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Wyświetlanie 1-15 z 40
Tytuł:
Implementation of Adaptive Generalized Sidelobe Cancellers Using Efficient Complex Valued Arithmetic
Autorzy:
Glentis, G. O.
Powiązania:
https://bibliotekanauki.pl/articles/908084.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
elektronika
adaptive beamforming
generalized sidelobe canceller
LMS algorithm
complex valued arithmetic
Opis:
Low complexity realizations of Least Mean Squared (LMS) error, Generalized Sidelobe Cancellers (GSCs) applied to adaptive beamforming are considered. The GSC method provides a simple way for implementing adaptive Linear Constraint Minimum Variance (LCMV) beamformers. Low complexity realizations of adaptive GSCs are of great importance for the design of high sampling rate, and/or small size and low power adaptive beamforming systems. The LMS algorithm and its Transform Domain (TD-LMS) counterpart are considered for the adaptive processing task involved in the design of optimum GSC systems. Since all input signals are represented by complex variables, complex valued arithmetic is utilized for the realization of GSC algorithms, either on general purpose computers, or on dedicated VLSI ASICs. Using algorithmic strength reduction (SR) techniques, two novel algorithms are developed for efficient realizations of both LMS GSCs and TD-LMS GSC schemes. Both of the proposed algorithms are implemented using real valued arithmetic only, whilst reducing the number of multipliers by 25% and 20%, respectively. When VLSI implementation aspects are considered, both the proposed algorithms result in reduced power dissipation and silicon area realizations. The performance of the proposed realizations of the LMS based GSC methods is illustrated in the context of typical beamforming applications.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 4; 549-566
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-Tuning Generalized Predictive Control With Input Constraints
Autorzy:
Królikowski, A.
Jerzy, D.
Powiązania:
https://bibliotekanauki.pl/articles/908330.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
samostrojenie
sterowanie
generalized predictive control
constraints
self-tuning
ARIMAX/ARMAX systems
Opis:
The handling of various input constraints in the self-tuning generalized predictive control (STGPC) problem of ARIMAX/ARMAX systems is considered. The methods based on the Lagrange multipliers and Lemke's algorithm are used to solve the constrained optimization problem. A self-tuning controller is implemented in an indirect way, and the considered constraints imposed on the control input signal are of the rate, amplitude and energy types. A comparative simulation study of self-tuning control system behaviour is given with respect to the design parameters and constraints. The stability of a closed-loop control system is analyzed and the computational loads of both the methods are compared.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 2; 459-479
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of waves generated in transversely isotropic micropolar generalized thermoelastic half space under temperature dependent properties
Autorzy:
Gupta, R. R.
Powiązania:
https://bibliotekanauki.pl/articles/264335.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
propagacja fal
termoelastyczność
naprężenia
micropolar
transversely isotropic
generalized thermoelastic
amplitude ratios
Opis:
The present study deals with the propagation of waves in a transversely isotropic micropolar generalized thermoelastic material possessing temperature dependent elastic properties. After developing the solution for LS, GL and CT theory, the phase velocities and attenuation quality factor have been obtained. The expressions for amplitudes of stresses, displacements, microratation and temperature distribution have been derived and computed numerically. The numerically evaluated results have been plotted graphically. Some particular cases of interest have also been obtained.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 53-65
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A generalization of the graph Laplacian with application to a distributed consensus algorithm
Autorzy:
Zhai, G.
Powiązania:
https://bibliotekanauki.pl/articles/331278.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
graph Laplacian
generalized graph Laplacian
adjacency weights
distributed consensus algorithm
cooperative control
Opis:
In order to describe the interconnection among agents with multi-dimensional states, we generalize the notion of a graph Laplacian by extending the adjacency weights (or weighted interconnection coefficients) from scalars to matrices. More precisely, we use positive definite matrices to denote full multi-dimensional interconnections, while using nonnegative definite matrices to denote partial multi-dimensional interconnections. We prove that the generalized graph Laplacian inherits the spectral properties of the graph Laplacian. As an application, we use the generalized graph Laplacian to establish a distributed consensus algorithm for agents described by multi-dimensional integrators.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 2; 353-360
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propagation of plane waves in a rotating transversely isotropic two temperature generalized thermoelastic solid half-space with voids
Autorzy:
Bijarnia, R.
