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Related Concept Videos

Types of Damping01:20

Types of Damping

6.5K
If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
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Damped Oscillations01:07

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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
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Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Reflection of Waves01:07

Reflection of Waves

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Properties of DTFT I01:24

Properties of DTFT I

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In signal processing, Discrete-Time Fourier Transforms (DTFTs) play a critical role in analyzing discrete-time signals in the frequency domain. Various properties of the DTFTs such as linearity, time-shifting, frequency-shifting, time reversal, conjugation, and time scaling help understand and manipulate these signals for different applications.
The linearity property of DTFTs is fundamental. If two discrete-time signals are multiplied by constants a and b respectively, and then combined to...
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Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
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Related Experiment Video

Updated: Aug 7, 2025

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

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Damping-Driven Time Reversal for Waves.

Samuel Hidalgo-Caballero1,2, Surabhi Kottigegollahalli Sreenivas1,3, Vincent Bacot1

  • 1Institut Langevin, ESPCI Paris, Université PSL, CNRS, Paris, France.

Physical Review Letters
|March 10, 2023
PubMed
Summary
This summary is machine-generated.

We demonstrate a novel method to reverse wave propagation using a brief, intense damping pulse in a lossless medium. This technique effectively reverses wave direction and time evolution, applicable even in complex systems.

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Area of Science:

  • Physics
  • Wave phenomena
  • Non-equilibrium systems

Background:

  • Damping is typically linked to irreversible processes in wave propagation.
  • Achieving time reversal of waves often requires complex active control mechanisms.

Purpose of the Study:

  • To introduce a counterintuitive method for achieving wave time reversal.
  • To explore the use of transitory dissipation pulses for wave manipulation.

Main Methods:

  • Theoretical concept of using a strong, localized damping pulse.
  • Implementation using phonon waves in a lattice of interacting magnets.
  • Validation through computer simulations.

Main Results:

  • A transitory dissipation pulse can generate a time-reversed wave.
  • High damping shocks effectively 'freeze' the wave, splitting it into counterpropagating components.
  • The method shows applicability to broadband time reversal in disordered systems.

Conclusions:

  • Time reversal of waves can be achieved passively via controlled dissipation.
  • This damping-based approach offers a new paradigm for wave control.
  • The findings have potential implications for wave manipulation in various physical systems.