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I am trying to find some tutorials about multi-objective optimization by combining a "volfrac" and a "compliance" response in the DRESP2 "function" card. HS-4205 and HS-4425 ，these are not helpful to me.
flaecheopti_multiobjective.femHello, i was trying to make a multi-objective optimization by combining a "massfrac" and a "compliance" response in the dresp2 "function" card. Unfortunately I always get the following error message: A fatal error has been detected during input processing: *** ERROR # 557 *** DRESP2 3 is not referenced above the first SUBCASE. This type of response must be specified above the first SUBCASE. This error occurs in DESOBJ 3. I don't understand how I'm supposed to reference the dresp2 above the first subcase. The Hyperworks Help does not specify how to reference it above the subcase only that in some cases it is necessary. I tried to create the responses before creating the loadstep but that didn't solve it. I also tried to just cut+paste the objective section from the subcase information in the .fem-file infront of the loadstep section. But running the edited .fem-file from the command prompt didn't work either. Am I missing something here? The .fem-file is (hopefully) attached. Thanks for any helpful tip!