A study on the development of equivalent beam analysis model on pedestrian protection bumper impact |
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Authors: | Park Dong-Kyou Jang Chang-Doo |
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Affiliation: | 1.Department of Mechanical and Automotive Engineering, Daeduk University, Daejeon, 305-715, Korea ;2.RIMSE, Department of Naval Architecture & Ocean Engineering, Seoul National University, Seoul, 151-742, Korea ; |
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Abstract: | This paper presents a dynamically equivalent beam analysis model on pedestrian protection bumper impact instead of a non-linear
finite element impact analysis method. Equivalent beam analysis model was developed by substituting the femur and tibia for
dynamically equivalent Euler beam. Dynamically equivalent forces of bumper beam, upper stiffener and lower stiffener are found
by a finite element analysis results and applied to the Euler beam model of lower legform impactor. This equivalent beam analysis
model was used to obtain a bending angle of lower legform impactor by using finite element beam theory. Peak acceleration
of the tibia was obtained by developing an approximate acceleration equation. A linear interpolation of non-linear finite
element analysis results considering the dimension variation of bumper beam factors affecting the acceleration was used to
get an approximate acceleration equation. The accuracy of this simple analysis model was tested by comparing its results with
those of the non-linear finite element analysis. Tested bumper beam types were press type beam and roll forming beam used
widely in the current car bumpers. The differences of maximum acceleration of the tibia between the two models did not exceed
10% and the bending angle did not exceed 20%. This accuracy is enough to be used in the early stage of bumper beam design
to check the bumper pedestrian performance quickly. Use of equivalent beam analysis model is expected to reduce the analysis
time with respect to the non-linear finite element analysis significantly. |
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