestrian head injury by performing simulation of headform impactors to bonnet tests according to EEVC/WG17 regulations with different thickness values. An optimization method of selecting the most effective thickness values of bonnet skin and bonnet reinforcement will be introduced. Many positions on bonnet surface are considered to enhance pedestrian friendliness by using this method. Base on analysis results in this research, the bonnet structure of a particular model of automobile has designed for pedestrian safety. The bonnet structure is designed to get the resultant acceleration of the head center of gravity close to optimal characteristic pulse. Moreover, bonnet with the optimal thickness values is not only pedestrian-friendly but also as stiff as possible.
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