Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Optimum Design of a set of Dynamic Neutralizers to Passive Vibration Control Considering Physical Parameters, Location and Viscoelastic Material Variable
Submission Author:
Francielly Silva , PR , Brazil
Co-Authors:
Carlos Alberto Bavastri, Francielly Silva
Presenter: Francielly Silva
doi://10.26678/ABCM.COBEM2017.COB17-1206
Abstract
Structures exposed to high level of vibrations produced by resonance or dynamic instability can fail or have, in general, their lifetime reduced. In some cases, the unwanted noise level affects the operation for which the equipment or structure was designed. In these cases, a feasible solution to reduce vibration levels and/or irradiated noise is to use viscoelastic dynamic neutralizers (VDNs). These devices have been used with considerable success in vibration control, due the high capability of viscoelastic materials to dissipate large vibration energy. The vibration and sound group (GVIBS) has a methodology that takes into account the natural frequency and the optimal position of one degree-of-freedom VDNs, in a broadband of frequency. In this context, the present study aims to develop a methodology for optimal design of neutralizers considering also, among other design variables, the viscoelastic material. The optimal configuration is obtained by the application of a hybrid optimization technique which uses Genetic Algorithms and, a nonlinear programming method to perform a local search. To evaluate the proposed methodology, simulations were performed on a metallic plate where one or more neutralizers are considered. A new proposal to calculate the VDNs mass, allows obtaining different values for different VDNs to control one or more modes, which turns vibration attenuation more efficient. The results of the optimal design of VDNs, for a given temperature, proves to be promising, and the inclusion of the viscoelastic material in the optimization process, proves to be an interesting aspect in vibration control.
Keywords
Passive Vibration Control, Dynamic neutralizers, Viscoelastic material, Optimization
