Eventos Anais de eventos
CONEM 2022
XI Congresso Nacional de Engenharia Mecânica - CONEM 2022
Design of a new Multimodal Passive Dynamic Vibration Absorber
Submission Author:
Julio Caldo Brotto , SP
Co-Authors:
Julio Caldo Brotto, Sebastião Simoes Cunha Jr, João Luiz Junho Pereira, Marc Moonens
Presenter: João Luiz Junho Pereira
doi://10.26678/ABCM.CONEM2022.CON22-0253
Abstract
The main purpose of this work is the design of a new model of a Multimodal Passive Dynamic Vibration Absorber (MMPDVA). In this way, through dynamic analysis, using Finite Element Method (FEM), the parameters of mass and stiffness of the ADVPMM are obtained so that it can absorb vibrations in different frequency bands simultaneously, and can be applied in different type of mechanical systems. Here, the MMPDVA was coupled to a cantilevered beam. In the methodology used, the MMPDVA is parameterized through an FEM model and a global optimization procedure is used in order to find the new parameters of the MMPDVA that will make it able to attenuate vibrations in different frequency bands simultaneously. In the first step, an initial MMPDVA was modeled, which had only two initial design parameters, and a modeling code was created, which was used to obtain the modal and harmonic analysis data from the initial model of the absorber system. Once the data from the initial MMPDVA model was obtained, a new MMPDVA was designed, however, with new design parameters (7 parameters) that will be used as design variables in the optimization procedure in order to design the MMPDVA. We used a global optimization heuristic called Lichtenberg Algorithm (LA), developed by authors, in order to obtain the new parameters of the MMPDVA so that its natural frequencies are very close to the selected frequencies of the cantilevered beam, thus being able to attenuate vibrations in different frequency bands simultaneously. For the first approach, 3 vibration modes of the primary structure had the vibrations level attenuated. The final MMPDVA model presents an easy-to-build geometry, which can be applied to different mechanical structures.
Keywords
Vibrations, Multimodal Passive Dynamic Vibration Absorber, Lichtenberg Algorithm, Anti-resonance
