6 CONCLUSÕES FINAIS
6.1 Trabalhos futuros
Como sugestões de trabalhos futuros, propõem-se:
• Avaliação da sensitividade dos parâmetros dos quantificadores como por exemplo: tipo da wavelet mãe, número de níveis da WPT, número da “palavra” do método de BP, número de IMFs e aperfeiçoamento (matemático e computacional) dos métodos ora propostos;
• Comparação dos métodos ora propostos com técnicas padrão do domínio tempo- frequência como, por exemplo: espectro FFT, espectro do envelope, cepstrum, wavelet, EMD, EEMD, análise cicloestacionária, entre outras;
• Avaliação do desempenho da ferramenta em outros tipos de dados, para além dos dados de vibração, oriundos da O&M de turbinas eólicas como dados do sistema SCADA, dados anemométricos, dados de sistemas LIDAR/SODAR, dados de outros sistemas de CMS como análise do óleo, termografia;
• Validação da ferramenta em uma bancada onde todos os parâmetros estejam controlados e se possa saber o momento da falha e sua respectiva causa.
6.2 Artigos publicados
Ao longo desse trabalho foram publicados artigos em periódicos e congressos conforme lista a seguir.
Periódicos
LEITE, G. DE N. P.; ARAÚJO, A. M.; ROSAS, P. A. C. Prognostic techniques applied to maintenance of wind turbines: a concise and specific review. Renewable and Sustainable Energy Reviews, n. June, 2017.
LEITE, G. DE N. P.; ARAÚJO, A. M.; ROSAS, P. A. C.; Detecção de falhas em componentes mecânicos a partir da utilização de técnicas de entropia da informação. Revista CIENTEC. 2018.
LEITE, G. DE N. P.; WESCHENFELDER, F.; Utilização de energia solar fotovoltaica integrado com sistemas de climatização conectados ao SIN no Brasil: estudo da viabilidade técnica-econômica. Revista CIENTEC. 2018.
Congressos
SILVA, V., LEITE, G. N. P., ARAÚJO A. M.; Vibration analysis of wind turbine bearing based on information theory quantifiers, 24th ABCM International Congress of Mechanical
Engineering, Curitiba, 2017.
LEITE, G. DE N. P.; ARAÚJO, A. M.; ROSAS, P. A. C.; Detecção de falhas em componentes mecânicos a partir da utilização de técnicas de entropia da informação. SNCT, Recife, 2018. LEITE, G. DE N. P.; WESCHENFELDER, F.; Utilização de energia solar fotovoltaica integrado com sistemas de climatização conectados ao SIN no Brasil: estudo da viabilidade técnica-econômica. I Workshop Regional de Refrigeração e Climatização. 2018.
Submetidos (periódicos)
LEITE, G. DE N. P.; ARAÚJO, A. M.; ROSAS, P. A. C.; STOSIC, T.; STOSIC, B. Entropy measures for early detection of bearing faults. Physica A, 2018
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ANEXO A - ROTINAS DESENVOLVIDAS
Relação das rotinas principais desenvolvidas na tese de doutorado: “DIAGNÓSTICO DE FALHAS EM COMPONENTES DE TURBINAS EÓLICAS ATRAVÉS DA APLICAÇÃO DE QUANTIFICADORES DA TEORIA DA INFORMAÇÃO”
Rotinas R Descrição
histograma.R Análise de série temporal e histograma
de uma série aleatória e uma série constante
renyi_fisher_bernoulli.R Análise da entropia de Rényi e informação de Fisher para vários valores de alfa para a distribuição de Bernoulli
rotina_teste_logistic.R logistic_map.R
Análise do mapa logístico e das PMFs para os valores de r igual a 2,5, 3,5 e 3,9 periodic_radom_data_evaluation_port.R Análise dos dados periódico-aleatórios, series temporais, PMFs e plano entropia-complexidade
synthetic_data_evaluation.R Cálculo da entropia de Shannon, Rényi e divergência de Jensen-Rényi para as PMF(PS, BP, WPT e EEMD)
my_fft.R Cálculo da FFT de um sinal 𝒙(𝒕) com
frequência de amostragem 𝒇𝒔
PMF_PS.R Cálculo da PMF baseada no método da
potência espectral
PMF_BP.R Cálculo da PMF baseada no método de
Bandt e Pompe
PMF_WPT.R Cálculo da PMF baseada no método
wavelet packet tree
PMF_EEMD.R Cálculo da PMF baseada no método
ensemble empirical mode decomposition shannon_entropy.R Cálculo da entropia de Shannon para
uma dada PMF
rényi_entropy.R Cálculo da entropia de Rényi para uma
dada PMF e um valor dado para o coeficiente 𝜶
jensen_shannon_divergence.R Cálculo da divergência de Jensen- Shannon
jensen_renyi_divergence.R Cálculo da divergência de Jensen- Rényi
Rotinas Octave Descrição
bearing_simulation_localfault.m Geração dos dados sintéticos de rolamentos com falhas a partir do princípio da cicloestacionariedade
ANEXO B - ZOOM DOS PLANOS ENTROPIA-COMPLEXIDADE E ENTROPIA-INFORMAÇÃO DE FISHER Figura 96 – Zoom do plano entropia de Shannon-complexidade para o rolamento 3 do banco de dados 1.
Figura 97 – Zoom do plano entropia de Shannon-complexidade para o rolamento 4 do banco de dados 1.
Figura 98 – Zoom do plano entropia de Shannon-complexidade para o rolamento 1 do banco de dados 2.
Figura 99 – Zoom do plano entropia de Rényi-complexidade para o rolamento 3 do banco de dados 1.
Figura 100 – Zoom do plano entropia de Rényi-complexidade para o rolamento 4 do banco de dados 1.
Figura 101 – Zoom do plano entropia de Rényi-complexidade para o rolamento 1 do banco de dados 2.
Figura 102 – Zoom do plano entropia de Shannon-Informação de Fisher para os rolamentos 3 e 4 do banco de dados 1 e rolamento 1 do banco de dados 2.