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Tytuł:
A generalized thermoelastic medium subjected to pulsed laser heating via a two-temperature model
Autorzy:
Abouelregal, Ahmed E.
Zenkour, Ashraf M.
Powiązania:
https://bibliotekanauki.pl/articles/949139.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
two-temperature model
thermoelasticity
non-Gaussian laser pulse
laser intensity
Opis:
This article investigates stress and induced temperature in an isotropic, homogeneous, thermoelastic half-space using a two-temperature generalized thermoelasticity model. The bounding plane surface of the present half-space continuum is subjected to a non-Gaussian laser pulse. Laplace’s transform space is considered to deduce a closed-form solution to the problem. In addition, the inversions of Laplace’s transformations have been carried numerically to obtain field quantities in the transient state. The effects of parameters of two-temperature, laser-pulse and laser intensity are investigated. A concluding remark for the graphical forms of the derived expressions is presented.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 631-639
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Gaussian statistical measures of control performance
Autorzy:
Domański, P. D.
Powiązania:
https://bibliotekanauki.pl/articles/206277.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Control Performance Assessment
statistical measures
PID
disturbance shadowing
non-Gaussian functions
Opis:
Statistical approach to Control Performance Assessment (CPA) is of great practical importance. This is particularly visible in process industry, where there are many PID loops. They are often assessed with measures derived from the Gaussian probabilistic density function. Standard deviation, variance, skewness or kurtosis form the majority of applied indexes. The review of data originating from process industry shows, however, to the contrary, that these signals have rather non-Gaussian properties and are mostly characterized by fat-tailed distribution disable the ability. Investigations show that strong disturbances may significantly disable the capacity of proper assessment. Standard measures often fail in such cases. It is shown that non-Gaussian measures can help with this problem. Various disturbances are tested and compared. Results show that fat-tailed distributions are an interesting alternative. They are less sensitive to disturbance shadowing and still make possible loop dynamic assessment.
Źródło:
Control and Cybernetics; 2017, 46, 3; 259-290
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-temperature theory for a heated semi-infinite solid by a pulsed laser radiation
Autorzy:
Zenkour, Ashraf M.
Abouelregal, Ahmed E.
Powiązania:
https://bibliotekanauki.pl/articles/240137.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermoelasticity
two-temperature
non-Gaussian laser pulse
laser intensity
phase lags
Opis:
In this paper, the two-temperature thermoelasticity model is proposed to a specific problem of a thermoelastic semi-infinite solid. The bounding plane surface of the semi-infinite solid is considered to be under a non-Gaussian laser pulse. Generalized thermoelasticity analysis with dual-phase-lags is taken into account to solve the present problem. Laplace transform and its inversion techniques are applied and an analytical solution as well as its numerical outputs of the field variables are obtained. The coupled theory and other generalized theory with one relaxation time may be derived as special cases. Comparison examples have been made to show the effect of dual-phase-lags, temperature discrepancy, laser-pulse and laser intensity parameters on all felids. An additional comparison is also made with the theory of thermoelasticity at a single temperature.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 85-101
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-parametric modification of cumulative sum algorithms for the change-point detection of non-Gaussian sequences
Autorzy:
Zabolotnii, S. W
Warsza, Z. L.
Powiązania:
https://bibliotekanauki.pl/articles/114188.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
change point
CUSUM algorithm
non-Gaussian sequence
stochastic polynomial
high order statistics
Opis:
The expansion of logarithm likelihood ratio in the stochastic series to find the sequential change-point detection of non-Gaussian sequences is used. The moment criteria of the minimum of upper limit error probabilities sum to find the expansion coefficients is applied. The proposed method is a semi-parametric type of cumulative sum (CUSUM) algorithm which needs of higher-order statistics. Results show that polynomial algorithms are more effective in comparison with similar non-parametric procedures.
Źródło:
Measurement Automation Monitoring; 2015, 61, 12; 532-534
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of spectral method for fatigue life assessment for non-gaussian random loads
Autorzy:
Niesłony, A.
Böhm, M.
Łagoda, T.
Cianetti, F.
