Normally, the update method suggested in Svanberg (1987) is stable. However, if the design responses are very sensitive, it is suggested to use a more conservative update method that requires more optimization iterations. The update strategy is changed using the parameter DENSITY_UPDATE. The default value of DENSITY_UPDATE is NORMAL. Setting DENSITY_UPDATE to CONSERVATIVE leads to a conservative update of the design variables: OPT_PARAM ID_NAME = opt_params OPTIMIZE = id_of_optimize DENSITY_UPDATE = CONSERVATIVE END_ Note: It is recommended to use the conservative update method if it is problematic to fulfill the constraints used in the optimization formulation. The user also has the possibility to use a more aggressive update of the design variables in order to reduce the number of optimization iterations by setting DENSITY_UPDATE to AGGRESSIVE: OPT_PARAM ID_NAME = opt_params OPTIMIZE = id_of_optimize DENSITY_UPDATE = AGGRESSIVE END_
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