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A nonlinear double-winged adaptive neutralizer for optimum structural vibration suppression

Jalili, N ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. DOI: 10.1016/S1007-5704(02)00081-3
  3. Publisher: 2003
  4. Abstract:
  5. A distributed, nonlinear dynamic vibration neutralizer is presented to improve vibration suppression characteristics of harmonically excited structures. The absorber subsection consists of a double-ended cantilever beam carrying intermediate lumped masses. The positions of the moving masses are adjustable along the beam in order to comply with the desired optimal performance. The absorber is assumed to be linearly elastic but with the inextensibility along the neutral axis of the beam. Due to the existence of parametric resonance, nonlinearities of the system begin to affect the motion and hence parametric instability occurs. The necessary and sufficient conditions for the existence of periodic oscillatory behavior along with some physical bounds placed on the absorber parameters form a constrained optimization problem for the optimum tuning strategy. Numerical simulations show that adaptive tuning can be achieved by variation of the tuning mass locations such that the first mode natural frequency is modulated on-line. The optimally tuned neutralizer provides considerable vibration suppression improvements over both the passive and de-tuned absorbers. © 2003 Elsevier Science B.V. All rights reserved
  6. Keywords:
  7. Nonlinear vibration neutralizer ; Parametric resonance ; Stability and periodicity analyses ; System nonlinearities
  8. Source: Communications in Nonlinear Science and Numerical Simulation ; Volume 8, Issue 2 , 2003 , Pages 113-134 ; 10075704 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1007570402000813