- #1
calan
- 4
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Given the following instantaneous parameters and constants...
Known:
d = air density = 1.24
Cr = rolling resistance coeffecient = 0.015
FA = frontal area = 1.48
Cd = drag coefficient = 0.29F
G = gravity (mps2) = 9.80665
pi = 3.1415926
m = vehicle mass (Kg) = 1542
DL = drivetrain loss = .2
V = velocity (m/s)
A = acceleration (m/s/s)
Unknown:
F = vehicle force (KgMps2)
T = Torque (KgM)
HP = horsepower
Unknown, but can be found if needed:
Tire radius
Current gear and gear ratio... what would be an equation that would let me estimate instantaneous engine torque (or HP) at the wheels?
So far (I think) I have worked out these terms:
rollDrag = G * Cr * m
airDrag = .5 * Cd * FA * d * V * V
F = (m * A) + airDrag + rollDrag
Assuming that ^ is correct, this is where I'm stuck.
Any help is greatly appreciated. I'm sure I'm just over-thinking it or something, but I've drawn a blank and have been spinning my wheels (so to speak) on this for a couple of days now.
Thanks in advance!
Known:
d = air density = 1.24
Cr = rolling resistance coeffecient = 0.015
FA = frontal area = 1.48
Cd = drag coefficient = 0.29F
G = gravity (mps2) = 9.80665
pi = 3.1415926
m = vehicle mass (Kg) = 1542
DL = drivetrain loss = .2
V = velocity (m/s)
A = acceleration (m/s/s)
Unknown:
F = vehicle force (KgMps2)
T = Torque (KgM)
HP = horsepower
Unknown, but can be found if needed:
Tire radius
Current gear and gear ratio... what would be an equation that would let me estimate instantaneous engine torque (or HP) at the wheels?
So far (I think) I have worked out these terms:
rollDrag = G * Cr * m
airDrag = .5 * Cd * FA * d * V * V
F = (m * A) + airDrag + rollDrag
Assuming that ^ is correct, this is where I'm stuck.
Any help is greatly appreciated. I'm sure I'm just over-thinking it or something, but I've drawn a blank and have been spinning my wheels (so to speak) on this for a couple of days now.
Thanks in advance!
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