The Include geometric nonlinearity check box and Mesh Selection are described in Common Study Step Settings. There is also detailed information in the Physics and Variables Selection and Values of Dependent Variables sections.
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Frequency (the default setting) to use the parameter values without modification.
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Fraction to multiply the parameter values by the absolute value of the largest eigenvalue in the reduced model divided by two.
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Spread to treat the parameter values as an interval around each eigenvalue in the reduced model. That is, the absolute value of each eigenvalue is multiplied by the parameter values and the resulting parameter value vectors are concatenated into one.
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With the Structural Mechanics Module, see Various Analyses of an Elbow Bracket, Application Library path Structural_Mechanics_Module/Tutorials/elbow_bracket.
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