Wyniki wyszukiwania dla: lamb wave

• Wave Frequency Effects on Damage Imaging in Adhesive Joints Using Lamb Waves and RMS

  Publikacja

  • E. Wojtczak
  • M. Rucka

  - Materials - Rok 2019

  Structural adhesive joints have numerous applications in many fields of industry. The gradual deterioration of adhesive material over time causes a possibility of unexpected failure and the need for non-destructive testing of existing joints. The Lamb wave propagation method is one of the most promising techniques for the damage identification of such connections. The aim of this study was experimental and numerical research on...

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• Lamb wave propagation in a single lap adhesive joint

  Publikacja

  • M. Rucka
  • J. Lachowicz
  • E. Wojtczak

  - Rok 2017

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• Lamb wave propagation in a single lap adhesive joint

  Publikacja

  • M. Rucka
  • J. Lachowicz
  • E. Wojtczak

  - Rok 2018

  The aim of the paper is the analysis of Lamb wave propagation in adhesive joints. The research was performed on a single lap adhesive joint of two steel plates. Two types of joints, namely an intact and with defect were considered. In experimental investigations the condition assessment of the joint was performed with the use of antisymmetric Lamb waves excited by a plate piezo actuators and measured by a laser vibrometer. Numeri-cal...

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• Damage Imaging in Lamb Wave-Based Inspection of Adhesive Joints

  Publikacja

  • M. Rucka
  • E. Wojtczak
  • J. Lachowicz

  - Applied Sciences-Basel - Rok 2018

  Adhesive bonding has become increasingly important in many industries. Non-destructive inspection of adhesive joints is essential for the condition assessment and maintenance of a structure containing such joints. The aim of this paper was the experimental investigation of the damage identification of a single lap adhesive joint of metal plate-like structures. Nine joints with different defects in the form of partial debonding...

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• Preload monitoring in a bolted joint using Lamb wave energy

  Publikacja

  • R. Kędra
  • M. Rucka

  - Bulletin of the Polish Academy of Sciences-Technical Sciences - Rok 2019

  The knowledge of the load in prestressed bolted connections is essential for the proper operation and safety of engineering structures. Recently, bolted joints have become an area of intensive research associated with non-destructive diagnostics, in particular in the context of wave propagation techniques. In this paper, a novel procedure of bolt load estimation based on the energy of Lamb wave signals was proposed. Experimental...

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• Numerical Study of Concrete Mesostructure Effect on Lamb Wave Propagation

  Publikacja

  • B. Zima
  • R. Kędra

  - Materials - Rok 2020

  The article presents the results of the numerical investigation of Lamb wave propagation in concrete plates while taking into account the complex concrete mesostructure. Several concrete models with randomly distributed aggregates were generated with the use of the Monte Carlo method. The influence of aggregate ratio and particle size on dispersion curves representing Lamb wave modes was analyzed. The results obtained for heterogeneous...

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• Detection of debonding in adhesive joints using Lamb wave propagation

  Publikacja

  • M. Rucka
  • E. Wojtczak
  • J. Lachowicz

  - MATEC Web of Conferences - Rok 2019

  Adhesively bonded joints are widely used in many branches of industry. Mechanical degradation of this type of connections does not have significant symptoms that can be noticed during visual assessment, so non-destructive testing becomes a very important issue. The paper deals with experimental investigations of adhesively bonded steel plates with different defects. Five samples (an intact one and four with damages in the form...

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• Lamb Wave Based Structural Damage Detection Using Stationarity Tests

  Publikacja

  • P. Dao
  • W. Staszewski
  • P. B. Dao

  - Materials - Rok 2021

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• Lamb wave-based monitoring of shear failure of an adhesive lap joint

  Publikacja

  • M. Rucka
  • E. Wojtczak
  • J. Lachowicz

  - Diagnostyka - Rok 2018

  The paper presents a study on the elastic wave propagation in adhesive joints of steel plates subjected to tensile loading. A single lap joint was chosen for analysis because of its simplicity and plurality of applications. Experimental investigations consisted of the uniaxial extension of prepared specimens. Force and displacement values were recorded by a testing machine. Simultaneously, guided Lamb waves were excited and signals...

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• Identification of discontinuites in composite rods and beams based on Lamb wave propagation

  Publikacja

  • J. Grabowska
  • M. Krawczuk

  - Rok 2005

  W pracy omówiono metodę identyfikacji typu nieciągłości w belkach i prętach kompozytowych, oparta o analizę zmain w propagacji fali Lamba.

• Cointegration approach for temperature effect compensation in Lamb-wave-based damage detection

  Publikacja

  • P. Dao
  • W. Staszewski
  • P. B. Dao

  - SMART MATERIALS & STRUCTURES - Rok 2013

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• Lamb wave based structural damage detection using cointegration and fractal signal processing

  Publikacja

  • P. Dao
  • W. Staszewski
  • P. B. Dao

  - Mechanical Systems and Signal Processing - Rok 2014

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• Cointegration and wavelet-analysis-based approach for Lamb-wave-based structural damage detection

  Publikacja

  • P. Dao
  • W. Staszewski
  • P. B. Dao

  - Rok 2013

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• Monitoring the curing process of epoxy adhesive using ultrasound and Lamb wave dispersion curves

  Publikacja

  • E. Wojtczak
  • M. Rucka

  - MECHANICAL SYSTEMS AND SIGNAL PROCESSING - Rok 2021

  Monitoring the stiffness of adhesives is a crucial issue when considering the durability andstrength of adhesive joints. While there are many studies conducted on specimens madeonly from adhesive, the problem of curing of an adhesive film in real joints is moderatelyconsidered. This paper presents the monitoring of stiffening of epoxy adhesive using ultra-sound. Ultrasonic pulse velocity method was firstly applied for monitoring...

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• Deep learning approach for delamination identification using animation of Lamb waves

  Publikacja

  • S. Ullah
  • A. Ijjeh
  • P. Kudela

  - Engineering Applications of Artificial Intelligence - Rok 2023

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• Deep learning super-resolution for the reconstruction of full wavefield of Lamb waves

  Publikacja

  • A. Ijjeh
  • S. Ullah
  • M. Radzienski
  • P. Kudela

  - Mechanical Systems and Signal Processing - Rok 2023

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• Damage Detection Using Cointegration Technique and Wavelet Analysis of the Post-Cointegrated Lamb Waves

  Publikacja

  • P. Dao
  • W. Staszewski
  • P. B. Dao

  - Key Engineering Materials - Rok 2013

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• Imaging of Increasing Damage in Steel Plates Using Lamb Waves and Ultrasound Computed Tomography

  Publikacja

  • M. Zielińska
  • M. Rucka

  - Materials - Rok 2021

  This paper concerns inspection of steel plates, with particular emphasis on the assessment of in-creasing damage. Non-destructive tests were performed on four plates, one of which was un-damaged, while the remaining three had a defects in the form of circular holes with a diameter of 2, 5, and 10 cm. Guided Lamb waves were used in the research, and the image reconstruction was performed using ultrasound computed tomography. The...

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• Extreme waves and wave events in the Baltic Sea

  Publikacja

  • M. Paprota
  • J. Przewłócki
  • W. Sulisz
  • B. Swerpel

  - Rok 2003

  W pracy przedstawiono wyniki pomiarów szeregów czasowych falowania uzyskanych z boi pomiarowych, umieszczonych w kilku miejscach linii brzegowej Morza Bałtyckiego. Rozważano wpływ czasu trwania sztormu i kierunku wiatru na powstawanie pojedynczych oraz grup fal ekstremalnych. Przeprowadzono statystyczną analizę takich fal, zwracając szczególną uwagę na rozkłady ich wysokości. Dla wybranych realizacji przeprowadzono analizę spektralną...

• Data normalisation for Lamb wave–based damage detection using cointegration: A case study with single- and multiple-temperature trends

  Publikacja

  • P. Dao
  • W. Staszewski
  • P. B. Dao

  - JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES - Rok 2014

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• Monitoring Steel Bolted Joints during a Monotonic Tensile Test Using Linear and Nonlinear Lamb Wave Methods: A Feasibility Study

  Publikacja

  • M. Rucka

  - Metals - Rok 2018

  The structural integrity of steel bolted joints may be compromised due to excessive loading. Therefore, condition assessment and the detection of potential defects before they cause a failure have become a major issue. The paper is focused on the condition monitoring of a bolted lap joint subjected to progressive degradation in a tensile test. The inspection used Lamb waves propagated through the overlap area. Wave propagation...

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• WAVE MOTION

  Czasopisma

  ISSN: 0165-2125 , eISSN: 1878-433X

• Charles Lamb Bulletin

  Czasopisma

  ISSN: 0308-0951

• Waves Along Fractal Coastlines: From Fractal Arithmetic to Wave Equations

  Publikacja

  • M. Czachor

  - ACTA PHYSICA POLONICA B - Rok 2019

  Beginning with addition and multiplication intrinsic to a Koch-type curve, we formulate and solve wave equation describing wave propagation along a fractal coastline. As opposed to examples known from the literature, we do not replace the fractal by the continuum in which it is embedded. This seems to be the first example of a truly intrinsic description of wave propagation along a fractal curve. The theory is relativistically...

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• Nonlinear Excitation of the Non-Wave Perturbations by the Magnetoacoustic Waves in the Non-Isentropic Plasma

  Publikacja

  • A. Perelomova

  - Archives of Acoustics - Rok 2018

  Nonlinear excitation of slow modes by the planar magnetosonic perturbations in a plasma is discussed. Plasma is an open system due to radiation and external heating. This may stipulate enhancement of wave perturbations and hence the acoustical activity of plasma. Plasma is assumed to be a homogeneous ideal gas with infinite electrical conductivity. The straight magnetic field is orthogonal to the velocity of fluid’s...

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• Physics of Wave Phenomena

  Czasopisma

  ISSN: 1541-308X , eISSN: 1934-807X

• Damage detection in plates based on Lamb wavefront shape reconstruction

  Publikacja

  • B. Zima

  - 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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• Three-dimensional structure of wave-induced momentum flux in irrotational waves in combined shoaling-refraction conditions

  Publikacja

  • A. Herman

  - COASTAL ENGINEERING - Rok 2006

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• JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS

  Czasopisma

  ISSN: 0920-5071 , eISSN: 1569-3937

• Limb/Ground Impacts and Unexpected Impacts Control Strategy for a Model of a Limb of a Walking Robot

  Publikacja

  • K. Lipiński

  - Solid State Phenomena - Rok 2010

  Praca prezentuje wyniki analizy numerycznej dynamiki robota kroczącego. Uwaga skoncentrowana jest na zagadnieniu kontaktu odnóża z podłożem. W kierunku normalnym kontakt opisano więzami jednostronnymi. W kierunku stycznym, założono obecność poślizgu i tarcia. Z uwagi na jednostronność kontaktu, może się on rozpocząć z niezerową prędkością względną. Z chwila rozpoczęcia kontaktu, prędkości zmieniają się gwałtownie. Towarzysza temu...

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• Crack monitoring in concrete beams under bending using ultrasonic waves and coda wave interferometry: the effect of excitation frequency on coda

  Publikacja

  • M. Knak
  • E. Wojtczak
  • M. Rucka

  - Rok 2024

  Concrete is one of the most widely used construction materials in the world. In recent years, various non-destructive testing (NDT) and structural health monitoring (SHM) techniques have been investigated to improve the safety and control of the current condition of concrete structures. This study focuses on micro-crack monitoring in concrete beams. The experimental analysis was carried out on concrete elements subjected to three-point...

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• AMB Express

  Czasopisma

  ISSN: 2191-0855

• Offal Chemical Composition from Veal, Beef, and Lamb Maintained in Organic Production Systems

  Publikacja

  • W. Biel
  • E. Czerniawska-Piątkowska
  • A. Kowalczyk

  - Animals - Rok 2019

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• Orthodontic Waves

  Czasopisma

  ISSN: 1344-0241 , eISSN: 1878-1837

• Water Waves

  Czasopisma

  ISSN: 2523-367X , eISSN: 2523-3688

• SHOCK WAVES

  Czasopisma

  ISSN: 0938-1287 , eISSN: 1432-2153

• Isotropic s -wave superconductivity in the noncentrosymmetric charge density wave superconductor SrPt2As2

  Publikacja

  • R. Gupta
  • C. Löhnert
  • C. Wang
  • D. Johrendt
  • H. Luetkens
  • S. Malick
  • T. Shiroka
  • Z. Hossain
  • R. Khasanov

  - PHYSICAL REVIEW B - Rok 2020

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• Lamp of adjustable spectrum for photographic usage

  Publikacja

  • A. Mazikowski
  • M. Feldzensztajn

  - Rok 2017

  Photography is a unique rapidly growing interdisciplinary field encompassing aspects of science, art and technology. Expectations of photographers are steadily increasing with the development of technology. One of the areas playing a crucial role in photography is lighting. Consequently, several types of light sources for photographic use have been developed. The ongoing research in this field concentrates on lamps with tunable...

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• Analyses of wave records from the Southern Baltic Sea with the emphases on large wave events

  Publikacja

  • B. Paplińska-Swerpel
  • M. Paprota
  • J. Przewłócki
  • W. Sulisz

  - Rok 2005

  W pracy przedstawiono wyniki analizy pomiarów szeregów czasowych falowania uzyskanych z boi pomiarowych Waverider, umieszczonych w kilku miejscach linii brzegowej Morza Bałtyckiego. Celem badań było wskazanie okresów i regionów możliwego pojawiania się fal maksymalnych. Rozważano wpływ czasu trwania sztormu i kierunku wiatru na powstawanie pojedynczych oraz grup fal ekstremalnych.

