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SUMMARY:Vibration Energy Harvesting Based on Internal Resonance - Prof. Li
 -Qun Chen\, Harbin Institute of Technology
DTSTART:20250131T160000Z
DTEND:20250131T170000Z
UID:TALK226123@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:Internal resonance is a typical nonlinear phenomenon associate
 d usually with double jumps\, two peaks bending to the left and the right 
 respectively in amplitude-frequency responses. The presentation begins wit
 h two cases in which 1:2 internal resonance results in the change of harde
 ning and softening characteristics in the amplitude-frequency responses. O
 ne case is a pipe conveying fluid flowing in the supercritical speed\, and
  the analysis is based on a discretized model. The other case is coupled c
 antilevers subjected to magnetic interaction\, and the analysis is based o
 n a distributed model. In both cases\, with the increase or the decrease o
 f a parameter\, multi-scale analysis reveals that double jumps evolve from
  a jump with softening characteristic and disappear as a jump with hardeni
 ng characteristic\, and the analytical outcomes are supported by numerical
  simulations. Double jumps with internal resonance may be a possible mecha
 nism to enhance energy harvesting by broadening the harvester working freq
 uency bands. An electromagnetic device with snap-through nonlinearity is p
 roposed as an archetype of an internal resonance energy harvester with dou
 ble jumps in the amplitude-frequency responses derived from the method of 
 multiple scales. To show the effectiveness\, the averaged root-mean-square
  output voltages are calculated under four kinds of noses\, namely\, the G
 aussian white noise\, the colored noise defined by a second-order filter\,
  the narrow-band noise\, and exponentially correlated noise. Finally\, an 
 L-shaped cantilevered structure laminated with a piezoelectric patch and a
 ugmented with frequency tuning magnets is treated analytically\, numerical
 ly and experimentally. All these works demonstrate that the internal reson
 ance increases the opening bandwidth and the output electricity.
LOCATION:JDB Seminar Room\, CUED
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