/DSIZE

Optimization Keyword

/DSIZE – Design Variable for Free-Size Optimization

Description

Defines parameters for the generation of free-size design variables.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/DSIZE/dsize_ID
title
grpart_ID	THICK	STRES	MEMBSIZ	PATRN	PATREP	NGROUP	COMP

If THICK =1, read thickness definition: T0, T1

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
T0		T1

If STRESS =1, read stress constraint definition: MAXSTRS

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
MAXSTRS

If MEMBSIZ =1, read member size constraint definition: MINDIM

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
MINDIM

If PATRN =1, read pattern grouping constraint definition:

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
TYP	AID	XA		YA		ZA
	FIX	XF		YF		ZF
UCYC	SID	XS		YS		ZS

If PATREP = 1, read MASTER definitions for pattern repetition constraint:

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
ptrepCID
CAID	XCA		YCA		ZCA
CFID	XCF		YCF		ZCF
CSID	XCS		YCS		ZCS
CTID	XCT		YCT		ZCT

If PATREP = 2, read SLAVE definitions for pattern repetition constraint:

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
masterID	SX		SY		SZ
ptre[CID
CAID	XCA		YCA		ZCA
CFID	XCF		YCF		ZCF
CSID	XCS		YCS		ZCS
CTID	XCT		YCT		ZCT

If COMP > 0, read composite manufacturing constraints definition (COMP = number of definitions):

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
CTYP=1:
CTYP	LTMIN		LTMAX		GRSH3N	GRSH4N	LTEXC
CTYP=2:
CTYP	PTANGLE		PTMIN		PTMAX		GRSH3N	GRSH4N	PTEXC
CTYP=3:
CTYP	PPANGLE		PPMIN		PPMAX		GRSH3N	GRSH4N	PPEXC
CTYP=4:
CTYP	PMANGLE		PMMAN		GRSH3N	GRSH4N	PMEXC
CTYP=5:
CTYP	BANGLE1		BANGLE2
CTYP=6:
CTYP	CANGLE		CTHICK
CTYP=7:
CTYP	PDANGLE		PDTYP	PDMAX		GRSH3N	GRSH4N	PDEXC

If NGROUP > 0, read zone based free-sizing definition:

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
ETYP1	EGRP1
ETYP2	EGRP2
...	...

