Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
COMPARATIVE ANALYSIS OF THE PERFORMANCE OF TMD AND KDAMPER VIBRATION ATTENUATORS
Submission Author:
José Picoral , RS
Co-Authors:
José Picoral, Gibran Gomes, Herbert Gomes, ewerton grotti, Leonardo Roso Colpo
Presenter: Herbert Gomes
doi://10.26678/ABCM.COBEM2023.COB2023-0212
Abstract
Mechanical structures in general are commonly exposed to dynamic loads. The action of such loads, recurrently, can promote unwanted occupational effects in users and operators of industrial equipment and means of transportation, as well as in certain circumstances, can cause catastrophic structural failures. Currently, there has been an intensification of technical and scientific studies that aim to implement attenuators for dynamic loads, which are generally classified into active and passive attenuators, according to the use or not of external energy, respectively, for their operation. The scope and general objective of the respective work is the comparative analysis of the vibration attenuation levels that two different systems, TMD (Tunned Mass Damper) and KDamper, provide in the structures to which they are coupled. TMD systems are used repeatedly to attenuate vibrations in civil and mechanical structures, as well as targets for parametric optimization studies, where the best sets of stiffnesses and dampings are sought to minimize dynamic responses. Damping systems of the KDamper type however, have been relatively little explored compared to conventional damping systems, such as Tunned Mass Dampers. The use of a negative stiffness elastic element in the KDamper allows the inertial components used to attenuate the dynamic responses to reach higher kinetic energies than those that would be reached in TMD systems. Thus, providing greater dissipation of mechanical energies from vibrations and consequently greater attenuation of dynamic loads. The specific objectives of this work is the presentation of the main advantages and disadvantages of vibration attenuation systems, TMD and KDamper, by means of graphs and numerical comparisons, transfer functions and dynamic responses obtained through computational modeling. To evaluate the damping levels provided, both systems were coupled to a mechanical system and subjected to dynamic loads, and their performances were compared. By the analysis of the dynamic response, it was concluded that the KDamper presented a performance notably superior to the TMD, having reduced the rms acceleration compared to the value obtained for the structure without any vibration absorber. Thus, the study presented evidence of the good behavior of the KDamper compared to the TMD even in a wide band around the resonance frequency used for the design of vibration absorber and in the case of a simple structure due to its intrinsic negative stiffness feature.
Keywords
KDamper, TMD, Passive Vibration Attenuation, Negative Stiffness
