CONSTRUCT COORDSYS RECTANGUL

        

This command is used to define a local rectilinear coordinate system.

FEMGEN command

CONSTRUCT COORDSYS RECTANGUL [csyst] Pnamo Pnamz Pnamx

csyst = optional name of the local coordinate system

Pnamo = origin of coordinate system

Pnamz = defines the local z-axis direction, `pnamo' to `pnamz'

Pnamx = defines the local x-axis direction, which is the vector from `pnamo' to `pnamx' projected onto the plane normal to the local z-axis.

The y-axis of the local coordinate system is automatically derived from the x- and z-axes.

Local rectilinear coordinate systems may be selected for use in the definition of point coordinates using the command CONSTRUCT COORDSYS LOCAL, or for the creation of skew boundary conditions using the command PROPERTY ATTACH

 

Figure 2.2: Definition of a rectangular coordinate system

Notes:

1.

Default names
If no name is entered a default name is created, this is CSn where n is a count of defined coordinate systems. The default name can be changed with the CONSTRUCT NAME command.

Examples:

1.

CONSTRUCT COORDSYS RECTANGUL CR1 PO1 PZ1 PX1

This creates a rectangular coordinate system called CR1 with its origin at point PO1. The z-axis is defined by PZ1 and the x-axis by PX1.

See also the following commands

'CONSTRUCT COORDSYS LOCAL'
'CONSTRUCT NAME'
'PROPERTY ATTACH'
'UTILITY TABULATE GEOMETRY CSYST'
'UTILITY DELETE GEOMETRY CSYST'

FEMVIEW command

 

CONSTRUCT COORDSYS RECTANGUL [csyst] def

This command is used to define a local rectangular system for use with RESULTS TRANSFORM LOCAL

csyst = optional name of the local coordinate system

defn = three sets of model coordinates (x, y, z) defining the local origin, local z axis and local zx plane of the system.

= or the keyword NODES with three node numbers defining the local origin, local z axis and local zx plane of the system.

Each time that a new axis system is created an axis set is drawn at the local origin to indicate the location and orientation of the coordinate system.

See also the following commands

'RESULTS TRANSFORM LOCAL'
'UTILITY TABULATE '

Examples:

1.

CONSTRUCT COORDSYS RECTANGUL 1.1 1.2 2.1 3.2 2.1 4 6.5 6.5 6.5

Creates a rectangular axis system with the origin at x=1.1, y=1.2 and z=2.1. The local z axis of the system passes through x=3.2, y=2.1 and z=4 and the local zx plane contains a point at 6.5 6.5 6.5. A name for the system will be generated automatically.

2.

CONSTRUCT COORDSYS RECTANGUL SYS1 NODES 1 10 15

Creates a cylindrical axis system called SYS1 with the origin at node 1, the local z axis defined by node 10 and the local zx plane defined by node 15.