Re: [sumo-user] Electric vehicle airDragCoefficient parameter

[The div <div@xxxxxxxx>]

The air drag coefficient applies to the relative velocity of the vehicle to the air mass - a headwind of 5km/s means the effective speed of the vehicle for drag calculation is increased by 5km/s

A tailwind of 5km/s means that the effective speed of the vehicle for drag computation is reduced by 5km/s

You can't model this by varying the speed though - as that would impact the radial and rolling  drag computations.

I guess you'd have to apply an effective velocity just to the air drag computation - you might be able to adjust for wind direction if you can work out the compass direction of the vehicle - rather than the angle relative to the lane!  

Sounds fun :) 
Cheers
Div








-------- Original Message --------
On 3 Dec 2021, 13:18, Iñaki Cejudo Fresnadillo via sumo-user < sumo-user@xxxxxxxxxxx> wrote:

Sorry, I have realised that I have made a mistake in my aproach. The speed facotr doesn't refer to the air but to the object in movement. I guess I'll have to check the default wind speeds that are used to get this airDragCoefficient value.

El vie, 3 dic 2021 a las 14:08, Iñaki Cejudo Fresnadillo (<icejudo@xxxxxxxxxxxxx>) escribió:

Hi,

I would like to simulate different wind speeds for an electric vehicle. I was thinking of editing the airDragCoefficient to simulate this. 

The aproach would be finding in source files where this coefficient is aplied to the drag force formula, checking the wind speed factor that has been set, and changing this wind speed to simulate different situations. Does it sound feassible? Where is this specific code part in source files? Thank you.

Regards, 

Iñaki

--

Iñaki Cejudo Fresnadillo
Research Assistant | Ayudante de Investigación

icejudo@xxxxxxxxxxxxx
+[34] 943 30 92 30

Intelligent Transport Systems and Engineering | Sistemas de Transporte Inteligentes e Ingeniería

  

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--

Iñaki Cejudo Fresnadillo
Research Assistant | Ayudante de Investigación

icejudo@xxxxxxxxxxxxx
+[34] 943 30 92 30

Intelligent Transport Systems and Engineering | Sistemas de Transporte Inteligentes e Ingeniería

  

member of: 

La información que contiene este mensaje y sus adjuntos son confidenciales y están dirigidos exclusivamente a sus destinatarios. Si recibe este mensaje por error, se ruega nos lo comunique y proceda a su borrado.

The information contained in this electronic message is intended only for the personal and confidential use of the recipients designated in the original message. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer.