沿线生成节点

wrj001

Defining a straight line between the two end nodes
To define a straight line between the two end nodes, specify the number of the first end node, ; the number of the last end node, ; and the increment in node numbers between each node along the line, i. Therefore, i must be an integer such that  is a whole number (not a fraction). The default is .

Input File Usage:                  
*NGEN

For example, in the following input node number 1 with coordinates (0., 0., 0.) and node number 6 with coordinates (10., 0., 0.) are defined and nodes 2, 3, 4, and 5 with coordinates (2., 0., 0.), (4., 0., 0.), (6., 0., 0.), and (8., 0., 0.), respectively, are generated automatically:
*NODE
1, 0., 0., 0.
6, 10., 0., 0.
*NGEN
1, 6, 1

Defining a circular arc between the two end nodes
To define a circular arc between the two end nodes, specify the number of the first end node, ; the number of the last end node, ; and the increment in node numbers between each node along the arc, i. Therefore, i must be an integer such that  is a whole number (not a fraction). The default is .

In addition, you must specify the coordinates of one extra point, the center of the circle, either by giving the node number of a node that has already been defined or by giving the nodal coordinates directly. If both are supplied, the node number will take precedence over the coordinates.

If the coordinates are defined directly, they can be specified in a local coordinate system as described later.

The coordinates of the end nodes will be adjusted radially if the circle cannot be passed through both points. An arc of a circle of 180� through 360� will require more extensive definition. For this case you must define the plane of the circular disc by giving the normal to the disc; the nodes will then be numbered according to the right-hand rule about this normal.

Input File Usage:                  
*NGEN, LINE=C

Defining a parabola between the two end nodes
To define a parabola between the two end nodes, specify the number of the first end node, ; the number of the last end node, ; and the increment in node numbers between each node along the parabola, i. Therefore, i must be an integer such that  is a whole number (not a fraction). The default is .

In addition, you must specify the coordinates of one extra point, the midpoint on the arc between the two end points, either by giving the node number of a node that has already been defined or by giving the nodal coordinates directly. If both are supplied, the node number will take precedence over the coordinates.

If the coordinates are defined directly, they can be specified in a local coordinate system as described later.

Input File Usage:                  
*NGEN, LINE=P