Wavelets Transforms
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Matrix Damage Detection in Laminated Composite Structures by Discrete and Continuous Wavelet Transforms Using Vibration Modes
ABSTRACT: In this paper it was sought to enhance the potential damage detection, location and quantification of the Discrete and Continuous Wavelet Transforms in thin damaged laminated composite plates by a signal derived from vibration modes. To evaluate the ability of both transforms in the damage prognostic it was also proposed the use of Damage Indexes.
J. Aerosp. Technol. Manag.. Publicado em: 21/09/2017
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2. Damage identification from uniform load surface using continuous and stationary wavelet transforms
Derived from flexibility matrix, Uniform Load Surface (ULS) is used to identify damages in beam-type structures. This method is beneficial in terms of more participating the lower order modes and having less prone to noise and irregularities in the measured data in comparison with the original flexibility matrix technique. Therefore, these characteristics ma
Lat. Am. j. solids struct.. Publicado em: 2014-10
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3. Cutting force response in milling of Inconel: analysis by wavelet and Hilbert-Huang Transforms
We study the milling process of Inconel. By continuously increasing the cutting depth we follow the system response and appearance of oscillations of larger amplitude. The cutting force amplitude and frequency analysis has been done by means of wavelets and Hilbert-Huang transform. We report that in our system the force oscillations are closely related to th
Lat. Am. j. solids struct.. Publicado em: 2013-01
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4. Detecção e classificação de arritmias em eletrocardiogramas usando transformadas wavelets, máquinas de vetores de suporte e rede Bayesiana
The cardiopathies are currently, according the Ministério da Saúde, the second biggest cause of mortality among the Brazilians, behind only the brain vascular diseases. The motivation for the work here presented is the identification and classification of cardiopathies registered in Electrocardiogram exams, ECG, such as premature contractions, branches blo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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5. Avaliação do desempenho de transformadas sobrepostas nos codificadores padrão JPEG2000 E H.264/AVC
This work aims to evaluate the performance presented by lapped transforms, wavelets and DCT in standards JPEG2000 and H.264/AVC coders. Even though there is much of information about the comparison of those transforms in many coders, there is little information available in literature relative to the performs of the performs of these transforms in the coders
Publicado em: 2008
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6. Sistemas inteligentes e wavelets para previsÃo de vento e geraÃÃo eÃlica / Intelligent systems and wavelets for forecast winds and wind energy
VÃrios estudos jà comprovaram que o potencial eÃlico brasileiro, principalmente no nordeste, onde os ventos tÃm uma importante caracterÃstica de complementaridade em relaÃÃo Ãs vazÃes do rio SÃo Francisco, pode contribuir significativamente para o suprimento de energia elÃtrica. O aproveitamento deste potencial eÃlico aumentaria a capacidade de g
Publicado em: 2008
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7. COMFALA : modelo computacional do processo de compreensão da fala
Esta Tese apresenta a investigação de técnicas computacionais que permitam a simulação computacional da compreensão de frases faladas. Esta investigação é baseada em estudos neurocognitivos que descrevem o processamento do cérebro ao interpretar a audição de frases. A partir destes estudos, realiza-se a proposição do COMFALA, um modelo computac
Publicado em: 2007
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8. Projeto de novos sistemas-wavelet com aplicaÃÃes na anÃlise de sinais do sistema elÃtrico / Design of new wavelet systems with applications in power system signal analysis
The wavelet transform equipped with the multiresolution analysis has been offered as an efficient tool in the investigation of non stationary signals derived from a plenty of areas. The development of new âbasisâ so as to implement such techniques has the aim of enlarging the span of suitable choices for a particular purpose. This thesis introduces new fam
Publicado em: 2006
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9. The utilization of Wavelets transforms in the extraction of characteristics and patterns recognition in ECG signals / Utilização das transformadas Wavelets na extração de características e no reconhecimento de padrão em um sinal de ECG
Presently doctors and medical professionals are having the aid of support systems for diagnosis which include in their data base expertise knowledge, acquired mainly through empirical observation of heuristics applied to their diagnosis which translate partially, to the technical application used. In the systems which aid diagnosis, more specifically in elec
Publicado em: 2006
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10. AproximaÃÃo espectral e construÃÃo de wavelets com aplicaÃÃes em eletrogastrografia / Spectrum approximation and wavelet design with applications in electrogastrography
Signal analysis is one of the most important areas of Signal Processing. This thesis is divided in three parts, each one addressing a specific topic of signal analysis. The sub-areas were: (i) approximate methods for spectrum evaluation; (ii) wavelet design; and (iii) biomedical signal analysis. The problem of spectrum estimation under constraints of minimal
Publicado em: 2005
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11. SUPRESSION GROUND ROLL BY EMPLOYING WAVALET / SUPRESSÃO DE RUÍDO DE ROLAMENTO SUPERFICIAL UTILIZANDO WAVELETS
Surface waves are a common source of unwanted noise in the seismic record. Ground roll can be defined as a group of events that contaminates seismic data and makes a high dip (low velocity) and high amplitude cone, this can dominate near-source on seismic records. Surface waves are such a problem in land seismic record acquisition that the design of acquisit
Publicado em: 1999