Paul Thomas

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Questions related from Paul Thomas

What are the main changes in Bird strike modelling parameters at sea level and 8000 ft altitude?

Trying to understand the changes in bird modelling parameters at sea level and 8000 ft altitude for a bird strike. I have modelled a 4lb bird in LSDYNA using SPH Lagrangian technique using...

13 November 2021 2,533 2 View

How to find the eigenvectors within a specific eigenvalue range for a large sparse symmetric matrix (162000 by 162000)?

Hello, I would like to find all the eigenvectors within a specific eigenvalue range. The matrix i am dealing with is large sparse symmetric matrix with size 162000 by 162000. I am...

31 August 2017 4,788 3 View

Why the first 6 rigid body modes are not zero in a Free- Free analysis?

Hello, Recently i have done a MSC NASTRAN Free-Free analysis for a FEM consisting of only one beam element (See Figure:1 in attached excel sheet). I could not get the all eigenvalue roots of the...

31 May 2017 6,654 8 View

How to use UM option for RBE3 dependent node to avoid conflict with ASET node list (RBE3 dependent node included) in MSC NASTRAN?

I am trying to do a static condensation (EXTSEOUT) in MSC NASTRAN for a simple box structure as shown in the attached “RBE3_dependent_dof_conflict_with_ASET.docx”. I have applied a multi point...

05 April 2017 4,723 4 View