Mass Spring System: Find Natural Frequencies & Mode Shapes

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SUMMARY

The discussion focuses on deriving the natural frequencies and mode shapes for a mass spring system where two masses, m1 and m2, are equal (m1 = m2 = m). Participants emphasize the importance of performing a free body analysis and formulating the force and acceleration equations for each mass. The key steps include determining the forces in the springs when mass m1 is displaced downward by a distance x1, calculating the net vertical force, and establishing the corresponding differential equation that governs the system's motion.

PREREQUISITES
  • Understanding of mass spring systems and their dynamics
  • Familiarity with differential equations
  • Knowledge of free body diagrams and force analysis
  • Basic principles of oscillatory motion
NEXT STEPS
  • Study the derivation of natural frequencies in coupled oscillators
  • Learn about the method of solving second-order differential equations
  • Explore the concept of mode shapes in mechanical systems
  • Investigate the effects of damping on oscillatory systems
USEFUL FOR

Students in mechanical engineering, physics enthusiasts, and anyone studying dynamic systems and vibrations will benefit from this discussion.

acpower89
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Homework Statement


Obtain the expressions for the natural frequencies and mode shapes for the case where m1=m2=m.

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Homework Equations




The Attempt at a Solution



I apologise for not making an attempt, this is just unlike anything I've seen.

I'd appreciate if anyone could demystify this problem.
 
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Do the usual free body analysis and write the force/acceleration equations for each of the two masses.
 
Consider mass m1. If at some time t it is displaced vertically downward wrt m2 by an amount x1, what are the forces in the springs? What is ythe net vertical force on it? What is its displacement relative to the ground? What is its acceleration? What differential equation does that give you?
 

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