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DOPTPRM, LATTICE (Not Supported in 14.0 or Later Versions)

DOPTPRM, LATTICE (Not Supported in 14.0 or Later Versions)

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DOPTPRM, LATTICE (Not Supported in 14.0 or Later Versions)

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Parameter

Values

Description

LATTICE

<YES, NO>

Default = YES

For Lattice Optimization, the application of the Stress NORM method for stress constraint calculation, the beam cleaning process, and the application of Euler Buckling constraints in the second phase are controlled by this parameter.

YES (default) – Turns ON the application of the Stress NORM method for stress constraint calculation, the beam cleaning process, and the application of Euler Buckling constraints in the second phase.

NO – Turns OFF the application of the Stress NORM method for stress constraint calculation, the beam cleaning process, and the application of Euler Buckling constraints in the second phase.

Note

1.At the end of phase 1, the parameter DOPTPRM, LATTICE is automatically set to YES. Further modification of this parameter is not recommended. If you reset this parameter to NO, the stress NORM method is not applied in the handling of stress constraints in the second phase (also beam cleaning and Euler Buckling constraints are deactivated). This can possibly lead to a slow optimization run or maybe even termination of the program with an “Optimization problem is too large” error. The usage of Stress NORM improves efficiency of the handling of stress constraints in the second phase so it is recommended to retain the LATTICE parameter set to YES.
2.Additionally, if this parameter is reset to NO, Euler Buckling constraints are deactivated. Consequently, the buckling performance of the final optimized structure may possibly be poor.

Refer to Stress Constraints in the User’s Guide for further information.