Hi Simmer
anbei einige Gedanken zu "Adheasion" im Wagon-Teil:
Haftung Rad/Schiene [MSTS Wagon-Teil = "Adheasion" ], das ist die Haftreibungskraft (Adhäsionskraft) Rad/Schiene
MÜNormal = 0,36 (Richter: 0,3 bis 0,4 bei Diesel + Elektro)
(Richter: 0,2 bis 0,3 bei Stangenloks)
MÜSand = 0,43 (Richter: 0,5)
MÜSlip = 0,18 (Richter: 0,06, MüEis: 0)
Ergibt beim Taurus:
AdhKraft = Gewicht (in t) * 9,81 * MÜ
AdhKraftNormal : 86t *9,81 * 0,36 = 303,7 kN
AdhKraftSand : 86t *9,81 * 0,43 = 362,7 kN
AdhKraftSlip : 86t *9,81 * 0,18 = 151,9 kN
AdhKraftSlip : 86t *9,81 * 0,06 = 50,6 kN (Richter-Wert)
Lt. Richter werden im MSTS diese Formeln angewendet:
AdhKraftNormal = Wert 2 * Wert 3 * Gew / NumWheels
AdhKraftSand = (MÜ_NORMAL / MÜ_SAND) * Wert 3 * Gew / NumWheels
AdhKraftSlip = Wert 1 * Wert 3 * Gew / NumWheels
Für einen Taurus mit 86 t Gewicht und 4 Achsen ergibt sich folgendes:
Adhäsionswert 3
= ([AdhKraft_Sand] * [Achsanzahl]) * [MÜ_SAND]/ ([GewRechnung] * 9,81 * ([MÜ_NORMAL]
AdhKraft_Sand = [GewRechnung] * 9,81 * [MÜ_SAND]
= [Achsanzahl] * [MÜ_SAND]2 / [MÜ_NORMAL]
= 4 * 0,432 / 0,36 = 2,054
Adhäsionswert 2
= AdhKraftNormal * NumWheels / Gew * 9,81 * Wert 3
= 303,7 *4 / 86 * 9,81 * 2,054 = 0,701
Adhäsionswert 1
= AdhKraftSlip * NumWheels / Gew * 9,81 * Wert 3
= 151,9*4 / 86 * 9,81 * 2,054 = 0,350
Von Rudolf Richter:
The adheasion parameter has four values, 1 to 3 are used as shown below, number 4 is not used:
• General: Tractive effort = factor of adhesion * locomotive weight on drivers / NumAxles
• Tractive effort (slipping) = {(first value) * third value/2) * (locomotive weight)} / (NumWheels/2) = (first value) * (third value) * (locomotive weight) / (NumWheels)
• Tractive effort (normal) = {(second value) * (third value/2) * (locomotive weight)} / (NumWheels/2) = (second value) * (third value) * (locomotive weight) / (NumWheels)
• Tractive effort (sanding) = 0.95 * (third value/2) * (locomotive weight)} / (NumWheels/2) = 0.95 * (third value) * (locomotive weight) / (NumWheels)
The three values (the fourth is not used) generate the adhesion value by multiplying.
Compared with reality, the so called “adheasion values” are not correct.
The factor of adhesion is a constant of nature, which can be found in locomotive builder’s handbooks2,7 In these textbooks you’ll find the following data:
Factor of adhesion under normal conditions: mü = 0.3 – 0.4 (continuous force, f.i. diesels)
Factor of adhesion under normal conditions: mü = 0.2 – 0.3 (oscillating force e.g. steamers)
Bad conditions (fog, rain, leafs) mü = 0.06
Ice mü = 0
Sanding mü = 0.5
These facts in mind, for real conditions I suggest values like:
First value: 0.1 by multiplying you get for adhesion 0.05, a real value 2, 7
The multiplication in the formulas in mind, the other values cant be proper changed for real conditions. I suggest “0.5” for sanding (in reality you get an adhesion of 0.45 while sanding), so you can compute for the second value values between 0.4 and 0.6, which is reflecting reality. So nice adheasion values are: 0.1 0.6 0.5 x Use for fine tuning NumWheels.
Bianchi310: ich habe Dir die Eng/Wag-Datenbank geschickt, aber noch keine Reaktion von Dir gespürt.
Gruß
Alf
