motors are modelled as a block, instead of a rotor and a stator with exact dimensions, cables, shafts, gearboxes are not modelled correctly, etc.). Why I will have a different answer when I use section properties in Solidworks to calculate Geometric Moment of inertia (Mol) The answer of my hand calculation is 106.57 106 mm4 This problem has been solved You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Reasons behind this are modelling inaccuracies (e.g. You can change the coordinate system it is expressed in in the CAD program.įurthermore, care must be taken to make sure the right material (material density) is selected for the model (as this is not required for any other purposes then static/dynamic load and/or deformation calculations it is often neglected leading to incorrect results)Īlso, please be advised that due to modelling inaccuracies, the calculated inertia tensor is usually only close to the actual value, it does not exactly equal it. I want to knwo the moment of inertia (second moment of area) with respect to the x-z neutral plane (horizontal plane). Make sure that the inertia tensor is expressed in the coordinate system your dynamical model is expecting it to be expressed in. I have a C shaped beam made with a sheetmetal. SolidWorks, Invetor) can calculate the inertia tensor for you for a CAD model.
As this is not practicable by hand, most CAD programs (e.g. Moment of Inertia with SolidWorks ECUSW 8.91K subscribers Subscribe 65K views 10 years ago Mechanics of Materials Using SolidWorks to determine the centroid location and moments of inertia. Motion Analysis (SolidWorks Motion) allows for the calculation of velocities, accelerations. When I use the section properties tool under evaluate it reports moments about the centroid of the part which has been moved from the origin by the presence of the wire. For simple shapes, the moment of inertia is relatively easy. If you do not have a regular shape for which you can find the inertia tensor by a simple formula, you need to obtain this through integration (using the generalised formula). I wish to know the moment about the center of the rod which is located at the origin. You can calculate the inertia tensor for some primitive geometries of a linkage using known formula.
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