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Post by RingedFiber442 on Dec 15, 2023 8:59:28 GMT
Hi all,
Question for the VDL team: do any of you happen to have some data / a graph for the deceleration of a C stock under rheostatic braking? Thought I might ask here as I assume you programmed the acceleration and deceleration for your trains. I'll also ask on District Dave's forum, but I'm currently waiting for account verification there.
If anyone could please help in this regard, I'd be very thankful.
Best wishes,
RingedFiber442.
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Post by Xavier on Dec 15, 2023 9:49:18 GMT
Jimi is the person to ask about the C Stock scripting.
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Post by Jimi on Dec 15, 2023 20:39:25 GMT
I dug into my sources and got the blueprint info re the Rheo braking system. There are a load of parameters, and also a csv file defining Rheo brake effort (0...1.0) vs speed (0-50mph). I'll cite both below. If there's something else specific you need, yell and I'll dig more.
I do have the actual rheo curves for an LT118 motor (force in kN, speed in Kph) - see post below.
SIM Blueprint Main EP brake section: Max force as percent of vehicle weight 140 Apply/release rates 20psi/sec Anti-slip brake cyl pressure 5
SIM Blueprint Rheo Brake section: Delay before engaging 0.25 Max effective speed 35 Auto cut in speed 42 Minimum usable speed 10 max force 5 Max resistor current 1000
RHEOBRAKEEFFORTvsSPEED.csv (Speed 0...50, effort 0...1.0) 0 0 5 0.2 10 0.3 15 1 40 1 45 0.5 50 0
As regards EP brake as a fraction of max possible braking, I used 5 values: Brake1 = 0.43 (Rheo1+hold) Brake2 = 0.57 (Rheo2 + EP min) Brake3 = 0.71 (Rheo2 + EP nor) Brake4 = 0.86 (Rheo2 + EP max) Brake 5 = 1.0 (Emerg)
So Brake 1 is Rheo1+ EP hold which (when above 20mph) gives a mix of EP and Rheo, and below 20mph gives just EP. It's enough to hold the train at a stand. The other brake notches apply the cited amount of brake plus Rheo as defined in the RheoEffort vs Speed curve.
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Post by Jimi on Dec 15, 2023 21:14:13 GMT
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