BCSSTK27: BCS Structural Engineering Matrices (eigenvalue problems and linear equations)
Buckling analysis, symmetric half of engine inlet from Boeing jetliner

from set BCSSTRUC4, from the Harwell-Boeing Collection

From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM27 from BCSSTRUC4 set.

Download as

Compressed MatrixMarket format file: bcsstk27.mtx.gz (337511 bytes)
Compressed Harwell-Boeing format file: bcsstk27.rsa.gz (273551 bytes)

Visualizations

Click on image to get an enlarged version. Click on label to get an explanation.

Structure Plot	City Plot

Matrix Statistics

Size	Type
1224 x 1224, 28675 entries	real symmetric positive definite
Nonzeros
total diagonal below diagonal above diagonal A-A' 56126 1224 27451 27451 0
Column Data	Row Data
Average nonzeros per column : 46 Standard deviation : 9.8 index nonzeros longest 62 54 shortest 1 15	Average nonzeros per row : 46 Standard deviation : 9.8 index nonzeros longest 62 54 shortest 1 15
Bandwidths	Profile Storage
lower 57 upper 57 average |i-j| 24 std.dev. 15	min max ave. std.dev. lower bandwidth 1 57 41 6.6 upper bandwidth 1 57 41 6.6 Symmetric skyline storage requirement:50515
Heaviest diagonals
offset from main 0 -1 1 -34 -2 2 34 -35 -33 33 nonzeros 1224 1188 1188 1152 1152 1152 1152 1118 1118 1118 accumulated percent 2.18 4.30 6.41 8.47 10.52 12.57 14.62 16.62 18.61 20.60 Top 10 out of 113 nonvoid diagonals.
Conditioning
Frobenius norm 2.1e+07 condition number (est.) 7.7e+04 2-norm (est.) 3.5e+06 diagonal dominance no

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Last change in this page: Wed Sep 22 13:33:27 US/Eastern 2004 [Comments: ]