CORD4R

Bulk Data Entry Defines a rectangular coordinate system using three grid points specified with respect to the basic coordinate system.

The coordinates of the three non-collinear grid points are used to uniquely define the coordinate system. The first point is the origin, the second lies on the X-axis, and the third lies in the X-Y plane.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CORD4R CID   A1 A2 A3 B B B  
  C C C            

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CORD4R 3   -2.9 1.0 0.0 3.6 0.0 1.0  
  5.2 1.0 -2.9            

Definitions

Field Contents SI Unit Example
CID Unique coordinate system identification.
Integer
Specifies an identification number for this coordinate system.
<String>
Specifies a user-defined string label for this coordinate system. 7

(Integer > 0 or <String>)

  
A1, A2, A3, B, B, B, C, C, C Coordinates of three points in the basic coordinate system.

(Real)

  


Figure 1. CORD4R Definition

Comments

  1. Coordinate system identification numbers on all CORD1R, CORD1C, CORD1S, CORD2R, CORD2C, CORD2S, CORD3R, and CORD4R entries must all be unique.
  2. A duplicate identification number is allowed if the CID and GID are identical and the coordinates are within the value set by PARAM,DUPTOL.
  3. The three points (A1, A2, A3), (B, B, B), (C, C, C) must be unique and non-collinear. Non-collinearity is checked by the geometry processor.
  4. The location of a grid point (P) in this rectangular coordinate system is given by (X, Y, and Z). See Figure 1.
  5. The displacement coordinate directions at P are (Ux, Uy, and Uz). See Figure 1.
  6. A maximum of two coordinate systems may be defined on a single entry.
  7. String based labels allow for easier visual identification of coordinate systems, including when being referenced by other cards. Currently, coordinate systems with string IDs can be referenced only by JOINTG elements. For more details, refer to String Label Based Input File in the Bulk Data Input File.
  8. This card is represented as a system in HyperMesh.