Acoustical Analysis
Mostrando 1-12 de 23 artigos, teses e dissertações.
-
1. 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
-
2. Study on effects of wood fiber content on physical, mechanical, and acoustical properties of wood-fiber-filled gypsum composites
The Acoustical model of wood-fiber-filled gypsum composites panel is presented. The transmission loss coefficients of the composite structures were calculated by an approximated approach. However, the physical and mechanical properties of board specimens including; water absorption, thickness swelling, bending modulus of elasticity, bending modulus of ruptur
Materials Research. Publicado em: 24/02/2012
-
3. Avaliação de duas ferramentas para a representação das variáveis acústicas implicadas no vibrato da flauta.
This work investigated the flute vibrato, to determine which analytical tools that represent it in a more comprehensive way. Our aim is to use these tools to improve flute instrumental technic. After considering previously published works on this topic, it has been decided to focus this investigation on the following vibrato acoustical parameters: extent, ra
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/08/2011
-
4. Estudo do ruído de rodagem estrutural através da análise dos caminhos de transferência de energia - TPA / Structure-borne road noise study using transfer path analysis, TPA
The road noise, vibration and harshness (Road NVH) present from 20 Hz to 1000 Hz approximately, begins from the tires vibration and acoustic propagation and their interactions with the road surfaces. In these noise sources, both structural-borne and air-borne noise contributions are relevant to vehicle refinement. The constant efforts to study the vehicle as
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2011
-
5. The use of Wavelet packet transform and artificial neural networks in analysis and classification of dysphonic voices
This paper presents a dysphonic voice classification system using the wavelet packet transform and the best basis algorithm (BBA) as dimensionality reductor and 06 artificial neural networks (ANN) acting as specialist systems. Each ANN was a 03-layer multilayer perceptron with 64 input nodes, 01 output node and in the intermediary layer the number of neurons
Publicado em: 2011
-
6. A Prosódia na expressão de atitudes na fala de indivíduos com e sem gagueira
A major function of prosody is the expression of attitudes, among them there is the certainty and doubt. Through modulation of parameters such as melodic variation and duration humans are able to transmit to others their communicative intention. However, speech disorders such as stuttering may have as one of its consequences, difficulties in prosodic organiz
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2010
-
7. Integrating production and perception of secundary prominences in a dynamical perspective of rhythm / Integrando produção e percepção de proeminencias secundarias numa abordagem dinamica do ritmo da fala
The thesis investigates two main subjects: secondary stress in Brazilian Portuguese (BP) and the link between rhythm production and rhythm perception. Both subject matters are developed in light of Barbosa s (2006, 2007) coupled-oscillator model of rhythm production. Interest in secondary stress in BP is fostered by the fact that its existence, nature and di
Publicado em: 2010
-
8. Intonational strategies in ensemble singing
The aim of the research was to find out about intonational strategies in the performance situation. The singing voice was chosen as the appropriate subject for experimental work, due to its superior capability to define pitch as compared to other musical instruments. Ensemble singing was also required, as harmonic context may be important in the clarificatio
Publicado em: 2009
-
9. AcMus: an open, integrated platform for room acoustics research
This article describes the design, implementation, and experiences with AcMus, an open and integrated software platform for room acoustics research, which comprises tools for measurement, analysis, and simulation of rooms for music listening and production. Through use of affordable hardware, such as laptops, consumer audio interfaces and microphones, the so
Journal of the Brazilian Computer Society. Publicado em: 2008-09
-
10. Desenvolvimento de análise por trajetórias vibroacústicas para aplicação automotiva
An analysis and development of how vibration and acoustic noise generated in a motor car arrives at the interior of the vehicle, a key issue in modern industry, is presented. The study considers the development of experimental techniques, employing computational data processing and data systemising, leading to the identification and ranking contribution of b
Publicado em: 2008
-
11. Design of sound diffusers by serial procedure : acoustical adequacy of small rooms to musical performance and listening / Design de difusores sonoros a partir de processo serial : adequação acustica de pequenas salas a performance e audição musical
This study is aimed at acoustic comfort solutions for music listening and performance by mainly considering psychoacoustic aspects related to subjective listening of musicians and specialists concerned with this field of knowledge. Starting from acoustic evaluation criteria of music rooms (opera houses and concert halls) in Beranek and principles of design a
Publicado em: 2008
-
12. Leak detection in pipelines through acoustic method and pressure transient analysis / Detecção de vazamentos em tubulações atraves de metodo acustico e da analise de transientes de pressão
Redes de tubulação são sistemas complexos de dutos utilizados no transporte de fluidos a longas distâncias. Um pequeno vazamento em uma tubulação pode provocar grandes perdas de produtos e sérios danos ao meio ambiente até serem detectados. Com o propósito de prevenir vazamentos em tubulações, várias técnicas são relatadas na literatura. Este t
Publicado em: 2007