The Cartesian coordinate system can be used in 3 or more dimensions.
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Yes! By expanding the system to 3D!
Cartesian coordinates ( Rectangular) x,y,z From starting point (datum, usually 0,0,0) , locate point using x and y (2D) and x,y and z (3D) dimensions Example: Location : 20,65,100 From start point : 20 right and horizontal (x), turn left 90 degrees go 65 (y) Turn normal and up from 2D plane go 100.
AutoCAD uses the Cartesian coordinate system as a basis to layout its vectors. Each coordinate is the distance of a point on the x-, y-, or z-axis from the origin.In 2D settings, it uses the (x , y) format.In 3D settings, it uses the (x, y, z) format.For example, you do the LINE command and place it at (0, 0), that coordinate will be the start of the line segment. The next point clicked, for example (2, 3) is going to be the end of that line segment.If you use the "@" notation when placing vectors, you have a distance compared to what the previous point was instead of compared to the origin.For example, if you added another line segment onto the previous line that went from (0, 0) to (2, 3), you might want the line to go 1 unit up and 1 unit right compared to the previous endpoint (2, 3). If this is so, you can do "@1, 1" to make the line segment go 1 up and 1 right from the previous point.
All points with a 0 for the x coordinate is the y axis.
model the component if you are using beam element no problem to apply the torsional BC. if your using a solid 3D element, you dont have a DOF as Rotation (Rx,Ry, Rz). therefore once you meshed, change the co-ordinate system to Global Cartesian to Global Cylindrical. apply the force by picking the nodes of the the component.