Field	Contents
dsize_ID	Free-size design variable identifier. (Integer > 0)
title	Title. (Character, maximum 100 characters)
grpart_ID	Part group identifier defining the design space. (Integer > 0)
THICK	Indicates if minimum and possibly maximum thickness values need to be defined. (Integer > 0) = 0: No = 1: Yes
T0	Minimum thickness. (Real > 0.0 or blank)
T1	Maximum thickness. (Real > 0.0 or blank)
STRESS	Indicates if von Mises stress constraint needs to be defined. (Integer) = 0: No = 1: Yes
MAXSTRS	Upper bound constraint on von Mises stress. No default (Real > 0.0)
MEMBSIZ	Active member size control flag. (Integer > 0) = 0: No = 1: Yes
MINDIM	Minimum diameter of members formed is specified. This field can be used to eliminate small members. It also eliminates checkerboard results. Default = No minimum member size control (Real > 0.0)
PATRN	Active pattern grouping flag. (Integer) = 0: No = 1: Yes
TYP	Pattern grouping type requested. Default = No pattern grouping (Integer) = 1: 1-plane symmetry = 2: 2-plane symmetry = 3: 3-plane symmetry = 10: Cyclic = 11: Cyclic with symmetry
AID	Variable pattern grouping anchor node identifier. (Integer > 0 or blank) If blank, the XA, YA, and ZA fields should not be blank.
XA, YA, ZA	Coordinates of the pattern grouping anchor point. (Real or blank) If blank, AID should not be blank.
FID	Node identifier that defines the direction of the first vector for variable pattern grouping. (Integer > 0 or blank) If blank, the XF, YF, and ZF fields should not be blank.
XF, YF, ZF	Components of the first vector that defines pattern grouping. (Real or blank) If blank, FID should not be blank.
UCYC	Number of cyclical repetitions for cyclical symmetry. This field defines the number of radial "wedges" for cyclical symmetry. The angle of each wedge is computed as: 360.0/UCYC. Default = blank (Integer > 0 or blank)
SID	Node identifier of the second point for pattern grouping definition. (Integer or blank) If blank, the XS, YS, and ZS should not be blank.
XS, YS, ZS	Coordinates of the second point for pattern grouping definition. (Real or blank) If blank, SID should not be blank.
PATREP	Indicates if pattern repetition is defined and repetition type. (Integer) = 0: no pattern repetition = 1: pattern repetition is defined and this design variable is master = 2: pattern repetition is defined and this design variable is slave
masterID	Master /DSIZE identifier for pattern definition. (Integer > 0) This field is required only for PATREP =2.
SX, SY, SZ	Scale factors for pattern repetition in the X, Y, and Z directions, respectively. Default = 1.0 (Real > 0.0)
ptrepCID	Skew identifier used as the pattern repetition coordinate system. Default = 0 (Integer > 0)
CAID	Node identifier of an anchor point for the definition of a pattern repetition coordinate system. (Integer > 0 or blank) If blank, the XCA, YCA, and ZCA fields should not be blank.
XCA, YCA, ZCA	Coordinates of an anchor point for the definition of a pattern repetition coordinate system. (Real or blank) If blank, CAID should not be blank.
CFID	Node identifier of the first point for the definition of a pattern repetition coordinate system. (Integer > 0 or blank) If blank, the XCF, YCF, and ZCF fields should not be blank.
XCF, YCF, ZCF	Coordinates of the first point for the definition of a pattern repetition coordinate system. (Real or blank) If blank, CFID should not be blank.
CSID	Node identifier of a second point for the definition of a pattern repetition coordinate system. (Integer > 0 or blank) If blank, the XCS, YCS, and ZCS fields should not be blank.
XCS, YCS, ZCS	Coordinates of a second point for the definition of a pattern repetition coordinate system. (Real or blank) If blank, CSID should not be blank.
CTID	Node identifier of a third point for the definition of a pattern repetition coordinate system. (Integer > 0 or blank) If blank, the XCT, YCT, and ZCT fields should not be blank.
XCT, YCT, ZCT	Coordinates of a third point for the definition of a pattern repetition coordinate system. (Real or blank) If blank, CTID should not be blank.
NGROUP	Number of element groups used in zone based free-sizing optimization. Default = 0 (Integer > 0)
ETYPi	Type of followed element group. (Integer > 0), i=1, …, NGROUP = 201: /GRSHEL = 202: /GRSH3N
EGRPi	Element group numbers used in zone based free-sizing optimization. (Integer > 0), i=1, …,NGROUP
COMP	Composite manufacturing constraints applied are indicated. Information about manufacturing constraints is to follow. The value of COMP is equal to the total number of composite manufacturing definitions that follow.
CTYP	Composite manufacturing type definition flag. (Integer) = 1: laminate thickness constraints are applied. Multiple laminate thickness constraints are allowed. = 2: ply thickness constraints are applied. Multiple ply thickness constraints are allowed. = 3: ply thickness percentage constraints are applied. Multiple ply thickness percentage constraints are allowed. = 4: manufacturable ply thickness constraints are applied. Multiple manufacturable ply thickness constraints are allowed. = 5: a balance constraint is applied. Multiple balance constraints are allowed. = 6: a constant thickness constraint is applied. Multiple constant thickness constraints are allowed. = 7: ply drop-off constraints are applied. Multiple ply drop-off constraints are allowed.
LTMIN	Minimum laminate thickness for the laminate thickness constraint (CTYP = 1). (Real or blank)
LTMAX	Maximum laminate thickness for the laminate thickness constraint (CTYP = 1). (Real or blank)
GRSH3N	3-node shell group identifier (Integer > 0)
GRSH4N	4-node shell group identifier (Integer > 0)
LTEXC	Indicates that certain plies are excluded from the laminate thickness constraint (CTYP = 1). Support options are: (Integer) = 0: Plies are not excluded. = 1: The core is excluded (default). = 2: Plies defined in the constant thickness constraint (CTYP = 6) are excluded. = 3: 1 and 2 are considered.
PTANGLE	Ply orientation in degrees to which the ply thickness constraint (CTYP = 2) is applied. (Real)
PTMIN	Minimum thickness for the ply thickness constraint (CTYP = 2). (Real or blank)
PTMAX	Maximum thickness for the ply thickness constraint (CTYP = 2). (Real or blank)
PTEXC	Indicates that certain plies are excluded from the ply thickness constraint (CTYP = 2). Supported options are: (Integer) = 0: Plies are not excluded. = 1: The core is excluded (default). = 2: Plies defined in the constant thickness constraint (CTYP = 6) are excluded. = 3: 1 and 2 are considered.
PPANGLE	Ply orientation in degrees to which the ply thickness percentage constraint is applied (CTYP = 3). (Real)
PPMIN	Minimum percentage thickness for the ply thickness percentage constraint (CTYP = 3). (Real or blank)
PPMAX	Maximum percentage thickness for the ply thickness percentage constraint (CTYP = 3). (Real or blank)
PPEXC	Indicates that certain plies are excluded from the ply thickness percentage constraint (CTYP = 3). Supported options are: (Integer) = 0: Plies are not excluded. = 1: The core is excluded (default). = 2: Plies defined in the constant thickness constraint (CTYP = 6) are excluded. = 3: 1 and 2 are considered
PMANGLE	Ply orientation in degrees to which the manufacturable ply thickness constraint is applied (CTYP = 4). (Real)
PMMAN	Manufacturable ply thickness. Default = blank (Real > 0.0)
PMEXC	Indicates that certain plies are excluded from the manufacturable ply thickness constraint (CTYP = 4). Supported options are: (Integer) = 0: Plies are not excluded. = 1: The core is excluded (default). = 2: Plies defined in the constant thickness constraint (CTYP = 6) are excluded. = 3: 1 and 2 are considered.
BANGLE1	First ply orientation in degrees to which the balance constraint is applied (CTYP = 5). (Real)
BANGLE2	Second ply orientation in degrees to which the balance constraint is applied (CTYP = 5). (Real)
CANGLE	Ply orientation in degrees to which the constant thickness constraint is applied (CTYP = 6). (Real)
CTHICK	Constant ply thickness for the constant thickness constraint (CTYP = 6). (Real)
PDANGLE	Ply orientation in degrees to which the ply drop-off constraint is applied (CTYP = 7). (Real)
PDTYP	Drop-off constraint type: (Integer) = 0: PLYSLP (default) = 1: PLYDRP = 2: TOTSLP = 3: TOTDRP (Comment 2)
PDMAX	Maximum allowed drop-off for the ply drop-off constraint (CTYP = 7). (Real)
PDEXC	Indicates that certain plies are excluded from the ply drop-off constraint (CTYP = 7). Supported options are: (Integer) = 0: Plies are not excluded. = 1: The core is excluded (default). = 2: Plies defined in the constant thickness constraint (CTYP = 6) are excluded. = 3: 1 and 2 are considered.

