SPCD

Bulk Data Entry

SPCD – Enforced Motion Value

Description

Defines an enforced displacement value for static analysis, an enforced displacement, velocity or acceleration for dynamic analysis and a thermal boundary condition for heat transfer (or transient heat transfer) analysis. It can also be used to define the EXCITEID field (Amplitude “A”) of dynamic loads in RLOAD1, RLOAD2, TLOAD1 and TLOAD2 bulk data entries.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
SPCD	SID	G	C	D	G	C	D

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
SPCD	100	32	436	-2.6	5	1	+2.9

Field	Contents
SID	A static load set identification number. (Integer > 0)
G	Grid or scalar point identification number. (Integer > 0 or <PartName.number>) See comment 8.
C	Component numbers in the global coordinate system. (6 > Integer > 0; up to six unique such digits may be placed in the field with no embedded blanks)
D	(Real)	Value of enforced motion for all grids and components designated by G and C.
	(F)	This option is used in conjunction with the CNTNLSUB entry to retain the deformed boundary resulting from a preceding nonlinear subcase. See comment 5 on the CNTNLSUB entry.

Comments

1.	The degree-of-freedom (G and C) referenced on this entry must also be referenced on an SPC or SPC1 bulk data entry and selected by the SPC subcase information command in the same subcase.

2.	For use in linear static and linear steady state heat transfer analyses, the load set identification number must be selected by the LOAD subcase information command.

3.	For use in dynamic analysis, the load set identification number must be referenced by the EXCITEID field of an RLOAD1, RLOAD2, TLOAD1, or TLOAD2 bulk data entry that has enforced motion specified in its TYPE field.

4.	The bulk data LOAD combination entry cannot combine an SPCD load.

This method of applying enforced displacements in static analysis is equivalent to that of using an SPC entry. For static and dynamic analyses, when the SPSYNTAX setting on the SYSSETTING I/O option is set to CHECK (default) or STRICT, it is required for grid/component pairs (G#/C#) that the component be 0 or blank when the grid reference is a scalar point (SPOINT), and that the component be > 1 when the grid reference is a structural grid point (GRID). When SPSYNTAX is set to MIXED, it is allowed for grid/component pairs (G#/C#) that the grid reference be either a scalar point (SPOINT) or a structural grid point (GRID) when the component is 0, 1 or blank; interpreting all of these as 0 for scalar points and as 1 for structural grids. When the component is greater than 1, the grid reference must always be a structural grid (GRID).

6.	The SPCD units for rotational degrees-of-freedom is radians.

7.	For use in transient heat transfer analysis, the load set identification number must be referenced by the EXCITEID field of a TLOAD1 or TLOAD2 bulk data entry that has enforced temperature specified in its TYPE field (TYPE = 1).

Supported local entries in specific parts can be referenced by the use of “fully qualified references” on SPCD entries in the model. A fully qualified reference (“PartName.number”) is similar to the format of a numeric reference. “PartName” is the name of the part that contains the referenced local entry (part names are defined on the BEGIN Bulk Data entry in the model). “number” is the identification number of a referenced local entry in the part “PartName”. See Parts and Instances in the User’s Guide for detailed information on the use of fully qualified references.

9.	This card is represented as a constraint load in HyperMesh.