How do I calculate the NORM factor for a combined compliance and frequency optimization problem?
If the value of the subcase information entry NORM is left as 0.0 (default), then the normalization factor is estimated during the zero-th (analysis only) iteration of the optimization run (such that the static compliance and weighted frequencies are equally weighted). If you provide a value other than 0.0, that value will be used in the optimization. In HyperMesh, the value of NORM may be defined in the response panel when the “response type” is comb. The normalization factor (NORM) is used for normalizing the contributions of static load case compliances and the inverse of eigenvalues when using the combined compliance index as the objective function. A typical structural compliance value is on the order of 1.e4 to 1.e6. However, a typical inverse eigenvalue, as in the case of using the combined compliance index as the objective function, is on the order of 1.e-5. If NF is not used, the linear static compliance requirements dominate the solution. Please refer to the Responses page of
