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Special issue devoted to the 14th International conference “Dynamical Systems — Theory and Applications”
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Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik
Yazar(lar) :
Jan Awrejcewicz
Konu :
Applied Mathematics, Computational Mechanics
Yıl :
2019
Jan Awrejcewicz
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This special issue consists of selected papers presented on the 14th International Conference on “Dynamical Systems — Theory and Applications” (DSTA 2017), held on December 11–14, 2017 in Łódź, Poland. The content of the presented articles includes modern states and contemporary perspectives of mathematical modeling, simulation, stability, control and new mathematical methods addressed to nonlinear dynamical systems, both in theoretical aspects and practical applications.
DOI : 10.1002/zamm.1889
ISSN: 0044-2267
Sayı: 4
Cilt: 99
Sayfa: e1889
2
Numerical analysis of the oscillations of human vocal cords
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Dergi Makalesi
Kaynak :
Springer Link
Dergi:
Nonlinear Dynamics
Yazar(lar) :
Jan Awrejcewicz
Konu :
Electrical and Electronic Engineering, Applied Mathematics, Mechanical Engineering, Ocean Engineering, Aerospace Engineering, Control and Systems Engineering
Yıl :
1991
Jan Awrejcewicz
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Nonlinear differential equations of the fifth order, which govern the oscillations of the human vocal cords, are analyzed. A combined numerical technique is used to observe the regular and irregular solutions of these equations. A scenario from periodic, via quasiperiodic to chaotic attractor is demonstrated. A perturbation of the strange chaotic attractor to principal, combination and primary resonances is also discussed and illustrated.
DOI : 10.1007/bf00045054
Anahtar Kelimeler : Periodic, quasiperiodic and chaotic orbits, fixed points, vocal cords, shooting method
ISSN: 0924-090X 1573-269X
Sayı: 1
Cilt: 2
Sayfa: 35-52
3
Three Routes to Chaos in Simple Sinusoidally Driven Oscillators
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik
Yazar(lar) :
Jan Awrejcewicz
Konu :
Applied Mathematics, Computational Mechanics
Yıl :
1991
Jan Awrejcewicz
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DOI : 10.1002/zamm.19910710202
ISSN: 0044-2267
Sayı: 2
Cilt: 71
Sayfa: 71-79
4
Preface to the Special Issue after DSTA’19 Conference
Dergi Makalesi

Dergi Makalesi
Kaynak :
Wiley Online Library
Dergi:
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik
Yazar(lar) :
Jan Awrejcewicz
Konu :
Applied Mathematics, Computational Mechanics
Yıl :
2021
Jan Awrejcewicz
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DOI : 10.1002/zamm.202002052
ISSN: 0044-2267
Sayı: 1
Cilt: 101

5
Modeling and analysis of continuous dynamical systems
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Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Latin American Journal of Solids and Structures
Yazar(lar) :
Jan Awrejcewicz
Jan Awrejcewicz
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
DOI : 10.1590/S1679-78252013000100002
Cilt: 10
Sayı: 1
Sayfa: 3 - 4
6
Biological and mechanical systems in modern control theory
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Communications in Nonlinear Science and Numerical Simulation
Yayıncı:
Elsevier
Yazar(lar) :
Jan Awrejcewicz
Yıl :
2011
Jan Awrejcewicz
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DOI : 10.1016/j.cnsns.2010.06.005
ISSN: 1007-5704
Sayı: 5
Cilt: 16
Sayfa: 2203-2204
Sınıflandırma :
7
Preface: Recent trends in the dynamics of structures
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Mechanics Research Communications
Yayıncı:
Elsevier
Yazar(lar) :
Jan Awrejcewicz
Yıl :
2017
Jan Awrejcewicz
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DOI : 10.1016/j.mechrescom.2017.05.002
ISSN: 0093-6413
Cilt: 82
Sayfa: 1-2
8
Guest editorial
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Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Mathematical Problems in Engineering
Yazar(lar) :
Jan Awrejcewicz
Yıl :
2005
Jan Awrejcewicz
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
DOI : 10.1155/MPE.2005.391
Cilt: 2005
Sayı: 4
Sayfa: 391 - 392
Sınıflandırma :
9
Dynamical systems theory and applications
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Communications in Nonlinear Science and Numerical Simulation
Yayıncı:
Elsevier
Yazar(lar) :
Jan Awrejcewicz
Yıl :
2006
Jan Awrejcewicz
Tam Metin
Kaydet Alıntıla
DOI : 10.1016/j.cnsns.2005.01.002
ISSN: 1007-5704
Sayı: 5
Cilt: 11
Sayfa: 553-554
Sınıflandırma :
10
Foreword
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Dergi Makalesi
Kaynak :
Springer Link
Dergi:
Acta Mechanica Sinica
Yazar(lar) :
Jan Awrejcewicz
Konu :
Mechanical Engineering, Computational Mechanics
Yıl :
2011
Jan Awrejcewicz
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Tam Metin
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DOI : 10.1007/s10409-011-0442-z
Anahtar Kelimeler : Dynamical System, Fluid Dynamics, Applied Mathematic, Mechanical System, Computational Intelligence
ISSN: 0567-7718 1614-3116
Sayı: 1
Cilt: 27
Sayfa: 1-1
11
Determination of the limits of the unstable zones of the unstationary non-linear mechanical systems
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
International Journal of Non-Linear Mechanics
Yayıncı:
Elsevier
Yazar(lar) :
Jan Awrejcewicz
Yıl :
1988
Jan Awrejcewicz
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The paper presents a method of determining the unstable zones of mechanical systems circumscribed with the ordinary non-linear differential equations with periodically variable coefficients, on the assumption that the parametric excitation and non-linearity in the system are small (of the order of small parameters μ and ϵ). In this method the solutions are searched in the form of power series in relation to two small independent parameters μ and ϵ.
DOI : 10.1016/0020-7462(88)90008-x
ISSN: 0020-7462
Sayı: 1
Cilt: 23
Sayfa: 87-94
12
Preface to the special issue of selected papers from the 15th International Conference Dynamical Systems – Theory and Applications (DSTA 2019)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Applied Mathematical Modelling
Yayıncı:
Elsevier BV
Yazar(lar) :
Jan Awrejcewicz
Yıl :
2021
Jan Awrejcewicz
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Kaydet Alıntıla
DOI : 10.1016/j.apm.2021.01.016
ISSN: 0307-904X
Cilt: 93
Sayfa: 924-925
13
Preface
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Dergi:
Nonlinear Dynamics
Yazar(lar) :
Jan Awrejcewicz
Konu :
Electrical and Electronic Engineering, Applied Mathematics, Mechanical Engineering, Ocean Engineering, Aerospace Engineering, Control and Systems Engineering
Yıl :
2007
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
DOI : 10.1007/s11071-007-9226-1
Anahtar Kelimeler : Singular Perturbation Theory, Multiple Scale Method, Geometric Singular Perturbation Theory, Buckle Beam, Singular Control Problem
ISSN: 0924-090X 1573-269X
Sayı: 4
Cilt: 50
Sayfa: 743-745
14
Differential Equations and Modeling of Dynamical Mechanical and Biomechanical Systems
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Dergi:
Differential Equations and Dynamical Systems
Yazar(lar) :
Jan Awrejcewicz
Konu :
Applied Mathematics, Analysis
Yıl :
2012
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
DOI : 10.1007/s12591-012-0134-6
ISSN: 0971-3514 0974-6870
Sayı: 1-2
Cilt: 21
Sayfa: 1-2
15
Strange nonlinear behaviour governed by a set of four averaged amplitude equations
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Dergi:
Meccanica
Yazar(lar) :
Jan Awrejcewicz
Konu :
Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics
Yıl :
1996
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Oscillations of a string-type generator with a time-delay amplifier are studied. Nonlinear dynamics of this system is governed by a set of partial, ordinary and integral equations with a time delay. First, an analytical perturbation method (supported by symbolic computation) which yields the averaged amplitude equations (AVE) is presented and then the amplitude equations are analysed numerically, showing some surprising phenomena.
DOI : 10.1007/bf00426995
Anahtar Kelimeler : Self-oscillations, Aperiodic oscillations, Averaged equations, Symbolic computation, Bifurcation and chaos
ISSN: 0025-6455 1572-9648
Sayı: 3
Cilt: 31
Sayfa: 347-361
16
Wear Processes in a Mechanical Friction Clutch: Theoretical, Numerical, and Experimental Studies
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Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Mathematical Problems in Engineering
Yazar(lar) :
Dariusz Grzelczyk , Jan Awrejcewicz
Yıl :
2015
Jan Awrejcewicz
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
Mathematical modeling, theoretical/numerical analysis, and experimental verification of wear processes occurring on the contact surface of friction linings of a mechanical friction clutch are studied. In contrast to many earlier papers we take into consideration wear properties and flexibility of friction materials being in friction contact. During mathematical modeling and numerical simulations we consider a general nonlinear differential model of wear (differential wear model) and a model of wear in the integral form (integral wear model). Equations governing contact pressure and wear distributions of individual friction linings, decrease of distance between clutch shields, and friction torque transmitted by the clutch are derived and compared with experimental data. Both analytical and numerical analyses are carried out with the qualitative and quantitative theories of differential and integral equations, including the Laplace transform approach to ODEs. We show that theoretical results and numerical simulations agree with the experimental data. Finally, a numerical analysis of the proposed mathematical models was carried out in a wider range of parameters of the considered system.
DOI : 10.1155/2015/725685
Cilt: 2015
Sınıflandırma :
17
Reflectivity of Cholesteric Liquid Crystals with an Anisotropic Defect Layer Inside
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Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Photonics
Yazar(lar) :
Dariusz Grzelczyk , Jan Awrejcewicz
Yıl :
2020
Jan Awrejcewicz
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
In this study, first, we numerically investigated the reflectivity of a cholesteric liquid crystal with an anisotropic defect layer inside. To model optical phenomena in the examined system, a 4 × 4 matrix method was employed. The tests were carried out for different thicknesses of the whole system, different thicknesses of the defect layer, as well as different defect layer locations inside the cell. Next, a cholesteric liquid crystal comprising a defect layer and held between two parallel electrical conductors was also considered. In this case, the optical properties of the system could also be adjusted by an external applied electric field. Some interesting simulation results of the reflection coefficient (i.e., the fraction of electromagnetic energy reflected) were obtained, illustrated, and discussed. The simulation results showed a significant influence of both the defect and the external electric field on the selective reflection phenomenon, and the possibility of controlling the shape of the reflection spectrum. Finally, some potential applications of the analyzed optical system were discussed.
DOI : 10.3390/photonics7030058
Anahtar Kelimeler : photonic materials, cholesteric liquid crystal, optical metrology, reflectivity, reflection, bandgap
ISSN: 2304-6732
Cilt: 7
Sayı: 58
Sayfa: 58
Sınıflandırma :
18
Regular and chaotic motion of a bush-shaft system with tribological processes
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Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Mathematical Problems in Engineering
Yazar(lar) :
Jan Awrejcewicz , Yuriy Pyryev
Yıl :
2006
Jan Awrejcewicz
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
The methods of both analysis and modeling of contact bush-shaft systems exhibiting heat generation and wear due to friction are presented [3–5]. From the mathematical point of view, the considered problem is reduced to the analysis of ordinary differential equations governing the change of velocities of the contacting bodies, and to the integral Volterra-type equation governing contact pressure behavior. In the case where tribological processes are neglected, thresholds of chaos are detected using bifurcation diagrams and Lyapunov exponents identification tools. In addition, analytical Mel'nikov's method is applied to predict chaos. It is shown, among the others, that tribological processes play a stabilizing role. The following theoretical background has been used in the analysis: perturbation methods, Mel'nikov's techniques [7,8], Laplace transformations, the theory of integral equations, and various variants of numerical analysis.
DOI : 10.1155/MPE/2006/86594
Cilt: 2006
Sınıflandırma :
19
Ritz Method in Vibration Analysis for Embedded Single-Layered Graphene Sheets Subjected to In-Plane Magnetic Field
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Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Symmetry
Yazar(lar) :
Olga Mazur , Jan Awrejcewicz
Yıl :
2020
Jan Awrejcewicz
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
Vibrations of single-layered graphene sheets subjected to a longitudinal magnetic field are considered. The Winkler-type and Pasternak-type foundation models are employed to reproduce the surrounding elastic medium. The governing equation is based on the modified couple stress theory and Kirchhoff–Love hypotheses. The effect of the magnetic field is taken into account due to the Lorentz force deriving from Maxwell’s equations. The developed approach is based on applying the Ritz method. The proposed method is tested by a comparison with results from the existing literature. The numerical calculations are performed for different boundary conditions, including the mixed ones. The influence of the material length scale parameter, the elastic foundation parameters, the magnetic parameter and the boundary conditions on vibration frequencies is studied. It is observed that an increase of the magnetic parameter, as well as the elastic foundation parameters, brings results closer to the classical plate theory results. Furthermore, the current study can be applied to the design of microplates and nanoplates and their optimal usage.
DOI : 10.3390/sym12040515
Anahtar Kelimeler : Ritz method, modified couple stress theory, magnetic field, elastic foundation
ISSN: 2073-8994
Cilt: 12
Sayı: 515
Sayfa: 515
Sınıflandırma :
20
Analytical prediction of stick-slip chaos in a double self-excited Duffing-type oscillator
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Dergi Makalesi
Open Access
Kaynak :
Directory of Open Access Journals (DOAJ)
Dergi:
Mathematical Problems in Engineering
Yazar(lar) :
Jan Awrejcewicz , Mariusz Holicke
Yıl :
2006
Jan Awrejcewicz
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
We have analytically predicted homoclinic bifurcations in a class of double self-excited Duffing-type oscillators using the Melnikov-Gruendler approach. Both stick-slip and smooth chaotic behaviors predicted analytically have been confirmed by numerical simulations.
DOI : 10.1155/MPE/2006/70245
Cilt: 2006
Sınıflandırma :
21
Approximate modelling of resulting dry friction forces and rolling resistance for elliptic contact shape
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
European Journal of Mechanics - A/Solids
Yayıncı:
Elsevier
Yazar(lar) :
Grzegorz Kudra , Jan Awrejcewicz
Yıl :
2013
Jan Awrejcewicz
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Tam Metin
Kaydet Alıntıla
There are many examples of mechanical systems with non-point friction contacts (billiard ball, Thompson top, wobblestone, electric polishing machine, the wobblestone, the Celtic stone), where the assumption of one-dimensional dry friction model do not necessarily lead to satisfactory accuracy of the numerical simulation. Moreover the rolling resistance often plays an important role in such systems. The paper is devoted to the problem of developing an approximate coupled model of resulting dry friction force and moment as well as rolling resistance, suitable for fast numerical simulation of rigid bodies with friction contacts, i.e. allowing to avoid the space discretization. An integral model of dry friction components is built under assumption of classical Coulomb friction law and fully developed sliding on the contact area of general shape and arbitrary contact pressure distribution. Then the special model of stress distribution over the elliptic contact area is developed, being a kind of generalization of Hertzian normal stress distribution, with addition of special distortion related to the rolling resistance. Finally some original approximate models of friction force and moment are proposed, based on Padé approximants and their generalizations as well as in the form of piecewise polynomial functions.
DOI : 10.1016/j.euromechsol.2013.07.005
ISSN: 0997-7538
Cilt: 42
Sayfa: 358-375
Sınıflandırma :
22
Changes in the gait characteristics caused by external load, ground slope and velocity variation
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Communications in Nonlinear Science and Numerical Simulation
Yayıncı:
Elsevier
Yazar(lar) :
Jerzy Mrozowski , Jan Awrejcewicz
Yıl :
2011
Jan Awrejcewicz
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Tam Metin
Kaydet Alıntıla
The complexity of the human gait manifests itself by lots of parameters that can evoke different changes in the walking manner. They can be divided into two groups: inherent, like anthropometric features or peculiar psychomotor type, and those related to the external conditions. The aim of the paper is to analyze the influence of three parameters, i.e. external load, ground slope and gait velocity, on the locomotion characteristics and the gait stability. Within the framework of investigations for different values of the mentioned parameters a film registration of the trajectories of selected kinematic nodes during some gait cycles has been carried out. The obtained data was a subject of numerical calculation aimed at extracting the essential properties of the principal gait characteristics.
