Normal Modes: Finding Eigenfrequencies

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SUMMARY

The discussion focuses on finding eigenfrequencies corresponding to the normal modes of a system described by the eigenvectors $$(1,0,-1), (1,1,1), (1,-2,1)$$. The participants express confusion regarding the method to calculate these eigenfrequencies, as the source material only provided the results without the underlying process. The need for a clear step-by-step approach to derive eigenfrequencies from given eigenvectors is emphasized.

PREREQUISITES
  • Linear algebra concepts, specifically eigenvalues and eigenvectors
  • Understanding of normal modes in mechanical systems
  • Familiarity with matrix operations and characteristic equations
  • Basic knowledge of differential equations related to oscillatory systems
NEXT STEPS
  • Study the process of calculating eigenvalues from a matrix using the characteristic polynomial
  • Learn how to derive eigenfrequencies from eigenvalues in mechanical systems
  • Explore examples of normal mode analysis in coupled oscillators
  • Investigate the application of these concepts in real-world physical systems
USEFUL FOR

Students in physics or engineering, researchers in mechanical systems, and anyone interested in the mathematical foundations of oscillatory motion and normal mode analysis.

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If I have a system where the following is found to describe the motion of three particles:

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The normal modes of the system are given by the following eigenvectors: $$(1,0,-1), (1,1,1), (1,-2,1)$$
How can I find the corresponding eigenfrequencies? It should be simple... What am I missing?
 
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Is this for schoolwork?
 
berkeman said:
Is this for schoolwork?
This is something I found in a pdf online where it simply asserted what the eigenfrequencies were... and not how to find them.
 
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