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Tytuł:
Modeling and analysis of 12-pulse inverter in shipboard or aircraft
Autorzy:
Che, Y.
Zhou, J.
Liu, G.
Xu, J.
Zhao, Y.
Powiązania:
https://bibliotekanauki.pl/articles/260236.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
generalized state space averaging (GSSA)
state space averaging (SSA)
MATLAB
Opis:
With the development of DC distribution system within the isolated power system of a ship or an aircraft, more constant frequency loads will be supplied by inverters connected to DC main bus. In the operating mode conversion process of an isolated power system, inverters will inevitably suffer from serious disturbance and affect the stability of the system. Therefore, it is important to establish a model of the inverter that reflects its dynamic characteristics and based on which to conduct the stability analysis. This paper proposes a 12-pulse inverter model based on the generalized state space averaging (GSSA) method. This model can overcome the limitations of 12-pulse inverter state space averaging (SSA) model in transient analysis with good accuracy and fast analysis ability effectively. Three kinds of models for a 12-pulse aircraft inverter are built in MATLAB, namely GSSA model, SSA model and detail device model. The simulation results show the high accuracy of GSSA model in stability analysis. This study provides an effective analytical tool for stability analysis of 12-pulse inverter and also provides a reference for inverter modeling research of isolated power system such as in aircraft or ship.
Źródło:
Polish Maritime Research; 2017, S 3; 136-142
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The peculiarities of Space State Information Policy
Autorzy:
Rzhevska, Nina
Feshchenko, Anastasia
Powiązania:
https://bibliotekanauki.pl/articles/2137395.pdf
Data publikacji:
2022
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Chełmie
Tematy:
information policy
space state
space industry
information society
national information policy
information infrastructure
information resources
Opis:
The purpose of the article is to establish and research the features of space state information policy, which requires the following research tasks to be revealed: to determine the place and role of information policy in the structure of state policy and to establish the dependence of the state's information policy on the development of the space industry and to determine the features of the information policy of the USA as a space state. The USA forms its information policy based on knowledge of the use of advanced technologies, including information technologies, in the space industry. Knowing about the threats of their use, the state warns the population by regulating information activities. Therefore, the information policy of a space state is more developed than that of non-space states. An analysis of the relationship between the state of information policy and the state of the US space industry indicates that the development of one area aects the other. Therefore, in order to implement an eective information policy, both areas should be developed.
Źródło:
Language. Culture. Politics. International Journal; 2022, 1; 247-264
2450-3576
2719-3217
Pojawia się w:
Language. Culture. Politics. International Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification and Estimation of Initial Conditions in Non-Minimal State-Space Models
Autorzy:
Bystrov, Victor
Powiązania:
https://bibliotekanauki.pl/articles/2075239.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
identification
latent variables
state-space model
redundancy
Opis:
In this paper the identification problem is considered for initial conditions in a non-minimal state-space model that includes interpretable state variables generated by non-stationary stochastic processes. In order to solve the identification problem, structural restrictions are imposed on initial conditions in a state-space model with redundant state variables. The corresponding restricted maximum likelihood estimator of initial conditions is derived. The restricted estimator of initial conditions can be used in order to compute uniquely identified realizations of interpretable latent variables. The identification problem is illustrated analytically using a simple structural economic model
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2020, 4; 413-429
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Addressing the problem of lack of representativeness on syndromic surveillance schemes
Autorzy:
Natário, Isabel
Lucília Carvalho, M.
Powiązania:
https://bibliotekanauki.pl/articles/729974.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
syndromic surveillance
state space models
importance sampling
Opis:
A major concern with some contagious diseases has recently led to an enormous effort to monitor population health status by several different means.
This work presents a modeling approach to overcome this poor data characteristic, allowing its use for the estimation of the true population disease picture. We use a state space model, where we run two processes in parallel - a process describing the non observable states of the population concerning the presence/absence of disease, and an observational process resulting from the monitoring.
We then use resampling importance sampling estimation techniques, in a Bayesian framework, which enables us to estimate the population states and, thus, the corresponding disease incidence curves.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2009, 29, 2; 169-183
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards a target employment rate within age and gender groups
Autorzy:
Jaworski, Stanisław
Zielińska-Kolasińska, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/1917017.pdf
Data publikacji:
2021-12-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
employment rate
exponential smoothing
forecasting
state space approach
Opis:
Quarterly employment rates in European countries are analysed in terms of the likelihood of achieving a specific employment rate within age and gender groups in a five-year horizon. The German employment rate serves as a benchmark for this research. The likelihood is estimated by a Monte-Carlo simulation based on the class of exponential smoothing models. The research presents a pessimistic prognosis of employment rates in European countries with respect to young and partly to older workers.
Źródło:
Statistics in Transition new series; 2021, 22, 4; 213-225
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equivalence of control systems on the Euclidean group SE (2)
Autorzy:
Adams, R. M.
Biggs, R.
Remsing, C. C.
Powiązania:
https://bibliotekanauki.pl/articles/205696.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Left-invariant control system
state space equivalence
Euclidean group
Opis:
We classify, under (local) state space equivalence, all full-rank left-invariant control affne systems evolving on the Euclidean group SE(2).
