A scalable data-driven approach to temperature baseline reconstruction for guided wave structural health monitoring of anisotropic carbon-fibre-reinforced polymer structures

Yue, Nan; Aliabadi, M.H.

doi:10.1177/1475921719887109

Cited by 68 publications

(66 citation statements)

References 24 publications

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“…While the conversion step ensures hybrid paths are comparable to each other, it does not remove the effect of temperature on the Lamb wave propagation. As it has been demonstrated [ 62 ], the effect of temperature variation on the propagated wave is change in amplitude and phase, depending on the material properties of the host and the frequency of the travelling wave. In order to correct of the amplitude, the damage signals are scaled to their reference or pristine counterparts.…”

Section: Hybrid Pzt-fo Data Acquisition Systemmentioning

confidence: 99%

Development of Hybrid Piezoelectric-Fibre Optic Composite Patch Repair Solutions

Lambinet

Khodaei

2021

Sensors

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This paper proposes a hybrid structural health monitoring (SHM) solution for a smart composite patch repair for aircraft structures based on piezoelectric (PZT) and fibre optic (FO) sensors to monitor the integrity of a the bondline and detect any degradation. FO sensors are used to acquire guided waves excited by PZT transducers to allow the advantages of both sensor technologies to be utilised. One of the main challenges of guided wave based detection methodologies is to distinguish the effect of temperature on the propagating waves, from that of an existing damage. In this research, the application of the hybrid SHM system is tested on a composite step sanded repair coupon under operational condition (temperature variation) representative of an aircraft for the first time. The sensitivity of the embedded FO sensor in recording the strain waves is compared to the signals acquired by PZT sensors under varying temperature. A novel compensation algorithm is proposed to correct for the effect of the temperature on the embedded FO sensor spectrum in the hybrid set-up. The repaired specimen is then impacted with a drop mass to cause barely visible impact damage (BVID). The hybrid SHM system is then used to detect the damage, and its diagnosis results are compared to a PZT only based smart repair solution. The results show promising application of the hybrid solution for monitoring bondline integrity as well as highlighting challenges of the embedding of FO sensors for a reliable and repeatable diagnosis.

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Section: Hybrid Pzt-fo Data Acquisition Systemmentioning

confidence: 99%

Development of Hybrid Piezoelectric-Fibre Optic Composite Patch Repair Solutions

Lambinet

Khodaei

2021

Sensors

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“…Temperature compensation of guided wave measurements was not necessary As the temperature variation was small (within 2 • C). Temperature compensation method can be implemented for airframe structures in the case of greater temperature variation [6].…”

Section: Quantification Of Gwshm On Cfrp Couponsmentioning

confidence: 99%

“…This causes a significant level of uncertainty in the sensor measurements which cannot be ignored and requires the application of statistical analysis techniques to take into account their effects. To add further complication, the environmental and operational conditions can have different effects on guided waves depending on the material as well as the type of damage present [6]. In order to achieve highly accurate damage identification using GWSHM systems under the required service conditions for an aircraft, the uncertainties due to environmental and operational conditions mentioned earlier, as well as the uncertainties in the characteristics of the damage must be quantified for the range of materials present in the aircraft.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical approach for uncertainty quantification and reliability assessment of guided wave-based structural health monitoring

Yue

Aliabadi

2020

Structural Health Monitoring

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In this article, a hierarchical approach is proposed for the design and assessment of a guided wave-based structural health monitoring system for the detection and localisation of barely visible impact damage in composite airframe structures. The hierarchical approach provides a systemic and practical way to establish guided wave-based structural health monitoring systems for different structures in the presence of uncertainties and to quantify system performance. The proposed approach is carried out in four steps: (1) determine optimal sensor placement for the target structure and its plausible impact scenarios, (2) set detection threshold for global damage index based on the noise level present in the required environmental and operations conditions, (3) detect damage in critical locations and quantify detection performance by calculating the probability of detection, probability of false alarm and detection accuracy and (4) locate the detected damage while also quantifying the accuracy of location estimation and the probability of correctly indicating if the damage is in an area critical to the integrity of the structure. The proposed approach is demonstrated in aircraft carbon fibre-reinforced polymer structures from coupon level (simple flat panels) to sub-component level (large flat panel with multiple carbon fibre-reinforced polymer stringers and aluminium frames) for the detection and localisation of barely visible impact damage.

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“…However, they can suffer from unforeseen impact events during their operation and maintenance, which may result in barely visible damages. Structural health monitoring (SHM) is a promising nondestructive inspection technique which offers a realtime damage detection under operational and environmental conditions for aircrafts [6][7][8][9]. There are many different types of sensors that can be used in SHM, such as strain gauges [4], optical fibres (OF) [10], carbon nanotube (CNT) sensing networks [11], and piezoelectric lead zirconate titanate (PZT) transducers [12].…”

Section: Introductionmentioning

confidence: 99%

Structural Integrity Assessment of Composites Plates with Embedded PZT Transducers for Structural Health Monitoring

Feng

2021

Materials

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Active sensing using ultrasonic guided waves (UGW) is widely investigated for monitoring possible damages in composite structures. Recently, a novel diagnosed film based on a circuit-printed technique with piezoelectric lead zirconate titanate (PZT) transducers has been developed. The diagnostic film is a replacement for the traditional cable connection to PZT sensors and has been shown to significantly reduce the weight of the host structure. In this work, the diagnosed films were embedded into composite structures during manufacturing using a novel edge cut-out method during lay-up, which allowed for edge trimming after curing. In this paper, the effect of fatigue loading on the integrity of PZT transducers is initially investigated. The electro-mechanical impedance (EMI) properties at different fatigue loading cycles were used as the diagnostic measure for the performance of the sensors. At the same time, the behaviours of UGW were investigated at different fatigue loading cycles. It was found that the EMI properties and active sensing behaviours remained stable up to 1 million cycles for the force ranges of 0.5~5 kN and 1~10 kN. Next, the effect of embedding the diagnosed film on the mechanical properties of the host composite structure was investigated. Tensile and compressive tests were conducted and the elastic modulus of composite coupons with and without embedded PZT diagnosed films were compared. The elastic modulus of composite coupons with PZT diagnosed films embedded across the entire coupon reduced by as much as 20% for tensile tests and just over 10% for compressive tests compared to the coupons without embedded sensors. These reductions are considered the worst-case scenario, as in real structures the film would only be embedded in a relatively small area of the structure.

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A scalable data-driven approach to temperature baseline reconstruction for guided wave structural health monitoring of anisotropic carbon-fibre-reinforced polymer structures

Cited by 68 publications

References 24 publications

Development of Hybrid Piezoelectric-Fibre Optic Composite Patch Repair Solutions

Development of Hybrid Piezoelectric-Fibre Optic Composite Patch Repair Solutions

Hierarchical approach for uncertainty quantification and reliability assessment of guided wave-based structural health monitoring

Structural Integrity Assessment of Composites Plates with Embedded PZT Transducers for Structural Health Monitoring

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