An Analytical Approach To Derive Free Package Space Requirement for Pedestrian Head Form 2019-26-0013
Traffic accidents data shows a significant number of pedestrian fatalities globally. According to a survey of 35 European countries, pedestrians represented an average of 25% of all road user fatalities. In Japan, pedestrian fatalities accounted for 28% of the road toll and approximately 16% in Australia. These figures compare with 13% for the USA and 40-50% for India and Thailand (1). Various pedestrian safety requirements are mandated in different markets in recent years worldwide. For pedestrian head-form, vehicle front-end styling and the free package space below bonnet plays a vital role in deciding the pedestrian head-form safety performance. Currently during initial phase of vehicle development, the free package requirements is decided based on benchmark data. However, the benchmark data does not give any insight in physics involved and is subjective in nature as it varies from vehicle to vehicle. This paper is gives an analytical approach for defining the free package space requirements for meeting the targeted pedestrian head form performance. The analytically derived Head Injury Criteria Vs package space is also compared with physical test results. Using analytical approach an ideal two-step Head-form deceleration waveform is also derived for effective use of available free package space. This information will be very useful for the simulation engineers for development of the designs for pedestrian performance requirements.
Pratap Daphal, Ashish Mahapatre
Tata Motors, Ltd.
Symposium on International Automotive Technology 2019