DLINK2

Bulk Data Entry Defines a link of one design variable to one or more other design variables defined by a DEQATN card. The equation inputs come from the referenced DESVAR values and the constants defined on the DTABLE card.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
DLINK2	`ID`	`DDVID`	`EQUID` or `FUNC`
	`DESVAR`	`DVID1`	`DVID2`	`DVID3`	`DVID4`	`DVID5`	`DVID6`	`DVID7`
		`DVID8`	`DVID9`	etc.
	`DTABLE`	`LABL1`	`LABL2`	`LABL3`	`LABL4`	`LABL5`	`LABL6`	`LABL7`
		`LABL8`	etc.

Example

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
DLINK2	201	7	101
	DESVAR	5	6

Associated Cards

(1)	(2)	(3)	(4)	(5)	(6)
DESVAR	5	X	0.0	-1.0	1.0
DESVAR	6	Y	0.0	-1.0	1.0
DESVAR	7	R	0.0	-1.0	1.0
DEQATN	101	RADIUS(X,Y) = SQRT(X2+Y2)

Definitions

Field	Contents	SI Unit Example
`ID`	Relationship identity. Each DLINK2 entry should have a unique ID. No default (Integer > 0)
`DDVID`	Dependent Design Variable identification number. (Integer > 0)
`EQID`	Equation ID of DEQATN data. No default (Integer > 0)
`FUNC`	Function to be applied to the arguments.2 (Character)
`DESVAR`	Indicates DESVAR ID numbers follow.
`DVIDi`	DESVAR ID. No default (Integer > 0)
`DTABLE`	Indicates DTABLE labels follow.
`LABLi`	Constant label on DTABLE card. No default (Character)

Comments

The main application for this entity is to link shape design variables with each other through equations. DVPREL2 should be used for linking sizing design variables with each other through equations.

The following functions can be used instead of an EQUID. If FUNC is used, the DEQATN entry is no longer needed. The functions are applied to all arguments on the DLINK2 regardless of their type.

Function	Description	Formula
SUM	Sum of arguments	$SUM (y_{1}, y_{2} \dots y_{m}) = \sum_{j = 1}^{m} y_{j}$
AVG	Average of arguments	$AVG (y_{1}, y_{2}, \dots y_{m}) = [\sum_{j = 1}^{m} y_{j}] / m$
SSQ	Sum of square of arguments	$SSQ (y_{1}, y_{2} \dots y_{m}) = \sum_{j = 1}^{m} y_{j}^{2}$
RSS	Square root of sum of squares of arguments	$RSS (y_{1}, y_{2} \dots y_{m}) = \sqrt{\sum_{j = 1}^{m} y_{j}^{2}}$
MAX	Maximum of arguments
MIN	Minimum of arguments
SUMABS	Sum of absolute value of arguments	$SUM (y_{1}, y_{2} \dots y_{m}) = \sum_{j = 1}^{m} \| y_{j} \|$
AVGABS	Average of absolute value of arguments	$AVG (y_{1}, y_{2} \dots y_{m}) = [\sum_{j = 1}^{m} \| y_{j} \|] / m$
MAXABS	Maximum of absolute arguments
MINABS	Minimum of absolute value of arguments
RMS	Root mean square value of arguments	$RMS (y_{1}, y_{2}, \dots, y_{m}) = \sqrt{\frac{1}{m} (\sum_{i = 1}^{m} y_{i}^{2})}$

This card is represented as an design variable link in HyperMesh.