Calculating RPM from Torque & Inertia: Seeking Advice

In summary, the conversation is about calculating the RPM of a combustion engine using torque and inertia. The individual is asking if their calculation method is correct and if they need to factor in the engine test on a dyno. They have been generally told that they can find acceleration by subtracting the engine torque from the dyno torque and dividing by inertia, and then add these values for each time interval to find speed. They are also told that they don't need to calculate engine speed since it will be measured during a dyno test.
  • #1
r_james14
2
0
As part of a much larger project I am doing for fun, is it possible to calculate the RPM of a combustino engine from the Torque and Interia.

Reason I am asking is i have a dyno torque result and an engine torque result and i am trying to calcualte the speed. If anyone wants to know why or more information i'll happyily respond.

Thanks In Advance

James
 
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  • #2
i have been generally told if i find net torque

Engine Torque - Dyno Torque and then divide the answer by inertia, i'll have acceleration.

Add these together for each time interval (1ms) ill have speed.

Have i been told correctly?

James
 
  • #3
Is this an engine test on a dyno? The engine torque and dyno torque should be the same; since there's no loss across a flywheel.

Engine speed will be measured on a dyno test, you won't need to calculate this.
 

FAQ: Calculating RPM from Torque & Inertia: Seeking Advice

How do you calculate RPM from torque and inertia?

To calculate RPM from torque and inertia, you can use the formula: RPM = (60 x torque) / (2 x pi x inertia). This formula takes into account the torque in pound-feet and the inertia in pound-feet squared. You can also use a torque sensor and an accelerometer to measure the torque and inertia and calculate the RPM using a data acquisition system.

What is the relationship between RPM, torque, and inertia?

RPM, torque, and inertia are all related to each other through the rotational motion of an object. RPM, or revolutions per minute, is a measure of how fast an object is rotating. Torque is the force that causes an object to rotate, and inertia is the resistance of an object to changes in its rotational motion. Therefore, a higher torque or lower inertia will result in a higher RPM.

Can RPM be calculated for any object?

Yes, RPM can be calculated for any object that is rotating. However, the accuracy of the calculation may vary depending on the complexity of the object and the precision of the measurements for torque and inertia.

How does torque and inertia affect the RPM of a motor?

The torque and inertia of a motor directly affect its RPM. A higher torque or lower inertia will result in a higher RPM, while a lower torque or higher inertia will result in a lower RPM. This is because the motor needs more force to overcome the inertia and maintain its rotational speed.

Can RPM be used to measure the performance of a motor?

Yes, RPM can be used as a measure of the performance of a motor. It is an important parameter in determining the speed and power output of a motor. However, other factors such as efficiency, power consumption, and temperature should also be considered when evaluating the overall performance of a motor.

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