Update logic to determine which modes are rigid body - #55
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Hello, it's me again
With the new defined fluid mass method for slosh in Simcenter (NX) Nastran, the old method of determining the number of rigid body modes was incorrectly flagging some slosh modes as rigid. This small change updates the logic to look for eigenvalues, a.k.a. lambda, less than 1. In my testing on real-world models, this works for fixed and free-free structures with slosh.