# 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:
${\mathit{MP}}_{i}={C}_{0}+\sum _{i}{\mathit{COEF}}_{i}\cdot {\mathit{DVID}}_{i}$
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:
${\mathit{MP}}_{i}={C}_{0}+\sum _{i}{\mathit{COEF}}_{i}\cdot {\mathit{DVID}}_{i}$
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:
${P}_{i}=C0+\sum _{i}{\mathit{COEF}}_{i}*{\mathit{DDVI}}_{i}$
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. |