Powiązania:
https://bibliotekanauki.pl/articles/387111.pdf
Data publikacji:
2016
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
spectral method
fatigue life
random loading
non-Gaussian
trwałość zmęczeniowa
metoda widmowa
stal
Opis:
The well-known problem with the fatigue lifetime assessment of non-Gaussian loading signals with the use of spectral method has been presented in the paper. A correction factors that transform the non-Gaussian signal into an equivalent Gaussian signal proposed by Bracessi et al. (2009) has been used for the purpose of lifetime calculations together with Palmgren-Miner Hypothesis. The calculations have been performed for the 10HNAP steel under random non-Gaussian load with four dominating frequencies. The signal has been generated on the test stand SHM250 for random tension-compression tests. The results with zero and non-zero mean stresses have been used to calculate the fatigue life with the frequency domain method based on Dirlik’s model and with a time domain method with the use of the rainflow cycle counting algorithm. The obtained calculation results have been compared with experimental results.
Źródło:
Acta Mechanica et Automatica; 2016, 10, 2; 100-103
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the GPC control quality using non-Gaussian statistical measures
Autorzy:
Domański, P. D.
Ławryńczuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/331090.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
control performance assessment
GPC control
non Gaussian PDF
Cauchy PDF
Lévy α-stable PDF
Opis:
This paper presents an alternative approach to the task of control performance assessment. Various statistical measures based on Gaussian and non-Gaussian distribution functions are evaluated. The analysis starts with the review of control error histograms followed by their statistical analysis using probability distribution functions. Simulation results obtained for a control system with the generalized predictive controller algorithm are considered. The proposed approach using Cauchy and Lévy α-stable distributions shows robustness against disturbances and enables effective control loop quality evaluation. Tests of the predictive algorithm prove its ability to detect the impact of the main controller parameters, such as the model gain, the dynamics or the prediction horizon.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 291-307
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimum dispersion coefficient criteria based positioning algorithm for BDS
Autorzy:
Wang, L.
Li, L.
Powiązania:
https://bibliotekanauki.pl/articles/141700.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alpha-stable distribution
BeiDou satellites
Kalman filter
minimum dispersion coefficient criteria
non-Gaussian noise
positioning algorithm
Opis:
The BeiDou navigation satellite system (BDS) is one of the four global navigation satellite systems. More attention has been paid to the positioning algorithm of the BDS. Based on the study on the Kalman filter (KF) algorithm, this paper proposed a novel algorithm for the BDS, named as the minimum dispersion coefficient criteria Kalman filter (MDCCKF) positioning algorithm. The MDCCKF algorithm adopts minimum dispersion coefficient criteria (MDCC) to remove the influence of noise with an alpha-stable distribution (ASD) model which can describe non-Gaussian noise effectively, especially for the pulse noise in positioning. By minimizing the dispersion coefficient of the positioning error, the MDCCKF assures positioning accuracy under both Gaussian and non-Gaussian environment. Compared with the original KF algorithm, it is shown that the MDCCKF algorithm has higher positioning accuracy and robustness. The MDCCKF algorithm provides insightful results for potential future research.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 739-753
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of joint signal detection and parameter estimation on the background of non-Gaussian noise
Autorzy:
Palahin, V.
Filipov, V.
Leleko, S.
Ivchenko, O.
Palahina, O.
Powiązania:
https://bibliotekanauki.pl/articles/122532.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
non-Gaussian noise
moment and cumulant representation of random variables
truncated stochastic polynom
polynomial solving rules
Opis:
The paper presents the results and describes the process of modeling of a system of joint signal detection and parameter estimation on the background of a non-Gaussian noise based on moment and cumulant description of random variables, polynomials of Kunchenko and moment quality criterion type of Neyman-Pearson.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 3; 87-94
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stochastic multivariable self-tuning tracker for non-Gaussian systems
Autorzy:
Filipovic, V.
