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DINAME2019
DINAME2019
Cubic Stiffness on the Subunits of a Periodic Structure for Suppres- sion of Axial Vibration
Submission Author:
Diego Pereira Vasconcellos , SP , Brazil
Co-Authors:
Diego Pereira Vasconcellos, Marcos Silveira
Presenter: Diego Pereira Vasconcellos
doi://10.26678/ABCM.DINAME2019.DIN2019-0126
Abstract
Periodic structures, also known as metastructures, have vibration suppression characteristics that are not found nor common in natural materials. these characteristics are not in the chemical form of the material, but in the arrangement of the structure, that is, they are materials that can be created by manipulating physical characteristics. The study of metamaterials began with electromagnetic metamaterials. Subsequently, the study of metamaterials is extended to the field of acoustics and vibration, and for that it is necessary to implement the concept of negative mass. It is implemented through the addition of local absorbers. There are several periodic systems that can be applied in everyday life, and can be seen as finite or cyclic periodic structures. Periodic structures can be used in several areas, as they can reduce vibration without having to add mass to the system, just by moving the arrangement of the structure. A major advantage of periodic structures is that it is possible to analyze the structure dynamics by taking data from only one cell. In this paper, we compare the response of a metastructure with different combinations in the positioning and nature of restoring force (linear or nonlinear) of absorbers along the structure. The response is verified at the first mass of the structure, while a periodic excitation is applied at the last mass. And you can see in the results that, in general, for both the linear system and the nonlinear system, the variable that will most impact the choice of the absorber positioning if a lower amplitude of vibration is desired will be the excitation frequency at which the system will be subjected.
Keywords
Metastructure, Periodic structure, Nonlinear stiffness
