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BCSSTM12: BCS Structural Engineering Matrices (eigenvalue matrices)
Ore car -- consistent mass

from set BCSSTRUC1, from the Harwell-Boeing Collection

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From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix M; matrix K is BCSSTK12 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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Matrix Statistics

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Size Type
1473 x 1473, 10566 entries real symmetric positive semi-definite
totaldiagonalbelow diagonalabove diagonalA-A'
19659 1473 9093 9093 0
Column Data Row Data
Average nonzeros per column : 13
Standard deviation : 5.2

longest55 22
shortest9 2

Average nonzeros per row : 13
Standard deviation : 5.2

longest55 22
shortest9 2

Bandwidths Profile Storage
lower650 upper650
average |i-j|63
lower bandwidth1 650 91 1.5e+02
upper bandwidth1 650 91 1.5e+02

Symmetric skyline storage requirement:134315

Heaviest diagonals
offset from main0 -3 3 -51 51 -48 48 -54 54 -1
nonzeros1473 1101 1101 969 969 772 772 757 757 483
accumulated percent 7.4913.0918.6923.6228.5532.4836.4140.2644.1146.56

Top 10 out of 159 nonvoid diagonals.
Frobenius norm82 condition number (est.)8.9e+05
2-norm (est.)13 diagonal dominanceno

Set Information

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

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Last change in this page: Wed Sep 22 13:33:24 US/Eastern 2004 [Comments: ]