## BCSSTK12: BCS Structural Engineering Matrices (eigenvalue matrices)Ore car -- consistent mass

### from set BCSSTRUC1, from the Harwell-Boeing Collection

From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM12 from BCSSTRUC1 set.
BCSSTK11, BCSSTM11, BCSSTK12 and BCSSTM12 represent the lumped and consistent mass formulation for an ore car model. In both cases the consistent mass formulations lead to non-diagonal mass matrices. The eigenvalues from the two formulations of a model should be similar, but not necessarily equal.

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## Visualizations

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## Matrix Statistics

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Size Type
1473 x 1473, 17857 entries real symmetric positive definite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
34241 1473 16384 16384 0
Column Data Row Data
Average nonzeros per column : 23
Standard deviation : 6.7

index nonzeros 55 33 9 2

Average nonzeros per row : 23
Standard deviation : 6.7

index nonzeros 55 33 9 2

Bandwidths Profile Storage
 lower upper 651 651 62 130
minmaxave.std.dev.
lower bandwidth1 651 92 1.5e+02
upper bandwidth1 651 92 1.5e+02

Symmetric skyline storage requirement:135219

Heaviest diagonals
 offset from main nonzeros accumulated percent 0 -1 1 -2 2 -3 3 -51 51 -50 1473 1235 1235 1170 1170 1158 1158 969 969 836 4.3 7.91 11.52 14.93 18.35 21.73 25.11 27.94 30.77 33.21

Top 10 out of 181 nonvoid diagonals.
Conditioning
 Frobenius norm condition number (est.) 4.7e+09 5.3e+08 6.6e+08 no

## Set Information

Set BCSSTRUC1
Source: John Lewis, Boeing Computer Services, Seattle, Washington, USA
Discipline:Dynamic analyses in structural engineering
Accession:Summer 1982

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