Steam Loco Wheelslip
#11
Posted 08 April 2016 - 11:21 PM
This patch attempts to take these differences into account.
However geared steam locomotives, which do not have "cranked" wheels, and therefore tend to behave like diesels are not impacted by this patch.
To see the impact of the patch, try running a steam locomotive in clear, raining and snowing conditions. It will behave differently under these three scenarios as the coefficient of friction between the rail, and locomotive wheels will be different in each of these three cases. In snowing conditions it may be necessary to reduce the load hauled by the locomotive.
To use this functionality, the "Advanced adhesion model" needs to be selected.
#12
Posted 09 April 2016 - 03:47 AM
#13
Posted 09 April 2016 - 10:52 PM
copperpen, on 09 April 2016 - 03:47 AM, said:
Thanks for the feedback.
I have added a small modification (#3508) to correct this error in the Forces Information HUD.
copperpen, on 09 April 2016 - 03:47 AM, said:
There should have already been red text ("Wheel slip") appearing in the main HUD whenever the locomotive was experiencing a wheel slip scenario.
#14
Posted 10 April 2016 - 02:49 AM
#15
Posted 10 April 2016 - 04:08 AM
copperpen, on 10 April 2016 - 02:49 AM, said:
Can you give a couple of sample freeware locomotives, with download links, to see the effects that you are experiencng?
#16
Posted 10 April 2016 - 05:53 AM
#17
Posted 10 April 2016 - 01:33 PM
Hopefully the Force Information HUD display is now working correctly in #3510.
Most of the information shown in the top section of the Forces HUD is relevant only to the Diesel adhesion model (such as Solver, Substeps, Forces, etc), and not the steam adhesion model, so it is not relevant to show it. For the steam adhesion model, only the Friction Conditions, ie the friction coefficient, is shown in the Forces HUD.
Relevant Forces information for wheel slip is shown in the Steam Locomotive HUD.
#18
Posted 11 April 2016 - 01:51 AM
On a side issue, but one that is having an impact on steam users is a new problem that has surfaced since the introduction of slipping. I was not aware of it until today, but engines that use Variable1 in the sms files no longer have the steam chuff sound, whereas those that use the variable Speed do. Post by hroch in http://www.elvastowe...rs-since-x3504/ refers, and I can confirm this is indeed true.
#19
Posted 11 April 2016 - 03:08 AM
copperpen, on 11 April 2016 - 01:51 AM, said:
I will have a look at that, especially if it eliminates the need for all the info on the steam HUD.
copperpen, on 11 April 2016 - 01:51 AM, said:
Slip will occur once tangential tread force on the wheel exceeds the static friction force between the rail and the wheel.
The two key parameters which influence slip will therefore be:
i) Friction Coefficient which is dependent upon the track conditions
ii) weight on the drive wheels.
This later one will directly influence the FoA (factor of adhesion). The ideal design FoA was > 4.0.
If a locomotive was more prone to slipping, then it is likely that the weight on the drive wheels was too low.
Some other factors that can influence slip are:
i) worn cylinders - this can cause increased tractive effort
ii) worn wheels - can slip at lower static friction forces.
copperpen, on 11 April 2016 - 01:51 AM, said:
Hopefully fixed in #3511
#20
Posted 11 April 2016 - 04:00 AM
http://5at.co.uk/ind...adhesion-2.html
Player, modeler must have the ability to set coefficient of friction as for diesel and electric locomotives. All the steam locomotives do not have the same coefficient of friction.