The joints between structural elements should ensure safe usage of the structure. One joining method is based on adhesive bonding. However, bonding has not replaced riveting yet. Rivets are still present even in newest composite aircraft AIRBUS 350. reliability limits use for primary structures and there a search new non-destructive testing tools allowing to (1) assessment surfaces before (2) bond. performance bonds depends physico-chemical properties bonded surfaces. contamination leading...

The development of structural health monitoring (SHM) systems and their integration in actual structures has become a necessity as it can provide robust low-cost solution for the integrity ability to predict remaining life structures. In this review, we aim at focusing on one important issues SHM, design, implementation sensor networks. Location number sensors, any SHM system, are high importance they impact system integration, performance, accuracy assessment, well total cost. Hence...

This paper aims to investigate the use of ultrasonic guided wave (GW) propagation mechanism and assessment debonding in a sandwich composite structure (SCS) using multi-step approach. Towards this, series GW propagation-based laboratory experiments numerical simulations have been carried out on SCS sample. The regions variable size locations were assessed pre-defined network piezoelectric lead zirconate transducers (PZT). Besides, several artificial masses also placed validate structural...

In this paper results of investigation on concentrated piezoelectric networks with different configurations are presented. They were used for elastic wave generation and acquisition. The propagation phenomenon was damage localization in thin aluminium panels. This approach utilized the fact that any discontinuities existing structural elements cause local changes physical material properties which affect propagation. Elastic waves excited received using transducer element arrangements....

In this study, a two-level scanning strategy for noncontact laser ultrasonic measurement system is proposed to expedite the inspection of wind turbine blade. First, coarse entire blade performed with low spatial resolution initial delamination localisation. Then, dense high only within identified delaminated region visualization. This study especially focuses on localisation using adaptive scanning. Laser responses from two pitch-catch paths, names pairs, are obtained specified grid....

Guided waves (GW) allow fast inspection of a large area and hence have attracted research interest from the structural health monitoring (SHM) community. Thus, GW-based SHM is ideal for thin structures such as plates, pipes, etc., finding applications in several fields like aerospace, automotive, wind energy, etc. The GW propagate along surface sample get reflected discontinuities structure form boundaries damage. Through proper signal processing based on their time arrival, damage can be...

Abstract The paper emphasizes an effective quantification of hidden damage in composite structures using ultrasonic guided wave (GW) propagation-based structural health monitoring (SHM) and artificial neural network (ANN) based active infrared thermography (IRT) analysis. In recent years, there has been increased interest a global-local approach for localization purposes. global is mainly used identifying the damage, while local quantifying. This presents proof-of-study to use such...

A method for damage localization based on the phased array idea has been developed. Four arrays of transducers are used to perform a beam-forming procedure. Each consists nine placed along line, which able excite and register elastic waves. The 0 Lamb wave mode chosen method. in such way that angular difference between them is 45° rotation point middle transducer, common all arrays. tested square aluminium plate modeled by Spectral Element Method. Two types were considered, namely...

This article deals with damage detection process under varying temperature. Carbon fibre–reinforced polymer samples are investigated using electromechanical impedance method. In the article, influence of changing temperature on resistance in is investigated. Authors propose new approach for compensation detection. Damage based root mean square deviation index. Due to strong damping utilized composite material, low-frequency range this research. Real part measured frequency band 1–20 kHz....

The paper presents multiple impact damage detections and characterization in a multi-layered carbon fiber reinforced polymer structure using multi-step combination of the global area local detection methods. A analysis laser Doppler vibrometer (LDV) with piezoelectric lead zirconate titanate (PZT) actuator-based guided waves (GW) excitation was used to detect locate damage. GW full wavefield (FWF) mode conversion root mean square (RMS) based LDV studies helped visualize crack (ICD) when...

In the presented research authors investigated electromechanical impedance (EMI) technique in context of damage detection. The EMI method has been studied for considerable amount time detecting metallic, composite, concrete, and other parts. Here, focus is put on GFRP (glass fibre reinforced polymer) composites. Both a beam plate was investigated. samples were prepared with simulated damage. Impact introduced as well delamination. Authors have developed data processing tool based principal...

The electromechanical impedance (EMI) method has shown its damage detection capability for lightweight structures due to sensitivity. In this paper, a new technique based on the uniform sensor network multiple localization was proposed. EMI-based indices were obtained from several piezoelectric transducers and fused multiple-damage first time in literature. proposed approach, sub-network selection employs vertices of triangle calculated sensing region radius. sub-networks allow sites without...

Abstract This paper proposes a new sensor network optimized data fusion approach for structural health monitoring of metallic structures using electromechanical impedance (EMI) signals. The integrated used to fuse common healthy state baseline model based damage detection, quantification and classification in EMI technique. Towards this, the principal component analysis (PCA) is carried out corresponding root mean square deviation (RMSD) index calculated study information piezoelectric...

Abstract This article presents an embedded signal processing subsystem constituting a part of whole structural health monitoring system (SHM). Typical SHM is responsible for elastic wave generation and sensing, acquisition, processing. Signal was designed with the aim localizing damage utilizing propagation in interrogated structure. The realized field programmable gate array chip, which also implements localization algorithm creating maps that can indicate reflection sites within...