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How do I specify damping in a dynamic analysis?
Damping properties are typically specified
as part of the material attribute definition and so may
be defined separately for different sections of the structure.
Damping is input using Rayleigh damping parameters.
Search the online help for "Defining
Damping Properties" to find more information on the
use of damping properties in Modeller.
Search for "2.4.3 Damping" in
the Modeller to read a description of the Rayleigh damping
method that is used. The calculation of the damping coefficients
may be performed readily in a spreadsheet.
It is possible to request distributed damping
values across the frequency range of interest. This is most
easily performed by invoking the "Include Modal Damping"
facility on the Eigenvalue Control form (Load Case Properties).
Select "Set Damping..." and click HELP for more
information. Note that this command produces an additional
section in the LUSAS output file in which the damping factors
for each requested eigenvalue are also output.
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