Optimization min(BeadFraction) whit DCON(frf erp)

Rahul_P1

Hi all,

i set up an Topografi optimization in HM for Optistruct. The objective is to minimize the beadfraction. As constraint I uses frf erp form my frequResponse loadstep. The analysis is running.

Some rows of the inputDeck:

--------------------------------------------------------------
DESOBJ(MIN)=2
SUBCASE 2
LABEL Frequenzanregung
ANALYSIS MFREQ
SPC = 5
METHOD(STRUCTURE) = 1
RESVEC(APPLOAD) = NO
FREQUENCY = 9
SDAMPING(STRUCTURE) = 100
DLOAD = 7
ACCELERATION(PUNCH,PHASE) = 1
ERP(PUNCH) = ALL
OLOAD(PUNCH) = 1
DESSUB = 2

BEGIN BULK
SET 1 GRID LIST
+ 127062
SET 3 ELEM LIST
+ 161291 145099 145100 145101 145102 145103 145104 145105

PANELG 4PANAL_Au ERP 3

DTPG 1PSHELL 1
+ 8.0 60.0 YES 7.0 NORM BOTH
+ BOUNDS 0.0 1.0
DRESP1 2 RES2_BeaBEADFRAC COMB
DRESP1 1 RES1_ERPFRERP AVG 4
DCONSTR 1 1 60000.0

DCONADD 2 1

The optimization starts but the defined constraint is not recognized!?!?
Where is the problem?

Rahul_P1

Hi Fliffer,

I can see the constraint is added in DCONSTR. DCONSTR 1 1 60000, refers to DRESP1 which is a FRERP with a lower bound of 60000.