DOI : 10.1016/j.cnsns.2010.04.059
Anahtar Kelimeler : Human gait, Locomotion characteristics
ISSN: 1007-5704
Sayı: 5
Cilt: 16
Sayfa: 2313-2318
Sınıflandırma :
23
Experimental investigations and control of mechanical systems dynamics
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Dergi Makalesi
Kaynak :
Springer Link
Dergi:
International Journal of Dynamics and Control
Yazar(lar) :
Jan Awrejcewicz , Paweł Olejnik
Konu :
Electrical and Electronic Engineering, Control and Optimization, Mechanical Engineering, Modelling and Simulation, Civil and Structural Engineering, Control and Systems Engineering
Yıl :
2015
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
DOI : 10.1007/s40435-015-0174-1
ISSN: 2195-268X 2195-2698
Sayı: 2
Cilt: 3
Sayfa: 195-197
24
Chaos prediction in the duffing-type system with friction using Melnikov's function
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nonlinear Analysis: Real World Applications
Yayıncı:
Elsevier
Yazar(lar) :
Jan Awrejcewicz , Yuriy Pyryev
Yıl :
2006
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Nonlinear equations governing chaotic dynamics exhibited by a class of lumped mechanical systems with dry friction are analysed. It is shown that the obtained corresponding Melnikov's function can be simplified in some cases to yield analytical conditions for chaos occurrence. The analytical predictions are verified numerically.
DOI : 10.1016/j.nonrwa.2005.01.002
Anahtar Kelimeler : Melnikov's function, Chaos, Duffing-type system, Rotating shaft, Rigid bush, Friction
ISSN: 1468-1218
Sayı: 1
Cilt: 7
Sayfa: 12-24
Sınıflandırma :
25
Dynamics of a two-degrees-of-freedom system with friction and heat generation
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Communications in Nonlinear Science and Numerical Simulation
Yayıncı:
Elsevier
Yazar(lar) :
Jan Awrejcewicz , Yuriy Pyryev
Yıl :
2006
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A novel thermomechanical model of frictional self-excited stick-slip vibrations is proposed. A mechanical system consisting of two masses which are coupled by an elastic spring and moving vertically between two walls is considered. It is assumed that between masses and walls a Coulomb friction occurs, and stick-slip motion of the system is studied. The applied friction force depends on a relative velocity of the sliding bodies. Stability of stationary solutions is considered. A computation of contact parameters during heating of the bodies is performed. The possibility of existence of frictional auto-vibrations is illustrated and discussed.
DOI : 10.1016/j.cnsns.2005.01.008
Anahtar Kelimeler : 2.30.Hq, 2.30.Jr, 2.60.Jh, 2.60.Jl, 46.55.+d, Friction, Instability, Stick-slip, Frictional heating, Temperature
ISSN: 1007-5704
Sayı: 5
Cilt: 11
Sayfa: 635-645
Sınıflandırma :
26
Tribological periodic processes exhibited by acceleration or braking of a shaft–pad system
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Communications in Nonlinear Science and Numerical Simulation
Yayıncı:
Elsevier
Yazar(lar) :
Jan Awrejcewicz , Yuriy Pyryev
Yıl :
2004
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A new one-dimensional thermoelastic frictional pair contact model of a shaft–bush system is proposed. The assumed model includes a study of vibration processes and contact characteristics exhibited by a relative velocity between the two mentioned bodies, contact temperature, pressure and wear. Some important conclusions are formulated.
