Roman Szewczyk

Roman Szewczyk
Warsaw University of Technology · Institute of Metrology and Biomedical Engineering

Professor

About

295
Publications
44,477
Reads
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1,375
Citations
Introduction
Soft magnetic materials, inductive components, magnetic measurements, fluxgates, magnetoelastic effects, Jiles-Atherton model, magnetostriction, sensors, technological foresight. Author of open-source Jiles-Atherton model implementation for MATLAB / OCTAVE https://www.github.com/romanszewczyk/JAmodel/

Publications

Publications (295)
Article
Full-text available
This paper presents a novel finite element method (FEM) of optimization for driving frequency in magneto-mechanical systems using contactless magnetoelastic torque sensors. The optimization technique is based on the generalization of the axial and shear stress dependence of the magnetic permeability tensor. This generalization creates a new possibi...
Article
Full-text available
Microwave technology is widely used in different areas of advanced industry when energy must be provided to water-containing and other materials. The main barrier in the development of microwave devices is the possibility of efficient design by modelling a microwave system in a resonant state. For technical systems, the finite element method is wid...
Article
Full-text available
This paper presents a methodology of inverse tomography transformation in eddy current tomography with the use of continuous optimization of reference defect parameters. Ferromagnetic steel samples with rectangular air inclusion defects of known dimensions were prepared and measured using an eddy current tomography setup. FEM-based (Finite Element...
Article
Full-text available
In this work, simulations of friction at the atomic level were performed to evaluate the influence of inclusions coming from metallic nanoadditives in the friction pair. The simple 2D model was applied considering appropriate values of Lennard–Jones potential parameters for given sets of interacting atoms. The real sliding pairs were replaced by ef...
Chapter
Modelling the transient simulation of magnetic circuits is the crucial process for development of modern switching mode power converters. Such models are especially important for newly developed magnetic materials, such as amorphous alloys. Paper presents the gyrator-capacitor model of inductive element with core made of high permeability, Co-based...
Chapter
Determination of parameters of anhysteretic magnetization curve plays the key role in modelling the characteristics of soft magnetic materials. This curve can be efficiently used to describe the characteristics of inductive components in SPICE or FEM modelling. Moreover, anhysteretic magnetization curve is the base of Jiles-Atherton model of magnet...
Book
This book includes the outcomes of the 59th Symposium “Modelowanie w Mechanice” (Engineering Modelling in Mechanics) held in Ustroń from 22 February to 26 February 2020. The International Conference has an over 58-year-old history and is organized by the Department of Theoretical and Applied Mechanics of Silesian University of Technology under the...
Book
This book contains 38 papers authored by both scientists and practitioners focused on an interdisciplinary approach to the development of cyber-physical systems. Recently our civilization has been facing one of the most severe challenges in modern history. The COVID-19 pandemic devastated the global economy and significantly disrupted numerous area...
Article
Full-text available
This paper presents a new solution enabling modeling of the mechanical stress tensor dependence of the 3D relative permeability tensor of isotropic material only on the basis of knowledge of the axial stress dependence characteristics. For the proposed model, the concept of principal stresses is utilized. In such a case, the sophisticated system of...
Article
Frame-shaped samples method is commonly used for testing the magnetoelastic characteristics of bulk soft magnetic materials, such as ferrites or steels. However, unusual shape of such samples limits the accuracy of estimation of magnetic path length as well as efficient magnetic cross-section of the samples carried out accordingly to the IEC 60205:...
Article
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The results of optimizing the parameters of Co-based ribbons with different chemical composition are presented.The motivation for these studies is the construction of weak magnetic field sensors. The annealed ribbons showlarge impedance changes for saturating external magnetic field, and very large impedance change in the regionof weak field. The h...
Chapter
During the development of advanced models of mechatronics devices with cores made of anisotropic soft magnetic materials, magnetic permeability has to be described as tensor. However commonly used tensor magnetic permeability descriptions doesn’t consider saturation phenomenon for flux density. As a result accuracy of such simulations is significan...
Chapter
Anhysteretic magnetization curve plays the key role in modelling the characteristics of components made of soft magnetic materials. However, due to the positive feedback, for some set of parameters the most common model of magnetization curve might be unstable. Moreover, formal stability assessment of anhysteretic magnetization curve is sophisticat...
Article
Full-text available
The idea, design, and tests of the novel GMI sensor are presented, based on the compensation measurement principle, where the local ‘zero-field’ minimum of the double-peak characteristic was utilized as a sensitive null detector. The compensation field was applied in real-time with the help of microprocessor-based, two-step, quasi-Newtonian optimiz...
