How can I simulate Inertia in Simulink?
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Igor Batoukhtine
on 8 Apr 2016
Commented: Paul
on 27 Nov 2020
Hello,
I got the following images:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/160514/image.png)
Here I try to simulate the inertia of my system and translate it to rpm. The result is as follows:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/160516/image.png)
I don't get why my rpm doesn't follow my torque line.. The initial value for my integrator is zero (speed at t(0) = 0). Could someone help me with this
2 Comments
Babatunde Tolu Ogungbe
on 26 Nov 2020
Following the above makes me believe i am in the right place.
Please i need help to Simulate Inertia of a biogas plant. the biogas plant consist of (Anaerobic digestion,Microturbine with PMSG). I would be glad if i could get help.
Accepted Answer
Sebastian Castro
on 8 Apr 2016
Edited: Sebastian Castro
on 8 Apr 2016
Your model and response seem fine to me. Dividing the input torque by the moment of inertia is correct.
The acceleration you're providing is always a positive value ranging from 1250 to 1700 N*m, so your speed should keep increasing with a slightly varying positive slope.
In reality, there would be other subtractive terms before the inertia division corresponding to stiffness, damping, friction, etc. Maybe this is what's missing from your model that you would expect to see?
- Sebastian
3 Comments
Sebastian Castro
on 9 Apr 2016
Well, a pump usually will have some sort of friction that depends on the speed of the pump. Generally, the faster the speed, the higher the friction force.
The simplest friction model would be viscous friction, or a damper:
Torque = - C * velocity
Where C is a damping coefficient. Try adding that to your model?
- Sebastian
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