Learn about rigid body modes.
- [Instructor] This video describes how we find…rigid body modes in dynamic analysis,…and how we deal with them.…Rigid body modes, first off let's think about…an elastic mode, something constrained to ground typically.…And it's a frequency which is non-zero,…so here's a first elastic mode and it's 18.4 hertz.…The strain energy developed throughout the structure.…A rigid body mode on the other hand,…is just free motion of an object.…Theoretically the frequency is zero in that particular case.…
An unconstrained structure is just free floating,…has six rigid body modes.…And those modes have zero strain energy,…so it's a strain energy free rigid body motion.…We're going to do an exercise with a block attached…to a plate, and if I forget to attach it properly…then the block floats around with six rigid body modes.…So the solver will find six rigid body modes…and then the first elastic mode is mode seven.…Searching for rigid body modes…can sometimes be a bit difficult.…
If we've got very high frequency elastic modes…
- 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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