Pendulum with spring instead of rod

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    Pendulum Rod Spring
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Discussion Overview

The discussion revolves around the complexities of modeling a pendulum system that utilizes a spring instead of a solid rod. Participants explore the implications of this design change on the dynamics of the system, particularly in terms of degrees of freedom and methods of analysis.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that solving the problem with a solid rod is manageable using numerical methods like Euler's method or Runge Kutta, but the spring complicates the analysis.
  • Another participant points out that the spring introduces an additional degree of freedom (the extension of the spring) alongside the angular displacement, making the problem more complex.
  • There is a suggestion to use Lagrangian mechanics to derive the equations of motion for this system, indicating that multiple equations may be necessary.
  • A request is made for assistance in finding a numerical model to calculate the position of the pendulum over time, emphasizing the unique characteristics of the spring-based design.

Areas of Agreement / Disagreement

Participants generally agree that the spring introduces significant complexity to the pendulum system, but there is no consensus on the best approach to model it or the specific equations of motion required.

Contextual Notes

The discussion highlights the need for clarity on the assumptions involved in modeling the spring-pendulum system, as well as the potential for multiple valid approaches to derive the equations of motion.

nneutrino
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When we have solid rod instead of spring I can solve this problem in Microsoft Excel either with Euler´s method or Runge Kutta method, but that spring makes this problem hard for me.
 
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That problem is a lot more complicated. Basically, instead of the one degree of freedom that you had for the simple pendulum (the angle), you have two (the angle, and the extension of the spring). The standard way to solve such a problem is to obtain the equations (note that I said it in plural) of motion with, say, Lagrangian mechanics. To keep this thread dedicated to its original title (Non-harmonic oscillation of pendulum) it would probably be better if you created a new thread with this question to keep the forum neatly organized. :oldbiggrin:
 
Hi,
Can you help me to find out appropriate numerical model of calculating position depending on time of special pendulum. It is basically gravity pendulum but we have a spring instead of rod. (picture)
300px-Simple_gravity_pendulum.svg.png
 
Thread closed for Moderation...

Edit (fresh_42): Post #3 is actually the opening post, which has been separated from another thread.
Thread re-opened.
 
Last edited by a moderator:

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