how fast do the pistons travel at 9k per minute?
11-13-2006, 05:21 PM
#31
Ok here are some plots based on the calculations i did.
The max velocity in tha AP1 is 41.0 m/s at 76 degrees from top dead center.
The max velocity in the AP2 is 39.7 m/s at 74 degrees from top dead center.
The max acceleration in the AP1 is roughly 47500 m/s^2 at top dead center
The max acceleration is the AP2 is roughly 41500 m/s^2 at top dead center
Ok first this is the model that was used basicaly a slider crank mechanism.
This model assumes that the engine is being driven by the crank.
This is mainly a theoretical issue. This double hump characturistic appears as you shorten the rod so much that it is theoreticaly equal to the crank radius. Even though this is obviously impossible the piston essentially would come to a "sudden" stop at 90
The max velocity in tha AP1 is 41.0 m/s at 76 degrees from top dead center.
The max velocity in the AP2 is 39.7 m/s at 74 degrees from top dead center.
The max acceleration in the AP1 is roughly 47500 m/s^2 at top dead center
The max acceleration is the AP2 is roughly 41500 m/s^2 at top dead center
Can you post the formulas you have for velocity and accceleration?
This model assumes that the engine is being driven by the crank.
It's fascinating that the piston behavior at the top of the stroke is so different from at the bottom. I wouldn't have expected that...
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