From the course: Autodesk Nastran In-CAD: Dynamic Analysis

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Mass modeling in dynamics

Mass modeling in dynamics - Nastran In-CAD Tutorial

From the course: Autodesk Nastran In-CAD: Dynamic Analysis

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Mass modeling in dynamics

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- [Instructor] In this video we're going to take a look at things which affect the mass distribution within a dynamic analysis. In other words, mass modeling. Now mass modeling, we can think about element density, so that's like a material density. It's applied via the material property. It's input in the Nastran In-CAD tree, so we're going to find we pick up a material. We're going to use typically carbon steel. There'll be a density associated with that. So here's the carbon steel, and the value is a mass density. So we see the term highlighted in there. Now it's input in the Inventor model tree. If we go straight to the geometry, the value there is a weight density. And we can see there it's described as pound per cubic inch, but it is a pound weight. Now we need to consider mass versus weight, particularly if we're working in the US. In US units, the traditional units are pound, force, inch, seconds, and that pound force is a weight, and that's the fundamental quantity. Now…

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