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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Sponsor: Underbody Modeling Monitor: US Army TARDEC, ARL/SLAD, ATEC For T&E Program Warren, MI (ARL/SLAD and ATEC jointly) SPONSOR/MONITOR'S REPORT Aberdeen, MD NUMBER(S) #23785 (TARDEC) #23785 (TARDEC) DISTRIBUTION / AVAILABILITY STATEMENTUNCLASSIFIED: Distribution Statement A. Approved for Public Release, Unlimited Distribution SUPPLEMENTARY NOTES ABSTRACTDue to the severity of forces exerted during an IED blast, ground vehicles undergo multiple sub-events including local structural deformation of the floor, blast-off, free flight and slam-down (including roll-over). The entire blast event from blast-off to slam-down may last as long as 2 seconds in duration depending on several parameters such as vehicle weight, charge size and location. Simulation of the entire blast event is computationally intensive due to the high fidelity levels of the model and the long duration of the event. The purpose of this project was to develop a computationally-efficient, reduced order model to simulate all these events in one single simulation. These reduced order models can be used for rapid evaluations of military ground vehicles due to short turn-around simulation times. Models were developed using MADYMO's rigid body and finite element integration techniques to simulate all critical sub-events a ground vehicle undergoes during a blast event from blast-off to slam-down. The report provides different methodogies used in MADYMO simulations, their performance results and comparisons.

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