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Thread: Anyone want to comment?

  1. #1
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  2. #2
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    Default RE: Anyone want to comment?

    Comment on what?
    [b]Dave Nelson
    SLW Route Design: The Cal-P, 1950.[b]
    http://i3.photobucket.com/albums/y51...cing_Genma.gif
    http://i3.photobucket.com/albums/y51...s/4ad3d633.jpg

  3. #3
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    Default RE: Anyone want to comment?

    Oops, go to the new tech spec section and look at the charts.

  4. #4
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    Default RE: Anyone want to comment?

    It's like the Rosetta Stone of MSTS physics.

    Chris

  5. #5
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    Default RE: Anyone want to comment?

    Well on my PC it's too small to read and when enlarged, too fuzzy. Not of much use this way.

    [b]Dave Nelson
    SLW Route Design: The Cal-P, 1950.[b]
    http://i3.photobucket.com/albums/y51...cing_Genma.gif
    http://i3.photobucket.com/albums/y51...s/4ad3d633.jpg

  6. #6
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    Default RE: Anyone want to comment?

    >Well on my PC it's too small to read and when enlarged, too
    >fuzzy. Not of much use this way.

    Dave,

    Did you save the PNG files? The original PNG files are both about 1130x1500 and fairly easy to read. I printed them out on legal size paper so I could scribble a few notes. :)
    ...rich

  7. #7
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    Default RE: Anyone want to comment?

    Huh... that's weird. I saved them earlier and they were a fuzzy mess. Went back a moment ago, saved them again, and they're fine. I dunno what happened.

    Anyway... stuff to study. Bye! :)

    **edit**
    Oh... answer: first save was a .gif, second save was a .png file. BIG difference in clarity.

    [b]Dave Nelson
    SLW Route Design: The Cal-P, 1950.[b]
    http://i3.photobucket.com/albums/y51...cing_Genma.gif
    http://i3.photobucket.com/albums/y51...s/4ad3d633.jpg

  8. #8
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    Default RE: Anyone want to comment?

    George made one mistake in his pictorial representation of the equations. On the upper right if the condition v*K<Vmtf is true he had:

    F = ((Fmax - Fcmax)*v*K/Vmtf) + Fcmax

    It should be:

    F = ((Fmax - Fcmax)*v/K*Vmtf) + Fcmax

    The constant K should be in the denominator, not the numerator.

    Also, it seems that diesel-electric locomotives ignore the DieselEngineSpeedOfMaxTractiveEffort parameter completely (the sim sets it to 0). If you look at the flow chart, if DieselEngineSpeedOfMaxTractiveEffort = 0, then MSTS basically uses F=MaxForce until velocity=MaxPower/MaxForce, and F=MaxPower/velocity above that speed. In other words, diesel locomotives behave as constant tractive effort/constant power machines. According to the flowchart they also don't use MaxContinuousForce since the equations in which MaxContinuousForce is present only apply if DieselEngineSpeedOfMaxTractiveEffort > 0.

  9. #9

    Default RE: Anyone want to comment?

    Hi Joseph !

    George thanks you for mentioning this and asks:

    [font color=blue]Diesel engine has general KUJU bug and major part of equation is ignored. But one question, what is physical meaning of K value?[/font]

    If you or anybody else knows the answer to that then could you please e-mail it to him using his e-mail function on the Links page here:
    http://mstsbin.uktrainsim.com/eng/eng.html

    Thanks, O t t o.


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