DMIGMOD

Bulk Data Entry Defines changes in the contents of a super element from H3DDMIG input.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
DMIGMOD	`MTXNAME`	`SHFGID`	`SHFSPID`	`SHFSPID_F`	`SHFCID`	`SHFEID`	`SHFRID`
	`HYBDAMP`	`METHOD`	`SDAMP`	`KDAMP`	`METHOD_F`	`SDAMP_F`	`KDAMP_F`
	`ORIGIN`	`A1`	`A2`	`A3`
	`GIDMAP`	`GID1`	`GID1A`	`GID2`	`GID2A`	`GID3`	`GID3A`
	`CIDMAP`	`CID1`	`CID1A`	`CID2`	`CID2A`	`CID3`	`CID3A`
	`RELOC`	`PA1`	`PA2`	`PA3`	`PB1`	`PB2`	`PB3`
	`GRDTOL`	`ERREXT`	`TOLEXT`	`ERRINT`	`TOLINT`

Definitions

Field	Contents	SI Unit Example
`MTXNAME`	Matrix name defined on ASSIGN,H3DDMIG. No default (1 to 6 characters)
`SHFGID`	All Grid identification numbers in the superelement are shifted by the specified value. If this field is left blank, then a shift does not occur. 2 Default = blank (Integer or blank)
`SHFSPID`	All SPOINT identification numbers in the superelement are shifted by the specified value. If this field is left blank, then a shift does not occur. 2 Default = blank (Integer or blank)
`SHFSPID_F`	All Fluid SPOINT identification numbers in the superelement are shifted by the specified value. If this field is left blank, then a shift does not occur. 2 Default = blank (Integer or blank)
`SHFCID`	All Coordinate System identification numbers in the superelement are shifted by the specified value. If this field is left blank, then a shift does not occur. 2 Default = blank (Integer or blank)
`SHFEID`	All Element identification numbers in the superelement are shifted by the specified value. If this field is left blank, then a shift does not occur. 2 Default = blank (Integer or blank)
`SHFRID`	All Rigid Element identification numbers in the superelement are shifted by the specified value. If this field is left blank, then a shift does not occur. 2 Default = blank (Integer or blank)
`HYBDAMP`	Keyword for the remaining data for superelement damping.
`METHOD`	EIGRL card identification number. Hybrid damping would be applied on the superelements for the modes referred by EIGRL card. If blank, then applied damping on all the modes. Default = blank (Integer > 0, or blank)
`SDAMP`	Identification number of TABDMP1 entry for modal damping. No default (Integer > 0)
`KDAMP`	-1 Viscous modal damping is entered into the complex stiffness matrix as structural damping instead of viscous damping. Default = 1 (Integer)
`METHOD_F`	EIGRL card identification number. Hybrid damping would be applied on the fluid part of superelement for the modes referred by the EIGRL card. If blank, then modal damping is applied damping to all the fluid modes.
`SDAMP_F`	Identification number of TABDMP1 entry for fluid modal damping of the superelement. No default (Integer > 0)
`KDAMP_F`	-1 Viscous modal damping is entered into the complex stiffness matrix as structural damping instead of viscous damping. Default = 1 (Integer)
`ORIGIN`	Keyword for defining the new `ORIGIN` for DMIG.
`A1`, `A2`, `A3`	Defines the new location of the origin of the DMIG. Default = 0.0 (Real)
`GIDMAP`	Keyword for defining mapped grid ID pairs.
`GIDn`, `GIDnA`	Mapped grid ID pairs.
`CIDMAP`	Keyword for defining mapped coordinate system ID pairs.
`CIDn`, `CIDnA`	Mapped coordinate system ID pairs.
`RELOC`	Keyword indicating that matching grid point ID pairs in the residual structure and superelement are to follow. 1
`PA1`, `PA2`, `PA3`	ID's of three non-collinear grid points in the residual structure.
`PB1`, `PB2`, `PB3`	ID's of three non-collinear grid points in the superelement that will be matched to corresponding grid points in the residual structure (defined by `PA1`, `PA2` and `PA3`).
`GRDTOL`	Indicates that the grid point tolerance settings between matching residual and superelement grids are to follow.
`ERREXT`	Specifies whether OptiStruct will: ERROR (Default) Errors out. WARN Outputs a warning for inconsistent exterior grid locations based on a defined tolerance value (`TOLEXT`).
`TOLEXT`	Tolerance value to compare exterior grid locations. Default = 1.0e-15
`ERRINT`	Specifies whether OptiStruct will: ERROR (Default) Errors out. WARN Outputs a warning for inconsistent exterior grid locations based on a defined tolerance value (`TOLEXT`).
`TOLINT`	Tolerance value to compare interior grid locations. Default = 1.0e-5

Comments

The RELOC entry and its related fields define three matching grid point pairs on the residual structure and the superelement. The superelement defined using ASSIGN, H3DDMIG is relocated (translated and rotated, as required) such that the three non-collinear grids PB1, PB2, and PB3 coincide with PA1, PA2, and PA3, respectively on the residual structure.

Figure 1.
Identification numbers of certain entities in a superelement can be modified during H3DDMIG input. Negative integers can be input in the shift fields on this entry (see fields beginning with 'SHF' above), however, care should be taken to ensure that the identification numbers are not shifted to negative values. The values of identification numbers after shifting should always be greater than zero, otherwise, the run will error out.
The use-case of GIDMAP is to renumber the interface grids IDs such that they match with the IDs used in the residual structure. Also, renumbering interior grids IDs such that they do not conflict with exterior grids or with interior grids in another superelement. For the latter use-case, SHFGID will also be used to avoid the conflict. If both GIDMAP and SHFGID are used together for the same superelement, the renumbered grids with GIDMAP will not be renumbered again by SHFGID.