Setting constraint to erp

Altair Forum User

hello all

 

I am defining optimisation to reduce erp by topology optimisation. My objective is to find optimum material distribution to have low erp

 

my defination goes as

 

dconstraint:

 

Erp: upper bound > (Target values) ####

Volumefrac= upperbound  0.3 design volume

 

objective= minimize design volume

 

Loadstep = Modal frequency Response.

 

###For this setup I get error selected subcase not compatible with type of response while setting constraint on ERP

 

how do i set the erp as target value.

 

Regards

Pratik

Altair Forum User

Hi Pratik,

 

could you please paste the exact error you get?

Altair Forum User

Load step:

 

Modal Frequency response analysis

 

Response type:

 

ERP  All freq

 

Dconstraints

 

erp : upperbound 0.2 , I am not able to set this.

 

#subcase not compatible with type of response

Altair Forum User

Pratik,

 

The following responses are supported for Topology optimization.

 

Mass

Volume

Volume or Mass Fraction

Center of Gravity

Moment of Inertia

Static Compliance

Static Displacement

Natural Frequency

von Mises Stress on Entire Model (only as constraint)

Buckling Factor (special case)

Frequency Response Displacement, Velocity, Acceleration

Temperature

Weighted Compliance

Weighted Frequency

Combined Compliance Index

Function

 

 

Altair Forum User

Funny it works at one instance and doesnt work in different instance although loadcase is same. I have sent you files through dropbox.

Altair Forum User

Hello

 

It is due to bug , when creating loadstep from panel browser. create load step from Horizontal Panel.

 

regards

Pratik

Altair Forum User

Hi Pratik,

 

That is a know issue.

 

Any how please check the compatible responses with topology optimization.