Article
Full-text available
Magnetoelastic force sensors exhibit high sensitivity and robustness. One commonly used configuration of force sensor with a ring-shaped core was presented by Mohri at al. In this configuration force is applied in the direction of a diameter of the core. However, due to inhomogeneous distribution of stresses, model of such sensor has not been prese...
Chapter
Paper presents the results of verification of the explicitness of determination of parameters for anhysteretic loop in Jiles-Atherton model of magnetic characteristics of strongly anisotropic material. For the experiments the VitroVac 6150F, cobalt-based amorphous alloy with strong perpendicular anisotropy was used. The results indicated, that anhy...
Chapter
Calculation of distribution of flux density in the constructional elements is required in non-destructive testing. Paper presents the simplified method of calculation of flux density distribution in H-bar based on the generalization of the method of moments. In opposite to finite elements method, the method of moments doesn’t require to solve ill-p...
Chapter
The paper presents the Internet of Things based concept of the universal system of agricultural production management and control accordingly to INDUSTRY 4.0 concept. Proposed system will be implemented in test sites in Poland and Israel and will cover four layers: decision support, data processing, data acquisition and transmission and sensors. Th...
Chapter
The purpose of the study is to compute an approached satellite thermal model to be able to estimate the heat transfer and the minimum temperature through harmonic gear for small size geostationary satellite in cold condition. We will use finite element method using known data with Nastran In-CAD FEM software. The presented results show temperature...
Chapter
Paper presents the application of anhysteretic curve concept presented in Jiles-Atherton model of magnetic materials for modelling of stress dependence of magnetic permeability. Due to connection of average anisotropy energy density with mechanical stresses, the anisotropic characteristic of relative permeability can be estimated. Presented solutio...
Book
This book gathers papers presented at Mechatronics 2019, an international conference held in Warsaw, Poland, from September 16 to 18, 2019. The contributions discuss the numerous, multidisciplinary technological advances in the field of applied mechatronics that the emerging Industry 4.0 has already yielded. Each chapter presents a particular examp...
Book
This book presents the scientific outcomes of the International Conference AUTOMATION 2020, held on March 18–20, 2020 in Warsaw, Poland. The next 30 years will see radical innovations in production processes, transportation management and social life. The changes brought about by the transformation to zero-emission industry require advances in many...
Article
Full-text available
This paper presents a new method of modeling the influence of mechanical stresses on a magnetic permeability tensor of soft magnetic materials. The proposed method utilizes the principal stresses concept to compensate the influence of shear stresses. As a result, the stress dependence of a magnetic permeability tensor may be assessed with only the...
Conference Paper
Fluxgate sensors are known for being cheap, robust and sensitive magnetic field sensors. Presented sensor uses Matteucci effect (ME) in its principle of magnetic field sensing, while using harmonic voltage signal extraction typical for fluxgate sensors. In order to increase the sensitivity of used sensor, investigation of high order harmonic of sig...
Conference Paper
Paper presents the review of recent advances in development of Jiles-Atherton model. Solutions of anhysteretic curve considering uniaxial and grain-oriented anisotropy are presented. Moreover, different concepts of differential equations stating magnetic hysteresis are explained. Finally, problems connected with solving ordinary differential equati...
Article
Full-text available
The significant strain dependence of the hysteretic Giant Magnetoimpedance (GMI) effect in a Co67Fe3Cr3B12Si15 amorphous alloy in a low magnetizing field is presented. A simplistic test stand capable of continuous measurements of GMI characteristics under the influence of strain is detailed. Based on the results, a stress-impedance (SI) sensor is p...
Article
Full-text available
The present paper presents a new model of magnetostrictive hysteresis loop. A unified approach of both the hysteresis of λ(B) relation, as well as the lift-off phenomenon is proposed, which are explained together on the base of the response of the first order inertial element. Considering previously presented reports, the Maxwell–Boltzmann distribu...
Article
Full-text available
The anhysteretic magnetization curve is the key element of modeling magnetic hysteresis loops. Despite the fact that it is intensively exploited, known models of anhysteretic curve have not been verified experimentally. This paper presents the validation of four anhysteretic curve models considering four different materials, including isotropic, su...
Article
The paper presents the Internet of Things based concept of the universal system of agricultural production management and control accordingly to INDUSTRY 4.0 concept. Proposed system will be implemented in test sites in Poland and Israel and will cover four layers: decision support, data processing, data acquisition and transmission and sensors. Th...
Article
Full-text available
The Matteucci effect (ME) is one of the lesser-known magnetomechanical effects and is most prominent in bistable amorphous wires. It has some experimental applications—Matteucci effect-based magnetic field sensors are very easy to produce and have inherently linear, hybrid analog/digital output signal. The effect is still poorly understood, however...
