Eventos Anais de eventos
DINAME 2023
XIX International Symposium on Dynamic Problems of Mechanics
General power-flow method for vibro-acoustic mid-frequency problems
Submission Author:
Thiago Morhy , SC
Co-Authors:
Thiago Morhy, Julio Cordioli
Presenter: Thiago Morhy
doi://10.26678/ABCM.DINAME2023.DIN2023-0140
Abstract
Most of the main production and transportation industries work with complex systems that present important vibro-acoustic mechanics, such as automotive vehicles, airplanes, marine and trains. Generally, these systems are composed by a set of distinct coupled components, e.g., pillar/column connected to a flexible plate or an acoustic cavity. At a specific frequency range of interest, these components vibrate in very distinct wavelengths simultaneously, resulting in a scenario denoted as mid-frequency problem. One of the methods used to simulate such systems is the Hybrid FE-SEA Method, which couples the Finite Element (FE) Method and Statistical Energy Analysis (SEA) by means of a robust formulation. The method has been used for more than a decade since developed and presents superior performance, when compared to other approaches in this scenario. There is, however, a limitation in the method to components vibrating in small wavelengths (SEA subsystems): their vibrational response needs to be approximated from elementary structural components, resulting in less robust results for irregular component configurations. In this sense, a novel method has been proposed, allowing for irregular configurations to be fully described in a power-flow framework. The method has been denoted Generalized Hybrid FE-SEAS, but it has been evaluated only for high-frequency problems and has yet to be applied to mid-frequency problems. The main aim of the present work is to evaluate the Generalized Hybrid FE-SEA. In this sense, the formulation will be reviewed and the method will be applied to two numerical cases. The results obtained show that the novel method is capable of deriving superior results to the established Hybrid FE-SEA when compared to a reference Monte Carlo simulation.
Keywords
Vibro-acoustics, Mid-frequency problems, Hybrid FE-SEA, Statistical Energy Analysis, Finite Element Method
