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Year 2024
Year 2023
Year 2022
  • Advances in Modelling and Analysis of Strength of Corroded Ship Structures
    Publication

    The present study reviews the recent advances in modelling and analyses the strength of corroded ship structures. Firstly, the time-variant methodologies that consider only the mean structural element thickness loss due to corrosion degradation are identified. Corrosion degradation is regarded as the phenomenon that causes uneven thinning of specimens. This has been captured by various researchers as the loss of mechanical properties...

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  • 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
    Publication
    • B. Zima
    • O. Reyes Márquez
    • M. Mohammadgholiha
    • J. Moll
    • L. Marchi De

    - Year 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
    Publication

    - MEASUREMENT - Year 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
    Publication

    - OCEAN ENGINEERING - Year 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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  • Impact of thermal loading into the structural performance of ships: A review
    Publication

    The presented study reviews the recent advances done regarding the impact of thermal loading on the structural performance of ships. Firstly, the studies related to the mechanical and thermal properties of typical materials used in shipbuilding are outlined. Secondly, a brief introduction to the heat transfer analysis, Finite Element modelling and thermal stresses is provided. Finally, the review of papers dealing with the structural...

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  • Numerical modelling and analysis of steel specimens subjected to marine immersed corrosion and tensile load
    Publication

    - Year 2022

    The present study develops numerical models to analyse the behaviour of steel specimens subjected to marine immersed corrosion degradation and tensile load. The finite element method with the use of the explicit dynamic solver LS-DYNA, satisfying the quasi-static conditions, is employed. Two numerical models are developed, where in the first one, the scans of surfaces gathered from corroded plate specimens are implemented directly...

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  • Quasi-Static Response
    Publication
    • J. Underwood
    • E. Alley
    • J. Andric
    • D. Boote
    • Z. Gao
    • A. Van Hoeve
    • J. Jelovica
    • Y. Kawamura
    • Y. Kim
    • J. Liu... and 5 others

    - Year 2022

    Concern for the quasi-static response of ship and offshore structures, as required for safety and serviceability assessments. Attention shall be given to uncertainty quantification of quasi-static load and response analysis approaches, and their limitations, including exact and approximate methods for derivation of different acceptance criteria.

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

    - Materials - Year 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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  • Stress–strain model of lower corroded steel plates of normal strength for fitness-for-purpose analyses
    Publication

    This study investigates the mechanical properties of specimens made of normal strength steel subjected to lower marine immersed corrosion degradation levels (below 25 %). The specimens were corroded in laboratory conditions, and only natural factors were controlled to raise the corrosion rate (reaching the level of 1 mm/year). Three different thicknesses of plates made of normal strength of shipbuilding steel are investigated (between...

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Year 2021
  • Accelerated large scale test set-up design in natural corrosion marine environment
    Publication

    - Year 2021

    The standards for conducting small-scale specimen tests are well developed, but there is a lack of direct guidelines for conducting corrosion tests for large-scale specimens. The objective here is to develop a methodology which may be used in designing an accelerated corrosion test of large-scale structural components subjected to a natural corrosion marine environment. Different factors influencing corrosion degradation of steel...

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  • Indoor accelerated controlled corrosion degradation test of small- and large-scale specimens
    Publication

    - OCEAN ENGINEERING - Year 2021

    The work presented here is a part of a long-term project analysing the structural behaviour of ageing marine structures. An accelerated corrosion degradation set-up was developed to reproduce corroded marine structural specimens of different degrees of degradation, controlling various natural factors, i.e., temperature, oxygen content, salinity, and flow velocity. The nine stiffened plates of 1.2 m length and 30 small scale specimens...

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  • SPECTRAL RESPONSE OF STATIONARY JACK-UP PLATFORMS LOADED BY SEA WAVES AND WIND USING PERTURBATION METHOD
    Publication

    - Polish Maritime Research - Year 2021

    The paper addresses non-linear vibrations of offshore jack-up drilling platforms loaded by sea waves and wind in their stationary condition using the perturbation method. Non-linearity of dynamic equations of motion for fixed offshore platforms yields from two factors. The first is load excitation generating non-linear velocity coupling in a dynamic system. This coupling is inherent in the modified Morison equation, involving the...

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  • Strength analysis of container ship subjected to torsional loading
    Publication

    The objective of this work is to investigate the torsional response of a container ship, with particular consideration of the warping effect. Two different models are investigated. In the first case, the full length model of a ship is analyzed and a distributed load is applied with the use of a novel approach. The model is supported in the torsional centre of the cross-section, which is derived analytically. In the second case,...

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  • Ultimate strength of stiffened plates subjected to compressive load and spatially distributed mechanical properties
    Publication

    - Year 2021

    The present study deals with the ultimate strength of stiffened plates subjected to spatially distributed mechanical properties and compressive load. Normally, mean values of mechanical properties based on tensile tests are used to validate the numerical assessment with experimental results. However, mechanical properties may vary within a single specimen. To investigate the impact of that, random fields of yield stress and Young...

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