RBE1

Bulk Data Entry

RBE1 – Rigid Body Element, Form 1

Description

Defines a rigid body connected to an arbitrary number of grid points.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RBE1	EID	GN1	CN1	GN2	CN2	GN3	CN3
		GN4	CN4	GN5	CN5	GN6	CN6
	"UM"	GM1	CM1	GM2	CM2	GM3	CM3
		GM4	CM4	GM5	CM5	etc.

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RBE1	14	100	123456
	UM	101	123	102	123

Field	Contents
EID	Unique element identification number. Must be unique. No default (Integer)
GNi	Grid points at which independent degrees-of-freedom for the element are assigned. No default (Integer or <PartName.number>) See comment 6.
CNi	Independent degrees-of-freedom in the global coordinate system for the rigid element at grid point(s) GNi.
UM	Indicates the start of the dependent degrees-of-freedom.
GMi	Grid points at which dependent degrees-of-freedom for the element are assigned. No default (Integer or <PartName.number>) See comment 6.
CMi	Dependent degrees-of-freedom in the global coordinate system for the rigid elements at grid point(s) GMi. No default (Integers 1 through 6 with no embedded blanks)

Comments

1.	The total number of components in CN1 to CN6 must equal six; furthermore, they must jointly be capable of representing and general rigid body motion of the element. The first continuation entry is not required if there are fewer than four GN points.

2.	The degree-of-freedom declared dependent on this entry may not be:

•	Included in a single point constraint (SPC or SPC1)

•	Declared a dependent degree-of-freedom on any other RBAR, RBE1, RBE2, RBE3, or RROD entry

•	Declared a dependent degree-of-freedom on an MPC set referenced by a subcase

3.	A degree-of-freedom cannot be both independent and dependent for the same element. However, both independent and dependent components can exist at the same grid point.

4.	Rigid elements, unlike MPCs, may not be selected for use in individual subcases; they apply to all subcases.

5.	Rigid elements are ignored in heat transfer analysis.

Supported local entries in specific parts can be referenced by the use of “fully qualified references” on RBE1 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.