An Iterative Method In Dynamic Stroctoral Analyses With Nonproportional Damping

Item

Title
An Iterative Method In Dynamic Stroctoral Analyses With Nonproportional Damping
Report Number
WL-TR-91-3078 Volume III, p. JCB-1 thru JCB-17
Creator
Tsai, Wan T.
Leang, Joseph T.
Corporate Author
MTS, Dynamic Loads, Rockwell International
Date
1991
Date Issued
1991-08
Extent
17
Identifier
ADA241313
Format
1 online resource
Abstract
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.
Description
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.
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Photo Quality
Not Needed
Report Availability
Full text available
Type
article
Is Part Of
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)
Media
articleJCB

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Items with "Has Part: An Iterative Method In Dynamic Stroctoral Analyses With Nonproportional Damping"
Title Class
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)