Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
INTERVAL UNCERTAINTY AND SENSITIVITY ANALYSES DEDICATED TO THE NEAR-FIELD ACOUSTIC LEVITATION FORCE
Submission Author:
Geisa Zuffi , MG
Co-Authors:
Geisa Zuffi, Fabian Andres Lara-Molina, Fran Lobato, Aldemir Ap Cavalini Jr, Valder Steffen Jr
Presenter: Aldemir Ap Cavalini Jr
doi://10.26678/ABCM.COBEM2019.COB2019-0684
Abstract
This work aims to analyze the effect of uncertain parameters on the levitation force obtained using a mechanical system subjected to the phenomenon of near-field acoustic levitation. The system consists of two discs, namely the driving surface and the object to be levitated. In this case, the object to be levitated is fixed, that is, the gap between the discs varies only according to the vibration amplitude of the driving surface. The pressure distribution generated between the discs is described by the Reynolds equation. The uncertainties are introduced as variations in the environmental conditions and in the actuation system operational parameters. Thus, the atmospheric pressure, fluid viscosity, initial height of the object to be levitated, amplitude of vibration of the driving surface, operational frequency, and the size of both discs are considered as uncertain information. In the present contribution, the levitation force was obtained from the solution of the Reynolds equation associated with the so-called interval uncertainty method. A sensitivity analysis was also performed to determine the uncertain parameters which most affects the levitation capability of the levitation system.
Keywords
Near-field acoustic levitation, Reynolds equation, interval uncertainties, force capacity
