Design Variable Property Relationships

Design variable property relationship entities define relationships between design variables and properties for optimization problems.

Design variable property relationships do not have a display state in the modeling window.

Nastran Cards

Card Description
DVCREL1 Defines the relation between a connectivity property and design variables.
Note: Generic Property
DVCREL2 Defines the relation between a connectivity property and design variables with a user-supplied equation.
DVMREL1 Defines the relation between a material property and design variables.
DVMREL2 Defines the relation between a material property and design variables with a user-supplied equation.
DVPREL1 Defines the relation between an analysis model property and design variables.
Note: Generic Property
DVPREL2 Defines the relation between an analysis model property and design variables with a user-supplied equation.
Note: Function Property

OptiStruct Cards

Card Description
DVCREL1 Linearly relates a design variable to an analysis model element property using the equation: MP i = C 0 + i COEF i DVID i

CBAR, CELAS2, CELAS4, CMASS2, CMASS4, CDAMP2, CDAMP4, CONM1, CONM2, CONROD, CQUAD4, CTRIA3, CQUAD8, CTRIA6 elements can be selected.

Note: Bulk Data Entry
DVCREL2 Relates design variables to an analysis model element property using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and constants defined on a DTABLE card.

CBAR, CELAS2, CELAS4, CMASS2, CMASS4, CDAMP2, CDAMP4, CONM1, CONM2, CONROD, CQUAD4, CTRIA3, CQUAD8, CTRIA6 elements can be selected.

Note: Bulk Data Entry
DVLREL1 Linearly relates a design variable to an analysis model element.
DVLREL2 Relates a design variable to an analysis model loading using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and the constants defined on the DTABLE card.
DVMREL1 Linearly relates a design variable to an analysis model material property using the equation: MP i = C 0 + i COEF i DVID i

MAT1, MAT2, MAT8 and MAT9 materials can be selected.

Note: Bulk Data Entry
DVMREL2 Relates design variables to an analysis model material property using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and constants defined on a DTABLE card.

MAT1, MAT2, MAT8 and MAT9 materials can be selected.

Note: Bulk Data Entry

Requires a dequation definition.

DVPREL1 Linearly relates a design variable to an analysis model property using the equation: P i = C 0 + i COEF i * DDVI i

PBAR, PBARL, PBEAM, PBEAML, PBUSH, PCOMP, PCOMPG*, PCOMPP, PDAMP, PELAS, PMASS, PROD, PSHEAR, PSHELL, PVISC properties and PLY entities can be selected.

Note: Bulk Data Entry

For PCOMPG, either global plies or property specific plies may be selected.

DVPREL2 Relates a design variable to an analysis model property using a relationship defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and the constants defined on the DTABLE card.

PBAR, PBARL, PBEAM, PBEAML, PBUSH, PCOMP, PCOMPG*, PCOMPP, PDAMP, PELAS, PMASS, PROD, PSHEAR, PSHELL, PVISC properties and PLY entities can be selected.

Note: Bulk Data Entry

Requires a dequation definition.

For PCOMPG, either global plies or property specific plies may be selected.