Dynamic Analysis of Elevation Indicator Module, XM224 60 mm Mortar
Technical research note
FRANKFORD ARSENAL PHILADELPHIA PA
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The report describes a dynamic analysis of the elevation endicator module on the XM224 mortar which was conducted to determine the cause of level vial failures during field firing. The unit is modeled as a spring mounted beam and its response to a theoretical firing shock is determined. The analysis shows that the modules lack of symmetry results in a severe rotational response for a purely translation shock input. As a result of rotational response, the level vial experiences relatively high bending stresses during the firing shock. It is concluded that these high bending stresses are the cause of the field failures. Recommendations are made for increasing the shock resistance of the module by increasing its bending stiffness and by making the unit more symmetrical.
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