Article
Full-text available
This article is concerned with the localization of ferromagnetic objects on the basis of magnetovision measurement analysis. In the presented case, the concept of localization is understood as the indication of the x, y, and z coordinates of the magnetic moment of the sought object. Magnetovision measurement provides a much simpler, two-dimensional...
Article
Full-text available
The SI (stress-impedance) effect in amorphous ribbons with varying magnetostriction was investigated. Iron- and cobalt-based ribbons with different magnetostriction coefficients were put under tensile stress in a dead weight tester and the impedance change was investigated in function of applied stresses. Significant differences of characteristics...
Chapter
The article presents evaluation of newly developed microwave moisture analyzer for moisture content measurements, for drying and heating applications. This microwave device operates at 2.45 GHz and consists of waveguide line and resonant chamber optimized with the use of microwave simulation software. The work presents results of tests of developed...
Article
Full-text available
This paper presents a model of the magnetostrictive hysteresis loop with local maximum. The model is based on the differential equations describing magnetostriction due to the domain wall movement as well as domain magnetization rotation. The transition between these mechanisms of magnetization is quantified by the Maxwell–Boltzmann distribution. M...
Article
Conductive graphene electrode of large area is required for some applications like for example photovoltaics or touch screens. Such large area graphene membrane needs specific test methods to assess defects which may obstacle its performance. In this work the infrared imaging of Joule heated graphene was proposed to estimate its uniformity and mech...
Article
This paper presents a mobile ferrograph system for measurement of magnetic parameters of ultrahigh permeability alloys. The structure of developed system is described, as well as exemplary measurement results of Co67Fe3Cr3B12Si15 alloy used in space applications are presented. © 2018, Industrial Research Institute for Automation and Measurements. A...
Chapter
In this paper we present the web-service development for water level visualization in WebGL technology, which was one of the solution proposed to be used for flood management in C2-SENSE project. The paper investigates the various technologies for visualization in different environments (groundwater, surface water, different water flow regimes and...
Article
Full-text available
This paper presents recent progress in the development of the new type of Hall-effect sensor with the graphene layer acting as sensing material. Newly developed Hall-effect sensor is made of quasi-free-standing bilayer graphene structure. The graphene structure is placed inside the standard QFN-32 package for integrated circuits and mounted on the...
Article
Full-text available
This paper presents investigation results regarding the Jiles-Atherton-based hysteresis loop modeling of ultra-high permeability amorphous alloy MELTA® MM-5Co. The measurement stand is capable of accurately measuring minor and major hysteresis loops for such a material together with exemplary measurement results. The main source of the measurement...
Article
Full-text available
This paper presents the results of measurements of magnetostrictive properties of Mn0.70Zn0.24Fe2.06O4 ferrite for power applications. Frame-shaped samples were used for measurements to guarantee a uniform magnetizing field and magnetostrictive strain distribution. Magnetostrictive hysteresis loops were measured by semiconductor strain gauges. The...
Conference Paper
The paper presents the comparative study of Giant Magneto Impedance (GMI) effect in amorphous ribbons of different composition. In paper fundamental aspects of GMI effect, designed measuring stand and obtained results were described. Ribbons with dimension: 1 mm wide, 50 mm long, 22 µm thick in as-cast state, have been investigated with exciting fr...
Conference Paper
DC magnetic field sensor similar to fluxgates utilizing Matteucci Effect was proposed previously. As these types of sensors depend on measuring the second harmonic of the signal, a spectral analysis of Matteucci effect signal was measured. Results indicate that each harmonic is periodical with the increase of DC magnetic field and the period decrea...
Conference Paper
Full-text available
Paper presents analysis of sensitivity of parameters of Jiles-Atherton model determined during the optimization process. Recently implemented, differential evolution based method together with two-step optimization process proved, that parameters of Jiles-Atherton model can be determined in reasonable time. However, paper indicates, that in the cas...
Chapter
Chapter presents the principles of finite elements method as well as limitation of this method from the point of view of modelling the thin layers. Methods of meshing, solving the differential equations and visualization of results are discussed. Possibility of the use of open source software for these processes is discussed. Finally, the advantage...
Chapter
This chapter presents the analyse of 1D, 2D and 3D systems from the point of view of the method of moments. The sets of equations for modelling of each case are elaborated. Special stress was made on the generalized description of thin layer systems, modelled as 2D systems. Chapter presents also the consideration of nonlinearity in magnetization p...
Chapter
Chapter presents the final remarks and conclusions considering the numerical analyses and tools presented in the book.
Chapter
Chapter presents the results of practical application of proposed generalization of the method of moments for thin layers. Examples are elaborated for the optimisation of the shape of a core for ring-shaped fluxgate sensor as well as of modelling the thin layer magnetic concentrator. Optimal proportions of the ring-shaped core of fluxgate sensor ar...
Chapter
This chapter presents the description of materials from the point of view of their magnetic properties. Physical principles of mechanisms of magnetization of ferromagnetic magnetic materials, covering domain wall bending, domain wall movements and domains rotations are elaborated. Moreover, chapter presents the most useful models of magnetisation p...
Chapter
This chapter presents the most common thin-layer devices, such as fluxgate magnetic field sensors, magnetic concentrators as well as naval vessels hulls. Principles of operation of fluxgate sensors in different configurations (Vacquier, Foerster, ring-core) are discussed. Moreover the idea of magnetic concentrator, based on the thin layer material,...
Article
Full-text available
The paper presents automatic and modular measurement station for the magnetic materials testing. It allows for measurements of magnetic hysteresis loops under various regimes (sine, triangle or arbitrary magnetizing field, sine or triangle magnetic flux density) and relative permeability curves. The modular nature of the system allows for measureme...
Article
Full-text available
The following paper presents the original results of investigation on the magnetoelastic properties of ferrite materials magnetized in low field region, which could be utilized in development of force and stress sensors. The objects of investigation were two ferrite materials (manganese–zinc Mn–Zn and nickel–zinc Ni–Zn). The magnetoelastic characte...
Article
Full-text available
Paper presents utilized innovative setup for eddy current tomography and possibility of its utilization in testing oxide materials such as ferrites. Previously reported tests concerned materials with high conductivity which is the most typical usage of eddy current tests. Described tomography setup is designed for testing axisymmetric objects thus...
Chapter
Full-text available
The following paper presents the idea of distinguishing ferromagnetic objects based on their magnetic signature. This method is based on the measurement of the magnetic moment of the samples. The developed method could be attractive to the industry due to its simplicity, scalability and low implementation costs. The paper presents detailed descript...
Chapter
Full-text available
The paper presents utilization of open-source finite element method (FEM) software for modelling of measurement process on eddy current tomography setup. Methodology of measurements is presented, as well as software for forward tomography transformation. Developed software was based entirely on the open-source programs, which results in a high poss...
Chapter
Full-text available
The main objective of this project was the development of fully functional microprocessor controlled thermoelectric ammeter for laboratory and didactic purposes. Device is based on analog thermoammeter transducer, Kamduino platform and thermocouple transducer with cold junction temperature compensation. The main advantage of this unit is direct mea...
Article
Full-text available
Full Text PDF Paper presents results of a discrete inverse tomography transformation on exemplary results from eddy current tomography setup. Eddy current phenomena is highly non-linear and measurement results are ill-posed function of distribution of physical properties of the matter (mostly electrical conductivity and magnetic permeability). Thus...
Article
Full-text available
The following paper presents the results of investigation on the magnetoelastic Villari effect in structural steel magnetized in the so-called Rayleigh region, which corresponds to relatively low magnetizing fields, much lower than coercive field. Two grades of structural steel were investigated during the performed measurements. Obtained results i...
Conference Paper
Full-text available
The aim of this study was to prepare a computer simulation of four selected systems for magnetic field tomography. The first three contain four, six and eight magnets arranged concentrically around a rotating cylinder with a hole. The subject of the last simulation is a pair of magnets, between which the tested object is moving. In this case, the o...
Conference Paper
Full-text available
The following paper presents the original results of investigation on the Fe78B13Si9 amorphous alloy and its magnetic properties in low magnetizing fields known as Rayleigh region. The Rayleigh region is the first part of the initial magnetization curve, where magnetic B-H characteristic of the material could be approximated with second degree poly...
Book
This book presents recent research advances on achieving seamless interoperability across all layers of communication channels in the context of emergency management and crisis response. It includes the outcomes of intensive discussions during the Workshop “Command, Control and Sensor Systems in Emergency Management” (EU C2-SENSE), which was held i...
Article
Full-text available
The samples of Leznikovskyi granite deposit from different parts of the quarry were exposed to pull and compression test. The test findings showed that the samples do not only have different shades of red but also mechanical properties. The unloaded ultrasound examination of samples was also performed. 31 rock samples were exposed to compression te...
Article
The method of moments enables effective magnetostatic modelling of thin lay- ers, where thickness of the layer should be considered. This paper presents the non-linear extension for this method of modelling. An initial magnetization curve, necessary for mod- elling, was reconstructed from saturation hysteresis loops on the basis of the Jiles-Athert...
Book
This book presents an efficient and robust method of modelling the magnetostatic properties of different technical elements, especially thin layers for magnetic sensors. The solutions presented utilise the principles of the method of moments. However, the principles have been developed both from the point of view of physical analyses as well as fro...