# Axis System Type

This task shows you how to select a:

The list of the available axis system types depends on the functionality.

Axis systems are used in the definition of loads, restraints, connection properties (for example: force, advanced restraint, stiffness). The components of this force, advanced restraint or stiffness will be interpreted as relative to the specified coordinate system.

Left-handed axis systems are not supported.

## Global Axis System

 The Display locally check box is not always available. To know more, refer to the description of this option.

If you select the Global axis system, the components will be interpreted as relative to the fixed global rectangular coordinate system.

## Implicit Axis System

 The Display locally check box is not always available. To know more, refer to the description of this option.

If you select the Implicit Axis system, the components will be interpreted as relative to a local coordinate system computed on the selected support.

## User-defined Axis System

 The Display locally check box is not always available. To know more, refer to the description of this option.
• Current axis: lets you select the axis system you choose as reference axis system.
This axis must be created in the Part document.
• Local orientation: lets you choose between three local coordinate systems (Cartesian, Cylindrical, Spherical) in which the components are interpreted as relative.
• Cartesian:  Axis is built locally at any point P of the support as shown below:
• Cylindrical:  Axis is built locally at any point P of the support as shown below: Uz is collinear to z, where z represents the revolution axis of a cylinder. Ur and UΘ are respectively the radial and tangential components in the plane which is perpendicular to the z axis.
• Spherical:  Axis is built locally at any point P of the support as shown below: The origin of the local axis system is at the node of interest (P). So for each node of the support, a local axis is built. Ur, UΘ and UΦ are respectively the radial, circumferential and meridionial components.

## Display Locally

This option lets you display the selected axis system locally on the geometry.

 The Display locally check box is not always available. It depends on the selected support, the Display locally check box is available for geometrical supports and virtual parts. For example: This option is not available in the case of a connection property. This option is available in the case of a surface force. In the following example, the Implicit axis system Type and the Display locally check box have been selected: