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Rok 2024
  • Guided wave propagation in debonding detection in CFRP-reinforced steel plate-like structures
    Publikacja

    - OCEAN ENGINEERING - Rok 2024

    The present study investigates the guided wave propagation in multilayered steel specimens reinforced with carbon fiber reinforced polymer (CFRP) through theoretical, numerical, and experimental means. The effectiveness of externally bonded reinforcement (EBR) relies heavily on the bonding quality between the CFRP and the substrate. Premature debonding, a prevalent and hazardous defect, can arise from suboptimal manufacturing processes,...

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  • Nondestructive corrosion degradation assessment based on asymmetry of guided wave propagation field
    Publikacja

    - ULTRASONICS - Rok 2024

    The article presents the results of numerical and experimental investigation of guided wave propagation in steel plates subjected to corrosion degradation. The development of novel procedures allowing for the assessment of the corrosion degradation level is crucial in the effective diagnostics of offshore and ship structures that are especially subjected to aggressive environments. The study’s main aim is to investigate the influence...

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Rok 2023
Rok 2022
  • Corrosion degradation monitoring of ship stiffened plates using guided wave phase velocity and constrained convex optimization method

    The study presents an experimental investigation on the corrosion degradation level assessment using nondestructive wave-based methods. The degradation level of ship structural elements has been assessed in two different ways. The first one is based on the spectral decomposition and zero-crossing incorporated reconstruction of the dispersion curve approach of the antisymmetric Lamb wave mode and the best matching of the theoretical...

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  • Data Compression in Ultrasonic Network Communication via Sparse Signal Processing
    Publikacja
    • B. Zima
    • O. Reyes Márquez
    • M. Mohammadgholiha
    • J. Moll
    • L. Marchi De

    - Rok 2022

    This document presents the approach of using compressed sensing in signal encoding and information transferring within a guided wave sensor network, comprised of specially designed frequency steerable acoustic transducers (FSATs). Wave propagation in a damaged plate was simulated using commercial FEM-based software COMSOL. Guided waves were excited by means of FSATs, characterized by the special shape of its electrodes, and modeled...

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  • Determination of stepped plate thickness distribution using guided waves and compressed sensing approach
    Publikacja

    - MEASUREMENT - Rok 2022

    Guided waves recently have attracted significant interest as a very promising research area. The signals registered by a specially designed sensor network are processed to assess the state of the tested structure. Despite the constant development of novel damage detection algorithms employing guided waves, the phenomenon of wave propagation still needs detailed recognizing and understanding for the further progress of non-destructive...

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  • Experimental and numerical identification of corrosion degradation of ageing structural components
    Publikacja

    - OCEAN ENGINEERING - Rok 2022

    The study presents experimental and numerical identification of corrosion degradation of thin-walled structural components employing guided wave propagation. The steel structural components are subjected to through-thickness varying corrosion degradation levels. The developed approach using the non-destructive guided wave-propagation quantifies the equivalent average corrosion degradation level by exploring a limited number of...

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  • Research on Linear Actuators for Active Foil Bearings
    Publikacja
    • Ł. Breńkacz
    • R. Kędra
    • W. Janicki
    • A. Maurin
    • P. Bagiński
    • A. Andrearczyk
    • B. Zima

    - Materials - Rok 2022

    Active foil bearings are a kind of gas foil bearing. They contain actuators which allow for modification of the bearing sleeve size and the shape of the lubrication gap. Rotor vibrations can be actively controlled by these changes. It is possible, among other things, to reduce the starting torque, control the vibration amplitude at different speeds and improve operational safety. Prototypes of active foil bearings are being developed...

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  • The vibration-based assessment of the influence of elevated temperature on the condition of concrete beams with pultruded GFRP reinforcement
    Publikacja

    Concrete beams reinforced with glass fiber reinforced polymer (GFRP) bars subjected to elevated temperature have been experimentally studied. The influence of high temperatures on GFRP-reinforced concrete beams condition has been check both, destructively and nondestructively. The nondestructive tests foresaw vibration-based tests to obtain the natural frequency values after exposure to varying temperatures. The vibration-based...

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Rok 2021
  • Baseline-free debonding detection in reinforced concrete structures by elastic wave propagation
    Publikacja

    - MEASUREMENT - Rok 2021

    The article presents the results of the numerical and experimental analysis concerning wave propagation in reinforced concrete (RC) beams with various extent of debonding between the steel rod and concrete cover. The main aim of the paper was to consider the unsolved research gaps, which considerably limit the application of wave-based methods in practice. The propagation of the flexural wave modes excited and registered on the...

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  • Damage detection in plates based on Lamb wavefront shape reconstruction
    Publikacja

    - MEASUREMENT - Rok 2021

    Many of the current studies in the area of damage detection using elastic wave propagation are based on deploying sensor networks with a large number of piezoelectric transducers to detect small-size cracks. A major limitation of these studies is that cracks are usually larger and have different shapes in real cases. Moreover, using a large number of sensing nodes for damage detection is both costly and computationally intensive....

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Rok 2020
Rok 2019
  • Debonding Detection in Reinforced Concrete Beams with the Use of Guided Wave Propagation
    Publikacja

    - Rok 2019

    One of the most frequent damage of the reinforced concrete structures is debonding between steel bar and concrete cover. In the case of debonding occurrence not only the strength of the structure decreases, but also it is more vulnerable to corrosion damages. For this reason fast and effective methods of debonding detection in an early stage of its development need a significant boost. The paper presents analytical and experimental...

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  • Guided Wave Propagation in Detection of Partial Circumferential Debonding in Concrete Structures
    Publikacja

    - SENSORS - Rok 2019

    The following article presents results of investigating the damage detection in reinforced concrete beams with artificially introduced debonding between the rod and cover, using a non-destructive method based on elastic waves propagation. The primary aim of the research was to analyze the possible use of guided waves in partial circumferential debonding detection. Guided waves were excited and registered in reinforced concrete...

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  • Numerical investigation of the core eccentricity effect on wave propagation in embedded waveguide
    Publikacja

    The paper presents results of theoretical and numerical investigation of guided wave propagation in two-layer bars with geometric imperfections in the form of eccentric location of steel core. Steel rod of diameter equal to 1 cm embedded in composite mortar-type cover with external diameter equal to 5 cm has been taken into consideration. Several different rods with variable size of eccentricity are analysed. Results for rods with...

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  • Reference-free determination of debonding length in reinforced concrete beams using guided wave propagation

    This paper presents theoretical and experimental investigations of guided wave propagation in reinforced concrete beams, with pre-existing debonding between steel rebars and concrete blocks, for the purpose of damage detection. The primary aim of these investigations was a detailed analysis of the possible applications of wave propagation in single and multiple debonding detection in reinforced concrete structures and reference-free...

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  • RMS-based damage detection in reinforced concrete beams: numerical simulations
    Publikacja

    Image-based damage detection methods using guided waves are well known and widely applied approaches in structural diagnostics. They are usually utilized in detection of surface damages or defects of plate-like structures. The article presents results of the study of applicability of imaging wave-based methods in detection in miniscule internal damage in the form of debonding. The investigations were carried out on numerical models...

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