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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
THEORETICAL MODELING OF A MECHANICAL NEAR-FIELD ACOUSTIC LEVITATION SYSTEM
Submission Author:
Arturo Burgos , MG
Co-Authors:
Arturo Burgos, Renata Rocha, Aldemir Ap Cavalini Jr, Aristeu Silveira Neto
Presenter: Arturo Burgos
doi://10.26678/ABCM.ENCIT2020.CIT20-0386
Abstract
The problem in question permeates the fluid induced acoustic levitation, which consists of the introduction of a large amount of pressure waves, resulting from the sound vibration of a high frequency exciter creating a pressure field from a compression film, as a consequence of an opposing force to gravity. It is possible for objects to be suspended, even if they are large or heavy. Understanding the behavior of this type of model is of paramount importance due to the numerous applications and its versatility. The approach used in the present work is new, as it seeks to describe the pressure field by means of a system of ordinary differential equations solved simultaneously using the method of progressive finite differences. The proposed model consists of a receiving disk and an exciting surface, where both are surrounded by a cylinder so that the system is sealed and that there is no mass flow. In addition, it is necessary to analyze the reliability of the proposed model. For this, at first, the problem is modeled, so that the exciter is static, that is, it is not active. Thus, the focus of the analysis is only on the receiver and its movement from rest. With this simplification, and the introduction of the parameter beta , which depends on the mass and cross-sectional area of the disk, it is possible to compare the numerical model with an analytically predicted response, which validates the hypothesis. Finally, the last case analyzed will be one with a movement imposed on the exciter with known speed, position and frequency and obviously the implications of this for the receiver and the system such as the variation of the specific mass of the film, the internal temperature and the position of the disc over time.
Keywords
acoustic levitation, numerical analisys, flow-induced vibration, near field, Theoretical Model
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