Acoustic Simulation
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. Acoustic Emissions from Wind Turbine Blades
ABSTRACT Research on broadband aerodynamic noise from wind turbine blades is becoming important in several countries. In this work, computer simulation of acoustic emissions from wind turbine blades are predicted using quasi empirical model for a three-bladed horizontal axis 3 MW turbine with blade length ~47 m. Sound power levels are investigated for source
J. Aerosp. Technol. Manag.. Publicado em: 10/10/2019
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2. Ultrasonic method of microvibration detection: part II - additional processing method and applications
Abstract Introduction In the last 28 years, the scientific community has been using elastography to evaluate the mechanical properties of biological tissue. The aim of this work was the optimization of the UDmV method, presented in Part I of the series, by means of modifying the technique employed to generate the reference sine and cosine functions, used fo
Res. Biomed. Eng.. Publicado em: 17/08/2017
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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. Realistic deformable 3D numeric phantom for transcutaneous ultrasound
Abstract Introduction Numerical phantoms are important tools to design, calibrate and evaluate several methods in various image-processing applications, such as echocardiography and mammography. We present a framework for creating ultrasound numerical deformable phantoms based on Finite Element Method (FEM), Linear Isomorphism and Field II. The proposed met
Res. Biomed. Eng.. Publicado em: 16/03/2017
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5. Finite element simulation of laser generated ultrasound waves in aluminum plates
The Laser-Ultrasonic technique uses laser energy to generate ultrasound waves in various solids. This technique allows inspecting large structures. The generated ultrasound wave form is affected by features of laser pulse (wavelength, pulse duration, power density). The goal of this paper is to study the effects of laser parameters (rise time and beam radius
Lat. Am. j. solids struct.. Publicado em: 2014
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6. Controle ativo acústico estrutural: projeto, simulação e análise de qualidade sonora / Active structural acoustic control: design, simulation and analysis of sound quality
This master thesis deals with the study of active noise and sound quality control systems in automotive applications, and the innovative assessment of their performance based on relevant psychoacoustic metrics in this area such as Loudness, Roughness and Tonality. A methodology for designing and implementing active control systems based on psychoacoustic met
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/08/2012
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7. Controle ativo de ruído aplicado a dutos com propagação de modos acústicos de alta ordem via particionamento axial / Active noise control applied to ducts with propagation of high- order acoustic modes via partitioning axial
O controle ativo de ruído (CAR) aplicado a dutos onde existe a propagação de ondas planas tem sido alvo de vários estudos. Aplica-se, nesses casos, o controle ativo monocanal. Nos dutos com grandes seções transversais, a propagação acústica se dá com a presença dos modos de alta ordem. Nesses dutos é necessário o controle multicanal, o que leva
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/03/2012
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8. 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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9. Coeficiente de espalhamento sonoro de painéis perfurados / Scattering sound coefficient of perforated panels
Project studios, concert halls, theaters or places that require quality acoustics for musical activities, require studies on its volume, shape and composition of their surfaces, in order to achieve a place that fulfills its function acoustics. In cases where the volume and shape of these rooms are already defined, it is the acoustic designer to define materi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2011
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10. Controle acústico híbrido da perda de transmissão sonora / Hybrid acustic control of sound transmission loss
The control of transmission loss through panels is a problem that has attracted the attention of automotive, aeronautical and aerospace industries. The passive noise control strategies used for this purposed does not have high efficiency in all audible spectrum, although it consists in a robust solution, it is not effective in low frequency absorb (below 1kH
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/07/2011
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11. Influência do espalhamento acústico na percepção auditiva de espaços : métodos e desenvolvimentos / Acoustic scattering coefficient influence in the spaces auditive perception : methods and developments
A ambientação acústica de salas é um tópico muito importante nos espaços contemporâneos, principalmente quando considerada a tendência de utilização para várias finalidades. A adaptação do ambiente de acordo com o uso em questão é realizada a partir da alteração do direcionamento da energia sonora dentro deste ambiente. Esta redistribuição
Publicado em: 2011
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12. Simulação de um arranjo esférico de alto-falantes usando um modelo de membrana flexível / Simulation of a spherical loudspeaker array using a flexible membrane model
Duas abordagens para a simulação do campo sonoro produzido por um arranjo esférico de alto-falantes são apresentadas e comparadas a resultados experimentais. Na primeira, modos estruturais obtidos da analise modal experimental da membrana são usados em simulações vibroacusticas por elementos de contorno no software LMS Virtual.Lab®. Na segunda, adota
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/08/2010