DOPTPRM, MAX_BUCK

Bulk Data Entry Controls maximum number of buckling eigenvalues to be considered for each buckling subcase in the optimization problem.

Definitions

Parameter	Values	Description
`MAX_BUCK`	<Integer > 0> Default = 15	Can only exist if DOPTPRM, GBUCK exists. Only up to `MAX_BUCK` eigenvalues are considered for each buckling subcase. If the user-defined `MAX_BUCK` is less than 15 when auto screening is turned on, `MAX_BUCK` will be reset to 15. If more buckling modes need to be involved for a problem, explicitly specify `MAX_BUCK` (`MAX_BUCK`>15). To reduce the computational cost, OptiStruct automatically and dynamically adjusts the upper bound of the eigenvalue range on the EIGRL card for each buckling subcase at each iteration and only the eigenvalues that are possibly retained in the optimization would be calculated.

Parameter

Values

Description

MAX_BUCK

Default = 15

Can only exist if DOPTPRM, GBUCK exists.

Only up to MAX_BUCK eigenvalues are considered for each buckling subcase.

If the user-defined MAX_BUCK is less than 15 when auto screening is turned on, MAX_BUCK will be reset to 15. If more buckling modes need to be involved for a problem, explicitly specify MAX_BUCK (MAX_BUCK>15). To reduce the computational cost, OptiStruct automatically and dynamically adjusts the upper bound of the eigenvalue range on the EIGRL card for each buckling subcase at each iteration and only the eigenvalues that are possibly retained in the optimization would be calculated.