-
-
Notifications
You must be signed in to change notification settings - Fork 36
/
Copy pathORIENTATION.html
6 lines (5 loc) · 3.2 KB
/
ORIENTATION.html
1
2
3
4
5
6
<html><head><link rel="stylesheet" type="text/css" href="style.css"/></head><body> <H2> <BR> *ORIENTATION </H2> <P> Keyword type: model definition <P> This option may be used to specify a local axis system X'-Y'-Z' to be used for defining material properties. For now, rectangular and cylindrical systems can be defined, triggered by the parameter SYSTEM=RECTANGULAR (default) and SYSTEM=CYLINDRICAL. <P> A rectangular system is defined by specifying a point a on the local X' axis and a point b belonging to the X'-Y' plane but not on the X' axis. A right hand system is assumed (Figure 158). <P> <DIV ALIGN="CENTER"> <TABLE> <CAPTION ALIGN="BOTTOM"><STRONG>Figure 158:</STRONG> Definition of a rectangular coordinate system</CAPTION> <TR><TD><IMG WIDTH="453" HEIGHT="351" BORDER="0" SRC="img2481.png" ALT="\begin{figure}\epsfig{file=Rect.eps,width=10cm}\end{figure}"></TD></TR> </TABLE> </DIV> <P> When using a cylindrical system two points a and b on the axis must be given. The X' axis is in radial direction, the Z' axis in axial direction from point a to point b, and Y' is in tangential direction such that X'-Y'-Z' is a right hand system (Figure 159). <P> <DIV ALIGN="CENTER"> <TABLE> <CAPTION ALIGN="BOTTOM"><STRONG>Figure 159:</STRONG> Definition of a cylindrical coordinate system</CAPTION> <TR><TD><IMG WIDTH="453" HEIGHT="319" BORDER="0" SRC="img2482.png" ALT="\begin{figure}\epsfig{file=Cyl.eps,width=10cm}\end{figure}"></TD></TR> </TABLE> </DIV> <P> Instead of listing the coordinates of points a and b explicitly on the line underneath *ORIENTATION, the user can specify a distribution defined by a *DISTRIBUTION card. <P> The parameter NAME, specifying a name for the orientation so that it can be used in an element property definition (e.g. *SOLID SECTION) is required (maximum 80 characters). <P> Notice that a shell ALWAYS induces a local element coordinate system, independent of whether an *ORIENTATION applies or not. For details the user is referred to Section 6.2.14. <P> For rectangular systems an additional rotation about one of the local axes can be specified on the second line underneath the *ORIENTATION card. <P><P> <BR> <P> First line: <UL> <LI>*ORIENTATION </LI> <LI>Enter the required parameter NAME, and the optional parameter SYSTEM if needed. </LI> </UL> Second line (explicit definition of a and b): <UL> <LI>X-coordinate of point a. </LI> <LI>Y-coordinate of point a. </LI> <LI>Z-coordinate of point a. </LI> <LI>X-coordinate of point b. </LI> <LI>Y-coordinate of point b. </LI> <LI>Z-coordinate of point b. </LI> </UL> Second line (use of a distribution): <UL> <LI>name of the distribution. </LI> </UL> Third line (optional for local rectangular systems) <UL> <LI>local axis about which an additional rotation is to be performed (1=local x-axis, 2=local y-axis, 3=local z-axis). </LI> <LI>angle of rotation in degrees. </LI> </UL> <P> <PRE>
Example:
*ORIENTATION,NAME=OR1,SYSTEM=CYLINDRICAL
0.,0.,0.,1.,0.,0.
</PRE> <P> defines a cylindrical coordinate system with name OR1 and axis through the points (0.,0.,0.) and (1.,0.,0.). Thus, the x-axis in the global coordinate system is the axial direction in the cylindrical system. <P> <P><P> <BR> Example files: beampo2,beampo6. <P> </body></html>