| Re: Modelling transition bends [message #1234 is a reply to message #1232] |
Mon, 01 December 2014 22:11   |
Christian Rahmig
Messages: 151
Registered: January 2011
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Senior Member |
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Dear everyone,
Am 01.09.2014 11:46, schrieb Christian Rahmig:
> Dear railML users,
>
> with the ticket #251 (cf. [1]) we re-opened the topic of modelling
> transition bends, which was already "discussed" here in the forum some
> years ago (cp. [2]).
>
> [...]
at the last railML.org conference in Paris on 07.10.2014, I presented a
solution for the transition curve problem, which is applicable to railML
2.2 (see [1]).
In particular, there are two possible approaches based on <radiusChange>
element (see [2]):
(1) add further description of the radiusChange using the description
attribute. Thus, the type of the curve can be described. If not empty,
possible values can be:
* UA_cubicParabola
* UA_parabola4
* UA_clothoide
* UA_WienerBogen
* UA_BlossBogen
* UA_Sinusoide
* UA_Cosinusoide
* UA_other
* UE, which marks the end of the transition curve.
(2) model the length of a transition curve between two other elements
using a new optional parameter named transitionLength:
* transitionLength = 0 is a direct connection between straight lines
and circular arcs
* transitionLength > 0 is a connection with a transition bend of a
certain length
Alternatively to (1), it could be also possible to put the name of the
transition curve element in a new optional parameter
geometryElementName, which would specify the linear track geometry
element starting at the marked point (radiusChange).
Any comments appreciated...
[1]
http://documents.railml.org/events/slides/2014-10-08_rahmig- railmltransitionbends.pdf
[2] https://trac.railml.org/ticket/251
--
Christian Rahmig
railML.infrastructure coordinator
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