Źródło:
Control and Cybernetics; 2012, 41, 3; 513-524
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized state space model and small signal stability analysis of Z-source converter
Autorzy:
Kouhanjani, Masoud Jokar
Soltani, Sina
Mardaneh, Mohammad
Powiązania:
https://bibliotekanauki.pl/articles/2202552.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
small signal stability
state space model
Z-source converter
Opis:
This paper proposes two nonlinear exact and simple state space models of a Zsource converter (ZSC) connected to an ac grid. A generic model of a ZSC accompanied with proper controllers are proposed and a dynamic model of the whole system is derived; as a result, based on a simple one, an equivalent block diagram of the current-controlled ZSC system is proposed. The ac small signal stability method is applied and the impact of controller parameters on network’s stability is discussed. Besides, overall system dynamic performance has been assessed in the event of perturbations. Time-domain simulations have been implemented in PSCAD/EMTDC to validate the accuracy of the models and effectiveness of the proposed controllers. The results of the exact model are compared with the response of the equations which are applied in MATLAB.
Źródło:
Archives of Electrical Engineering; 2023, 72, 1; 173--188
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using VARs and TVP-VARs with Many Macroeconomic Variables
Autorzy:
Koop, Gary
Powiązania:
https://bibliotekanauki.pl/articles/483265.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bayesian VAR
forecasting
time-varying coefficients
state-space model
Opis:
This paper discusses the challenges faced by the empirical macroeconomist and methods for surmounting them. These challenges arise due to the fact that macroeconometric models potentially include a large number of variables and allow for time variation in parameters. These considerations lead to models which have a large number of parameters to estimate relative to the number of observations. A wide range of approaches are surveyed which aim to overcome the resulting problems. We stress the related themes of prior shrinkage, model averaging and model selection. Subsequently, we consider a particular modelling approach in detail. This involves the use of dynamic model selection methods with large TVP-VARs. A forecasting exercise involving a large US macroeconomic data set illustrates the practicality and empirical success of our approach.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2012, 4, 3; 143-167
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The observational equivalence of natural and unnatural rates of interest
Autorzy:
Bystrov, Victor
Powiązania:
https://bibliotekanauki.pl/articles/1046640.pdf
Data publikacji:
2020
Wydawca:
Główny Urząd Statystyczny
Tematy:
natural rate of interest
state-space model
observational equivalence
Opis:
The results of the study presented in this paper demonstrate that a structural model of the natural interest rate, which is consistent with the standard assumptions of the natural rate theory, admits an interpretable, observationally equivalent representation in which a redefined, 'unnatural' equilibrium rate is different from the natural rate in the original model. The alternative representation was obtained by an invertible transformation implemented in the minimal state-space form of the natural-rate model. The identification theory for state-space models is used in the paper to prove the observational equivalence of these two representations. In the alternative representation, the equilibrium interest rate fails to meet the assumption of the natural rate theory, because it depends on past demand shocks. The alternative model, being observationally equivalent, has different implications for the conduct of monetary policy. The problem of observational equivalence arises in relation to natural-rate models because of the inherent unobservability of the natural interest rate; a potential solution to this problem could be the augmentation of the information set which is used to identify and estimate the natural rate.
Źródło:
Przegląd Statystyczny; 2019, 66, 3; 183-199
0033-2372
Pojawia się w:
Przegląd Statystyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Offset-free nonlinear Model Predictive Control with state-space process models
Autorzy:
Tatjewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/229638.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinear control
predictive control
offset-free control
state-space model
state estimation
Opis:
Offset-free model predictive control (MPC) algorithms for nonlinear state-space process models, with modeling errors and under asymptotically constant external disturbances, is the subject of the paper. The main result of the paper is the presentation of a novel technique based on constant state disturbance prediction. It was introduced originally by the author for linear state-space models and is generalized to the nonlinear case in the paper. First the case with measured state is considered, in this case the technique allows to avoid disturbance estimation at all. For the cases with process outputs measured only and thus the necessity of state estimation, the technique allows the process state estimation only - as opposed to conventional approach of extended process-and-disturbance state estimation. This leads to simpler design with state observer/filter of lower order and, moreover, without the need of a decision of disturbance placement in the model (under certain restrictions), as in the conventional approach. A theoretical analysis of the proposed algorithm is provided, under applicability conditions which are weaker than in the conventional approach. The presented theory is illustrated by simulation results of nonlinear processes, showing competitiveness of the proposed algorithms.
Źródło:
Archives of Control Sciences; 2017, 27, 4; 595-615
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and simulation aspects of AC machines
Autorzy:
Popp, M.
Laza, P.
Mathis, W.
Powiązania:
https://bibliotekanauki.pl/articles/141659.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
State Space Modeling
AC Machines
ODE and DAE Solvers
MATLAB
Opis:
In the field of power and drive systems, electrical AC machines are mostly modeled using a set of explicit ordinary differential equations in a state space representation. It is shown, that by using other equation types for simulation, algebraic constraints arising from aggregating several machines to a more complex system can directly be considered. The effects of different model variants on numerical ODE/DAE solvers are investigated in the focus of this work in order perform efficient simulations of larger systems possessing electrical AC machines.
Źródło:
Archives of Electrical Engineering; 2016, 65, 2; 315-326
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decision theory under general uncertainty
Autorzy:
Cui, Y.
Guo, R.
Dunne, T.
Guo, D.
Powiązania:
https://bibliotekanauki.pl/articles/2069606.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
statistical decision
state space
action space
uncertain measure
loss function
risk
uncertainty decision
Opis:
The exposure of Toyota management’s cover-up of its faulty car component problems raises a fundamental question: did Toyota management make an appropriate decision taking all uncertainties into account? Statistical decision theory is a framework with a probabilistic foundation, which admits random uncertainty about the real world and human thinking. In general, the uncertainty of the real world is diversified and therefore the effort of trying to deal with different forms of uncertainty with one special form of uncertainty, namely random uncertainty, may be oversimplified. In this paper, we introduce an axiomatic uncertain measure theoretical framework and explore the essential mechanism in formulating a general uncertainty decision theory. We expect that a new understanding of uncertainty and development of a corresponding new uncertainty decision-making approach may assist intelligence communities to survive and deal with the extremely tough and diverse aspects of an uncertain reality.
Źródło:
Journal of Polish Safety and Reliability Association; 2010, 1, 1; 51--66
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An importance measure for multi-component systems with Semi-Markov dynamics
Autorzy:
Hellmich, M.
Berg, H. P.
Powiązania:
https://bibliotekanauki.pl/articles/2069417.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
multi-component system
importance measure
Semi-Markov process
state space model
Opis:
We consider semi-Markov reliability models of multi-component systems with a discrete state space, general enough to include systems with maintenance or repair. We assume that for all system states the functioning or failure of each component is specified. In this setup we propose a component importance measure which is close in spirit to the classical steady state Barlow–Proschan importance measure for repairable binary coherent systems. We discuss our importance measure to some extent, highlighting the relation to the classical Barlow–Proschan measure, and present formulas expressing it in terms of quantities easily obtained from the building blocks of the semi-Markov process. Finally an example of a two-component cold standby system with maintenance and repair is presented which illustrates how our importance measure can be used in practical applications.
Źródło:
Journal of Polish Safety and Reliability Association; 2012, 3, 1; 147--156
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional Kalman Filter algorithms for correlated system and measurement noises
Autorzy:
Sierociuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/206137.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
fractional order calculus
discrete fractional state-space systems
fractional Kalman filter
Opis:
The paper presents a generalization of the Fractional Kalman Filter to a case when correlated system and measurement noises appear. The algorithm proposed is derived in detail for a linear generalized discrete fractional order state-space system for both constant and variable order cases. In order to present the efficiency of the proposed algorithm, results of numerical simulations are presented. Results of numerical experiments are compared with the effect of estimation obtained when using the traditional Fractional Kalman Filter algorithm.
Źródło:
Control and Cybernetics; 2013, 42, 2; 471-490
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy adaptation in a state space controller applied for a two-mass system
Autorzy:
Żychlewicz, M.
Kamiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1193391.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fuzzy gain scheduling
state space controller
gains adaptation
two-mass drive
Opis:
Application of a state space controller for two-mass system has been examined. However, the classical version of the controller was modified in order to improve properties of the whole system. For this purpose fuzzy model was implemented as an adaptation element for the parameters. The theoretical description of the control structure, numerical tests and experimental results (using dSPACE1103 card) have been presented.
Źródło:
Power Electronics and Drives; 2017, 2, 37/1; 135-150
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Petri nets state space reduction using dynamic programming
Autorzy:
Popova-Zeugmann, L.
Powiązania:
https://bibliotekanauki.pl/articles/970865.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
programowanie dynamiczne
time Petri net
dynamic programming
state space reduction
integer state
reachability graph
Opis:
In this paper a parametric description for the state space of an arbitrary TPN is given. An enumerative procedure for reducing the state space is introduced. The reduction is defined as a truncated multistage decision problem and solved recursively. A reachability graph is denned in a discrete way by using the reachable integer-states of the TPN.
Źródło:
Control and Cybernetics; 2006, 35, 3; 721-748
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Markov State Space Aggregation via the Information Bottleneck Method
Autorzy:
Geiger, Bernhard C.
Powiązania:
https://bibliotekanauki.pl/articles/1373624.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Markov chains
state space aggregation
coarse-graining
information bottleneck
relative entropy
lumpability
Opis:
Consider the problem of approximating a Markov chain by another Markov chain with a smaller state space that is obtained by partitioning the original state space. An information-theoretic cost function is proposed that is based on the relative entropy rate between the original Markov chain and a Markov chain defined by the partition. The state space aggregation problem can be sub-optimally solved by using the information bottleneck method.
Źródło:
Schedae Informaticae; 2014, 23; 45-56
0860-0295
2083-8476
Pojawia się w:
Schedae Informaticae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hourly identification and simulation of the TGE S.A. Day-Ahead Market system
Autorzy:
Marlęga, Radosław
Tchórzewski, Jerzy R.
Powiązania:
https://bibliotekanauki.pl/articles/31342745.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
equations of state
control system
Day-Ahead Market
identification
Polish Electricity Exchange
simulation
state space
Opis:
The paper presents selected research results concerning the identification and simulation of the TGE S.A. Day-Ahead Market (DAM) system of the day for electricity delivered and sold, listed for the following hours: 5:01-6:00, 11:01-12:00, 17:01-18:00 and 23:01-24:00 in 2019, which were obtained in the MATLAB and Simulink environment using the System Identification Toolbox. As a result of identification, four respective discrete parametric arx models were obtained, which were then subject to quality assessment. Then, a simulation model was built in the Simulink environment, which was used for simulation tests and for assessing the sensitivity of the model created using the data from 2019 as the basis and the data from 2020 for verification. The obtained results confirm the correctness of both the performed discrete parametric identification and the possibility of testing the quality of the model and its sensitivity with the use of the DAM system model in the MATLAB and Simulink environment.
Źródło:
Control and Cybernetics; 2022, 51, 4; 523-555
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control of dynamic systems using a new adjoining cell mapping method with reinforcement learning
Autorzy:
Arribas-Navarro, T.
Prieto, S.
Plaza, M.
Powiązania:
https://bibliotekanauki.pl/articles/205725.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
cells mapping
state space
reinforcement learning
stability
nonlinear control
controllability
Opis:
This work aims to improve and simplify the procedure used in the Control Adjoining Cell Mapping with Reinforcement Learning (CACM-RL) technique, for the tuning process of an optimal contro ller during the pre-learning stage (controller design), making easier the transition from a simulation environment to the real world. Common problems, encountered when working with CACM-RL, are the adjustment of the cell size and the long-term evolution error. In this sense, the main goal of the new approach, developed for CACM-RL that is proposed in this work (CACMRL*), is to give a response to both problems for helping engineers in defining of the control solution with accuracy and stability criteria instead of cell sizes. The new approach improves the mathematical analysis techniques and reduces the engineering effort during the design phase. In order to demonstrate the behaviour of CACM-RL*, three examples are described to show its application to real problems. In All the examples, CACM-RL* improves with respect to the considered alternatives. In some cases, CACM- RL* improves the average controllability by up to 100%.
Źródło:
Control and Cybernetics; 2015, 44, 3; 369-387
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A general solution to the output-zeroing problem for MIMO LTI systems
Autorzy:
Tokarzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/907995.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
informatyka
linear multivariable systems
state-space methods
output-zeroing problem
invariant zeros
Opis:
The problem of zeroing the output in an arbitrary linear continuous-time system S(A,B,C,D) with a nonvanishing transfer function is discussed and necessary conditions for output-zeroing inputs are formulated. All possible real-valued inputs and real initial conditions which produce the identically zero system response are characterized. Strictly proper and proper systems are discussed separately.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 2; 161-171
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-variant model of heat-and-mass exchange for steam humidifier
Niestacjonarny model wymiany ciepła i masy dla nawilżacza parowego
Autorzy:
Golinko, Igor
Drevetskiy, Volodymyr
Powiązania:
https://bibliotekanauki.pl/articles/408430.pdf
Data publikacji:
2020
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
dynamical model
state space
steam humidifier
model dynamiczny
przestrzeń stanu
nawilżacz parowy
Opis:
The dynamical model of heat-mass exchange for a steam humidifier with lumped parameters, which can be used for synthesis of control systems by inflowing-exhaust ventilation installations, or industrial complexes of artificial microclimate, is considered. A mathematical description that represents the dynamical properties of a steam humidifier concerning the main channels of control and perturbation is presented. Numerical simulation of transient processes for the VEZA KCKP-20 humidification chamber to the influence channels was carried out. The achieved dynamical model of a humidification chamber can be the basis for the synthesis of automatic control systems and simulation of transient states. A significant advantage of the obtained mathematical model in the state space is the possibility of synthesis and analysis of a multidimensional control system.
Rozważono model dynamiczny wymiany ciepła i masy nawilżacza parowego o parametrach skupionych, który można zastosować do syntezy układów sterowania przez instalacje wentylacyjne nadmuchowo-wywiewne lub przemysłowe kompleksy sztucznego mikroklimatu. Przedstawiono opis matematyczny przedstawiający właściwości dynamiczne nawilżacza parowego dotyczące głównych kanałów regulacji i zaburzeń. Przeprowadzono symulację numeryczną procesów przejściowych dla komory nawilżającej VEZA KCKP-20 z kanałami wpływowymi. Powstały model dynamiczny komory nawilżania może być podstawą do syntezy automatycznych układów sterowania i symulacji stanów nieustalonych. Istotną zaletą uzyskanego modelu matematycznego w przestrzeni stanu jest możliwość syntezy i analizy wielowymiarowego układu sterowania.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2020, 10, 2; 24-27
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positive realizations with reduced numbers of delays for 2D continuous-discrete linear systems
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/201699.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computation
linear
2D continuous-discrete
delay
state-space realization
sufficient conditions
Opis:
A new method is proposed for determination of positive realizations with reduced numbers of delays of linear 2D continuousdiscrete systems. Sufficient conditions for the existence of the positive realizations of a given proper transfer function are established. It is shown that there exists a positive realization with reduced numbers of delays if there exists a positive realization without delays but with a greater dimension. The proposed method is demonstrated on a numerical example.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 835-840
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring the Natural Rates of Interest in Germany and Italy
Autorzy:
Bystrov, Victor
Powiązania:
https://bibliotekanauki.pl/articles/2076225.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
natural rate of interest
potential output
euro area
state-space model
Kalman filter
Opis:
In this paper a semi-structural econometric model is implemented in order to estimate the natural rates of interest in two large economies of the Euro Area: Germany an Italy. The estimates suggest that after the financial crisis of 2007–2008 a decrease of the growth rate of potential output and the corresponding natural rate of interest was greater in Italy than in Germany which could have had important implications for the effectiveness of a common monetary policy. Unlike in other studies, it is found that the monetary policy stance was less expansionary in Italy as compared to Germany for the whole after-crisis period.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2018, 4; 333-353
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An integer optimization model and algorithms to support the cost-revenue study and provisory designing warehouses or other storage objects
Autorzy:
Miatselski, M.
