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Error 557 : DRESP2 3 is not referenced from within a structural eigenvalue SUBCASE

User: "FabioC"
FabioC
Altair Community Member
Updated by FabioC

Hello,

 

I am trying to run a single-objective topology optimsation (min compliance) with a user-defined constraint, which is a combination of compliance and eigenfrequency.

I did as follow:

1. Created two loadsteps. Linear static and normal modes.

2. Created two responses (DRESP1): compliance and first eigenfrequency, each one associated to the corresponding loadstep.

3. Defined a DEQUATION for the user-defined constriant.

4. Created a new response (type = function) pointing to the dequation and edited the associated responses before creating it.

5. Created a DCONSTRAINT for the response at point 4.

6 Created an objective for compliance.

 

When I launch the optimisation I receive the error message below.

 

 *** ERROR # 557 ***
 DRESP2 3 is not referenced from within a structural eigenvalue SUBCASE.
 This type of response must be specified from within a structural eigenvalue 
 SUBCASE.
 This error occurs in DESSUB 3.

 

I have found a couple of similar posts on the forum but still unable to fix it. Could anyone provide some hints to solve this error please?

Thank you

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