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Wyniki wyszukiwania dla: GURTIN-MURDOCH APPROACH

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Wyniki wyszukiwania dla: GURTIN-MURDOCH APPROACH

  • On Nonlinear Dynamic Theory of Thin Plates with Surface Stresses

    Publikacja

    - Rok 2019

    We discuss the modelling of dynamics of thin plates considering surface stresses according to Gurtin–Murdoch surface elasticity. Taking into account the surface mass density we derive the two-dimensional (2D) equations of motion. For the reduction of the three-dimensional (3D) motion equations to the 2D ones we use the trough-the-thickness integration procedure. As a result, the 2D dynamic parameters of the plate depend not only...

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  • Bending of a Three-Layered Plate with Surface Stresses

    Publikacja

    - Rok 2018

    We discuss here the bending deformations of a three-layered plate taking into account surface and interfacial stresses. The first-order shear deformation plate theory and the Gurtin-Murdoch model of surface stresses will be considered and the formulae for stiffness parameters of the plate are derived. Their dependence on surface elastic moduli will be analyzed.

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  • Transverse surface waves on a cylindrical surface with coating

    Publikacja

    We discuss the propagation of transverse surface waves that are so-called whispering-gallery waves along a surface of an elastic cylinder with coating. The coating is modelled in the framework of linearized Gurtin–Murdoch surface elasticity. Other interpretations of the surface shear modulus are given and relations to so-called stiff interface and stiff skin model are discussed. The dispersion relations are obtained and analyzed.

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  • Anti-plane waves in an elastic thin strip with surface energy

    We consider anti-plane motions of an elastic plate taking into account surface energy within the linear Gurtin–Murdoch surface elasticity. Two boundary-value problems are considered that describe complete shear dynamics of a plate with free faces or with free and clamped faces, respectively. These problems correspond to anti-plane dynamics of an elastic film perfectly or non-perfectly attached to a rigid substrate. Detailed analysis...

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  • On stress singularity near the tip of a crack with surface stresses

    Publikacja

    - INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE - Rok 2020

    In the framework of the simplified linear Gurtin–Murdoch surface elasticity we discuss a singularity of stresses and displacements in the vicinity of a mode III crack. We show that inhomogeneity in surface elastic properties may significantly affect the solution and to change the order of singularity. We also demonstrate that implicitly or explicitly assumed symmetry of the problem may also lead to changes in solutions. Considering...

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  • Comparison of anti-plane surface waves in strain-gradient materials and materials with surface stresses

    Publikacja

    - MATHEMATICS AND MECHANICS OF SOLIDS - Rok 2019

    Here we discuss the similarities and differences in anti-plane surface wave propagation in an elastic half-space within the framework of the theories of Gurtin–Murdoch surface elasticity and Toupin–Mindlin strain-gradient elasticity. The qualitative behaviour of the dispersion curves and the decay of the obtained solutions are quite similar. On the other hand, we show that the solutions relating to the surface elasticity model...

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  • Wave transmission across surface interfaces in lattice structures

    Publikacja

    Within the lattice dynamics formulation, we present an exact solution for anti-plane surface waves in a square lattice strip with a surface row of material particles of two types separated by a linear interface. The considered problem is a discrete analog of an elastic half-space with surface stresses modelled through the simplified Gurtin–Murdoch model, where we have an interfacial line separating areas with different surface...

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  • On the Equations of the Surface Elasticity Model Based on the Theory of Polymeric Brushes

    Publikacja
    • R. Gerasimov
    • T. Petrova
    • V. Eremeev
    • A. Maximov
    • O. Maximova

    - Rok 2019

    Motivating by theory of polymers, in particular, by the models of polymeric brushes we present here the homogenized (continual) two-dimensional (2D) model of surface elasticity. A polymeric brush consists of an system of almost aligned rigid polymeric chains. The interaction between chain links are described through Stockmayer potential, which take into account also dipole-dipole interactions. The presented 2D model can be treated...

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  • On the influence of a surface roughness on propagation of anti-plane short-length localized waves in a medium with surface coating

    We discuss the propagation of localized surface waves in the framework of the linear Gurtin–Murdoch surface elasticity and taking into account a roughness of a free boundary. We derive a boundary-value problem for anti-plane motions with curvilinear boundary and surface stresses. Using the asymptotic technique developed earlier, we obtain the form of a localized wave and analyze its amplitude evolution. As the main result we present...

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  • Harmonic Vibrations of Nanosized Magnetoelectric Bodies with Coupled Surface and Interphase Effects: Mathematical Models and Finite Element Approaches

    Publikacja

    - Rok 2018

    The harmonic problems for piezomagnetoelectric nanosized bodies with taking into account the coupled damping and surface effects are considered on the base of the generalized Gurtin-Murdoch model. In the development of previous investigations, the coupled mechanical, electric and magnetic surface effects with surface inertial terms are introduced into the model. For a homogeneous model, the composite material is considered as homogeneous...

