Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Evaluation of established and novel methods used in complex vibro-acoustics analysis
Submission Author:
Thiago Morhy , SC
Co-Authors:
Thiago Morhy, Mathias Hinz, Julio Cordioli
Presenter: Thiago Morhy
doi://10.26678/ABCM.COBEM2021.COB2021-0989
Abstract
Complex vibro-acoustic systems contemplate most of the engineering designs in several important industrial and technological areas of production and transportation at present days, and certainly will be on future activities permeating society. Such systems are composed of diverse physical components with different degrees of dynamic complexity and irregular geometries. To understand and control the noise and vibration from these complex systems, multiple analytical and numerical frameworks were developed to model and analyze them. This paper presents an overview with comparisons and evaluations for some of these established modelling procedures and increments the discussion with a novel fully numerical framework for complex vibro-acoustic system analysis. The established frameworks and methods presented are: Finite Element Method (FEM), which is the main reference result of the paper, Statistical Energy Analysis (SEA) for high frequency motion analysis and the Hybrid FE-SEA Method for "mid frequency" interactions. The novel framework is a more general definition to the Hybrid FE-SEA Method, using fully numerical descriptions to model the statistical subsystems. These descriptions are extracted from averaging techniques applied to standard FE models of the subsystems. The methods and frameworks were evaluated on numerical examples, in which each case highlighted specific features or limitations from the analytical and numerical formulations used by the modeling procedures. A FE Monte Carlo approach was used to represent FEM solutions. Results exhibited their distinct computational processing costs, amount of detail considered on solutions and reliability on the system description. The fully numerical framework was evaluated in a Numerical SEA context, where every subsystem is modeled statistically, and showed promising results and robust descriptions for the selected numerical examples in comparison to the established vibro-acoustic modeling procedures. The novel framework also demonstrated to be a strong competitor to SEA regarding modeling systems with irregular geometry. where SEA usually fails to obtain a reliable input power description.
Keywords
Finite Element Method, Statistical Energy Analysis, Hybrid FE-SEA Method, Numerical SEA, Complex Vibro-acoustic Systems