Singh, B.
Powiązania:
https://bibliotekanauki.pl/articles/265710.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
anizotropia
termosprężystość
odbicie
anisotropy
generalized thermoelasticity
voids
plane waves
reflection
reflection coefficient
Opis:
The paper is concerned with the propagation of plane waves in a transversely isotropic two temperature generalized thermoelastic solid half-space with voids and rotation. The governing equations are modified in the context of Lord and Shulman theory of generalized thermoelasticity and solved to show the existence of four plane waves in the x – z plane. Reflection of these plane waves from thermally insulated stress free surface is also studied to obtain a system of four non-homogeneous equations. For numerical computations of speed and reflection coefficients, a particular material is modelled as transversely isotropic generalized thermoelastic solid half-space. The speeds of plane waves are computed against the angle of propagation to observe the effects of two temperature and rotation. Reflection coefficients of various reflected waves are also computed against the angle of incidence to observe the effects of various parameters.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 285-301
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical procedure for filtering and efficient high-order signal differentiation
Autorzy:
Ibrir, S.
Diop, S.
Powiązania:
https://bibliotekanauki.pl/articles/907392.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
walidacja krzyżowa
różniczkowanie sygnału
wygładzanie
generalized cross validation
smoothing
differentiation
splines functions
optimization
Opis:
In this paper, we propose a numerical algorithm for filtering and robust signal differentiation. The numerical procedure is based on the solution of a simplified linear optimization problem. A compromise between smoothing and fidelity with respect to the measurable data is achieved by the computation of an optimal regularization parameter that minimizes the Generalized Cross Validation criterion (GCV). Simulation results are given to highlight the effectiveness of the proposed procedure.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 2; 201-208
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable structure observer design for a class of uncertain systems with a time-varying delay
Autorzy:
Liu W., J.
Powiązania:
https://bibliotekanauki.pl/articles/330119.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
obserwator
niezmienniczość
uogólniona odwrotność macierzy
variable structure observer
invariance property
generalized matrix inverse approach
Opis:
Design of a state observer is an important issue in control systems and signal processing. It is well known that it is difficult to obtain the desired properties of state feedback control if some or all of the system states cannot be directly measured. Moreover, the existence of a lumped perturbation and/or a time delay usually reduces the system performance or even produces an instability in the closed-loop system. Therefore, in this paper, a new Variable Structure Observer (VSO) is proposed for a class of uncertain systems subjected to a time varying delay and a lumped perturbation. Based on the strictly positive real concept, the stability of the equivalent error system is verified. Based on the generalized matrix inverse approach, the global reaching condition of the sliding mode of the error system is guaranteed. Also, the proposed variable structure observer will be shown to possess the invariance property in relation to the lumped perturbation, as the traditional variable structure controller does. Furthermore, two illustrative examples with a series of computer simulation studies are given to demonstrate the effectiveness of the proposed design method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 575-583
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wave propagation in a micropolar transversely isotropic generalized thermoelastic half-space
Autorzy:
Gupta, R. R.
Powiązania:
https://bibliotekanauki.pl/articles/955189.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termosprężystość
prędkość fazowa
współczynnik tłumienia drgań sprężystych
micropolar
transversely isotropic
generalized thermoelastic
amplitude ratios
Opis:
Rayleigh waves in a half-space exhibiting microplar transversely isotropic generalized thermoelastic properties based on the Lord-Shulman (L-S), Green and Lindsay (G-L) and Coupled thermoelasticty (C-T) theories are discussed. The phase velocity and attenuation coefficient in the previous three different theories have been obtained. A comparison is carried out of the phase velocity, attenuation coefficient and specific loss as calculated from the different theories of generalized thermoelasticity along with the comparison of anisotropy. The amplitudes of displacements, microrotation, stresses and temperature distribution were also obtained. The results obtained and the conclusions drawn are discussed numerically and illustrated graphically. Relevant results of previous investigations are deduced as special cases.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 247-257
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On propagation of Rayleigh type surface wave in five different theories of thermoelasticity
Autorzy:
Singh, B.
Verma, S.
