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XDAMP |
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XDAMP |
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»Click here to display Table of Contents«
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XDAMP |
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XDAMP |
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Bulk Data Entry
XDAMP – Raleigh Damping for Geometric Nonlinear Dynamic Analysis
Description
Defines values for Raleigh damping for geometric nonlinear dynamic analysis.
Format
(1) |
(2) |
(3) |
(4) |
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(6) |
(7) |
(8) |
(9) |
(10) |
XDAMP |
DID |
GSID |
ALFA |
BETA |
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Field |
Contents |
DID |
Unique damping identification number. (Integer > 0) |
GSID |
Grid set identification number. Damping is applied to the grid points in this set. Default = all grids in the model (blank or Integer > 0) |
ALFA |
Factor for the stiffness matrix contribution. (Real > 0) |
BETA |
Factor for the mass matrix contribution. (Real > 0) |
| 1. | Rayleigh damping is applied to all geometric nonlinear dynamic analysis subcases, implicit and explicit. It is ignored in all other subcases. |
| 2. | In implicit dynamic analysis damping is applied to all grid points and GSID is ignored. Multiple XDAMP is not allowed in implicit dynamic analysis. |
| 3. | XDAMP and PARAM W3/G are mutually exclusive. |
| 4. | Grid sets in all XDAMP statements must contain unique sets of grid points. |
| 5. | The viscous damping matrix B is calculated from the mass matrix M and stiffness matrix K using: |
B = ALFA * M + BETA * K
| 6. | This card is represented as an interface in HyperMesh. |
See Also:
