Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Particle Damping in Rotating Cantilever Beams
Submission Author:
Rodrigo Nicoletti , SP , Brazil
Co-Authors:
Rodrigo Nicoletti, Leonardo Oliveira
Presenter: Rodrigo Nicoletti
doi://10.26678/ABCM.COBEM2019.COB2019-2186
Abstract
Rotating blades can present catastrophic failure due to excessive blade vibration. One way of adding damping to a rotating blade, thus reducing vibration responses, is to adopt the so called particle dampers. Particle dampers are passive attenuating mechanisms of vibration, where small to medium sized particles are introduced into the structure to dissipate energy. In this work, the idea is to drill holes in the longitudinal direction of the turbine blades and fill them with particles to increase structure damping and reduce blade vibration responses. We adopt bigger particles (steel spheres of 5 mm diameter) and the spheres are not free to vibrate in the structure. Therefore, the particles will present no shock, but only friction as an energy dissipation mechanism. In addition, we include the effect of rotation to the blade, which will impose to the spheres an increasing normal force due to centrifugal effects. The results show the effectiveness of reducing resonance peaks in the frequency response function of the structure.
Keywords
Friction Damper, Particle systems, dynamic structure, Vibration Analysis, vibration supression