Staruch, B.
Powiązania:
https://bibliotekanauki.pl/articles/298439.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
warehouse design
cost-revenue recognition
state space
model
algorithm
nonlinear programming
integer programming
Opis:
An optimization model for the cost–revenue study at the stage of system analysis and preliminary designs of storage objects such as warehouses, containers, packs and similar objects are developed. Our assumptions motivated by warehouses design lead us to a nonlinear integer optimization problem with the only basic constraint. We present algorithmic methods for obtaining the exact solution to the general problem with emphasizing the special case when both the objective and the constraint functions are increasing. The results of the paper may be used in developing software tools intended for supporting designers.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(4); 257-269
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Hall current in thermoelastic materials with double porosity structure
Autorzy:
Kumar, R.
Vohra, R.
Powiązania:
https://bibliotekanauki.pl/articles/265351.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Hall current
double porosity
thermoelasticity
state space approach
thermomechanical sources
porowatość
termoelastyczność
termomechanika
Opis:
The present investigation is concerned with one dimensional problem in a homogeneous, isotropic thermoelastic medium with double porosity structure in the presence of Hall currents subjected to thermomechanical sources. A state space approach has been applied to investigate the problem. As an application of the approach, normal force and thermal source have been taken to illustrate the utility of the approach. The expressions for the components of normal stress, equilibrated stress and the temperature change are obtained in the frequency domain and computed numerically. A numerical simulation is prepared for these quantities. The effect of the Hartmann number is depicted graphically on the resulting quantities for a specific model. Some particular cases of interest are also deduced from the present investigation.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 303-319
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Autocovariance and Linear Transformations of Markov Switching VARMA Processes
Autorzy:
Cavicchioli, Maddalena
Powiązania:
https://bibliotekanauki.pl/articles/2076570.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
time series
multivariate ARMA
state-space models
Markovchains
changes in regime
autocovariance
linear representations
Opis:
We study the autocovariance structure of a general Markov switching second-order stationary VARMA model. Then we give stable finite order VARMA(p∗, q∗) representations for those M-state Markov switching VARMA(p, q) processes where the observables are uncorrelated with the regime variables. This allows us to obtain sharper bounds for p∗and q∗ with respect to the ones existing in literature. Our results provide new insights into stochastic properties and facilitate statistical inference about the orders of MS-VARMA models and the underlying number of hidden states
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2014, 4; 275-289
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On approximations of nonzero-sum uniformly continuous ergodic stochastic games
Autorzy:
Nowak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1338847.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Nash equilibrium
general state space
nonzero-sum Markov game
long run average reward criterion
Opis:
We consider a class of uniformly ergodic nonzero-sum stochastic games with the expected average payoff criterion, a separable metric state space and compact metric action spaces. We assume that the payoff and transition probability functions are uniformly continuous. Our aim is to prove the existence of stationary ε-equilibria for that class of ergodic stochastic games. This theorem extends to a much wider class of stochastic games a result proven recently by Bielecki [2].
Źródło:
Applicationes Mathematicae; 1999, 26, 2; 221-228
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State - space control of the drive with PMSM and flexible coupling
Układ sterowania napędu z PMSM i elastycznym sprzęgłem
Autorzy:
Vittek, J.
Makys, P.
Pospisil, M.
Szychta, E.
Luft, M.
Powiązania:
https://bibliotekanauki.pl/articles/224343.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
układ sterowania
algorytm sterowania
sprzęgło elastyczne
control systems
control vector algorithm
state-space control
Opis:
A control system, which achieves prescribed speed and position responses, for electric drives with a significant torsion vibration mode is presented. Control system design exploits state-space control and forced dynamics control principles. Derived control algorithm respects the vector control condition by keeping the direct axis current component approximately zero as well as controlling the load position with prescribed closed loop dynamics. Set of two observers, one on load side and the second one on motor side, generate all state variables necessary for control algorithm design including torques acting on the motor and load side to satisfy all conditions for achieving prescribed dynamics. This approach eliminates the position sensor on motor side. The simulations confirm that proposed model based position control system can operate with moderate accuracy.
W artykule zaprezentowano układ sterowania napędami elektrycznymi ze znacznymi drganiami skrętnymi, który umożliwia jako odpowiedzi - określone obroty i położenie. Układ sterowania wykorzystuje opis przestrzeni stanu i zasady wymuszonego sterowania dynamicznego. Zestaw dwóch obserwatorów, jeden po stronie obciążenia, a drugi od strony silnika, wygenerować może wszystkie zmienne stanu niezbędne do projektowania algorytmu sterowania, w tym momenty działające po stronie silnika i obciążenia, spełniające wszystkie warunki niezbędne do osiągnięcia określonej dynamiki. Takie podejście eliminuje stosowanie czujnika położenia od strony silnika. Wyniki symulacji potwierdzają, że proponowany model układu sterowania położenia może pracować z wystarczającą dokładnością.
Źródło:
Archives of Transport; 2011, 23, 1; 77-90
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlocal state-space strain gradient approach to the vibration of piezoelectric functionally graded nanobeam
Autorzy:
Selvamani, Rajendran
Loganathan, Rubine
Ebrahimi, Farzad
Powiązania:
https://bibliotekanauki.pl/articles/38888768.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
wave propagation
functionally graded materials
FGMs
nonlocal strain gradient
state-space theory
piezoelectric nanobeam.
