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Vibration Reduction Using a Nonlinear Attachment Including an Active Damper With Delay

[+] Author Affiliations
Sergio Bellizzi

LMA, CNRS, Marseille Cedex, France

Kwok W. Chung

City University of Hong Kong, Hong Kong, Hong Kong

Paper No. IMECE2015-50967, pp. V04BT04A055; 10 pages
doi:10.1115/IMECE2015-50967
From:
  • ASME 2015 International Mechanical Engineering Congress and Exposition
  • Volume 4B: Dynamics, Vibration, and Control
  • Houston, Texas, USA, November 13–19, 2015
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5740-3
  • Copyright © 2015 by ASME

abstract

This paper presents the interest of a nonlinear passive absorber coupled to a semi-active damper with delay for vibration isolation of harmonic disturbances. The passive absorber consists of an essentially nonlinear oscillator (nonlinear energy sink [NES]), having the task to transfer the energy from the main structure to the semi-active device. The semi-active device consists of an active viscous damper with semi-active strategy control including delay. A theoretical/numerical analysis based on complexification and averaging methods together with multipe scale method is performed. It is shown that the approach is able to predict the behaviour of the system including time delay. The influence of the time delay on the efficiency of semi-active nonlinear absorber is studied. It is shown that time-delay could be used as a design parameter to improve the control of the vibration of the primary system suppressing strongly modulated regimes through periodic regimes.

Copyright © 2015 by ASME
Topics: Dampers , Vibration , Delays

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