MODEWEIGHT - Optimization Parameter
The MODEWEIGHT command can be used in the Subcase Information section to define a multiplier for computed eigenvalues that are to be used in the calculation of the "weighted reciprocal eigenvalue" and "combined compliance index" optimization responses.
MODEWEIGHT (mode) = weight
Argument |
Description |
|
mode |
Mode number. No default (0 < Integer < highest calculated mode) |
|
weight |
The multiplier to be used for the corresponding mode in the calculation of "weighted reciprocal eigenvalue" or "combined compliance index." Default = 1.0 (Real) |
OptiStruct will terminate with an error if no mode number is provided.
Modes for which there is no MODEWEIGHT definition are not included in the calculation of the "weighted reciprocal eigenvalue" and "combined compliance index" optimization responses.
Please refer to the Responses page of the User's Guide for more information on "weighted reciprocal eigenvalue" and "combined compliance index" optimization response calculations.
MODEWEIGHT is only used in conjunction with DRESP1, RTYPE = WFREQ, COMB.
If there is no MODEWEIGHT defined, but a DRESP1 with RTYPE = WCOMP exists, the following default is applied:
· MODEWEIGHT (1) = 1.0 in most cases for topology optimization.
· MODEWEIGHT (7) = 1.0 if no SPC is defined for the subcase, EIGRL does not define a V1 > 0.0, and it is solving for more than 6 modes or all modes below an upper bound.
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Alphabetical List of Subcase Information Entries