I am doing topology optimization using Optistruct. I set up the problem in the form of minimizing the Weighted Compliance with volume constraint, since I have several loadsteps. Right now, I am trying to do some manipulations on each of the individual Compliance to set up the new objective function using external response by HyperMath. I use the DRESP3 card to achieve that. The problem is that I can only get access to the summation of all the Weighted Compliance instead of each of them individually. Are there any way to get access to the individual Compliance?
For example, I want to get the individual Compliance of Subcase 1 and 2 and do some manipulations as the objective function, such as C1^2+C2^2, not the summation of them.
ITERATION 4
Objective Function (Minimize EXTER) = 3.32436E+06 % change = 15.66
Maximum Constraint Violation % = 0.54462E-03
Design Volume Fraction = 3.00002E-01 Mass = 0.00000E+00
Subcase Weight Compliance Weight*Comp.
1 1.000E+00 1.478572E+06 1.478572E+06
2 1.000E+00 1.835716E+05 1.835716E+05
3 1.000E+00 1.478658E+06 1.478658E+06
4 1.000E+00 1.835621E+05 1.835621E+05
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Sum of Weight*Compliance 3.324364E+06
RETAINED RESPONSES TABLE
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Response Type Response Subcase Grid/ DOF/ Response Objective Viol.
User-ID Label /RANDPS Element/ Comp Value Reference/ %
+Frqncy MID/PID/ /Reg Constraint
Mode No. Bound
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11 EXTER SUMH -- -- 1 3.324E+06 MIN
1 VOLFR VF -- -- TOTL 3.000E-01 < 3.000E-01 0.0 A
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