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Deformation Mode Damping

Theory

Specification of deformation mode damping allows you to define individual stiffness damping coefficients for each of the structure deformation modes, namely, axial, bending and torsion. When this option is invoked the damping matrix C is based on the linear stiffness matrix , the geometric stiffness matrix and the mass matrix , using the relation:

       (1)

where:

• , and are the stiffness proportional damping coefficients for the axial, bending and torsional modes, respectively. It is possible to specify different coefficients for bending about the element local-y and local-z axes.

•μ  is the mass proportional damping coefficient

•the superscripts Axial, Bending and Torsion as applied to the stiffness matrix terms indicate that these terms represent sub-matrices of the overall stiffness matrix comprising only axial, bending and torsion terms, respectively

Note that deformation mode damping is not available for frequency domain analysis.

Relevant Keywords

•*DAMPING is used to incorporate damping into a dynamic analysis.