Review mass participation.
- [Narrator] In this video, we're going to look…at the use of what's called modal effective mass.…In modal effective mass, in normal modes analysis,…we can't calculate the relative amplitude…of each mode.…It's just a shape, and it's not scalable.…We need a response analysis to see relative amplitude,…either a transient response, or a frequency response.…The exception is for base motion.…That's when something's connected to ground,…and the ground shakes or the ground moves,…and it takes the structure with it.…
In that particular case, if we assume…unit excitation, then we can calculate a term…called the modal effective mass.…Modal effective mass can be calculated…in normal modes analysis,…and the summation of contribution…from every mode in every direction…should equal the actual system mass.…So, we're going to run an exercise…with this lamp post.…And the total mass of this is 1.804 pound mass,…and we'll be looking to sum the contribution…in the X, the Y, and the Z direction.…
And the prediction we get from the normal modes analysis…
- Building and running a normal modes analysis
- Mass modeling in dynamics
- Stiffness modeling in dynamics
- Rigid body modes
- Mass participation
- Advanced Nastran editing
- Transient analysis
- Frequency response analysis
Skill Level Intermediate
Autodesk Inventor Professional: Stress Analysis Toolswith Thom Tremblay25m 53s Intermediate
SOLIDWORKS: Simulation for Finite Element Analysiswith Tony Abbey2h 29m Intermediate
SOLIDWORKS Simulation: Dynamic Analysiswith Tony Abbey2h 40m Intermediate
1. Normal Modes Analysis
2. Key Dynamic Analysis Concepts
3. Advanced Editing in Autodesk Nastran In-CAD
Nastran editing methods7m 26s
4. Transient Analysis
5. Frequency Response Analysis
Next steps1m 35s
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