Opis:
In this work, the state-space nonlocal strain gradient theory is used for the vibration analysis of piezoelectric functionally graded material (FGM) nanobeam. Power law relations are used to describe the computing analysis of FGM constituent properties. The refined higherorder beam theory and Hamilton’s principle are used to obtain the equations of motion of the piezoelectric nanobeam. Besides, the governing equations of the piezoelectric nanobeam are extracted by the developed nonlocal state-space theory, and the analytical wave dispersion method is used to solve wave propagation problems. The real and imaginary solutions for wave frequency, loss factor and wave number are obtained and presented in graphs.
Źródło:
Engineering Transactions; 2022, 70, 4; 319-338
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sturm-Liouville Systems Are Riesz-Spectral Systems
Autorzy:
Delattre, C.
Dochain, D.
Winkin, J.
Powiązania:
https://bibliotekanauki.pl/articles/908100.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
matematyka
Sturm-Liouville system
Riesz-spectral system
infinite-dimensional state-space system
Co-semigroup
Opis:
The class of Sturm-Liouville systems is defined. It appears to be a subclass of Riesz-spectral systems, since it is shown that the negative of a Sturm-Liouville operator is a Riesz-spectral operator on L2(a,b) and the infinitesimal generator of a C0-semigroup of bounded linear operators.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 4; 481-484
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of two-wheeled self-balancing robot driven by DC gearmotors
Autorzy:
Frankovsky, P.
Dominik, L.
Gmiterko, A.
Virgala, I.
Kurylo, P.
Perminova, O.
Powiązania:
https://bibliotekanauki.pl/articles/266201.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
self-balancing robot
inverted pendulum
DC gearmotor
state space model
robot
wahadło odwrócone
motoreduktor
Opis:
This paper is aimed at modelling a two-wheeled self-balancing robot driven by the geared DC motors. A mathematical model consists of two main parts, the model of robot’s mechanical structure and the model of the actuator. Linearized equations of motion are derived and the overall model of the two-wheeled self-balancing robot is represented in state-space realization for the purpose of state feedback controller design.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 739-747
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State-space model and implementation Polish Power Exchange in Matlab and Simulnk environments
Autorzy:
Marlęga, R.
Powiązania:
https://bibliotekanauki.pl/articles/94817.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
simulation research
parametric model
identification modeling
Matlab environment
Simulink environment
Business Intelligence
BI
state space
Opis:
This work contains selected results of research on modelling identification of Polish Power Exchange (TGEE) on the example of the figures quoted on the Day Ahead Market (DAM) on TGEE in Poland. In order to obtain a model of the TGEE system on the beginning it was conducted to identify the figures for the period 01.01.2013-31.12.2015 obtaining discrete parametric model arx in MATLAB and Simulink environments using System Identification Toolbox (SIT). The resultant model was converted to a continuous parametric model, and that one on a continuous model in the state space. On the basis of obtained equations of state and outputs, there was interpreted a state variables and parameters of the selected model, i.e. selected elements of the matrix A and matrix B. Research continues.
Źródło:
Information Systems in Management; 2017, 6, 4; 294-308
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LABOUR MARKET FLEXIBILITY OF POLISH PROVINCES IN TERMS OF JOB-FINDING AND JOB-SEPARATION RATES
Autorzy:
Jaworski, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/453249.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
unemployment rate
Poisson process
local polynomial fitting
state-space models
stock-flow model of unemployment
Opis:
The purpose of this paper is to examine labour market flexibility for a set of Polish provinces. Particularly, labour market inequalities among Polish provinces are analysed indirectly in terms of labour force flows. The text is based on the results conducted with a structural time series model and a stock-flow model of unemployment.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2016, 17, 4; 59-68
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing the possibilities in visualisation of the ferroresonance phenomenon
Autorzy:
Klimas, Maciej
Majka, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/376677.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
ferroresonance
Power System
ferromagnetic core coil
measurements
state space and plane representation of dynamical systems
Opis:
Waveforms measured and recorded in a ferroresonant circuit are the base for many computations, including simulation of ferroresonance circuit over - current/voltage responses and modelling a nonlinear coil. During such a study of ferroresonance phenomenon, the time dependent nonlinear differential equations are derived from R – Ψ(i) – C ferroresonant circuit. The system of nonlinear equations is numerically solved using various algorithm applications. In applied mathematics, in particular the context of the nonlinear dynamical systems analysis, phase – plane/space graphs are a visual display of certain characteristics of kinds of differential equations. The aim of the paper is a full plane/space presentation of all possible states of a test circuit when the ferroresonance occurs. Poincare maps application is also mentioned in the paper.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 98; 115-124
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliable robust path planning with application to mobile robots
Autorzy:
Pepy, R.
Kieffer, M.
Walter, E.
Powiązania:
https://bibliotekanauki.pl/articles/930096.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza interwałowa
planowanie trajektorii
sterowanie odporne
interval analysis
path planning
robust control
state-space models
Opis:
This paper is devoted to path planning when the safety of the system considered has to be guaranteed in the presence of bounded uncertainty affecting its model. A new path planner addresses this problem by combining Rapidly-exploring Random Trees (RRT) and a set representation of uncertain states. An idealized algorithm is presented first, before a description of one of its possible implementations, where compact sets are wrapped into boxes. The resulting path planner is then used for nonholonomic path planning in robotics.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 3; 413-424
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State Space-Based Method for the DOA Estimation by the Forward-Backward Data Matrix Using Small Snapshots
Autorzy:
Liu, J.
