These matrices were extracted from the MCS/NASTRAN or Boeing ATLAS structural engineering programs by Randy Cigel, Roger Grimes, John Lewis, and Ed Meyer. These are five very large problems encountered in detailed modeling of structures. Because of their size only the matrix patterns have been included in the collection. Given just cause and a willingness to deal with matrices with over 300,000 entries in the lower triangle the numerical values can be obtained from either Roger Grimes or John Lewis (jglewis@redwood.rt.cs.boeing.com). The first problem is from a generalized symmetric eigenvalue problem; the pattern of the associated differential stiffness matrix is a subset of the pattern of the stiffness matrix.

Matrices in this set:

• BCSSTK29 (pattern symmetric indefinite, 13992 by 13992, 316740 entries), Buckling model of a Boeing 767 rear pressure bulkhead
• BCSSTK30 (pattern symmetric indefinite, 28924 by 28924, 1036208 entries), Statics module of an off-shore generator platform
• BCSSTK31 (pattern symmetric indefinite, 35588 by 35588, 608502 entries), Statics module of an automobile component
• BCSSTK32 (pattern symmetric indefinite, 44609 by 44609, 1029655 entries), Statics module of an automobile chassis
• BCSSTK33 (pattern symmetric indefinite, 8738 by 8738, 300321 entries), Statics module of a pin boss (part of an automobile steering mechanism)
  
  
• Download the entire set BCSSTRUC5 (single compressed file, 2443537 bytes).
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