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#trailer

8 posts6 participants1 post today
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TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

How much total drag does my truck create while moving down the highway?

Measure it indirectly!

Run cellphone GPS logger at 1-second interval. Get truck up to speed on flat section of highway, put transmission in neutral, foot off the gas. Let the truck slow down 30 - 45 seconds to get a decent number of data points. Make another data run on same section, but opposite direction to average out effects of wind and any slope.

Import GPS log into spreadsheet.

A linear fit gives you a straight line slope...good enough to determine deceleration...then apply that to F = m * a (you need to know truck's weight) Now you know total drag force at one speed.

Total drag is air resistance (varies with square of speed) plus rolling friction (assume it's constant). OK, do a quadratic/polynomial fit. Now you know rolling friction. Subtract from total drag, and you can determine area-drag (Cd * frontal area) of your truck.

(1 of 2)

Linear fit of GPS log data...to determine deceleration, to determine total drag force of truck at a given speed.
Quadratic/polynomial fit of same data. Now you can determine the rolling friction (a constant value), and the air resistance (varies with speed squared)...and then you can determine the area-drag (Coefficient of drag multiplied by frontal area) of your vehicle.
#Math#Engineering#Science
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Lorker

Glaubt ihr eigentlich, dass größere Filmstudios mit Trailer auf YouTube auch Geld generieren? Ich hätte keinen Bock daran, vor meinem Trailer Werbung zu einem anderen Film zu bekommen. Ist ja irgendwie nicht ganz Sinn der Sache.

· 1 person · Closed
#Umfrage#Film#Trailer
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