Print option for line search details

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Does anybody know if there is a print option in OptiStruct to get more detailed information about the line search in the iterations (such as search direction, intermediate points, etc.)? Such an option is available in MSC Nastran und this is very helpful if an optimization doesn’t give proper results and to understand the reason for it

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Answers

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited May 2015

    Have you seen the output in the .out file and the HGHIST content files as shown below?

     

    Creation of the .hist file is controlled by the I/O Option DESHIS.

     

    HGHIST - Design history output presentation for HyperGraph.

     

    Files output - -

    *_hist.mvw,
    *.hist
    *.hgdata

     

    In the .out file 

     

    The Analysis Results or Optimization History information sections provide the following information (Some information is output for each iteration during optimization, or as a summary for nonlinear analysis):

    •Element quality information (If any of the warning or error limits are exceeded)

    •Global force balance tables for each linear static subcase. (When SPCFORCE or GPFORCE is a requested output).

    •Objective function value

    •Maximum constrain violation % and the ID of this constraint.

    •Design volume fraction value if topology design variables are present, otherwise the total volume is given, and the total mass.

    •Individual subcase compliances and weightings and the total weighted compliance.

    •Retained responses table

    If the constraint violation is higher than 1%, the constraint is flagged as V (violated). If the violation is lower than 1%, it is flagged as A (active). For stress constraint in topology optimization, if there is no violation, it is flagged as Inactive; otherwise, it is flagged as Active.

    •User-requested responses table (when RESPRINT or DREPORT is a requested output)

    •Most violated constraints table

    •Design variable values and bounds if shape or size design variables are present.

    •Designed property/material/connectivity items table if size design variables are present.

    •A list of calculated buckling modes and their eigenvalues.

    •A list of calculated normal modes, their frequencies, eigenvalues and weighting and the value of the frequencies weighted across the reciprocal eigenvalues.

    •Center of Gravity table

    •Moment of Inertia table

    •Regional compliance table

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