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  • Anti-plane surface waves in media with surface structure: Discrete vs. continuum model

    We present a comparison of the dispersion relations derived for anti-plane surface waves using the two distinct approaches of the surface elasticity vis-a-vis the lattice dynamics. We consider an elastic half-space with surface stresses described within the Gurtin–Murdoch model, and present a formulation of its discrete counterpart that is a square lattice half-plane with surface row of particles having mass and elastic bonds different...

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  • Surface and interfacial anti-plane waves in micropolar solids with surface energy

    Publikacja

    - MATHEMATICS AND MECHANICS OF SOLIDS - Rok 2021

    In this work, the propagation behaviour of a surface wave in a micropolar elastic half-space with surface strain and kinetic energies localized at the surface and the propagation behaviour of an interfacial anti-plane wave between two micropolar elastic half-spaces with interfacial strain and kinetic energies localized at the interface have been studied. The Gurtin–Murdoch model has been adopted for surface and interfacial elasticity....

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  • Anti-plane shear waves in an elastic strip rigidly attached to an elastic half-space

    We consider the anti-plane shear waves in a domain consisting of an infinite layer with a thin coating lying on an elastic half-space. The elastic properties of the coating, layer, and half-space are assumed to be different. On the free upper surface we assume the compatibility condition within the Gurtin–Murdoch surface elasticity, whereas at the plane interface we consider perfect contact. For this problem there exist two possible...

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  • Materials Science -- Classical Particle Approach (2022)

    Kursy Online
    • J. Dziedzic

    This is the course webpage for Materials Science -- Classical Particle Approach.

  • Social Welfare Interdisciplinary Approach

    Czasopisma

    ISSN: 2029-7424 , eISSN: 2424-3876

  • Sports Health-A Multidisciplinary Approach

    Czasopisma

    ISSN: 1941-7381 , eISSN: 1941-0921

  • SKULL BASE-AN INTERDISCIPLINARY APPROACH

    Czasopisma

    ISSN: 1531-5010

  • Materials science. Quantum particle approach. 2022.

    Kursy Online
    • M. Bobrowski

    quantum methods for materials and molecular modeling.

  • Material Science Quantum Particle Approach 2021

    Kursy Online
    • M. Bobrowski

    quantum methods for materials and molecular modeling.

  • International Journal of Psychology: A Biopsychosocial Approach

    Czasopisma

    ISSN: 1941-7233

  • System of innovation: a sectoral approach

    Publikacja

    - Rok 2009

    the article presents a systems approach to innovation as an alternative method of assessing the sector innovativeness. in the article the building blocks of each sectoral system of innovations (ssi) such as a knowledge base, institutions and actors are discussed. moreover, the five models of ssi are presented.

  • International Journal of Information Technologies and Systems Approach

    Czasopisma

    ISSN: 1935-570X , eISSN: 1935-5718

  • Adaptive Management Approach to an Infrastructure Project

    The paper presents an adaptive approach to project management, illustrated by the description of a case study, i.e., of a project whose aim was to develop the means and prepare the documentation for the revitalization of a railway line. The project itself was a major challenge for the implementers due to a novel and innovative subject thereof, including the construction of a railway line which takes place in a difficult terrain...

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  • Hybrid approach to ontology specification and development

    Publikacja

    In this chapter a first draft of a hybrid ontology development approach is presented. The context of this method encompasses the multi-agent system equipped with knowledge bases and inferring engine. The process of ontology engineering appears as a complex issue, as it addresses different point-views of both, a client and a modeler with a requirements/system analyst. Regarding this, an approach based on the knowledge preprocessing...

  • A Novel Approach to the Assessment of Cough Incidence

    Publikacja

    In this paper we consider the problem of identication of cough events in patients suffering from chronic respiratory diseases. The information about frequency of cough events is necessary to medical treatment. The proposed approach is based on bidirectional processing of a measured vibration signal - cough events are localized by combining the results of forward-time and backward-time analysis. The signal is at rst transformed...

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  • An Approach to Trust Case Development

    Publikacja

    In the paper we present an approach to the architectural trust case development for DRIVE, the IT infrastructure supporting the processes of drugs distribution and application. The objectives of DRIVE included safer and cheaper drugs distribution and application. A trust case represents an argument supporting the trustworthiness of the system. It is decomposed into claims that postulate some trust related properties. Claims differ...

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  • Safety-based approach in multifunctional building design

    Publikacja

    ABSTRACT: The modern trend in design of the public buildings is to create multifunctional environments in one building, hosting a variety of functions. Multifunctional buildings entertain large number of visitors. The complexity and vulnerability of this type of public space are the main reasons to use within their design process the performance based approach including the recognition of hazards. Safety and reliability approach...

  • Hybrid Approach to Networked Control System

    Publikacja

    - Rok 2013

    Effcient control of Networked Control System (NCS) is a challenge, as the control methods need to deal with non-deterministic variable delays and data loss. This paper presents a novel hybrid approach to NCS where Model Predictive Control (MPC) is applied as a main controller and implicit switching MPC is used for data transmission control in event-driven shared communication medium, leading to complex control system with active...

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  • Collaborative approach to WordNet and Wikipedia integration

    Publikacja

    In this article we present a collaborative approach tocreating mappings between WordNet and Wikipedia. Wikipediaarticles have been first matched with WordNet synsets in anautomatic way. Then such associations have been evaluated andcomplemented in a collaborative way using a web application.We describe algorithms used for creating automatic mappingsas well as a system for their collaborative development. Theoutcome enables further...

  • Agile Media Management Approach – an analysis

    This article studies media management and demonstrates a fresh perspective on the new approach based on agile methodologies of project management. The analysis sequentially presents a literature overview of media and its management, the characteristics of media projects, agile project management, an analysis of agile approaches and media management along with the proposal of a...

  • Mathematical Approach to Assess a Human Gait

    Publikacja
    • W. Wojnicz
    • B. Zagrodny
    • M. Ludwicki
    • J. Awrejcewicz

    - Rok 2022

    A purpose of the paper was to create a mathematical approach to assess a human gait. The scope of the study was to model a normal gait in the sagittal plane and frontal plane of the body. Applying the Newton-Euler formulation, three multibody biomechanical models were derived to describe single support phase and double support phase of the gait. To model a gait in the sagittal plane the open-close sagittal 6DOF model and the open-close...

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  • Informal work in Poland - a regional approach

    In our paper we try to combine the theories explaining the prevalence of informal work, using a regional approach. Reviewing the literature, we observe that, there is no evidence to confirm that the relationships that occur in cross-country comparisons remain significant when we use regional data and analyse cross-regional variations. Our general question is therefore whether there is simply more informal work in less-developed...

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  • A Control Theoretical Approach to Spectral Factorization is Unstable

    Local stability analysis of a recently proposed recursive feedback-based approach to spectral factorization is performed. The method is found not to give stability guarantees. Interestingly enough, its global behavior often allows one to obtain reasonable approximations of spectral factorizations if a suitable stopping criterion is employed.

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  • Approach to security assessment of critical infrastructures' information systems

    Publikacja

    - IET Information Security - Rok 2011

    This study presents an approach to the security assessment of the information systems of critical infrastructures. The approach is based on the faithful reconstruction of the evaluated information system in a computer security laboratory followed by simulations of possible threats against the system. The evidence collected during the experiments, stored and organised using a proprietary system InSAW, may later be used for the creation...

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  • Client-server Approach in the Navigation System for the Blind

    The article presents the client‐server approach in the navigation system for the blind ‐ “Voice Maps”. The authors were among the main creators of the prototype and currently the commercialization phase is being finished. In the implemented prototype only exemplary, limited spatial data were used, therefore they could be stored and analysed (for path-finding process) in the mobile device’s memory without any difficulties. The...

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  • Port-based approach to distributed transfer function method

    Publikacja

    In the paper there is presented an uniform, port-based approach to modeling of both lumped and distributed parameter systems. Port-based model of distributed system has been defined by application of distributed transfer function method (DTFM). The approach proposed combines versatility of port - based modeling and accuracy of distributed transfer function method. It enables to formulate appropriate input data for computer analysis...

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  • A modern approach to an unmanned vehicle navigation

    A traditional approach to manned vehicles navigation uses a data combined form a variety of navigation sensors like satellite, inertial and time-of-flight. With support of operators perception, chart and sensor, data are analyzed and navigation decisions are made. An unmanned platforms navigation needs an operators support, who is supervising a platforms decision process, basing on navigation data obtained via variety of electronic...

  • Electron mobility variance in semiconductors: the variance approach

    Publikacja
    • S. Melkonyan
    • H. Asriyan
    • A. Surmalyan
    • J. Smulko

    - Armenian Journal of Physics - Rok 2011

    Praca przedstawia nowe podejście da analizy zjawisk losowych w półprzewodnikach. Uwzględnia kilka mechanizmów zjawisk fluktuacji ruchliwości w półprzewodnikach, prowadzących do powstawamai składowej szumów typu 1/f, dominujących w zakresie małych czetotliwości. Przedstawia analizę sposobu wyznaczenia stałej Hooge'a określającej intensywność szumów typu 1/f.The statistical non-triviality of current carrier mobility fluctuations...

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  • Magdalena Apollo dr inż.