# Free size parameters

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/DSIZE/3000

freeSizeOpti

### COPM=6: 6 composite manufacturing constraints are applied

### CTYP=3: Ply thickness percentage constraints are applied

### CTYP=4: Manufacturable ply thickness constraints are applied.

### CTYP=5: A balance constraint is applied.

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

# grpartID THICK STRESS MEMBSIZ PATRN PATREP NGROUP COMP

10001 0 0 0 0 0 0 6

# CTYP=3 PPANGLE PPMIN PPMAX GRSH3N GRSH4N PPEXC

3 0. 0. 0.8

# CTYP=4 PMANGLE PMMAN GRSH3N GRSH4N PMEXC

4 0. 0.1

# CTYP=4 PMANGLE PMMAN GRSH3N GRSH4N PMEXC

4 45.0 0.1

# CTYP=4 PMANGLE PMMAN GRSH3N GRSH4N PMEXC

4 -45.0 0.1

# CTYP=4 PMANGLE PMMAN GRSH3N GRSH4N PMEXC

4 90. 0.1

# CTYP=5 BANGLE1 BANGLE2

5 45.0 -45.0

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

1.	This entry is represented as an optimization objective in HyperMesh and HyperCrash.

2.	The options for selecting the type of drop-off constraints for PDTYP are defined for a set of plies, as shown below:

The options for PDTYP are:

•

PLYSLP

•

PLYDRP

•

TOTSLP

•

TOTDRP

dcomp_stacked_plies

Assuming that the plies are stacked as shown above, the following definition is:

dcomp_plyslp

dcomp_plydrp

dcomp_totslp

dcomp_totdrp