Vibroacoustic
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate
Abstract This paper applies acoustic analysis of Sound Transmission Loss (STL) through infinite Functionally Graded (FG) thick plate employing Hyperbolic Shear Deformation Theory (HSDT). The procedure for applying a FG plate is followed by considering the material properties are changed continually based on power-law distribution of the materials in terms of
Lat. Am. j. solids struct.. Publicado em: 04/02/2019
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2. Wave transmission across laminated composite plate in the subsonic flow Investigating Two-variable Refined Plate Theory
Abstract The main aim of this paper is to employ an extension of two-variable Refined Plate Theory (RPT2) to determine Sound Transmission Loss (STL) across laminated composite plate in contrast to external excitation. It should be noted that RPT2 known as a second type of Refined Plate Theory which includes the extension term in displacement field. To achie
Lat. Am. j. solids struct.. Publicado em: 14/06/2018
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3. Numerical Study of Vibro-Acoustic Responses of Un-Baffled Multi-Layered Composite Structure under Various End Conditions and Experimental Validation
Abstract This article presents the vibro-acoustic modeling and analysis of un-baffled laminated composite flat panels subjected to harmonic point load under various support conditions. The frequency values of the panel are obtained by using simulation model through the commercial finite element package (ANSYS) via batch input technique. Initially, the rate o
Lat. Am. j. solids struct.. Publicado em: 2017-08
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4. Deterministic, Hybrid and Statistical Vibro-Acoustic Models - a Methodology to Determine the VLS Payload Fairing Acoustic Behavior
ABSTRACT: Finite element method (FEM) and boundary element method (BEM) are methods usually applied on low-frequency coupled fluid-structure analysis. On the other hand, statistical energy analysis (SEA) is a technique applied on small wavelength bandwidth predictions. However, in the mid-frequency, where deterministic calculations are costly and confidence
J. Aerosp. Technol. Manag.. Publicado em: 2015-03
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5. Implementation of acoustic materials to the VLS-1 Fairing - a sensitivity analysis using SEA
Satellite launchers are submitted to severe acoustic loads mainly during lift-off where SPL achieve, at the upper parts, values within the range of 140-160 dB. Such an excitation can damage embedded elements, if energy attenuation measures are not adopted. In view of managing the PLF vibro-acoustic environment, numerical techniques are applied to predict ela
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
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6. Loudness scattering due to vibro-acoustic model variability
The use of numerical simulation in the design and evaluation of products performance is ever increasing. To a greater extent, such estimates are needed in a early design stage, when physical prototypes are not available. When dealing with vibro-acoustic models, known to be computationally expensive, a question remains, which is related to the accuracy of suc
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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7. A vibroacoustic application of modeling and control of linear parameter-varying systems
This paper applies recent advances in both modeling and control of Linear Parameter-Varying (LPV) systems to a vibroacoustic setup whose dynamics is highly sensitive to variations in the temperature. Based on experimental data, an LPV model is derived for this system using the State-space Model Interpolation of Local Estimates (SMILE) technique. This modelin
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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8. Uma proposta de ferramenta para controle de qualidade em linha de produÃÃo e montagem de cÃmbios automotivos utilizando filtragem adaptativa / A proposal of tool for automotive gearbox quality control in production and assembly line using adaptive filtering
Normally, automotive gearbox quality control in assembly line is made in subjective manner by specialists. The human ear, despite being a highly sensitive tool and widely used in quality control is also sensitive to emotional and environmental problems (back noises), besides not giving measurable values. In order to solve this problem, the traditional techni
Publicado em: 2007
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9. Supersonic acoustic intensity : implementation and evaluation / Intensidade acustica supersonica : implementação e verificação
This work presents an experimental implementation and evaluation of the acoustic parameter named Supersonic Acoustic Intensity (SAI) which permits determining the part of the acoustic intensity of sound source that will be radiate to farfield. This parameter permits quantify precisely the radiation efficiency or acoustic radiator to solve the vibroacoustic p
Publicado em: 2006
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10. Comparação de tecnicas de analise de caminhos de transferencia vibroacusticos / Comparison of techniques for vibro-acoustic transfer path analysis
Neste trabalho é feita uma comparação de técnicas analíticas e experimentais de Análise de Caminhos de Transferência Vibroacústicos. A Análise de Caminhos de Transferência, ou TPA como é conhecida pela abreviatura em inglês, é uma ferramenta para se avaliar a contribuição de diferentes caminhos de propagação de energia vibroacústica entre u
Publicado em: 2006
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11. Controle de vibração em reatores elétricos através de absorvedores dinâmicos viscoelásticos / Vibration control in electric reactors through dynamic viscoelastics absorbers
Reatores elétricos utilizados em subestações de energia têm funções específicas na operacionalização e manutenção da funcionalidade destas instalações, sendo equipamentos aplicados ao controle de reativos, de correntes de curto circuito e surtos de manobra em sistemas de transmissão de energia elétrica. Detectou-se que alguns reatores em funci
Publicado em: 2006
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12. Vibroacoustic vharacterization using nearfield acoustic holography / Caracterização vibroacustica usando holografia acustica de campo proximo
In this work, the Nearfield Acoustic Holography technique - NAH was explored as an way to analyze vibroacoustic problems. Holography is a process that allows to determine acoustic fields characteristics using a Discrete Fourier Transform - DFT, from a regular grid of measurements obtained in an acoustic environment for which the Green s function is known. Th
Publicado em: 1999