PRBODY

Bulk Data Entry Defines a rigid body out of a list of finite element properties, elements and grid points.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PRBODY BID BODY_NAME
TYPE1 ID1 ID2 ID3 ID4 ID5 ID6 ID7
ID8 etc
TYPE2 ID1 ID2 etc
TYPE# etc
etc
MASS M
INERTIA IXX IYY IZZ IXY IXZ IYZ CID
COG X,G Y Z

Example 1

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PRBODY 3 ARM1
PSHELL 23 21
PBEAM 9 59 48
CONM2 2345
GRID 400 401 402

Example 2

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PRBODY 4 LEVER
PBAR 10 11 13 15 22 99 88
44
MASS 100.0
INERTIA 120.0 130.0 123.0 0.0 0.0 0.0
COG 29

Definitions

Field Contents SI Unit Example
BID Unique body identification number.

No default (Integer > 0)
BODY_NAME Unique body name. This body name for this PRBODY.

Default = OUTFILE_body_<BID> (Character string)
TYPE# Flag indicating that the following list of IDs refer to entities of this type. All property definitions; CELAS2, CONM2, PLOTEL, RBE2, RBE3, RBAR, RROD, and GRID are valid types for this field.

No default (PBAR, PBARL, PBEAM, PBEAML, PBUSH, PCOMP, PCOMPP, PCOMPG, PDAMP, PELAS, PGAP, PROD, PSHEAR, PSHELL, PSOLID, PVISC, PWELD, CELAS2, CONM2, PLOTEL, RBE2, RBE3, RBAR, RROD, or GRID)
ID# Identification numbers of entities of the preceding TYPE flag.

No default (Integer > 0)
MASS Flag to overwrite the finite element mass of the body. Indicates that a mass value is to follow.
M Mass. Must be positive non-zero values.

(Real > 0.0)
INERTIA Flag to overwrite the finite element inertia of the body. Indicates that the inertia properties are to follow.
IXX, IYY, IZZ, IXY, IXZ, IYZ Moments of inertia.

(For IXX, IYY, IZZ Real > 0.0)

(For IXY, IXZ, IYZ Real)
CID Coordinate system identification number to define the orientation of the inertia tensor.

A CID of zero or blank references the basic coordinate system.

(Integer ≥ 0 or blank)
COG Flag to overwrite the finite element center of gravity of the body. Indicates that the center of gravity is to follow.
X, Y, Z Location of the center of gravity.

(Real)
G Grid point identification number to optionally supply X, Y, and Z.

(Integer > 0)

Comments

  1. Any number of property definitions; CELAS2, CONM2, PLOTEL, RBAR, RBE2, RBE3 or RROD elements or grid points can be given.
  2. At least one property definition, element, or grid point must be given.
  3. A property definition; CELAS2, CONM2, PLOTEL, RBE2, RBE3, RBAR or RROD element or grid point can only belong to one rigid or flexible body.
  4. All property definitions, elements and grid points defined on a PRBODY Bulk Data Entry form one rigid body. The mass and inertia properties are defined by the finite element and mass properties unless they are overwritten by the mass and inertia properties given on the continuation lines.
  5. The mass, inertia and center of gravity input is optional, if element/property information is provided in the PRBODY definition.
  6. If one of MASS, INERTIA or COG continuations is provided, all three continuations must be provided.
  7. If just the principal inertia is specified, IXX, IYY, and IZZ must be positive non-zero values and they must satisfy the condition: the sum of two inertia values must be greater than the third (IXX + IYY > IZZ, IYY+IZZ > IXX, IZZ+IXX > IYY).
  8. This card is represented as a group in HyperMesh.