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Title
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An Iterative Method In Dynamic Stroctoral Analyses With Nonproportional Damping
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Report Number
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WL-TR-91-3078 Volume III, p. JCB-1 thru JCB-17
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Creator
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Tsai, Wan T.
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Leang, Joseph T.
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Corporate Author
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MTS, Dynamic Loads, Rockwell International
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Date
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1991
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Date Issued
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1991-08
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Extent
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17
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Identifier
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ADA241313
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Format
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1 online resource
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Abstract
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A new method in dynamic analyses of structures with nonproportional
damping is proposed. By decomposing the nonproportional
damping matrix into two portions, the diagonal and offdiagonal,
the iterative technique can be employed through use of the
classic method of solving a large dynamic structural system with
real modal coordinates. Explicitly, the diagonalized damping matrix
is retained to form a system of discrete differential equations with
proportional damping. The off-diagonal portion of damping forces is
treated as a correcting forcing function. The iteration is to use
the off-diagonal damping induced forces for the load correction in
the subsequent computational step. This enables the structural
responses to be simply determined while the effect of off-diagonal
damping forces is included.
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Description
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A new method in dynamic analyses of structures with nonproportional
damping is proposed. By decomposing the nonproportional
damping matrix into two portions, the diagonal and offdiagonal,
the iterative technique can be employed through use of the
classic method of solving a large dynamic structural system with
real modal coordinates. Explicitly, the diagonalized damping matrix
is retained to form a system of discrete differential equations with
proportional damping. The off-diagonal portion of damping forces is
treated as a correcting forcing function. The iteration is to use
the off-diagonal damping induced forces for the load correction in
the subsequent computational step. This enables the structural
responses to be simply determined while the effect of off-diagonal
damping forces is included.
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Distribution Classification
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1
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Distribution Conflict
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No
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DTIC Record Exists
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No
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Illinois Tech Related
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No
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Photo Quality
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Not Needed
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Report Availability
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Full text available
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Type
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article
articleJCB