| Re: speed profiles and braking percentages [message #369 is a reply to message #305] |
Sat, 22 September 2012 12:08   |
Christian Rahmig
Messages: 151
Registered: January 2011
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Senior Member |
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Hello Susanne, Dirk and anyone interested,
>>> [minimum percentage of brake power]
>>>
>>> At some railway infrastructure companies the minimum percentage of
>>> brake power can't be directly calculated by means of physics. It is
>>> somehow defined by some legal body.
>>>
>>> Therefore we would suggest an additional attribute
>>> "minimumBrakePercentage" for this value in the <speedProfile> element.
>> A more proper solution would be:
>> There is a "minimumBrakePercentage" for each section of a speed
>> profile between two places where trains can start or end
>> (i. e. between two stations).
>
> How about putting this attribute into the "speedChange"?
>
> For sure, it messes up the code. :-(
>
> But this allows for defining "sections of speed aspects" instead of
> "lots of quite equal speed profiles".
If the attribute "minimumBrakePercentage" is directly coupled with the
speed information and only used for speed profile purposes, I agree to
somehow implement it in connection with the <speedChange> element. But
if we can think of other usages of the "minimumBrakePercentage"
information, i prefer to put it in an extra element outside the
<speedProfile>.
Therefore my question to everyone: Are there any other applications for
the "minimumBrakePercentage" information, which are not connected to the
speed of the train?
>> At least, for completeness: If we add a "minimumBrakePercentage" to
>> <speedProfile> we also have to provide them with a brake type and a
>> brake switch position (rail:tAirBrakeApplicationPosition). The same
>> brake percentage can mean totally different braking power depending on
>> the brake position (G or P,...).
>
> Thanks again. That's a good point we should forseen.
At the moment, within the ongoing implementation of trac ticket [1] for
railML 2.2, we only defined the new attribute "minimumBrakePercentage"
of type "tBrakePercentage" for a <speedProfile>. Depending on the
comments on my above question, I would add the further attributes
mentioned there.
[1] https://trac.assembla.com/railML/ticket/41
Regards
--
Christian Rahmig
railML.infrastructure coordinator
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