D-line Calculation Options dialog
This dialog box is accessed from the D-Line System dialog box. It allows you to change the type of analysis and other parameters related to the deflection calculation.
Type of Analysis (group of four radio buttons)
The main calculation options are shown in the Type of Analysis group. Depending on your choices, you will be required to enter additional parameters below:
Enter the required Clearance in project units.
Enter the payload required in Load.
Enter the Load, and % Deflection (equivalent mid span).
Enter the % Deflection (equivalent mid span).
Haulback Tension Fixed
Enter the Haulback Tension.
Clamped Carriage
The carriage is now clamped to the skyline and the haulback is assumed slack. For a Slack Pulling carriage the mainline tension is set to the load.
NOTE: changing the units for load will also change the units on the payload output display. Similarly changing the units for haulback tension will change the tension display.
Calculation Points
The cable mechanics calculations are performed at discrete sample points along the profile. You can control the spacing and number of calculation points using the Calculation Points group.
Ground Break Points (check box)
Select this to get a calculation at each break in the ground (survey hubs if the topography was surveyed).
If your profile is draped over LiDAR data, then you should clear this check box to avoid too many samples (there is a maximum of 50).
Equal Intervals (check box)
Select this to divide the calculation range into equally spaced calculation points; the spacing is determined by the # slices (number of intervals) parameter.
Note that an odd number of slices will put calculation points on the extremes of the calculation range (Stn From and To ). An even number of slices will start and finish half an interval from the ends.
Station From/To
Modify the Stn From and To to exclude unlogged regions at either end. By default Cable Analysis calculates from just after head spar to just before the tail.
