Fault detection in a rotating shaft by using the electromechanical impedance method and a temperature compensation approach

Cavalini, Aldemir Ap; Oliveira, D. D. de; Rabelo, Diogo de Souza; Neto, Roberto Mendes Finzi; Steffen, Valder

doi:10.20906/cps/cilamce2015-0381

Cited by 5 publications

(6 citation statements)

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“…However, equation ( 11) provides a confidence interval of the mean with the assumption that the sample variance is equal to the population variance. In this work, equation (11) was used to estimate the mean confidence interval since normality has been previously checked.…”

Section: Threshold Determination With Statistical Process Control and Confidence Intervalsmentioning

confidence: 99%

“…Temperature variation effects and compensation procedures for these effects have been widely studied. [5][6][7][8][9][10][11] Besides temperature variation effects, other environmental effects have been investigated for the ISHM technique, 12 which shows through analysis of variance that the temperature is the most significant effect that reflects on the impedance signatures.…”

Section: Introductionmentioning

confidence: 99%

“…8,9 Next, a statistical model was developed to establish threshold indexes according to a predefined level of confidence. 37 Thus, this work provides a sensitivity assessment of the ISHM technique considering the rate of success in order to detect the damage inserted for aluminum plates under varying temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impedance-based structural health monitoring and statistical method for threshold-level determination applied to 2024-T3 aluminum panels under varying temperature

Rabelo

Steffen

Neto

et al. 2016

Structural Health Monitoring

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The impedance-based structural health monitoring method has become a promising and attractive tool for damage identification and is considered a nondestructive evaluation technique. However, conventional impedance-based structural health monitoring studies have mainly focused on structural damage identification but not so much on statistical modeling approaches in order to determine a threshold for the decision making of the damage detection system. In this study, the impedance-based structural health monitoring technique is used in a damage detection problem considering temperature variation effects. For this aim, three aluminum 2024-T3 plates were instrumented with small lead zirconate titanate patches close to their borders, and damage was introduced in the central position of the plates, with temperature ranging from −10°C to 60°C. This article proposes a method to statistically determine a threshold for damage detection purposes using concepts of statistical process control, as well as confidence intervals and normality tests in order to obtain a diagnosis with a previously determined confidence level. Thus, this work presents a sensitivity evaluation of the impedance-based structural health monitoring technique as applied to aluminum plates under varying temperature. With the technique proposed, damage threshold levels are determined so that lead zirconate titanate patches placed approximately 280 mm from the damage inserted were able to detect saw cuts of approximately 7 mm long, with 95% confidence intervals inside the temperature range considered.

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Section: Threshold Determination With Statistical Process Control and Confidence Intervalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impedance-based structural health monitoring and statistical method for threshold-level determination applied to 2024-T3 aluminum panels under varying temperature

Rabelo

Steffen

Neto

et al. 2016

Structural Health Monitoring

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“…Portanto, a compensação da temperatura é imperativa para obter um diagnóstico confiável da integridade estrutural (KIJANKA et al, 2013, HARLEY;MOURA, 2012, ROCHA;RABELO;, BAPTISTA et al, 2014STEFFEN Jr., 2015, CAVALINI et al, 2015.…”

Section: Testes Experimentaisunclassified

“…O desvio de frequência para compensação de temperatura através desta técnica é geralmente escolhido como resultado de um problema de otimização simples onde busca maximizar o Coeficiente de Correlação. Como resultado, a métrica de dano (MD) é sempre minimizada mesmo quando o dano está presente na assinatura de impedância (RABELO et al, 2015). Já no processo de tomada de decisão, a estatística é uma aliada fundamental para o sucesso do esforço de monitoramento, sendo uma das principais ferramentas de SHM.…”

Section: Testes Experimentaisunclassified

Identificação de dano em estruturas utilizando uma metodologia que integra a técnica da impedância eletromecânica e ondas de Lamb

Rocha¹

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The present work is dedicated to the monitoring of structural health (SHM), that is the development of a procedure that interrogates a structure to detect, locate and identify damages. Today, SHM represents one of the main areas of interest in engineering and it is applied for both maintenance cost reduction and operational safety. In this thesis was performed the fault diagnosis of a panel of material typical of the aeronautical industry, through the integration of two SHM techniques, namely the electromechanical impedance technique and Lamb waves. For the diagnosis, the damage metrics extracted from the impedance signatures of the structure were used together with an algorithm for the location of the damage considering Lamb waves. Temperature compensation techniques were systematically to avoid false diagnoses. A statistical model was developed to establish threshold indices according to a predefined confidence level. Thus, this work presents an evaluation of the sensitivity of the proposed techniques, considering a success rate. To ensure the integration of the two SHM techniques for aeronautical applications, a dedicated hardware was designed so that its architecture allows the cooperative integration of the two SHM techniques used. Finally, the obtained results demonstrate the great potential of the integration of the two techniques proposed in conjunction with the hardware developed the mathematical and computational methodologies.

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Damage Detection Integrating ISHM and LWSHM Techniques

Rocha

Neto

Steffen

2018

Special Topics in Structural Dynamics, Volume 5

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Fault detection in a rotating shaft by using the electromechanical impedance method and a temperature compensation approach

Cited by 5 publications

References 0 publications

Impedance-based structural health monitoring and statistical method for threshold-level determination applied to 2024-T3 aluminum panels under varying temperature

Impedance-based structural health monitoring and statistical method for threshold-level determination applied to 2024-T3 aluminum panels under varying temperature

Identificação de dano em estruturas utilizando uma metodologia que integra a técnica da impedância eletromecânica e ondas de Lamb

Damage Detection Integrating ISHM and LWSHM Techniques

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