To assist the ANSYS community in gathering such data, we’ve created a Tips & Tricks video, “Extracting Moments of Inertia for Point Masses. Inertia is a measure of the force that keeps a stationary object stationary, or a moving object. Inertia is the property of matter which resists change in its state of motion. It is a rotational analogue of mass, which describes an object's resistance to translational motion. While removing or suppressing parts is easy enough to do using ANSYS® Mechanical™ Workbench™, how to acquire data such as moments of inertia parameters isn’t as well-known. The moment of inertia is a physical quantity which describes how easily a body can be rotated about a given axis. The element of mass, dm, here is the mass of a shell of radii r, r + dr that is 4r2dr. In other words, it is a much smaller model to solve. where is the mass of the object, and is the distance from the object to the axis of rotation. Let us now calculate the geometric moment of inertia of a uniform solid sphere of radius a, mass m, density, with respect to the center of the sphere. As a result, this approach significantly reduces the size of the overall model as well as the solution time. The remaining parts can be reduced to a point mass where their effects are accounted for, but they are not fully meshed. One question often facing engineers performing any type of simulation analysis is, “How can I simplify my model and still get accurate results?”Ī case in point for FEA analyses: When engineers have a large assembly with multiple parts but are interested in the simulation results of only one of the parts, only the part of interest needs to be fully modeled and meshed.
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