Re: [sumo-user] Flow-Density MFD Plots

[Soheil Keshavarz via sumo-user]

Hello Manikanta,
I'm interested to see if you can finally create good MFDs in SUMO for your
network and if so, how. I have the same issue but I always thought that the
reason for not having the bottom part is having some links that are not
congested or loaded during the simulation so the MFD for the region won't
have the bottom part.

Hope to hear from you soon,
Thanks,
Soheil

On Wed, Dec 13, 2023 at 9:05 PM Desu Venkata Manikanta via sumo-user <
sumo-user@eclipse.org> wrote:

> TCS Confidential
>
> Dear Mirko,
>
> Thank you for your explanation.
>
> I am able to achieve maximum density in my current simulations,  but i
> could see flow is constantly increasing with the density, which is not the
> case as per MFD. I.e bottom U shaped curve is not coming. Speed is also
> constantly decreasing.
>
> Can you help in this.
>
> Regards
> Manikanta
>
> TCS Confidential
> --
> *From:* sumo-user  on behalf of Mirko
> Barthauer via sumo-user 
> *Sent:* Wednesday, December 13, 2023 3:02 PM
> *To:* Sumo project User discussions ; Desu Venkata
> Manikanta via sumo-dev 
> *Cc:* Mirko Barthauer 
> *Subject:* Re: [sumo-user] Flow-Density MFD Plots
>
> *External Email : Be cautious while opening any links or attachments.*
>
> Dear Manikanta,
>
>
>
> the "number" attribute refers to an absolute number of vehicles. If you
> want to vary the flow duration but keep the flow rate constant (and the
> vehicles' distances at insertion all the same), you are better off using
> the "vehsPerHour" attribute. There you enter the number of vehicles you
> would expect for an hour of this flow. Changing the flow duration will
> scale the number of vehicles proportionally.
>
>
>
> The instable part of the fundamental diagram (high density) is difficult
> to reproduce. Even this example
> <https://urldefense.com/v3/__https://sumo.dlr.de/docs/Tools/Visualization.html*fundamental_diagram_from_edgedata__;Iw!!K-Hz7m0Vt54!hkkihl-UNnZOiGlep0mH2AdI7CjpfS667glnQf1ULLB-yo-slC2uNjgP-wYAGEvHljGe_1jddM4uwEEKAURr$>
> in our documentation shows very few data points at high densities.
>
>
>
> Best regards
>
> Mirko
>
>
>
>
>
>
>
>
>
> -Original-Nachricht-
>
> Betreff: [sumo-user] Flow-Density MFD Plots
>
> Datum: 2023-12-13T07:18:50+0100
>
> Von: "Desu Venkata Manikanta via sumo-user" 
>
> An: "Desu Venkata Manikanta via sumo-dev" 
>
>
>
>
>
>
>
> TCS Confidential
>
> Hi Team,
>
> I am confused of two concepts in SUMO.
>
>1. How the insertion of vehicles will happen, if i use same "number"
>in flow command.
>2. For the same number of vehicles, will the simulation end time
>effect the insertion rate.
>
> Basically, I want to plot the MFD by setting the max number of vehicles
> with number attribute in flow. I am using the density value from the
> edgeStats output file. However, I am not able to get the bottom U-shaped
> curve for flow-density graph. I have referred the circular loop in docs,
> but no improvement.
>
> Please guide me how to get this graph.
>
> Regards
> Manikanta
>
> TCS Confidential
>
> =-=-=
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Re: [sumo-user] Flow-Density MFD Plots

[Desu Venkata Manikanta via sumo-user]

TCS Confidential

Dear Mirko,

Thank you for your explanation.

I am able to achieve maximum density in my current simulations,  but i could 
see flow is constantly increasing with the density, which is not the case as 
per MFD. I.e bottom U shaped curve is not coming. Speed is also constantly 
decreasing.

Can you help in this.

