A5048414078- Ultrasonics and Acoustic Wave Propagation
- Structural Health Monitoring Techniques
- Acoustic Wave Resonator Technologies
- Non-Destructive Testing Techniques
- Geophysical Methods and Applications
- Image and Signal Denoising Methods
- Ultrasound Imaging and Elastography
- Medical Image Segmentation Techniques
- Advanced MEMS and NEMS Technologies
- Advanced Fiber Optic Sensors
- Indoor and Outdoor Localization Technologies
- Smart Materials for Construction
- Sparse and Compressive Sensing Techniques
- Prostate Cancer Diagnosis and Treatment
- Advanced Image Processing Techniques
- Photoacoustic and Ultrasonic Imaging
- Blind Source Separation Techniques
- Microwave Imaging and Scattering Analysis
- Healthcare Technology and Patient Monitoring
- Flow Measurement and Analysis
- AI in cancer detection
- Optical measurement and interference techniques
- Advanced Neural Network Applications
- Infrastructure Maintenance and Monitoring
- Concrete Corrosion and Durability
University of Bologna
2015-2024
Laboratori Guglielmo Marconi (Italy)
2015-2023
Marconi University
2015-2023
Advanced Computer System (Italy)
2019-2021
Dayalbagh Educational Institute
2016
Structural health monitoring (SHM) is becoming increasingly attractive for its potentialities in many application contexts, such as civil and aeronautical engineering. In these scenarios, modern SHM systems are typically constituted by a multitude of sensor nodes. Such devices should be based on low-cost low-power solutions both to ease the deployment progressively denser networks compatible with permanent installation; this allows real-time while reducing global maintenance costs. Among...
The main challenge in the implementation of long-lasting vibration monitoring systems is to tackle constantly evolving complexity modern "mesoscale" structures. Thus, design energy-aware solutions promoted for joint optimization data sampling rates, onboard storage requirements, and communication payloads. In this context, present work explores feasibility rakeness-based compressed sensing (Rak-CS) approach tune mechanism on second-order statistics measured data. particular, a novel...
The deployment of Structural Health Monitoring (SHM) systems is a natively interdisciplinary task that involves joint research contributions from sensing technologies, data science and civil engineering. capability to assess, also remote stations, the working conditions industrial plants or structural integrity buildings widely requested in many application fields. technological development aims continuously provide innovative tools approaches satisfy these demands. As first instance,...
This paper presents a novel implementation of Frequency Steerable Acoustic Transducers (FSATs) for guided waves (GWs) inspections. Unlike the conventional phased array systems, which demand large number transducers and complex wiring, FSATs benefit from inherent directional properties generation sensing ultrasonic waves, resulting in significant hardware simplification cost reductions GWs-based systems. The exploit frequency-dependent spatial filtering effect, leading to direct relationship...
In this work, different types of artificial neural networks are investigated for the estimation time arrival (ToA) in acoustic emission (AE) signals. particular, convolutional network (CNN) models and a novel capsule proposed place standard statistical strategies which cannot handle, with enough robustness, very noisy scenarios and, thus, be sufficiently reliable when signal statistics perturbed by local drifts or outliers. This concept was validated two experiments: pure ToA identification...
One of the main challenges faced by structural health monitoring community is acquiring and processing huge sets acoustic wavefield data collected from sensors, such as scanning laser Doppler vibrometers or ultrasonic scanners. In fact, extracting information that allows estimation damage condition a structure can be time-consuming process. This paper presents detection localization technique based on compressive sensing algorithm, which significantly us to reduce acquisition time without...
The structural health monitoring of composite laminates is a rapidly emerging need in applications. Different real-time sensors integrated into have been proposed, such as fiber Bragg gratings and piezoceramics. However, their presence negatively affects the mechanical properties hosting laminate. This work proposes non-invasive method for piezoelectric functionalization by interleaving lead zirconate titanate micrometric powder between glass-fiber-reinforced polymer plies. effects different...
This work describes a network of low power/low-cost microelectromechanical- (MEMS-) based three-axial acceleration sensors with local data processing and data-to-cloud capabilities. In particular, the developed sensor nodes are capable to acquire time series extract their frequency spectrum peaks, which autonomously sent through an ad hoc gateway device online database using dedicated transfer protocol. The minimizes power consumption monitor remotely in real spectra peaks at each node. An...
