nd308
New member
- Mar 14, 2012
- 3
Hi,
I am trying to optimize a wing for weight with regard to three very simple sub-cases:
SUBCASE 1
ANALYSIS = STATICS
LOAD = 103050
DESSUB = 6
SUBCASE 2
ANALYSIS = STATICS
LOAD = 103060
DESSUB = 6
SUBCASE 3
ANALYSIS = BUCK
METHOD = 10 $Lanczos eigenvalue extraction
DESSUB = 5
DISP = ALL
I am only interested in the wing and the rest of the A/C is represented by RBE2s and CONM2s. The constraints are placed at the nose
SPC1 111 1246 33333
SUPORT 33333 35
Constrained in x,y,Rx and Rz with reactions in z and ry.
The constraints on each of the two statics sub cases are just material strain constraints and tip-deflection constraints. Nothing fancy. For the buckling sub cases, the only constraint is that the first buckling mode should be greater than one. Again nothing fancy there.
The static load cases are simply gravity cases where normal gravity is increased by a factor 2 and 3 respectively and responses are wanted for these two sub cases.
But for inexplicable reason I keep getting this error:
^^^ USER ACTION: CONSTRAIN MECHANISMS WITH SPCI OR SUPORTI ENTRIES OR SPECIFY PARAM,BAILOUT,-1 TO
CONTINUE THE RUN WITH MECHANISMS.
Suffice to say I have tried PARAM,BAILOUT,-1 but it does not work. I have spent most part of this day trying to get it to work, but with little success.
Could anyone share some insight into what it is that is going wrong?
I am trying to optimize a wing for weight with regard to three very simple sub-cases:
SUBCASE 1
ANALYSIS = STATICS
LOAD = 103050
DESSUB = 6
SUBCASE 2
ANALYSIS = STATICS
LOAD = 103060
DESSUB = 6
SUBCASE 3
ANALYSIS = BUCK
METHOD = 10 $Lanczos eigenvalue extraction
DESSUB = 5
DISP = ALL
I am only interested in the wing and the rest of the A/C is represented by RBE2s and CONM2s. The constraints are placed at the nose
SPC1 111 1246 33333
SUPORT 33333 35
Constrained in x,y,Rx and Rz with reactions in z and ry.
The constraints on each of the two statics sub cases are just material strain constraints and tip-deflection constraints. Nothing fancy. For the buckling sub cases, the only constraint is that the first buckling mode should be greater than one. Again nothing fancy there.
The static load cases are simply gravity cases where normal gravity is increased by a factor 2 and 3 respectively and responses are wanted for these two sub cases.
But for inexplicable reason I keep getting this error:
^^^ USER ACTION: CONSTRAIN MECHANISMS WITH SPCI OR SUPORTI ENTRIES OR SPECIFY PARAM,BAILOUT,-1 TO
CONTINUE THE RUN WITH MECHANISMS.
Suffice to say I have tried PARAM,BAILOUT,-1 but it does not work. I have spent most part of this day trying to get it to work, but with little success.
Could anyone share some insight into what it is that is going wrong?
