Home » railML newsgroups » railml.rollingstock » Different ways to model tractive effort (How to enter discrete, hyperbolic or quadratic tractive effort curves?)
Re: Different ways to model tractive effort [message #2477 is a reply to message #2158] Wed, 01 July 2020 08:32 Go to previous messageGo to previous message
Joerg von Lingen is currently offline  Joerg von Lingen
Messages: 148
Registered: May 2011
Senior Member
Dear all,

I have transfered the issue into ticket #385 to be implemented in railML 2.5.

The suggestion is to add an alternative element "segmentTable" used instead of
"valueTable". Basically this table is similar build as the known valueTable with
some exceptions and a different way of interpretation.

The zValue (here "exponentValue") is of type integer and shall be taken as
exponent to the xValue (here "segmentStartValue"). The latter one marks the
start of an intervall or segment in the curve. The maximum xValue shall be
derived from the "speed" attribute of the vehicle. The yValue (here
"coefficentValue") is the value of each coefficent to be multiplied with xValue
to the power of zValue. The total of all calculated values of the line gives
real value need. Thus it follows the formula F = Sum ( y * x^z).

The sample of the original data, the schema definition and the representation in
railML are shown in the attached pictures.


Best regards,
Joerg v. Lingen - Rollingstock Coordinator

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