Powiązania:
https://bibliotekanauki.pl/articles/227085.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
state space-based method
DOA estimation
small snapshots
array signal
antenna elements
forward-backward data Matrix
Opis:
In this presentation, a new low computational burden method for the direction of arrival (DOA) estimation from noisy signal using small snapshots is presented. The approach introduces State Space-based Method (SSM) to represent the received array signal, and uses small snapshots directly to form the Hankel data matrix. Those Hankel data matrices are then utilized to construct forward-backward data matrix that is used to estimate the state space model parameters from which the DOA of the incident signals can be extracted. In contrast to existing methods, such as MUSIC, Root-MUSIC that use the covariance data matrix to estimate the DOA and the sparse representation (SR) based DOA which is obtained by solving the sparsest representation of the snapshots, the SSM algorithm employs forward-backward data matrix formed only using small snapshots and doesn't need additional spatial smoothing method to process coherent signals. Three numerical experiments are employed to compare the performance among the SSM, Root-MUSIC and SR-based method as well as Cramér–Rao bound (CRB). The simulation results demonstrate that when a small number of snapshots, even a single one, are used, the SSM always performs better than the other two method no matter under the circumstance of uncorrelated or correlated signal. The simulation results also show that the computational burden is reduced significantly and the number of antenna elements is saved greatly.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 3; 315-322
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonzero-sum semi-Markov games with countable state spaces
Autorzy:
Połowczuk, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/1208131.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
discounted criterion
Nash equilibrium
countable state space
nonzero-sum semi-Markov game
long run average reward criterion
Opis:
We consider nonzero-sum semi-Markov games with a countable state space and compact metric action spaces. We assume that the payoff, mean holding time and transition probability functions are continuous on the action spaces. The main results concern the existence of Nash equilibria for nonzero-sum discounted semi-Markov games and a class of ergodic semi-Markov games with the expected average payoff criterion.
Źródło:
Applicationes Mathematicae; 2000, 27, 4; 395-402
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive prediction of stock exchange indices by state space wavelet networks
Autorzy:
Brdyś, M. A.
Borowa, A.
Idźkowiak, P.
Brdyś, M. T.
Powiązania:
https://bibliotekanauki.pl/articles/907656.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
prognozowanie
giełda
sztuczna inteligencja
wyżarzanie symulowane
forecasting
stock exchange
artificial intelligence
state space wavelet network
simulated annealing
Opis:
The paper considers the forecasting of the Warsaw Stock Exchange price index WIG20 by applying a state space wavelet network model of the index price. The approach can be applied to the development of tools for predicting changes of other economic indicators, especially stock exchange indices. The paper presents a general state space wavelet network model and the underlying principles. The model is applied to produce one session ahead and five sessions ahead adaptive predictors of the WIG20 index prices. The predictors are validated based on real data records to produce promising results. The state space wavelet network model may also be used as a forecasting tool for a wide range of economic and non-economic indicators, such as goods and row materials prices, electricity/fuel consumption or currency exchange rates.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 337-348
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the realization theory of polynomial matrices and the algebraic structure of pure generalized state space systems
Autorzy:
Vardulakis, A. I. G.
Karampetakis, N. P.
Antoniou, E. N.
Tictopoulou, E.
Powiązania:
https://bibliotekanauki.pl/articles/907853.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
macierz wielomianowa
nierozkładalność
przestrzeń stanu
polynomial matrices
realization theory
minimality
irreducibility
generalized state space
infinite decoupling zeros
Opis:
We review the realization theory of polynomial (transfer function) matrices via 'pure' generalized state space system models. The concept of an irreducible-at-infinity generalized state space realization of a polynomial matrix is defined and the mechanism of the 'cancellations' of 'decoupling zeros at infinity' is closely examined. The difference between the concepts of irreducibility and minimality of generalized state space realizations of polynomial (transfer function) matrices is pointed out and the associated concepts of dynamic and non-dynamic variables appearing in generalized state space realizations are also examined.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 1; 77-88
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Grey Wolf Optimizer in the optimization of state space controller for three-mass drive
Autorzy:
Żychlewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1189934.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
GWO
regulator stanu
układ trójmasowy
napęd elektryczny
Grey Wolf Optimizer
state space controller
three-mass system
electrical drive
Opis:
This article presents control structure of complex drive that contains two elastic couplings. In the outer control loop the state space controller was implemented. The main point of described work is optimization of parameters used in this part of the drive using metaheuristic algorithm called GWO (Grey Wolf Optimizer). The control structure, designed using mentioned optimization method, was compared to classic solution, known from control theory. High precision of reference speed tracking was achieved. An analysis of the system in the presence of mechanical parameters changes was also prepared. Theoretical considerations were confirmed in numerical tests.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2018, 6, 1; 12--20
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some remarks on equilibria in semi-Markov games
Autorzy:
Nowak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1208130.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
correlated equilibrium
Nash equilibrium
general state space
nonzero-sum semi-Markov game
long run expected average payoff criterion
Opis:
This paper is a first study of correlated equilibria in nonzero-sum semi-Markov stochastic games. We consider the expected average payoff criterion under a strong ergodicity assumption on the transition structure of the games. The main result is an extension of the correlated equilibrium theorem proven for discounted (discrete-time) Markov games in our joint paper with Raghavan. We also provide an existence result for stationary Nash equilibria in the limiting average payoff semi-Markov games with state independent and nonatomic transition probabilities. A similar result was proven for discounted Markov games by Parthasarathy and Sinha.
