Recent content by Tim Leijten

Thanks, but yes, I am aware of that. But you mean by dynamic of the wheel rail interaction, something like the contact between the rails and wheel and stability of that?Thanks

They probably won't indeed ;) But asisde from the fact that i am starting full throttle and wheelslip would probably ocur, does it seem realistic if i got glue wheels? I probably need to go and simulate the starting friction < 3km/h as it is harder to get something moving then keeping it moving...

Thanks, so it is normal a locomotive can go 300km/h without cargo if wikipedia says max is 140? And does this means that train simulator is wrong as it goes only 145km/h without cargo? And here an gif of it accelerating in a simulation i made: https://imgur.com/a/Ccfd1 Is it accelerating normally?

Thanks! So it is normal that this locomotive goes that fast?(without cargo, 300km/h in my graph) Are you saying i should increase Cd a bit?(1.8?) thanks for the explanation, it helps me understanding fcalc, but one question? Are the results i am getting normal for this locomotive? Maybe you have...

Hi, thanks for your reply! You are almost right, the locomotive I am talking about is the ES64F4 or also called the BR189.(But they probably share the same specs) The coefficients are indeed only for the locomotive, as i will calculate the drag for each locomotive seperatly. A C of 100 does...

Where the lines cross in the chart(~95) is the balancing speed of the train in m/s. Multiply by 3.6 and you get ~300(even more now i think about it) The 6400kw is the power rating i got from wikipedia, which i believe is the power delivered(but not sure).

Can some one help me? ^

Says i, I have compared it with train simulators, and I also added a friction curve to it which says my train should go ~300km/h when it should be 140. I think you misunderstood me, i need to calculate tractive effort, which is in Newton(force). I already k ow the power of the train(6400kW)...

Hi there again, I am trying to correctly calculate the tractive effort pf a train, currently i do this: Power/speedMpS = TractiveEffort I got that from here. But it doesn't provide realistic values, so i am wondering, what is the correct way of calculating tractive effort of a train? Thanks

Ah, thanks for the explanations. But what is power used for? Why does it exist? And if i would want to calculate the speed of a train using all values and such, do i need to really know power, or do i just need the tractive effort values? I btw. will go to the library tomorrow, see if they have...

I really still don't understand where you need force for. I should probably find a book or something. Maybe someone can provide a good explanation for not so smart people ;) (if not too much trouble)

Thanks for your reply, but the power of what? I think the train, but if the power of the train goes up, that doesn't have anything to do with the speed of the train right?(Only force, right?)Thanks

Thanks, i mostly understand, I only have 3 more questions: Could you maybe explain the difference between torque and traction? And so the power value is needed to plot the tractive effort curve, but what more is it needed for? And could you maybe tell me a bit what power means in train terms?(I...

Thank you! Thank you! You really helped me a lot! So just to verify, a tractive force is the amount of force the engine can output? And thus like you said, if the car or train would be lighter, but has the same wheels and engine, it will go faster? Thank you for your explanation, it really...

Do you mean that the power is actually the force at a speed of the curve?(I am probably wrong) I believe it is: Torque = force * length (not sure) And T = r x f But i don't really have a clue how i would combine them. Could someone help me?