Excellence in Research and Innovation for Humanity
@article{(International Science Index):http://waset.org/abstracts/82596,
  author    = {Diala Bitar and  Emmanuel Gourdon and  Claude H.  Lamarque and  Manuel Collet},
  country   = {France},
  title     = {Nonlinear Passive Shunt for Electroacoustic Absorbers Using Nonlinear Energy Sink},
  abstract  = {Acoustic absorber devices play an important role reducing the noise at the propagation and reception paths. An electroacoustic absorber consists of a loudspeaker coupled to an electric shunt circuit, where the membrane is playing the role of an absorber/reflector of sound. Although the use of linear shunt resistors at the transducer terminals, has shown to improve the performances of the dynamical absorbers, it is nearly efficient in a narrow frequency band. Therefore, and since nonlinear phenomena are promising for their ability to absorb the vibrations and sound on a larger frequency range, we propose to couple a nonlinear electric shunt circuit at the loudspeaker terminals. Then, the equivalent model can be described by a 2 degrees of freedom system, consisting of a primary linear oscillator describing the dynamics of the loudspeaker membrane, linearly coupled to a cubic nonlinear energy sink (NES). The system is analytically treated for the case of 1:1 resonance, using an invariant manifold approach at different time scales. The proposed methodology enables us to detect the equilibrium points and fold singularities at the first slow time scales, providing a predictive tool to design the nonlinear circuit shunt during the energy exchange process. The preliminary results are promising; a significant improvement of acoustic absorption performances are obtained.},
  keywords  = {electroacoustic absorber, multiple-time-scale with small finite parameter, nonlinear energy sink, nonlinear passive shunt},
  volume    = {12},
  number    = {4},
  year      = {2018},
  pages     = {1114},
  ee        = {http://waset.org/abstracts/82596},
  url       = {http://waset.org/abstracts/Aerospace-and-Mechanical-Engineering},
  bibsource = {http://waset.org/abstracts},
  conference = {ICSV 2018: International Conference on Sound and Vibration, Boston, USA, (Apr 23-24,  2018)},
  issn      = {eISSN:1307-6892},
  publisher = {World Academy of Science, Engineering and Technology},
  index     = {International Science Index, Aerospace and Mechanical Engineering,  11(4) 2018},
}