Rayleigh Damping Command: Difference between revisions
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'''D = $alphaM * M + $betaK * Kcurrent +$betaKinit * Kinit + $betaKcomm * KlastCommit''' | '''D = $alphaM * M + $betaK * Kcurrent +$betaKinit * Kinit + $betaKcomm * KlastCommit''' | ||
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Code Developed by: <span style="color:blue"> fmk </span> | Code Developed by: <span style="color:blue"> fmk </span> | ||
Revision as of 23:38, 25 March 2010
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This command is used to assign damping to all previously-defined elements and nodes. When using rayleigh damping in OpenSees, the damping matrix for an element or node, D is specified as a combination of stiffness and mass-proportional damping matrices:
D = $alphaM * M + $betaK * Kcurrent +$betaKinit * Kinit + $betaKcomm * KlastCommit
| rayleigh $alphaM $betaK $betaKinit $betaKcomm |
| $nodeTag | integer tag identifying node |
| $alphaM | factor applied to elements or nodes mass matrix |
| $betaK | factor applied to elements current stiffness matrix. |
| $betaKinit | factor applied to elements initial stiffness matrix. |
| $betaKcomm | factor applied to elements committed stiffness matrix. |
NOTE:
The command overwrites any existing damping coeeficients at the Elements and Nodes.
EXAMPLE:
rayleigh 0.01 0.02 0.0 0.0
Code Developed by: fmk