Elvas Tower: Problem with long trains ( record consists ) - Elvas Tower

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Problem with long trains ( record consists ) Train wil not depart Rate Topic: -----

#11 User is online   Laci1959 

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Posted 10 April 2021 - 07:19 AM

 vince, on 09 April 2021 - 08:30 PM, said:

This makes sense when considering the type of coupling used. Link coupling = no slack. This seriously limits train length..
I don't 'know' if the link couplers (no slack ) are in use in all countries but MSTS did indeed make allowance for them in the wag file parameter:
CouplingHasRigidConnection – set this to 1 for wagons that have rigid, rather than flexible couplings. ref:MSTS Tech Docs

regards,
vince


regards,
vince


The "CouplingHasRigidConnection" setting is recommended for multi-part multiple units such as KISS, FLIRT. In the past, the rear and front car switches could also be set with the MSTS. In the assembly, the vehicles used the "Bar" setting with each other, with the "CouplingHasRigidConnection" modifier, and the "Automatic" setting at the two extremes, also with the CouplingHasRigidConnection "modifier.
I’m not sure, but OR no longer supports that.

Greetings: Laci 1959

#12 User is offline   darwins 

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Posted 10 April 2021 - 01:16 PM

Sorry. I think the file has to be approved before the download link will work.

http://www.elvastowe...culator-for-or/

For the Class 373 these are the total values for a trainset from a research paper

For Eurostar Class 373 20-car 2+18 M=867 L=394 (Rochard):
ORTSDavis_A = 6550
ORTSDavis_B = 82.0
ORTSDavis_C = 23.9

Which to my own mind looks a very high value for ORTSDavis_C

The values given by others for TGV resistance is much lower

For TGV -POS set M=427 (Jernbanverket):
ORTSDavis_A = 2760
ORTSDavis_B = 198
ORTSDavis_C = 7.41

For TGV -Duplex set M=424 (Alvarez):
ORTSDavis_A = 2700
ORTSDavis_B = 115
ORTSDavis_C = 6.93

For TGV - Réseau set (SYSTRA):
ORTSDavis_A = 2700
ORTSDavis_B = 104
ORTSDavis_C = 6.61

For TGV -Réseau set M=490 (Alvarez):
ORTSDavis_A = 3800
ORTSDavis_B = 140
ORTSDavis_C = 6.61

For TGV -Atlantique set M=416 (Alvarez):
ORTSDavis_A = 2700
ORTSDavis_B = 118
ORTSDavis_C = 7.32

For TGV PSE set (Sjokvist):
ORTSDavis_A = 3900
ORTSDavis_B = 148
ORTSDavis_C = 8.19

For TGV PSE set (Allenbach/Guiheu):
ORTSDavis_A = 2540
ORTSDavis_B = 120
ORTSDavis_C = 7.41

For TGV PSE set M = 418 (Alvarez):
ORTSDavis_A = 2350
ORTSDavis_B = 111
ORTSDavis_C = 6.93

So even allowing for the extra length of the Eurostar I find it hard to believe the ORTSDavis_C should be more than about 12 for the whole train.

#13 User is offline   darwins 

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Posted 11 April 2021 - 02:33 AM

These are my calculations for the end power cars:
https://i.imgur.com/MmM7yQc.jpg
ORTSDavis_A ( 678 )
ORTSDavis_B ( 13.6 )
ORTSDavis_C ( 2.32 )

ORTSWagonFrontalArea ( 89ft^2 )
ORTSDavisDragConstant ( 0.00117 )
ORTSTrailLocomotiveResistanceFactor ( 0.355 )

There seems little point in using numbers more accurate than two or three significant figures. If you look at the values different researchers give for the same type of TGV, you will realise that there is a considerable margin of error in different measurements and estimates in the real world.

#14 User is offline   Weter 

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Posted 11 April 2021 - 05:08 AM

chain-screw link along with buffers allows spring too.
Automatic couplers can be spring(for freight cars) semi-rigid (for passenger cars and old EMUs) and rigid.
https://ru.wikipedia.../%D0%A1%D0%90-3
http://www.modelzd.r...cepka-sa-3.html
https://yandex.ru/vi...987763210879910

#15 User is offline   NickonWheels 

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Posted 12 April 2021 - 03:13 AM

ORTSTrailLocomotiveResistanceFactor looks interesting.

When coupling together two locomotives of the same type the player engine has higher friction when moving, anything behind has some factor causing a less steep curve. But I observed some different behavior in this.

Once I tried a similar high-speed train where the power cars had the same Davis values but at a certain speed the friction value of the rear power car is even less than the intermediate cars which had smaller Davis values. Can ORTSTrailLocomotiveResistanceFactor enhance this?

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