A 3-D finite element model of a bare aluminum vehicle hull with multiple access openings for the driver’s hatch, the commander’s cupola, engine access opening, exhaust grills, cargo hatch, as well as rear door cutout, representing the basic hull of the Armored Personnel Carrier (APC) M113A2 was generated using PATRAN 3 pre/post-processor program. Frequencies and modeshapes obtained using the ADINA finite element code were compared with available experimental modal analysis data for the metallic hull.

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