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DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
A NUMERICAL METHODOLOGY FOR DESIGNING A VISCOELASTIC VIBRATION NEUTRALIZER WITH TUBULAR GEOMETRY AND CONSTRAINED LAYERS
Submission Author:
Igor Fernando Rodrigues , PR , Brazil
Co-Authors:
Igor Fernando Rodrigues, Eduardo Márcio de Oliveira Lopes, Jucélio Tomás Pereira
Presenter: Eduardo Márcio de Oliveira Lopes
doi://10.26678/ABCM.DINAME2017.DIN17-0196
Abstract
Vibration neutralizers (also called vibration absorbers) have been widely used in passive vibration control due to its practicality and efficacy. One way of introducing damping into these devices and thus enlarging their range of action is by inserting viscoelastic materials in a constrained layer form. However, for flat geometries, among others, vibration control depends on the excitation direction. This leads to the consideration of alternative geometries with a multidirectional energy dissipation character. This paper presents a numerical study in which the efficacy of a viscoelastic vibration neutralizer with tubular geometry and constrained layers is investigated. The neutralizer optimum parameters are found by employing a discrete model, developed via the finite element method, along with response reanalysis and optimization techniques, apart from the response surface strategy. In this process, the viscoelastic material is described by a fractional derivative constitutive model. The methodology is designed to work with the frequency response curves of the primary and secondary systems (namely, the system to be controlled and the neutralizer), which makes it possible to exclude the primary system model from the optimization process. For existing systems, those curves can be obtained experimentally. The corresponding plots show that the resulting neutralizer has a distinct and multidirectional action over the frequency band of interest.
Keywords
Passive Vibration Control, Viscoelastic vibration neutralizer, Tubular constrained viscoelastic layer, Finite Element Method, Response reanalysis
