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Development of an LS-DYNA Occupant Model for use in Crash Analyses of Roadside.pdf

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Kirkpatrick, et al. 1 Development of an LS-DYNA Occupant Model for use in Crash Analyses of Roadside Safety Features Steven W. Kirkpatrick, Robert MacNeill, and Robert T. Bocchieri Applied Research Associates, Inc., 2672 Bayshore Parkway, Suite 1035, Mountain View, California 94043 Ph. 650-625-8150, Fax 650-625-8145, skirkpatrick@, rmacneill@, rbocchieri@ Paper No. 03-4450 Submitted: August 1, 2002 Revised: November 15, 2002 Word Count: 3,988 This paper presents the development and validation of an LS-DYNA finite element occupant model suitable for use in crash analyses of roadside safety features. The addition of an occupant model in crash simulations can provide a link between vehicle accelerations and occupant injury. Injury measures for the vehicle occupants can provide additional evaluation criteria for the effectiveness of roadside safety features. The use of an occupant model in roadside hardware crash analyses will also improve the fidelity of the crash analysis by correctly modeling the inertial effects of the occupants and their interaction with the vehicle motions. The approach used here is to construct much of the occupant model from rigid bodies connected by joints. The geometry and weight of each body segment were obtained from specifications of anthropomorphic test devices (ATDs) commonly used in crash testing. Additional flexible components of the occupant model, such as the neck and spine, were modeled using deformable elements with geometry and properties chosen to match those of the ATDs. Using the correct combination of deformable and rigid components results in an occupant model that is computationally efficient and capable of simulating occupant kinematics in a collision. INTRODUCTION There has been an ongoing research program sponsored by the Federal Highway Administration (FHWA) to develop modeling tools and advance the use of finite element crash analyses for design of roadside safety features (1,2) . To assist in this effort, FHWA
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