Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Multimodal vibration control using dynamic neutralizers in rotating machines
Submission Author:
Danielle Raphaela Voltolini , SC , Brazil
Co-Authors:
Samuel Cavalli Kluthcovsky, Eduardo Márcio de Oliveira Lopes, Carlos Alberto Bavastri, Danielle Raphaela Voltolini
Presenter: Danielle Raphaela Voltolini
doi://10.26678/ABCM.COBEM2017.COB17-0740
Abstract
Rotating machines often work close to or even above their critical speeds, becoming susceptible to resonance or dynamic instability. These phenomena may cause high vibration levels, particularly when rolling bearings are used. Viscoelastic dynamic vibration neutralizers (VDVNs) are relatively cheap passive devices with a wide range of applications, including the vibrations control of rotating systems. These devices can be designed according to specific needs for controlling flexural vibration in dynamic rotors, and the point where the device is attached depends, in some cases, on the mode to be controlled. In electrical motors and generators, for example, with reduced internal space, the position to attach it is an important variable. The current paper focuses on the angular VDVN for shaft slope degree of freedom (DOF) control acting indirectly by reducing multimodal flexural vibrations. The angular VDVN can be installed close to the bearing where the slope DOF presents its highest value at any critical speed and where there is no lack of space. The conceptual design of the angular VDVN is shown to illustrate the proposed methodology, and a numerical example is given to demonstrate the influence of the angular VDVN on the response around the first two critical speeds.
Keywords
Angular vibration neutralizer, Flexural vibration control, Multimodal control, Rotordynamics, Viscoelastic material
