Moment of inertia - displaced axis

AI Thread Summary
To calculate the moment of inertia for a system of three cylinders with a displaced axis, the parallel axis theorem is essential. The user successfully identified the distance from the center of mass to the revolving axis, which is a crucial step. The discussion highlights the challenge of calculating moment of inertia when the axis does not align with the object's center or surface. Utilizing the parallel axis theorem allows for the adjustment of the moment of inertia based on this distance. This approach effectively resolves the user's query regarding the displaced axis.
finitefemmet
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Hi,

I need some help, I have a system with 3 cylinders (I got the center of mass for the system). Now I need to calculate the moment of inertia for the system.

I have tried to find some examples or general information, but they all show when the axis either is centered within the object or on the surface. This problem has a distance from the system and is not "touching" any surfaces. I figured out distance from the center of mass too the revolving axis. But I can't get my head around how I can solve this with the "displaced" axis so to speak.

Greatfull for every answer,

thanks!
 
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That did the trick;)
 

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