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Related Concept Videos

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
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Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
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Liquid crystal elastomer self-oscillator with embedded light source.

Yong Yu1, Fan Yang1, Yuntong Dai1

  • 1School of Civil Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China.

Physical Review. E
|December 20, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a self-oscillating spring oscillator using liquid crystal elastomer (LCE) fiber for autonomous periodic light switching. This simple, controller-free system offers new possibilities for soft robots and sensors.

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Area of Science:

  • Materials Science
  • Nonlinear Dynamics
  • Soft Robotics

Background:

  • Periodic light switching is crucial for various applications but typically requires complex controllers.
  • Liquid Crystal Elastomers (LCEs) are stimuli-responsive materials with potential for autonomous actuation.

Purpose of the Study:

  • To construct and investigate a self-oscillating spring oscillator using optically responsive LCE fiber.
  • To achieve autonomous periodic switching of an embedded light source without external controllers.

Main Methods:

  • Fabrication of a spring oscillator comprising an embedded light source and an LCE fiber.
  • Development of a nonlinear dynamic model based on established LCE dynamics.
  • Numerical simulations to analyze the system's dynamic behavior and regimes.

Main Results:

  • The spring oscillator exhibits two distinct motion regimes: self-oscillation and static.
  • Self-oscillation is sustained by the balance between light energy input and damping dissipation.
  • Critical conditions for self-oscillation and the influence of system parameters on frequency and amplitude were identified.

Conclusions:

  • A simple, controller-free self-oscillating system for periodic lighting was successfully demonstrated.
  • The LCE-based oscillator offers a novel design approach for soft robots and sensors.
  • This system provides a foundation for developing more diversified and autonomous soft electronic devices.