Structural Health Monitoring of Aircraft Structures

Rocha, Bruno; Silva, C.; Keulen, Casey J.; Yıldız, Mehmet; Suleman, Afzal

doi:10.1007/978-3-7091-1390-5_2

Cited by 15 publications

(14 citation statements)

References 17 publications

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“…In addition to detecting damage, some SHM systems can locate, quantify, and determine the type of damage, allowing for a prediction of the monitored structure and efficient predictive maintenance. The main fields of application include civil infrastructures, such as bridges [5] and pipes [6], and aircraft structures [7]. Metal and concrete structures have been a particular focus in the literature, but in recent years, increasing interest has arisen in composite materials, which are commonly used in aircrafts [8].…”

Section: Emi Technique Backgroundmentioning

confidence: 99%

Piezoelectric Transducers Assessed by the Pencil Lead Break for Impedance-Based Structural Health Monitoring

2015

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The pencil lead break (PLB) is a well-known method for characterizing acoustic emission sensors. In this paper, we analyze the effectiveness of this method in characterizing piezoelectric transducers for structural health monitoring (SHM) systems based on the electromechanical impedance (EMI) technique. Tests were carried out on aluminum beams of different sizes, and two types of transducers were considered: 1) lead zirconate titanate ceramics and 2) macrofiber composite devices. The experimental results indicate a clear relationship between the variation in the electrical impedance signature of the transducer and power spectral density obtained with the PLB method. Therefore, the PLB can be a simple and effective method for assessing the sensitivity of transducers for damage detection in SHM systems based on the EMI technique.

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Section: Emi Technique Backgroundmentioning

confidence: 99%

Piezoelectric Transducers Assessed by the Pencil Lead Break for Impedance-Based Structural Health Monitoring

2015

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“…These influences can be classified into four categories, namely: AE signal generation [2; 3], propagation [4], detection [5] as well as measurement and analysis of AE data [2], as illustrated in Figure 2. AE generation from fatigue cracks in metals can originate from different processes, such as fracture of inclusions, crack closure, plastic deformation or crack extension occurring during fatigue crack propagation [6].…”

Section: Aementioning

confidence: 99%

Development of Generic Methodology for Designing a Structural Health Monitoring Installation Based on the Acoustic Emission Technique

2014

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The Acoustic Emission (AE) technique can be used to perform damage detection and localisation for structural health monitoring purposes. Implementation in aircraft structures however poses a significant challenge as its performance in terms of damage detection and localisation is not well understood when used with complex structural geometries and variable operational service environments. This paper presents initial developments towards a generic methodology for optimal design of a structural health monitoring installation based on the acoustic emission technique. Performance verification of the AE monitoring process was classified into two stages. The first is a mainly empirical process for quantitatively characterising AE generation from damage using the Probability of Hit (POH) metric developed and presented in this study. The second is a combination of mathematical, numerical and empirical modeling to characterise AE propagation and detection which can also be used to determine optimal system configuration and sensor design. It was found that for Structural Health Monitoring (SHM) techniques to be part of wider structural integrity programmes, there is need for standards that recommend best practices as well as providing specification of acceptable levels of performance in terms of damage detection and location.

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“…The detection ability may be further improved by carefully selecting the excitation frequency and the lateral dimensions of the transducer in such a way that favors excitation of a desired mode while suppressing the generation of undesired modes. For instance, when a square wafer is used, it may be possible to select an excitation frequency at which the length of the wafer is an odd multiple of the half wavelength of a desired mode and at the same time a multiple of the wavelength of an undesired mode [10].…”

Section: Tuned Wave Excitation and Detection With Piezoelectricmentioning

confidence: 99%

A Methodological Review of Piezoelectric Based Acoustic Wave Generation and Detection Techniques for Structural Health Monitoring

Sun

Rocha

et al. 2013

International Journal of Aerospace Engineering

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Piezoelectric transducers have a long history of applications in nondestructive evaluation of material and structure integrity owing to their ability of transforming mechanical energy to electrical energy and vice versa. As condition based maintenance has emerged as a valuable approach to enhancing continued aircraft airworthiness while reducing the life cycle cost, its enabling structural health monitoring (SHM) technologies capable of providing on-demand diagnosis of the structure without interrupting the aircraft operation are attracting increasing R&D efforts. Piezoelectric transducers play an essential role in these endeavors. This paper is set forth to review a variety of ingenious ways in which piezoelectric transducers are used in today’s SHM technologies as a means of generation and/or detection of diagnostic acoustic waves.

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Structural Health Monitoring of Aircraft Structures

Cited by 15 publications

References 17 publications

Piezoelectric Transducers Assessed by the Pencil Lead Break for Impedance-Based Structural Health Monitoring

Piezoelectric Transducers Assessed by the Pencil Lead Break for Impedance-Based Structural Health Monitoring

Development of Generic Methodology for Designing a Structural Health Monitoring Installation Based on the Acoustic Emission Technique

A Methodological Review of Piezoelectric Based Acoustic Wave Generation and Detection Techniques for Structural Health Monitoring

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