DOI : 10.1016/s1007-5704(03)00022-4
Anahtar Kelimeler : Friction, Wear, Frictional heat generation, Sticku2013slip vibrations
ISSN: 1007-5704
Sayı: 6
Cilt: 9
Sayfa: 603-614
Sınıflandırma :
27
One-dimensional discrete LQR control of compression of the human chest impulsively loaded by fast moving point mass
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Communications in Nonlinear Science and Numerical Simulation
Yayıncı:
Elsevier
Yazar(lar) :
Paweł Olejnik , Jan Awrejcewicz
Yıl :
2011
Jan Awrejcewicz
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Tam Metin
Kaydet Alıntıla
This paper uncovers some interesting extension of an optimal discrete control methodology partially included in Proceedings and presented at the international conference on “Dynamical Systems Theory and Applications”. There has been applied a scheme for realisation of active control strategy with numerically estimated linear optimal quadratic index of performance in reduction of impact-induced deformation of human chest loaded by a point mass at the central point of upper-torso body. We focused on application of one active element attached between torso’s upper back (looking from posterior direction) and a fixed support. As the practical result we provide values of quality and reaction matrices, some useful deformation and energy dissipation time-characteristics and the resulting shape of control force time-characteristics that would be the demanding one for a hypothetical real implementation.
DOI : 10.1016/j.cnsns.2010.04.058
Anahtar Kelimeler : Optimal LQR control, Dynamics of human chest, Elastic impact
ISSN: 1007-5704
Sayı: 5
Cilt: 16
Sayfa: 2225-2229
Sınıflandırma :
28
A mechatronic experimental system for control of fluid level in LabVIEW
Konferans Bildirileri

Konferans Bildirileri
Kaynak :
IEEE Xplore
Yazar(lar) :
Pawel Olejnik , Jan Awrejcewicz
Konu :
Bioengineering, Components, Circuits, Devices and Systems, General Topics for Engineers, Robotics and Control Systems, Signal Processing and Analysis
Yıl :
2019
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A sequential closed-loop control system based on a hybrid P-correction is applied to maintain the desired setpoint level at leakages and to follow a prescribed series of time-varying reference levels. Mathematical models of the two configurations of the investigated hydraulic control system are implemented using LabVIEW virtual instruments. As a result, there are identified approximate characteristics of the system parameters as well as time histories of the process variable converging to reference set-points. Reference input, being introduced to evaluate the effectiveness and robustness of the regulation of level height with periodic intakes of water.
DOI : 10.1109/carpathiancc.2019.8765959
Anahtar Kelimeler : closed loop systems, hydraulic systems, mechatronics, time-varying systems, virtual instrumentation, mechatronic experimental system, fluid level, sequential closed-loop control system, hybrid P-correction, time-varying reference levels, mathematical models, LabVIEW virtual instruments, system parameters, hydraulic control system, experimental test stand, control of liquid level, numerical model, LabVIEW
29
Coupled oscillators in identification of nonlinear damping of a real parametric pendulum
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Mechanical Systems and Signal Processing
Yayıncı:
Elsevier
Yazar(lar) :
Paweł Olejnik , Jan Awrejcewicz
Yıl :
2018
Jan Awrejcewicz
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A damped parametric pendulum with friction is identified twice by means of its precise and imprecise mathematical model. A laboratory test stand designed for experimental investigations of nonlinear effects determined by a viscous resistance and the stick-slip phenomenon serves as the model mechanical system. An influence of accurateness of mathematical modeling on the time variability of the nonlinear damping coefficient of the oscillator is proved. A free decay response of a precisely and imprecisely modeled physical pendulum is dependent on two different time-varying coefficients of damping. The coefficients of the analyzed parametric oscillator are identified with the use of a new semi-empirical method based on a coupled oscillators approach, utilizing the fractional order derivative of the discrete measurement series treated as an input to the numerical model. Results of application of the proposed method of identification of the nonlinear coefficients of the damped parametric oscillator have been illustrated and extensively discussed.
DOI : 10.1016/j.ymssp.2017.04.037
Anahtar Kelimeler : Time series analysis, Synchronization, Coupled oscillators, Numerical simulation, Solution of equations, Numerical differentiation and integration, Approximations and expansions, Nonlinear dynamics
ISSN: 0888-3270
Cilt: 98
Sayfa: 91-107
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