| Re: Different ways to model tractive effort [message #2534 is a reply to message #2158] |
Mon, 14 September 2020 09:13  |
Joerg von Lingen
Messages: 148
Registered: May 2011
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Senior Member |
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Dear all,
it has been implemented for railML2.5 and described in wiki http://wiki2.railml.org/wiki/RS:segmentTable_tractiveEffort
--
Regards,
Jörg von Lingen - Rollingstock Coordinator
Thomas Nygreen wrote on 05.03.2019 14:20:
> Dear all,
>
> The current railML2 valueTable could support any of the
> segmented functions listed by Laura and Jörg, if we for
> each row apply the formula
> F = Sum ( y_z * v^z ) for all z
> where each value for z is given by columnHeader@zValue.
>
> If no column header is found and only one column is given,
> we would assume z = 0, meaning that F = y. This allows
> programs to keep listing the tractive effort for small speed
> steps.
>
> This approach would support any polynomial function, such as
> constant (only z=0), linear (0 and 1), quadratic (0, 1, 2)
> and cubic (0, 1, 2, 3), the simple hyperbolic (-1, 0) and
> quadratic hyperbolic (-2) listed by Laura and Jörg, and
> other simple rational functions where there is no shift of
> the x variable.
>
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