The effect of impact speed on the HIC obtained in pedestrian headform tests

Pedestrian headform impact tests are generally carried out at a fixed impact speed, which varies depending on the test protocol in use. Thus, it may be desirable to extrapolate a single test result to higher and lower test speeds. This paper investigates the influence of impact speed on the Head Injury Criterion (HIC) and the peak dynamic displacement. The relationship between impact speed and these test measurements is first considered analytically using a linear spring model, and then empirically using the results of 29 headform tests on seven different locations. The results indicate that power functions can be used to predict the effect of impact speed, with exponents of approximately 2.5 for HIC and 0.8 for peak displacement. These relationships might be used for assessing head impact performance over a wider range of speeds than are presently tested.

[1]  Koji Mizuno,et al.  Head injuries in vehicle-pedestrian impact , 2000 .

[2]  Robert Anderson,et al.  Headform impact test performance of vehicles under the GTR on pedestrian safety , 2009 .

[3]  Cheol Oh,et al.  Research and Rule-Making Activities on Pedestrian Protection in Korea , 2005 .

[4]  D J Searson,et al.  Predicting vehicle performance under the Global Technical Regulation on pedestrian protection using ANCAP test results , 2009 .

[5]  Hamid M. Lankarani,et al.  Evaluation of the kinematics and injury potential to different sizes of pedestrians impacted by a utility vehicle with a frontal guard , 2011 .

[6]  Robert Anderson,et al.  Phenomenological continuous contact–impact modelling for multibody simulations of pedestrian–vehicle contact interactions based on experimental data , 2009 .

[7]  Xuejun Liu,et al.  A Study of Influences of Vehicle Speed and Front Structure on Pedestrian Impact Responses Using Mathematical Models , 2002 .

[8]  Joachim Schäfer,et al.  Structural Hood and Hinge Concepts for Pedestrian Protection , 2005 .

[9]  T Paul Hutchinson,et al.  Pedestrian Headform Testing: Inferring Performance at Impact Speeds and for Headform Masses Not Tested, and Estimating Average Performance in a Range of Real-World Conditions , 2012, Traffic injury prevention.

[10]  Clifford C. Chou,et al.  Estimating the Minimum Space to Meet Federal Interior Head Impact Requirement , 1995 .

[11]  K. H. Hunt,et al.  Coefficient of Restitution Interpreted as Damping in Vibroimpact , 1975 .

[12]  G. W. Nyquist,et al.  Analytical Studies of the Head Injury Criterion (HIC) , 1974 .

[13]  Dot Hs,et al.  HIC Test Results before and after the 1999-2003 Head Impact Upgrade of FMVSS 201 , 2006 .

[14]  Jun Xu,et al.  Investigation on Energy Absorption Characteristics of PVB Laminated Windshield Subject to Human Head Impact , 2010 .

[15]  J Svoboda,et al.  Analysis of collision between pedestrian and small car , 2003 .

[16]  Cheol Oh,et al.  Assessing the safety benefits of an advanced vehicular technology for protecting pedestrians. , 2008, Accident; analysis and prevention.

[17]  Christophe Bastien,et al.  Computer simulation of real-world vehicle–pedestrian impacts , 2011 .

[18]  Antonio Bicchi,et al.  Fast and "soft-arm" tactics [robot arm design] , 2004, IEEE Robotics & Automation Magazine.