[Csantucci]

Hi Peter,
Thanks for your help.

[engmod]

Carlo,

I have isolated a problem with the calculation of derailcoff.

The discussion can be found here:- https://www.trainsim...ge3#post2316450

This problem relates to a 5 pack container set, specifically to an empty car not being an end car.

Log file for reference.

Do you have knowledge of the coder of the derailcoff?

Attached File(s)

•  OpenRailsLog.txt (12.59K)
  Number of downloads: 2
•  Clipboard_12-11-2024_01.jpg (831.55K)
  Number of downloads: 9

[Csantucci]

I haven't written such code. I had now a look on this.
DerailmentCoefficient = TotalWagonLateralDerailForceN / TotalWagonVerticalDerailForceN
and the two forces mentioned there are the result of a non simple calculation. Moreover DerailmentCoefficient is multiplied by a correcting factor > 1.

[engmod]

Carlo,

Thank you for finding the code for me.
I now believe there is no bug, just a bad calculation of numwheels in the case of 3 and 5 pack units.

This takes me back to the problems with 3 pack and 5 pack units, I have made up this table:-

axles

3 cars
2-2 2-2 2-2 = 12 axles numwheels 4

3 pack
2 2 2 2 = 8 axles A = nw3 C = nw2 B = nw3 3+2+3 = 8 axles outer cars numwheels 3 inner cars numwheels 2


5 cars
2-2 2-2 2-2 2-2 2-2 = 20 axles

5 pack
2 2 2 2 2 2 = 12 axles A=nw3 C=nw2 D=nw2 E=nw2 B=nw3 3+2+2+2+3 = 12 axles outer cars numwheels 3 inner cars numwheels 2

I will now test those figures on the activity

First test with NO derailment warnings.

[Csantucci]

In effect to be more complete from the code we have:
AA1 = Math.Abs(CarAhead.CouplerForceUSmoothed.SmoothedValue) * (float)Math.Sin(WagonCouplerAngleDerailRad) / WagonNumBogies;
BB1 = MassKG / numAxles;
TotalWagonLateralDerailForceN = Math.Abs(AA1 + BB1 * (BB2 - BB3));
so the wagon lateral derail force is reduced if WagonNumBogies and numAxles are higher.
Therefore I think you are correct in your assumption.