Powiązania:
https://bibliotekanauki.pl/articles/265155.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termoelastyczność
fala powierzchniowa
fala Rayleigha
równanie częstotliwości
generalized thermoelasticity
surface waves
Rayleigh wave
frequency equation
Opis:
The governing equations for a homogeneous and isotropic thermoelastic medium are formulated in the context of coupled thermoelasticity, Lord and Shulman theory of generalized thermoelasticity with one relaxation time, Green and Lindsay theory of generalized thermoelasticity with two relaxation times, Green and Nagdhi theory of thermoelasticity without energy dissipation and Chandrasekharaiah and Tzou theory of thermoelasticity. These governing equations are solved to obtain general surface wave solutions. The particular solutions in a halfspace are obtained with the help of appropriate radiation conditions. The two types of boundaries at athe surface of a half-space are considered namely, the stress free thermally insulated boundary and stress free isothermal boundary. The particular solutions obtained in a half-space satisfy the relevant boundary conditions at the free surface of the half-space and a frequency equation for the Rayleigh wave speed is obtained for both thermally insulated and isothermal cases. The non-dimensional Rayleigh wave speed is computed for aluminium metal to observe the effects of frequency, thermal relaxation time and different theories of thermoelasticity.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 661-673
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of constrained experimental designs on finite spaces for a modified Ek-optimality criterion
Autorzy:
Uciński, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1838172.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
constrained optimum experimental design
minimal sum of largest eigenvalues
generalized simplicial decomposition
optimal measurement selection
Opis:
A simple computational algorithm is proposed for minimizing sums of largest eigenvalues of the matrix inverse over the set of all convex combinations of a finite number of nonnegative definite matrices subject to additional box constraints on the weights of those combinations. Such problems arise when experimental designs aiming at minimizing sums of largest asymptotic variances of the least-squares estimators are sought and the design region consists of finitely many support points, subject to the additional constraints that the corresponding design weights are to remain within certain limits. The underlying idea is to apply the method of outer approximations for solving the associated convex semi-infinite programming problem, which reduces to solving a sequence of finite min-max problems. A key novelty here is that solutions to the latter are found using generalized simplicial decomposition, which is a recent extension of the classical simplicial decomposition to nondifferentiable optimization. Thereby, the dimensionality of the design problem is drastically reduced. The use of the algorithm is illustrated by an example involving optimal sensor node activation in a large sensor network collecting measurements for parameter estimation of a spatiotemporal process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 4; 659-677
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal disturbances in twinned orthotropic thermoelastic material
Autorzy:
Rani, L.
Singh, V.
Powiązania:
https://bibliotekanauki.pl/articles/265550.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termoelastyczność
transformaty Fouriera
czas relaksacji
generalized thermoelasticity
orthotropic material
relaxation time
Fourier transforms
instantaneous loading
Opis:
This paper deals with deformation in homogeneous, thermally conducting, single-crystal orthotropic twins, bounded symmetrically along a plane containing only one common crystallographic axis. The Fourier transforms technique is applied to basic equations to form a vector matrix differential equation, which is then solved by the eigen value approach. The solution obtained is applied to specific problems of an orthotropic twin crystal subjected to triangular loading. The components of displacement, stresses and temperature distribution so obtained in the physical domain are computed numerically. A numerical inversion technique has been used to obtain the components in the physical domain. Particular cases as quasi-static thermo-elastic and static thermoelastic as well as special cases are also discussed in the context of the problem.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 897-910
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Random perturbation of the variable metric method for unconstrained nonsmooth nonconvex optimization
Autorzy:
El Mouatasim, A.
Ellaia, R.
Souza de Cursi, J. E.
Powiązania:
https://bibliotekanauki.pl/articles/908374.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
optymalizacja
zaburzenie stochastyczne
zaburzenie losowe
nonconvex optimization
stochastic perturbation
variable metric method
nonsmooth optimization
generalized gradient
Opis:
We consider the global optimization of a nonsmooth (nondifferentiable) nonconvex real function. We introduce a variable metric descent method adapted to nonsmooth situations, which is modified by the incorporation of suitable random perturbations. Convergence to a global minimum is established and a simple method for the generation of suitable perturbations is introduced. An algorithm is proposed and numerical results are presented, showing that the method is computationally effective and stable.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 4; 463-474
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On discontinuties in thermoelastic plane waves without energy dissipation due to a thermo-mechanical shock
Autorzy:
Sarkar, N.
Lahiri, A.
