![]() I hope this has been of use and I appreciate your patience. The ‘positive’ form merely flips the signs of the off-diagonal terms, which can be more convenient but is not conventional. The ‘negative’ terminology comes from the fact that the off-diagonal terms in the conventional inertia tensor have a minus sign (displayed in equation 4 at ). ![]() Specifically, if ‘I’ is the inertia tensor and ‘v’ is the angular velocity vector, then the angular momentum is ‘I * v’ and the kinetic energy is ‘0.5 * v-transpose * I * v’. Mark as New Bookmark Subscribe Mute Subscribe to RSS Feed Print Report 06-27-2005 02:29 PM. An object’s Centre of Gravity or CG is its balancing point, if an object was supported at this point then it would be in equilibrium and not move. in reply to: aluminum are us 06-27-2005 02:29 PM. I know that all engineers loved taking Mechanics of Materials in college where finding the mass moment of inertia, radius of gyration, and centroid were. The conventional moment of inertia tensor (the ‘negative’ one) is the 3 by 3 matrix that, when combined with an angular velocity vector, gives the angular momentum and the kinetic energy. Does Autocad LT calculate the moment of inertia of an area Report. Regarding moments of inertia, they are a measure of how much a body spreads out from its centre of gravity and hence how much angular momentum and kinetic energy it would have for a given angular velocity. Many thanks Johnson Shiue () Software Test Engineer. I think you are looking for Principal Moment of Inertia values at the bottom. You can read more about its mathematical definition at Hi Yes, right-click on the part node at the top in the browser -> Properties -> Physical. Im writing my own code and at some point I will need to determine the moment of inertia. What I am interested in is the method used by autocad to calculate this. Which then you can easily calculate by hand. If you were to somehow freely pivot the body about that point, the body wouldn’t try to twist under gravity. However I know Plain Jane AutoCAD and all its vertical sister programs can easily calculate geometric center. The centre of gravity of a body is the point at which the body is perfectly balanced, the position in space where gravity appears to act on said body. These are good questions about the centre of gravity and moments of inertia.
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