Powiązania:
https://bibliotekanauki.pl/articles/908532.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
model ARMAX
statystyka odpornościowa
stabilność globalna
ARMAX model
self-tuning tracker
non-Gaussian noise
robust statistics
global stability
optimality
Opis:
This paper considers the properties of a minimum variance self-tuning tracker for MIMO systems described by ARMAX models. It is assumed that the stochastic noise has a non-Gaussian distribution. Such an assumption introduces into a recursive algorithm a nonlinear transformation of the prediction error. The system under consideration is minimum phase with different dimensions for input and output vectors. In the paper the concept of Kronecker’s product is used, which allows us to represent unknown parameters in the form of vectors. For parameter estimation a stochastic approximation algorithm is employed. Using the concept of the stochastic Lyapunov function, global stability and optimality of the feedback system are established.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2005, 15, 3; 351-357
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estymacja parametrów menzurandu dla danych z rozkładów niesymetrycznych metodą maksymalizacji wielomianu (PMM)
Estimation of measurand parameters for data from asymmetric distributions by polynomial maximization method (PMM)
Autorzy:
Warsza, Z. L.
Zabolotnii, S. W.
Powiązania:
https://bibliotekanauki.pl/articles/277748.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
estymator
rozkład niesymetryczny
wielomian stochastyczny
wartość średnia
wariancja
skośność
kurtoza
estimator
non-Gaussian model
stochastic polynomial
means value
variance
skewness
kurtosis
Opis:
Przedstawiono sposób wyznaczania estymatorów wartości i niepewności menzurandu niekonwencjonalną metodą maksymalizacji wielomianu stochastycznego (PMM) dla próbki danych pomiarowych pobranych z populacji modelowanej zmienną losową o rozkładzie niesymetrycznym. W metodzie PMM stosuje się statystykę wyższego rzędu i opis z użyciem momentów lub kumulantów. Wyznaczono wyrażenia analityczne dla estymatorów wartości i niepewności standardowej typu A menzurandu za pomocą wielomianu stopnia r = 2. Niepewność standardowa wartości menzurandu otrzymana metodą PPM zależy od skośności i kurtozy rozkładu. Jest ona mniejsza od średniej arytmetycznej wyznaczanej wg przewodnika GUM i bliższa wartości teoretycznej dla rozkładu populacji danych. Jeśli rozkład ten jest nieznany, to estymatory momentów i kumulantów wyznacza się z danych pomiarowych próbki. Sprawdzono skuteczność metody PMM dla kilku podstawowych rozkładów.
The non-standard method for evaluating estimators of the value and uncertainty type A for measurement data sampled from asymmetrical distributed with a priori partial description (unknown PDF) is presented. This method of statistical estimation is based on the mathematical apparatus of stochastic polynomials maximization and uses the higher-order statistics (moment & cumulant description) of random variables. The analytical expressions for finding estimates and analyze their accuracy to the degree of the polynomial r = 2 are obtained. It is shown that the uncertainty of estimates received for polynomial is generally less than the uncertainty of estimates obtained based on the mean (arithmetic average) according international guide GUM. Reducing the uncertainty of measurement depends on the skewness and kurtosis. On the basis of the Monte Carlo method carried out statistical modelling. Their results confirm the effectiveness of the proposed approach.
Źródło:
Pomiary Automatyka Robotyka; 2018, 22, 1; 49-56
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault monitoring and fault recovery control for position-moored vessels
Autorzy:
Fang, S.
Blanke, M.
Powiązania:
https://bibliotekanauki.pl/articles/907618.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
diagnostyka uszkodzeń
sterowanie tolerujące uszkodzenia
usuwanie błędu
wykrywanie zmian
fault diagnosis
fault tolerant control
fault recovery
position mooring
non Gaussian change detection
Opis:
This paper addresses fault-tolerant control for position mooring of a shuttle or floating production storage and offloading vessels. A complete framework for fault diagnosis is presented. A loss of a sub-sea mooring line buoyancy element and line breakage are given particular attention, since such failures might cause high-risk abortion of an oil-loading operation. With significant drift forces from waves, non-Gaussian elements dominate forces and the residuals designed for fault diagnosis. Hypothesis testing is designed using dedicated change detection for the type of distribution encountered. A new position recovery algorithm is proposed as a means of fault accommodation in order to keep the mooring system in a safe state, despite faults. The position control is shown to be capable of accommodating serious failures and preventing breakage of a mooring line, or a loss of a buoyancy element, from causing subsequent failures. Properties of the detection and fault-tolerant control algorithms are demonstrated by high fidelity simulations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 467-478
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of pulsed laser radiation on a thermoviscoelastic semi-infinite solid under two-temperature theory
Autorzy:
Othman, M. I.
