This function is used to create a local
coordinate system.
eta/DYNAFORM
refers to the local coordinate system to translate, rotate, mirror, copy, and
generate points, lines, or nodes. When the function is selected, the user needs
to generate a local system designated as the UVW coordinate frame using the LCS
dialog box as illustrated in Figure 14.17.2.
The user can create a new LCS or select a coordinate system as the
current LCS by selecting Global, Current LCS, Last Defined LCS, or View
Direction.
Figure 14.17.2 LCS dialog box
DEFINED BY 3 LOCATIONS
This function enables user to define a local
coordinate system by specifying three nodes/points.
Near Node: Define LCS by selecting three nodes. The first selected node is defined
as the origin of the LCS. The coordinate value of the defined origin in Global
system is also shown. The user can manually edit the coordinate.
Near Point: Define LCS by selecting three geometry points. The first selected point
is defined as the origin of the LCS.
Reject Last Node/Point: Reject last selected
node/point.
Note: If the user defines a LCS through the Defined
by 3 locations option, at least one node/point needs to be defined.
If one node/point is defined, the defined node/point sets the origin of the
LCS. The local U, V, W-Axis are parallel to the global X-, Y-, Z-Axis,
respectively.
If two nodes/points are defined, the first selected node/point sets the origin
of the LCS. The local W-Axis is the vector orientation from the first
node/point to the second node/point.
If three nodes/points area defined, the first selected node/point sets the
origin of the LCS. The local U-Axis is the vector orientation from the first
node/point to the second node/point. The selected three nodes/points determines
the local UV-Plane. The local W-Axis is orthogonal with the UV-Plane.
THROUGH U,
V, W
This function enables user to define a local coordinate system by specifying the local U-, V- and W-Axis.
U-Axis: This function allows the user to
define local U-Axis direction. After clicking this button, the Define Direction
dialog box is displayed. The user may select any of the LCS in the list.
V-Axis: This function allows the user to
define local V-Axis direction. After clicking this button, the Define Direction
dialog box. The operation is the same as in U-Axis.
W-Axis: This function allows user to
define local W-Axis direction. After clicking this button, the Define Direction
dialog box is displayed. The operation is the same as in U- and V-Axes.
Note: The user may define U-Axis and V-Axis to define LCS. W direction
is calculated according to the right hand rule.
W=U×V
The V-Axis is adjusted again from the W- and U-Axis according to the right hand rule.
V=W×U
The user may only define W-Axis
direction to define the LCS. The U, V direction is defined automatically. This
option is useful when the local U and V direction are not important.
GLOBAL
Create a local coordinate system using the global coordinate system and set the new created LCS as the current LCS.
CURRENT LCS
Create a local coordinate system using the current LCS.
LAST DEFINED LCS
Create a local coordinate system using the last defined coordinate system and set the new created LCS as the current LCS.
VIEW DIRECTION
Define the view directions as the W-Axis of the current LCS. The user can select or define a point as the origin, or the origin of the global coordinate system can be the origin of the current LCS.
The Defined by 3 locations option enables the user to create a local coordinate system based on the selection of three reference points/nodes.