Powiązania:
https://bibliotekanauki.pl/articles/265406.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termosprężystość
natężenie Greena-Naghdiego
generalized thermoelasticity
Green-Naghdi model
thermoelastic half-space
pulse function
eigenvalue approach
Opis:
The present paper deals with the thermoelastic plane waves due to a thermo-mechanical shock in the form of pulse at the boundary of a homogeneous, isotropic thermoelastic half-space. The field equations of the Green- Naugdhi theory without energy dissipation for an thermoelastic solid in the generalized thermoelasticity theory are written in the form of a vector-matrix differential equation using Laplace transform techniques and then solved by an eigenvalue approach. Exact expressions for the considered field variables are obtained and presented graphically for copper-like material. The characteristic features of the present theory are analyzed by comparing these solutions with their counterparts in other generalized thcrmoelasticity theories.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 503-519
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction due to mechanical source in generalized thermo microstretch elastic medium
Autorzy:
Singh, R.
Kumar, V.
Powiązania:
https://bibliotekanauki.pl/articles/955155.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
transformacja Laplace'a
termosprężystość
pole elektromagnetyczne
generalized thermo-microstretch
eigenvalue
Laplace transform
Hankel transform
mechanical source
Opis:
The eigen value approach, following the Laplace and Hankel transformation has been employed to find a general solution of the field equations in a generalized thermo microstretch elastic medium for an axisymmetric problem. An infinite space with the mechanical source has been applied to illustrate the utility of the approach. The integral transformations have been inverted by using a numerical inversion technique to obtain normal displacement, normal force stress, couple stress and microstress in the physical domain. Numerical results are shown graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 347-363
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On determination of the stress-strain state of a multi-wedge system with thin radial defects under antiplane deformation
Określenie stanu naprężeń i przemieszczeń w układzie wieloklinowym z promieniowymi defektami przy ścinaniu wzdłużnym
Autorzy:
Makhorkin, M.
Sulym, H.
Powiązania:
https://bibliotekanauki.pl/articles/395807.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
naprężenia
ścinanie wzdłużne
defekty promieniowe
wedge system
angular point
singularity order
stress assymptotics
generalized stress intensity factor
Opis:
An elastic isotropic multi-wedge system with radially located thin defects under longitudinal shear is considered. The procedure of construction of asymptotics of the stress and displacement fields in the vicinity of the system apex using the apparatus of generalized functions and Mellin transform is presented. The notion of generalized stress intensity factor near the wedge system apex is introduced. The procedure proposed is applied to determine analytically the asymptotic distribution of stress and displacement fields in the three-wedge system peak. The generalized stress intensity factor near the three-wedge system apex is analyzed.
Przedstawione badania dotyczą nowego podejścia do rozwiązywania zagadnienia antypłaskiego dla układu wieloklinowego z ułożonymi promieniowo cienkimi niejednorodnościami. Metoda ta, wykorzystuje podejście uogólnionego zagadnienia sprzężenia materiałów do modelowania istnienia cienkich defektów za pomocą funkcji skoków. To daje możliwość otrzymania w postaci analitycznej transformat Mellina naprężeń i przemieszczeń w pakietach z dowolną ilością klinów. Wskutek stosowania metody wyznaczenie stanu naprężeniowo-odkształceniowego w układzie klinowym podczas ścinania wzdłużnego sprowadza się do rozwiązywania jednego częściowo zdegenerowanego równania różniczkowego z odpowiednimi warunkami brzegowymi. Do jego rozwiązania stosuje się transformacja całkowa Mellina, której transformaty dla dowolnej ilości komponentów układu klinowego można znaleźć w postaci analitycznej. W wyniku przeprowadzonych badań zostały otrzymane asymptotyki naprężeń i przemieszczeń w otoczeniu wierzchołka układu klinowego oraz transformaty Mellina przemieszczeń. Wprowadzono pojęcie uogólnionego współczynnika intensywności naprężeń w wierzchołku klina oraz dla szeregu układów wieloklinowych otrzymano postać analityczną dla naprężeń i przemieszczeń w dowolnym punkcie kompozytu. Został również dokładnie zbadany przypadek obciążenia skupioną siłą układu z trzech klinów.
Źródło:
Civil and Environmental Engineering Reports; 2010, 5; 235-249
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 40

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