Abouelregal, A. E. E.
Powiązania:
https://bibliotekanauki.pl/articles/240353.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
generalized thermo-visco-elasticity
two-temperature
Non-Gaussian laser pulse
laser intensity
phase lags
Kelvin-Voigt model
termolepkosprężystość
dwustopniowy
niegaussowski impuls laserowy
intensywność lasera
model Kelvina-Voigta
Opis:
The purpose of this paper is to study the thermoviscoelastic interactions in a homogeneous, isotropic semi-infinite solid under two-temperature theory with heat source. The Kelvin-Voigt model of linear viscoelasticity which describes the viscoelastic nature of the material is used. The bounding plane surface of the medium is subjected to a non-Gaussian laser pulse. The generalized thermoelasticity theory with dual phase lags model is used to solve this problem. Laplace transform technique is used to obtain the general solution for a suitable set of boundary conditions. Some comparisons have been shown in figures to estimate the effects of the phase lags, viscosity, temperature discrepancy, laser-pulse and the laser intensity parameters on all the studied fields. A comparison was also made with the results obtained in the case of one temperature thermoelasticity theory.
Źródło:
Archives of Thermodynamics; 2017, 38, 3; 77-99
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the propagation of partially coherent cosh-Gaussian beams through an ABCD optical system in non-Kolmogorov turbulence by effective tensor approach
Autorzy:
Ma, Hongjie
Li, Jinsong
Chen, Yueyang
Powiązania:
https://bibliotekanauki.pl/articles/1835756.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
partially coherent
cosh-Gaussian beam
ABCD optical system
non-Kolmogorov turbulence
Opis:
An efficient tensor approach is used to study the propagation of partially coherent cosh-Gaussian beams through an ABCD optical system in non-Kolmogorov turbulence. Analytical expressions for the average intensity of the beam propagation are derived. The properties of the average intensity are investigated with a numerical example. One finds that the propagation of the beam with larger spatial coherence length is less affected by distance when the propagation distance is long enough, and as the Ch-parameter increases, the beam propagation is less effected by turbulent atmosphere. It is also found that the average intensity distribution of the cosh-Gaussian beams with larger spatial correlation length is more affected by the structure constant of turbulence (i.e., turbulence level). By choosing a suitable Ch-parameter and spatial coherence length, the partially coherent cosh-Gaussian beams can be better transmitted in non-Kolmogorov turbulence. Our results will be useful in free-space communication.
Źródło:
Optica Applicata; 2021, 51, 1; 147-158
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Adaptive Richardson-Lucy Algorithm for Medical Image Restoration
Autorzy:
Yaqoub, Qunoot A.
Al-Ani, Ayad A.
Powiązania:
https://bibliotekanauki.pl/articles/2200960.pdf
Data publikacji:
2023
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
constraint least square filter
Gaussian blurring function
Gaussian noise function
inverse filter
non-blind deconvolution
point spread function
Richardson-Lucy algorithm
Wiener filter
Opis:
Image restoration is the process of estimating the original image content from a degraded picture. In this paper, the Richardson-Lucy iterative algorithm was developed to improve the quality of degraded medical images. It has been assumed that medical images are exposed to two types of degradation. The first type is the blur function in the Gaussian form with different widths, i.e. σ = 1 , 2, and 3. The second type of degradation was assumed to be of the independent white Gaussian noise type with different signal-to-noise ratio values: SNR = 10, 50 , and 100. The results obtained from the adaptive filter are compared, quantitatively, with different conventional filters: inverse, Wiener, and constraint least square, by applying different measures, such as: power signal to noise ratio (PSNR), structural similarity index (SSID), and root mean square error (RMSE). The comparison showed that the adaptive recovery filter achieves better results.
Źródło:
Journal of Telecommunications and Information Technology; 2023, 1; 66--77
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regelflächen vom Weingarten-Typ
Autorzy:
Stamou, Georg
Powiązania:
https://bibliotekanauki.pl/articles/965936.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Gaussian curvature of the second fundamental form II
non-developable ruled surfaces
II-mean curvature
Źródło:
Colloquium Mathematicum; 1999, 79, 1; 77-84
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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