• A sine wave delay estimator

  Publikacja

  • E. Hermanowicz
  • M. Rojewski

  - Rok 2009

  Zaprezentowano nowe rozwiązanie dyskretno-czasowego estymatora ułamkowego opóźnienia sygnału sinusoidalnego, działające w systemie z otwartą pętlą sprzężenia zwrotnego. Proponowane rozwiązanie wykorzystuje koncepcję transformowania za pomocą filtru Hilberta sygnału referencyjnego celem estymacji różnicy fazy tego sygnału względem zaszumionego sygnału odebranego o znormalizowanej (względem okresu próbkowania) częstotliwości - bardzo...

• Wave propagation in delaminated beam

  Publikacja

  • W. Ostachowicz
  • M. Krawczuk
  • M. Cartmell
  • M. Gilchrist

  - COMPUTERS & STRUCTURES - Rok 2004

  W pracy przedstawiono model oraz wyniki analizy propagacji fali sprezystejw belce z delaminacją.

• IEEE Microwave and Guided Wave Letters

  Czasopisma

  ISSN: 1051-8207

• The description of non-linear interactions of wave and non-wave modes in a non-adiabatic plasma flow

  Publikacja

  • A. Perelomova

  - CONTRIBUTIONS TO PLASMA PHYSICS - Rok 2021

  The method of derivation of non-linear equations for interacting modes is explained and applied to a plasma's flow affected by a magnetic field. It is based on the linear projecting of the total perturbation field into specific variations of variables in individual modes of a flow. The method may be applied in many examples of fluid flows with different mechanisms of non-adiabaticity. It is of special importance in complex flows...

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• Approach for Determination of Functioning of Lower Limb Muscles

  Publikacja

  • W. Wojnicz
  • B. Zagrodny
  • M. Ludwicki
  • M. Syczewska
  • J. Mrozowski
  • J. Awrejcewicz

  - Rok 2018

  The purpose of the study is elaboration of approach for determination of functioning of chosen muscles that are essential for gait performance (Tibialis Anterior, Rectus Femoris, Gastrocnemius Medialis, Biceps Femoris). The scope of the study involves the analysis of the symmetric planar motion performing in the sagittal plane of the body by applying planar multibody model and electromyography signals (EMG) registered over normal...

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• Modelling of planar movement dynamics of upper limb

  Publikacja

  • W. Wojnicz
  • E. Wittbrodt

  - Rok 2013

  The original model describing planar movement dynamics of upper limb is presented. The upper limb is modelled as two-joints system loaded by external forces and internal forces of striated skeletal muscles. A behaviour of each muscle is modelled as a system composed of serially linked rheologic fragments that have different mechanical properties. These muscle models allow us to simulate a behaviour of short fusiform muscle (3DOF...

• Mentor & Student Reserch Lab

  Publikacja

  • H. Obracht-Prondzyńska

  - Przegląd Urbanistyczny - Rok 2015

  Relacja z realizacji projektów badawczych przygotowanych w ramach Mentor&Student Research Lab - Urban Transformations 2014

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• Wave-induced stress and breaking of sea ice in a coupled hydrodynamic discrete-element wave–ice model

  Publikacja

  • A. Herman

  - The Cryosphere - Rok 2017

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• Measuring research on radio wave propagation

  Publikacja

  • S. J. Ambroziak

  - Rok 2010

  Telecommunication connections are increasingly based on the wireless links, both fixed and mobile, carried out under different radio systems. This kind of solution has many advantages. However, the propagation medium is a factor that causes many difficulties in designing wireless networks, because of large diversity of propagation environments. Transmission loss in each environment is determined by many variables phenomena and...

• Scalar- and vector-source wave equations

  Publikacja

  • H. Lasota

  - Rok 2009

  W analizie zjawisk akustyki liniowej i obliczeniach pola, powszechnie stosowane są równania falowe skalarne dotyczące ciśnienia akustycznego lub potencjału prędkości, natomiast rzadko są choćby tylko wspominane równania wektorowe operujące prędkością cząstek. Jest to przejaw asymetrii w traktowaniu skalarnych i wektorowych wielkości akustycznych. Artykuł przypomina dwa zestawy dualnych równań falowych, jednorodnych i niejednorodnych,...

• Catamaran dynamics at irregular wave excitations

  Publikacja

  • A. Królicka-Gałązka

  - Marine Technology Transactions. Technika Morska - Rok 2008

  Artykuł dotyczy dynamiki jednostki wielokadłubowej typu katamaran poddanej wymuszeniom pochodzącym od falowania nieregularnego.Przeprowadzono analizę dynamiki jednostki wielokadłubowej przy założeniu, że jest on opisany jako model liniowy, na który działa fala nieregularna. Model matematyczny układu dynamicznego jest reprezentowany poprzez równania stanu. Zapisano równania uwzględniające napływ fali czołowej, która wywołuje ruchy...