11514

Motions of a Simulated Damped Harmonic Oscillator

Consider a marble free to move inside a bowl. You release the marble at rest from an initial position on one of the walls. This Demonstration determines the subsequent trajectory of the marble. If there is no friction or air resistance, the marble continues to oscillate forever (undamped). If there is resistance, however, the oscillation eventually dies out. How fast it dies out and what the trajectory looks like depend on the properties of the medium.
Here the medium is assumed to behave like a Newtonian fluid, thus resistance is a linear function of velocity. If the medium is air, the marble oscillates, but air resistance causes the oscillation to damp out with time. For water, the oscillation damps out sooner (underdamping). For sugared water, the viscosity increases, and with more sugar, at some point the oscillation decelerates so quickly that it does not complete even a single oscillation (critical damping). If the viscosity is increased even further, for example with glucose/fructose syrup, the marble slowly sinks into the fluid and slowly undergoes exponential decay, until it reaches its equilibrium position (overdamped).
  • Contributed by: Teun Zijp
  • Rijksuniversiteit Groningen

SNAPSHOTS

  • [Snapshot]
  • [Snapshot]
  • [Snapshot]
  • [Snapshot]

DETAILS

Snapshot 1: emphasizes the difference between the undamped oscillator (in a vacuum) and the underdamped oscillator (in air); it can be reproduced by increasing the normal frequency of the maximum
Snapshot 2: is a good overview of all four cases
Snapshot 3: emphasizes that the critically damped oscillator is the limit as the friction constant approaches the normal frequency
For snapshots 1–3, all oscillators have initial position and initial velocity . This is analogous to a marble that is released at rest from one of the walls of a bowl. This is much like bungee jumping.
Snapshot 4: is a different experiment. Here, the initial position is , but the initial velocity is . This is analogous to a marble at the bottom of the bowl given a kick (for the undamped and underdamped cases) or a cannon that fires underwater (critically damped/overdamped).
Reference
[1] T. Zijp. "TEZ Groningen." (Dec 13, 2017) tezgroningen.nl.
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.









 
RELATED RESOURCES
Mathematica »
The #1 tool for creating Demonstrations
and anything technical.
Wolfram|Alpha »
Explore anything with the first
computational knowledge engine.
MathWorld »
The web's most extensive
mathematics resource.
Course Assistant Apps »
An app for every course—
right in the palm of your hand.
Wolfram Blog »
Read our views on math,
science, and technology.
Computable Document Format »
The format that makes Demonstrations
(and any information) easy to share and
interact with.
STEM Initiative »
Programs & resources for
educators, schools & students.
Computerbasedmath.org »
Join the initiative for modernizing
math education.
Step-by-Step Solutions »
Walk through homework problems one step at a time, with hints to help along the way.
Wolfram Problem Generator »
Unlimited random practice problems and answers with built-in step-by-step solutions. Practice online or make a printable study sheet.
Wolfram Language »
Knowledge-based programming for everyone.
Powered by Wolfram Mathematica © 2018 Wolfram Demonstrations Project & Contributors  |  Terms of Use  |  Privacy Policy  |  RSS Give us your feedback
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to Mathematica Player 7EX
I already have Mathematica Player or Mathematica 7+