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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 
malcolmdinovitzer

Negative or Large Compliance

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Hello,

I am attempting to run an optimization using Optistruct but the solver keeps outputting the following error:

 

            *** ERROR # 312 ***
            In static load case 1
            the compliance is negative or large 1.7638e+015.
            Optimization/buckling analysis cannot be performed.
            due to possible rigid body mode.
            INFEASIBLE DESIGN (AT LEAST ONE CONSTRAINT VIOLATED).

 

From what I understand, this error could be from a model that is not fully constrained or from poorly defined materials properties. My model is constrained with 2 RBE3 elements so I believe my constraints are not the issue and I don't understand what could be wrong with my material inputs. 

 

I have attached my model for reference. Any help would be appreciated

 

Thanks

ComparisonStudyModel.hm

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