Re: [sumo-dev] Miscalculation of Rotational Kinetic Energy, Curvature En

[Burford Furman <burford.furman@xxxxxxxx>]

Thank you, Michael! We appreciate all the work that you and the developers have put into making SUMO such a useful tool.

Burford

On Thu, Oct 15, 2020 at 12:53 PM Michael Behrisch <oss@xxxxxxxxxxx> wrote:

Hi,
thanks for the report and sorry for the delay. Unfortunately we have
several places in the code which calculate energies. I suppose you are
referring to HelpersEnergy::compute
https://github.com/eclipse/sumo/blob/master/src/utils/emissions/HelpersEnergy.cpp#L57
?
This function seems to have some problems indeed not only the ones you
mention but in total it should return power and not energy because the
time scaling is done outside the function when used as an emission
model. For the battery device however energy is expected. Sorry for the
hassle, it is now tracked here: https://github.com/eclipse/sumo/issues/7695

Thanks again for finding out!

Best regards,
Michael

Am 11.10.20 um 06:40 schrieb Burford Furman:
> Hello,
>
> We are running SUMO ver 1.6.0 under Windows 10, and we just discovered
> that the SUMO source code is calculating the Rotational Kinetic Energy,
> the Curvature Energy Loss, and the Constant Auxiliary Energy Demand
> incorrectly. The SUMO documentation lists the correct equations, but for
> some reason the source code is not correct in ver 1.6.0. Our findings
> are summarized below:
>
> image.png
>
> image.png
>
> Thank you.
>
> Burford Furman
>
> --
> ************************************************************************************
> Burford J. Furman
> Professor
> Department of Mechanical Engineering
> San Jose State University
> One Washington Square
> San Jose, CA 95192-0087
> Phone: (408) 924-3817 Email: Burford.Furman@xxxxxxxx
> <mailto:Burford.Furman@xxxxxxxx>
> Web page: http://www.sjsu.edu/people/burford.furman/
> <http://www.engr.sjsu.edu/bjfurman/>
> ************************************************************************************
> "We must remember that intelligence is not enough. Intelligence plus
> character--that is the goal of true education." - Dr. Martin Luther King
> Jr., 1947
>
> "/Instrumental or mechanical science
> is the noblest and above all others, the most useful.../" - Leonardo da
> Vinci
>
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--

************************************************************************************
Burford J. Furman
Professor
Department of Mechanical Engineering
San Jose State University
One Washington Square
San Jose, CA 95192-0087
Phone: (408) 924-3817 Email: Burford.Furman@xxxxxxxx
Web page: http://www.sjsu.edu/people/burford.furman/
************************************************************************************
"We must remember that intelligence is not enough. Intelligence plus
character--that is the goal of true education." - Dr. Martin Luther King Jr., 1947

"Instrumental or mechanical science
is the noblest and above all others, the most useful..." - Leonardo da Vinci