This article reports on the creation of an open database piezo-actuated and piezo-received guided wave signals propagating in a composite panel full-scale aeronautical structure. The closes bottom part wingbox that, along with leading edge, trailing wingtip, forms outer wing demonstrator approximately 4.5 m long from 1.2 to 2.3 wide. To create database, structural health monitoring system, composed software/hardware central unit capable controlling network 160 piezoelectric transducers...
Condition Monitoring (CM) is an extremely critical application of the Internet Things (IoT) within Industry 4.0 and Smart City scenarios, especially following recent energy crisis. CM aims to monitor status a physical appliance over time in real order react promptly when anomalies are detected, as well perform predictive maintenance tasks. Current deployments suffer from both interoperability management issues their engineering process at all phases– design deployment, management–, often...
Assessing the integrity of industrial and civil appliances has become a priority worldwide. Noteworthy, this goal requires strong synergy between multiple tools, disciplines, approaches to be attained via joint hardware-software co-design different Structural Health Monitoring (SHM) system components. This work proposes <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math...
A novel strategy to design piezoelectric sensors suited for direction of arrival (DoA) estimation incoming Lamb waves is presented in this work. The designed sensor composed by two patches (P1, P2) bonded on the structure be inspected. In particular, exploiting Radon transform, proposed procedure computes shape P2 given P1 so that difference time (DToA) at linearly related DoA while being agnostic waveguide dispersion curves. With a dedicated processing procedure, waveforms acquired from...
This work describes a miniaturized sensor network based on low-power, light-weight and small footprint microelectromechanical (MEMS) nodes capable to simultaneously measure tri-axial accelerations angular velocities. A real-time data fusion algorithm complementary filters is applied extract tilt angles. The resulting device designed show competitive performance over the whole frequency range of inertial units. Besides capability provide accurate measurements both in static dynamic...
Guided wave-based monitoring systems which involve multiple transmitting piezo-transducers permanently in-stalled on structures, often rely time or frequency-division multiplexing schemes. Alternatively, strategies employing code-division are becoming increasingly popular. These techniques beneficial since the transmitted signals can be used at same for probing inspected structures and communicating data. However, to implement effective communication mechanisms, detrimental effects due...
This paper illustrates a Human-Machine Interface based on Augmented Reality (AR) conceived to provide maintenance operators the results of an impact detection methodology. In particular, implemented tool dynamically interacts with head portable visualization device allowing inspector see estimated position structure. The methodology combines signals collected by network piezosensors bonded structure be monitored. Then signal processing algorithm is applied compensate for dispersion acquired...
Guided Wave (GW) testing for Structural Health Monitoring (SHM) is complicated by dispersion in wave mode propagation. In particular, the dispersive behavior of GWs hinders an accurate estimation direction arrival monitoring Difference Time Arrival (DToA) associated to different sensors, as normally happens bulk applications. this work, a novel procedure passive sensors which overcomes limitation and precisely locates propagation presented. The proposed based on Continuous Wavelet Transform...
In this work we study methodologies for speckle extraction and analysis in ultrasound biomedical images. Assuming a multiplicative noise model, the investigated methods exploit decorrelating properties of wavelet transform non-stationary signals. The efficiency preprocessing procedures which decompose acquired signal into coherent diffuse component is investigated. different approaches are evaluated terms computational cost effectiveness tissue characterization human prostates affected by...
In this work, a small footprint, low power, and light weight sensor node for guided wave detection on laminate composite metallic structures is presented. This device meant as basic building block smart structure passive networks development. It draws power from two-wires data-over-power (DoP) network communication interface, which also used half-duplex data handling at 200kbps. Each roughly 20x24mm, consumes less than 40mW, weights 20 grams, making it attractive aerospace systems where...
In this work a pulse-echo procedure suitable to locate defect-induced reflections in irregular waveguides is proposed. particular, the extracts distance of propagation guided wave scattered from defect within echo signal, revealing thus source-defect distance. To such purpose, first, Warped Frequency Transform (WFT) used compensate signal dispersion due traveled portion waveguide that assumed as reference. Next, pulse compression applied remove additional introduced by remaining waveguide....
This article demonstrates the use of guided elastic waves (GEW) for multiple-in and multiple-out (MIMO) data communication in framework a structural health monitoring (SHM) system. Therefore, miniaturized low-voltage nodes have been developed. They are arranged spatially distributed permanently installed network. Wireless exchange encoded information across metallic plate stiffened carbon-fiber reinforced plastics (CFRP) structure is investigated. A combination square-wave excitation...