    2017 - PhD in Civil Engineering, thesis: Risk management in construction investments related to urban regeneration projects, Gdansk University of Technology IX 2012–VI 2013 - Postgraduate Studies at Gdynia Maritime University: Research Project Management (IPMA D Certificate) 2010 – MSc in Management and Marketing, Gdansk University of Technology 2007 – MSc in Civil Engineering, Gdansk University of Technology 2007-2010 - structural...

  • Power Hardware-in-the-Loop Approach In Power System Development

    The main objective of the research is the verification of the Power Hardware-In-The-Loop (PHIL) approach in power system analysis and design. The premise of the article is that using PHIL approach the performance of the power system in steady and transient state conditions can be analysed in real power system conditions. Models of induction machine were developed and real time simulations were performed. Simulation variables were...

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  • An Approach to Agent-Based Supporting System for IT Projects

    Publikacja

    Abstract. The natural development of information technology area stimulates intense growth of various technologies which support basic organization processes. The range of technologies implies appropriate management thereof, as well as accurate correspondence with conducted activities. Abandonment of activities within individual branches in favour of project approach to performed assignments (especially those connected with software...

  • Alternative convolution approach to friction in unsteady pipe flow

    In the paper some aspects of the unsteady friction in pipe flow expressed by the convolution are analyzed. This additional term introduced into the motion equation involves the accelerations of fluid occurring in the past and a weighting function. The essence of such approach is to assume the appropriate form of weighting function. However, until now no fully reliable formula for this function has been found. To avoid some inconveniences...

  • Direct spectrum detection based on Bayesian approach

    The paper investigates the Bayesian framework's performance for a direct detection of spectrum parameters from the compressive measurements. The reconstruction signal stage is eliminated in by the Bayesian Compressive Sensing algorithm, which causes that the computational complexity and processing time are extremely reduced. The computational efficiency of the presented procedure is significantly...

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  • A New Approach to Stability Evaluation of Digital Filters

    Publikacja

    - Rok 2018

    In this paper, a new numerical method of evaluating digital filter stability is presented. This approach is based on novel root-finding algorithms at the complex plane using the Delaunay triangulation and Cauchy's Argument Principle. The presented algorithm locates unstable zeros of the characteristic equation with their multiplicities. The proposed method is generic and can be applied to a vast range of systems. Verification of...

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  • Improving the Performance of Ontological Querying by using a Contextual Approach

    In the paper we present the results of experiment we performed to determine whether a contextual approach may be used to increase the performance of querying a knowledge base. For the experiments we have used a unique setting where we put much effort in developing a contextual and a non-contextual ontology which are as much close counterparts as possible. To achieve this we created a contextual version...

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  • A two dimensional approach for modelling of pennate muscle behaviour

    Publikacja

    - Biocybernetics and Biomedical Engineering - Rok 2017

    The purpose of this study was to elaborate a two-dimensional approach for unipennate and bipennate striated skeletal muscle modelling. Behavior of chosen flat pennate muscle is modelled as a rheological system composed of serially linked passive and active fragments having different mechanical properties. Each fragment is composed of three elements: mass element, elastic element and viscous element. Each active fragment furthermore...

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  • Pedestrian safety management using the risk-based approach

    The paper presents a concept of a multi-level pedestrian safety management system. Three management levels are distinguished: strategic, tactical and operational. The basis for the proposed approach to pedestrian safety management is a risk-based method. In the approach the elements of behavioural and systemic theories were used, allowing for the development of a formalised and repeatable procedure integrating the phases of risk...

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  • Comparison of Polish and Danish Approach to Promotion of Cycling

    Publikacja

    - Rok 2017

    The article describes two different approaches to promotion of cycling from Denmark and Poland. In the former the promotion locally from 2009 to 2015 has been supported financially by the national government and where initiatives partly have been financed by the national level. In Poland, the promotion has been implemented often as a result of bottom up initiatives and financed solely on local level often with the support of EU...

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  • A Measurement-Based Approach for Speed Control of Induction Machines

    Publikacja
    • M. A. Fnaiech
    • S. Khadraoui
    • H. N. Nounou
    • M. N. Nounou
    • J. Guziński
    • H. Abu-Rub
    • A. Datta
    • S. P. Bhattacharyya

    - IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS - Rok 2014

    This paper presents an approach to design a measurement-based controller for induction machines. The proposed control approach is motivated by the fact that developing an appropriate mechanical model of such induction machines is a challenging task. Since our proposed control methodology is only on the basis of measured data, the controller design does not require any information about the model of the mechanical part. The control...

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  • CONTEMPORARY APPROACH TOWARDS RESPONSIVE ARCHITECTURE

    Publikacja

    - Rok 2018

    Constantly changing environment pressures every living for a change, and response becomes a basic reaction of any living form. Change is a natural reaction that enables survivor of all the species. However, in architecture, the responsive structure did not take important role until the twentieth century. During that time many concepts and building introduced kinematics into the discipline. In the late 50 and 60 of XX century, visionary...

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