| Applies To | |
| Product(s): | AutoPIPE Nozzle |
| Version(s): | V8i |
| Environment: | N/A |
| Area: | Report |
| Original Author: | Bentley Technical Support Group |
| Date Logged & Current Version | Aug. 2016 08.11.08.26 |
Problem:
Local Axis system load values do not appear to match WRC Axis system values in AutoPIPE nozzle output report?
Solution:
AutoPIPE Nozzle output reported values are correct.
Note the images that show the axis directions, confirm axis directions to be:
Thus:
Note that the forces are straight forward but the Moments are a little more involved to understand. Let us look at the following example of the X-axis moment.
Example #1: X-Axis moment
See WRC107 Axis vs Global axis
a. Look at the Global X-Axis = -X point vertical Up
b. using right hand rule, and looking at the axis from the arrow end, understand that the moment is rotating in a CCW (Counter Clock Wise direction) about the -X axis.
c. Per WRC 107 axis, flip your right hand in the direction of the +Radial, P direction, Vertically down, while still looking at the moment direction from the same point of view as above, tail end, now the moment direction about the X axis direction are CW (clockwise)
Therefore the Radial,P moments are -(global Axis).
OR, Global MX moments (+5005) = -ve WRC107 Radial, P = - (+5005) = -5005.
Example #2: Y-Axis moment
Using the same image above
a. Look at the Global Y-Axis = -Y point towards the nozzle.
b. In order to match the moment and pointing in the +Y axis direction must use Left hand rule
c. Again, looking at the axis from the +Y axis end point arrow end, understand that the moment is rotating in a CW (Clockwise direction) about the +Y axis.
c. Per WRC 107 axis, flip your left hand in the +VC axis direction, towards the nozzle, while still looking at the moment direction from the same point of view as above, tail end, now the moment direction about the Y axis direction are CCW (Counter Clockwise)
Therefore the VC moments are -(global Axis).
OR, Global MY moments (+4913) = -ve WRC107 VC = - (+4913) = -4913.
Example #3: X-Axis moment
Using the same image above
a. Look at the Global Z-Axis = +Z shell axis pointing away from the nozzle.
b. In order to match the moment and pointing in the +Z axis direction must use Right hand rule
c. Again, looking at the axis from the +Z axis arrow end, understand that the moment is rotating in a CCW (Counter Clockwise direction) about the +Z axis.
c. Per WRC 107 axis, flip your left hand in the +VL axis direction, towards the nozzle, while still looking at the moment direction from the same point of view as above, tail end, now the moment direction about the Z axis are CW (Clockwise)
Therefore the VC moments are -(global Axis).
OR, Global MZ moments -() = -ve WRC107 VC = - (+4913) = -4913.
Confirmation that AutoPIPE Nozzle's output reported values in sections 4 and 5 are correctly displayed.
See Also
Results Output in AutoPIPE Nozzle