How to Solve a Three Mass Four Spring System for Transverse Vibration

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SUMMARY

The discussion focuses on solving a three mass, four spring system for transverse vibrations, specifically computing normal modes and natural frequencies. Participants emphasize the importance of assuming constant tension in the string, neglecting gravity, and treating the string as weightless. The conversation references a similar system for longitudinal vibrations, providing a foundation for understanding transverse dynamics. Key insights include the necessity of showing attempted solutions to receive targeted assistance.

PREREQUISITES
  • Understanding of normal modes in mechanical systems
  • Familiarity with natural frequency calculations
  • Knowledge of transverse vibrations in strings
  • Basic principles of tension in elastic systems
NEXT STEPS
  • Study the derivation of normal modes for a three mass, four spring system
  • Learn about the mathematical treatment of transverse vibrations in strings
  • Explore the concept of tension in vibrating systems
  • Review longitudinal vs. transverse vibrations in mechanical systems
USEFUL FOR

Students and educators in mechanical engineering, physics enthusiasts, and anyone studying vibrational dynamics in multi-mass spring systems will benefit from this discussion.

mezacom
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Homework Statement


Three equal masses are attached to a string at equal distances from one another and from the ends, which are rasten to supports so that there is a tension T in the string. Compute normal modes and natural frequencies of small transverse vibrations about equilibrium. Describe the normal modes.
HINT: Assume the tension constant, neglect gravity and asume the string weightless.

similar systems:
https://ccrma.stanford.edu/CCRMA/Courses/152/vibrating_systems.html

Homework Equations





The Attempt at a Solution


 
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Welcome to PF!

Hi mezacom! Welcome to PF! :wink:

This is a Three-Mass, Four-Spring System, like the Two-Mass, Three-Spring System in your link.

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 
I know how to solve a three mass four spring system for longitudinal vibration. I have solved it and photo it and you can find it in the link.
I also photo how I think I should start my exercise with transversal vibration.
Did I start solving my problem correctly.
I don’t know how to get rid of all thetas.

http://www.mypicx.com/05272010/mass_spring_solved/
 

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