Regards
Manikanta


TCS Confidential


From: sumo-user  on behalf of Mirko Barthauer 
via sumo-user 
Sent: Wednesday, December 13, 2023 3:02 PM
To: Sumo project User discussions ; Desu Venkata 
Manikanta via sumo-dev 
Cc: Mirko Barthauer 
Subject: Re: [sumo-user] Flow-Density MFD Plots

External Email : Be cautious while opening any links or attachments.

Dear Manikanta,



the "number" attribute refers to an absolute number of vehicles. If you want to 
vary the flow duration but keep the flow rate constant (and the vehicles' 
distances at insertion all the same), you are better off using the 
"vehsPerHour" attribute. There you enter the number of vehicles you would 
expect for an hour of this flow. Changing the flow duration will scale the 
number of vehicles proportionally.



The instable part of the fundamental diagram (high density) is difficult to 
reproduce. Even this 
example<https://sumo.dlr.de/docs/Tools/Visualization.html#fundamental_diagram_from_edgedata>
 in our documentation shows very few data points at high densities.



Best regards

Mirko









-Original-Nachricht-

Betreff: [sumo-user] Flow-Density MFD Plots

Datum: 2023-12-13T07:18:50+0100

Von: "Desu Venkata Manikanta via sumo-user" 

An: "Desu Venkata Manikanta via sumo-dev" 







TCS Confidential

Hi Team,

I am confused of two concepts in SUMO.

  1.  How the insertion of vehicles will happen, if i use same "number" in flow 
command.
  2.  For the same number of vehicles, will the simulation end time effect the 
insertion rate.

Basically, I want to plot the MFD by setting the max number of vehicles with 
number attribute in flow. I am using the density value from the edgeStats 
output file. However, I am not able to get the bottom U-shaped curve for 
flow-density graph. I have referred the circular loop in docs, but no 
improvement.

Please guide me how to get this graph.

Regards
Manikanta


TCS Confidential

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Re: [sumo-user] Flow-Density MFD Plots

[Mirko Barthauer via sumo-user]

Dear Manikanta,
 
the "number" attribute refers to an absolute number of vehicles. If you 
want to vary the flow duration but keep the flow rate constant (and the 
vehicles' distances at insertion all the same), you are better off using 
the "vehsPerHour" attribute. There you enter the number of vehicles you 
would expect for an hour of this flow. Changing the flow duration will 
scale the number of vehicles proportionally.
 
The instable part of the fundamental diagram (high density) is difficult to 
reproduce. Even this example

 
in our documentation shows very few data points at high densities.
 
Best regards
Mirko
 
 
 
 
-Original-Nachricht-
Betreff: [sumo-user] Flow-Density MFD Plots
Datum: 2023-12-13T07:18:50+0100
Von: "Desu Venkata Manikanta via sumo-user" 
An: "Desu Venkata Manikanta via sumo-dev" 
 
 
 
TCS Confidential

Hi Team,
 
I am confused of two concepts in SUMO.
   1. How the insertion of vehicles will happen, if i use same "number" in
  flow command.
   2. For the same number of vehicles, will the simulation end time effect
  the insertion rate.
Basically, I want to plot the MFD by setting the max number of vehicles 
with number attribute in flow. I am using the density value from the 
edgeStats output file. However, I am not able to get the bottom U-shaped 
curve for flow-density graph. I have referred the circular loop in docs, 
but no improvement.
 
Please guide me how to get this graph.
 
Regards
Manikanta

TCS Confidential
=-=-=
Notice: The information contained in this e-mail
message and/or attachments to it may contain
confidential or privileged information. If you are
not the intended recipient, any dissemination, use,
review, distribution, printing or copying of the
information contained in this e-mail message
and/or attachments to it are strictly prohibited. If
you have received this communication in error,
please notify us by reply e-mail or telephone and
immediately and permanently delete the message
and any attachments. Thank you
 
 
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