| Re: May I use z parameter for notch as engine tractiveEffort? [message #1319 is a reply to message #1318] |
Tue, 14 October 2014 00:23  |
yutaka.manchu
Messages: 11
Registered: September 2014
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Junior Member |
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Dear Jörg,
Thank you very much to write back to me!
Best regards,
Utah (Yutaka Manchu)
Joerg von Lingen wrote:
>
> Dear Utah,
>
> your assumption is correct. The structure of ValueTable allows to define a
3D matrix of values. The effort curve is
> normally given as effort vs. speed but there might be another parameter like
notch position or line voltage etc to
> define a group of curves instead a single one.
>
> Best regards,
> J�rg von Lingen
>
> Yutaka Manchu wrote on 02.10.2014 09:40:
>> Dear All,
>>
>> Some engines have an acceleration/power control lever with several
>> notches.
>> Each notch limits the acceleration/power level of the engine.
>>
>> To express this notion, I'd like to confirm the correctness to use z
>> parameter of valueTable written in
>> " http://wiki.railml.org/index.php?title=RS:valueTable_tractiv eEffort", as
>> "'z' is the additional parameter extending the dependency to y = f(x,z)"
>> and "In case of several curves versus the x-coordinate there is the child
>> element <columnHeader>, which takes the values of the z-coordinate as
>> parameter for the array of curves.".
>>
>> According to "http://wiki.railml.org/index.php?title=RS:columnHeader", it
>> could be expressed as followings;
>>
>> <vehicle id="ve_6000-Mc1" name="6000-Mc1" length="9.0" speed="60.0"
>> bruttoWeight="3145.8" bruttoAdhesionWeight="393.2">
>> <engine>
>> <propulsion id="peMotor" powerType="electric" power="1105000"
>> rotationMassFactor="1.0" description="Motor">
>> <tractiveEffort>
>> <valueTable xValueName="Speed" xValueUnit="km/h"
>> yValueName="Tractive Effort" yValueUnit="N" zValueName="Notch"
>> zValueUnit="1">
>> <columnHeader zValue="1">
>> </columnHeader>
>> <valueLine xValue="0.0">
>> <values yValue="5950.1" />
>> </valueLine>
>> <valueLine xValue="36.5">
>> <values yValue="4200.0" />
>> </valueLine>
>> ...
>>
>> <columnHeader zValue="2">
>> </columnHeader>
>> <valueLine xValue="0.0">
>> <values yValue="10016.1" />
>> </valueLine>
>> <valueLine xValue="35.0">
>> <values yValue="8200.0" />
>> </valueLine>
>> ...
>>
>> </valueTable>
>> </tractiveEffort>
>> </propulsion>
>> </engine>
>> </vehicle>
>>
>> May I ask you if my understanding is right?
>>
>> Best regards,
>> Utah (Yutaka Manchu)
>>
>
>
>
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