Jonathan Schneider's Activities

Cant: Manual Input

Jonathan Schneider — Tue, 24 Oct 2023 16:07:29 GMT

ORD seems very insistent on "helping me" with my cant calculations.

It inputs its own values automatically when creating cant for the alignment. I then edit them (rather painfully in the current editor which loses my row every time I enter a value).

Then every time I change ANYTHING on the alignment, be it a curve five miles away, or the feature definition, or a station equation, it overrides all my inputted values and puts them back to what it thinks they should be.

So I turn of the "rules" in the editor. At least I can now make the most basic of changes to the alignment without it defaulting back to its values. but I am punished for this: Since it now unruled, it won't even move the cant points to match the revised alignment so I end up remaking the cant file.

AND I discovered today that when I EXPORT / IMPORT the alignment to another file via xml, the cant comes through . . . once again with its own, incorrect computed values.

Question 1: Am I missing something? Is there any way to get the cant to "stay" on my engineered value when exporting?

Question 2: Is my experience that different than the rest of the track engineering world? Applied cant is a case-by-case value. It depends on speed and geometry, yes . . . but also available clearance and how much deficiency one is willing to live with. It is not always something that a computation can decide.

Is Bentley looking into a more realistic way to set cant based on real life conditions?

2022 Release One: Profile Annotation with Chord Definition

Jonathan Schneider — Tue, 29 Nov 2022 20:40:42 GMT

Not sure the below image will be readable, but the issue is simple (solution may not be).

Plan (horizontal) is annotated using chord definition of stationing. It seems right.

Profile still seems to "want to" annotate using arc method stationing. The two tracking boxes that pop up when using tracking (aka civil analysis) show different results. The one on the right (blue text on white background) shows arc method stationing when there are no equations in the alignment. When equations are added, I honestly don't know what it's showing. The box on the left appears to show the CORRECT station and coordinates (verified via plan view).

More important, both the annotation AND output files seem to be following whatever's in the "bad box" on the right. In other words, the station in plan view is different than the station in profile view.

BTW: We're still looking at it, but it appears even the "legacy" software (Inroads/BRT) may have also done this. There wasn't really a convenient way of checking it in the past with simultaneous tracking.

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Tue, 29 Nov 2022 00:39:28 GMT

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