The BALANS analysis uses finite element (Lumped Parameter) models to represent both the projectile
and gun tube. The characteristics of a lumped parameter models are:
- The BALANS lumped parameter model is made up of nodes and two-noded "beam-like" elements.
- The elements are "beam-like" in that they are linear (i.e., one element between each node).
- However, the elements are different than the typical
two-noded finite element beam since they are made up of several element "shapes".
- The stiffness of one element is actually a "composite" stiffness with each element shape making
a contribution to the overall stiffness of the element.
- Additional masses can be added at nodes to represent mass not contained in the model.
- A linear spring is placed at the aft bore riding location on the projectile model and a linear or non-linear spring is
placed at the forward bore riding location on the projectile model.
- The gun tube is supported by linear springs; one for recoil and one each for forward/aft lateral support.
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