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Re: Engine Inertia
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CarGuru > Open discussion > Re: Engine Inertia 2 April 2005 23:06:05
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Re: Engine Inertia

Slowmo 2 April 2005 01:36:04
 Add a moment of inertia to the rotating parts.


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Dave 2 April 2005 02:57:42 [ permanent link ]
 In article <d2kes4$e9l$1@spart­a.btinternet.com>, "Slowmo" <spookyzeba@yahoo.c­om> wrote:>Add a moment of inertia to the rotating parts.

Sounds like the best approach. I'm not sure what a good total
inertia is, but an approx may be to assume a flywheel of about 15
lbs and 12" dia (rough numbers) and use I = 0.5*m*R^2. Then maybe
double it for engine plus other transmission inertias? Anyway, I
rough a value of about 0.16 kg-m2, but have no idea how close this
is. Vary it to give you an acceptable windup time.
Add comment
Dave 2 April 2005 23:06:05 [ permanent link ]
 In article <b73c069e.050402101­9.2a7c0f83@posting.g­oogle.com>, ettore.pancini@gmai­l.com (Ettore Pancini) wrote:
thanks for your suggestion. what i fail to see is how do i use this>scalar value in my equation.>
what i'm doing right now is:>1) get the engine_rpm as f(wheels_rpm, ratios)>2) get the max_torque as f(engine_rpm)>3) apply torque to each wheel>4) step the simulation>
my hope was to be able to change 2) as max_torque = f(engine_rpm,>inert­ia)>am i just plain wrong?

Just as you were going to have the torque act on the drive wheels,
additionally have it act on the engine/flywheel/tra­ns. The basic
eqn is:
Torque = I * alpha (alpha being the angular acceleration)
which in your would be
engine torque = (I*alpha)engine + (I*alpha)wheel
Using the respective terms for both (i.e., engine_rpm and
wheels_rpm).

At least I think that is what you want!
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CarGuru > Open discussion > Re: Engine Inertia 2 April 2005 23:06:05
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