Vibratory control of a linear system by addition of a chain of nonlinear oscillators

Simon Charlemagne (1) , Claude-Henri Lamarque (1) , Alireza Ture Savadkoohi (1)

1 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes

A N-degree-of-freedom model consisting of a single-degree-of-freedom linear system coupled to a chain of (N − 1) light nonlinear oscillators is studied. The connection between the chain and the single-degree-of-freedom system is supposed to be linear. Time multi-scale system behaviors at fast and slow time scales are investigated and lead to detection of the Slow Invariant Manifold (SIM) and equilibrium and singular points. These points correspond to periodic regimes and strongly modulated responses, respectively. These analytical developments are used to provide evidence of transfer of vibratory energy of the main system to the chain in the form of localized modes during periodic regimes and extreme energy exchanges between modes when the overall structure faces singularities. Furthermore, analytical predictions at slow time scale and nonlinear normal modes of the system are compared with numerical results obtained from direct time integration of system equations, showing a good agreement between them. Finally, we present a procedure showing how these analytical developments can be used to study a system where the main structure is replaced by a multi-degree-of-freedom linear system, by projecting its dynamics on one of its modes.

Mots clés: Localization; Nonlinear modes; Nonlinear chain; Vibratory energy; Time multi-scales method; Passive control

Domaines: Sciences de l'ingénieur [physics]; Physique [physics]; Science non linéaire [physics]

Simon Charlemagne, Claude-Henri Lamarque, Alireza Ture Savadkoohi. Vibratory control of a linear system by addition of a chain of nonlinear oscillators. Acta Mechanica, 2017, 228, pp.3111-3133. ⟨10.1007/s00707-017-1867-7⟩. ⟨hal-01517957⟩