DOPTPRM, BARCON

Bulk Data Entry Controls the internal constraints of PBARL and PBEAML properties during optimization.

Definitions

Parameter Values Description
BARCON <REQUIRED or EXTENDED>
REQUIRED (Default)
A required set of constraints are applied. This option prevents situations that are geometrically infeasible. This option is usually sufficient (and is the default), provided that positive lower bounds are specified on the design variables corresponding to the bar dimensions.
EXTENDED
Applies an extended set of constraints. This option also enforces positive dimensions (constrains the various dimensions of the properties to be greater than zero) in addition to the set of constraints applied by the REQUIRED option.

1. REQUIRED is usually sufficient (and is the default), provided that positive lower bounds are specified on the design variables corresponding to the bar dimensions. However, if such positive lower bounds are not set, the EXTENDED option can be used, which may introduce a large number of constraints with minimal benefit.
2. Example:
For PBARL/PBEAML (TYPE=BOX), you have the following constraint options:
REQUIRED
DIM1 > 2*DIM4 and DIM2 > 2*DIM3
EXTENDED
DIM3 > 0 and DIM4 > 0 (in addition to constraints defined by REQUIRED)