Low-Frequency Broadband Vibration Damping Using the Nonlinear Damper with Metamaterial Properties
* Presenting author
Abstract:
Particle dampers are structural vibration treating options that have been used in applications for more than the last decade. Kinetic energy and momentum changes in the contact interactions are the main reasons for energy dissipation. Effectivity of the particle dampers depends on many parameters; the frequency range and amplitude of the excitation are examples of these parameters, making the particle damping application nonlinear. This research is based on the particle damping application within an array using metamaterial properties to broaden the low-frequency range vibration dissipation. In this case, metamaterials are subwavelength structures that offer superior vibro-acoustic properties. The enclosure cavity of the particle dampers is designed to illustrate local resonance properties within the selected mode frequencies of the main structure that is under excitation impact. Equivalent structure continuum modelling of the particle dampers has been accomplished through DEM and the analytical methodology using granular structure contact properties. The metamaterial unit cell modelling is based on the Bloch-Floquet Theory using FEM. Also, the finite structure modelling of the nonlinear damper with metamaterial application is modelled in FEM. Annotations related to the nonlinearity of the particle dampers and vibro-acoustic dispersion relations in metamaterial application are shown in the paper using experimental validations.