Źródło:
Applicationes Mathematicae; 2000, 27, 4; 385-394
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disturbance modeling and state estimation for offset-free predictive control with state-space process models
Autorzy:
Tatjewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/330146.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
model predictive control
state space model
disturbance rejection
state observer
Kalman filter
sterowanie predykcyjne
model przestrzeni stanów
eliminacja zakłóceń
obserwator stanu
filtr Kalmana
Opis:
Disturbance modeling and design of state estimators for offset-free Model Predictive Control (MPC) with linear state-space process models is considered in the paper for deterministic constant-type external and internal disturbances (modeling errors). The application and importance of constant state disturbance prediction in the state-space MPC controller design is presented. In the case with a measured state, this leads to the control structure without disturbance state observers. In the case with an unmeasured state, a new, simpler MPC controller-observer structure is proposed, with observation of a pure process state only. The structure is not only simpler, but also with less restrictive applicability conditions than the conventional approach with extended process-and-disturbances state estimation. Theoretical analysis of the proposed structure is provided. The design approach is also applied to the case with an augmented state-space model in complete velocity form. The results are illustrated on a 2 x 2 example process problem.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 2; 313-323
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limitations in the airspace sovereignty of states in connection with space activity
Autorzy:
Polkowska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/576363.pdf
Data publikacji:
2018-09-20
Wydawca:
Akademia Sztuki Wojennej
Tematy:
sovereignty
space
state
space law
boundary
Opis:
The launch of the Soviet Sputnik in 1957 resulted in the emergence of two legal concepts concerning spaceflight. The first of them concerned harmless passage through airspace subjected to the sovereignty of states, the second - recognition that at the height of the trajectory of a passage, space is no longer subject to the sovereignty of states (res omnium communis). In both cases, we are dealing with limiting the sovereignty of states. These issues have not been resolved to this day. The practice of spaceflight has confirmed the freedom of spaceflight, although it has not resolved the issue of the upper limit of airspace. It is worth emphasising, however, that the decisive factor for the development of space law was the customary law that arose in 1957, because states did not protest and tacitly accepted the principle of a harmless flight.
Źródło:
Security and Defence Quarterly; 2018, 20, 3; 42-56
2300-8741
2544-994X
Pojawia się w:
Security and Defence Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Space as a New Category of Threats to National Security
Autorzy:
BIELAWSKI, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/466208.pdf
Data publikacji:
2019
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
space
threats
space law
state security
Opis:
The scientific considerations presented in this paper concern threats to national security arising from the activity in outer space. The objective of this analysis is to identify these dangers and to propose solutions to minimize them. The theoretical research methods employed in this study are: synthesis, analysis, abstracting and generalization. In the course of the analysis, several modern threats were established, including anti-satellite and hypersonic weapons. Another important sphere discussed in the paper is the cyber security of satellite/communication devices and systems operating in space. With respect to satellite systems, the EA-18G Growler electronic warfare aircraft was presented as one of the concepts developed with the capability of disrupting their operation. The results from the conducted study emphasize the need to create a Space Domain Awareness (SDA) system, which is substantiated by the indication of natural threats that must beminimized, namely space debris, space weather and the possibility of collision with Near-Earth Objects. The presented considerations are concluded by the analysis of the legislative state regarding space security, which in reality accentuate the incompatibility of the existing laws with the emerging threats, and other issues concerning space law.
Źródło:
Safety & Defense; 2019, 5, 2; 1-7
2450-551X
Pojawia się w:
Safety & Defense
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static instability of an inverted plate in channel flow: state-space representation and solution approximation
Autorzy:
Li, P.
Zhang, D.
Cui, J.
Yin, H.
Yang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/38697113.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
inverted cantilevered plate
static aeroelastic instability
channel flow
state-space representation
Glauert’s series
the least squares method
Opis:
Plate-like structures in channel flow are commonly found in engineering. This paper reports a theoretical study on the static aeroelastic instability of an inverted cantilevered plate in an inviscid channel flow through the state space. This study begins with the kernel function of the flow potential determined in the Fourier domain with the help of the mirror image method. Then, the instability equation is derived from the operator theory and transformed in the state space. Finally, with Glauert’s expansion, model functions, and error functions, the instability problem of such a plate has been modeled as a mathematical function approximation problem and solved by the least squares method. The derived instability equation is considered at the continuum level of description, and no approximation appears at the first equation level. The convergence and reliability of the proposed modeling and its solutions approximation are entirely tested, and it can successfully predict the instability boundary, behavior, and the channel effect. Numerical results show that the decreased channel height and asymmetric plate placement in the channel significantly decrease the critical flow velocity. The plate instability modes are close to the plate’s first natural ones and not sensitive to the channel parameters. This conclusion allows further theoretical exploration of a semi-analytical approximation of the instability boundary from the obtained instability equation. The current modeling strategy in a continuum sense may provide a new idea and essential reference for other instability problems.
Źródło:
Archives of Mechanics; 2023, 75, 6; 695-727
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observability and controllability analysis for sandwich systems with backlash
Autorzy:
Luo, N.
Tan, Y.
Dong, R.
Powiązania:
https://bibliotekanauki.pl/articles/330501.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
backlash
sandwich system
non smooth system
state space equation
observability
controllability
luz mechaniczny
układ warstwowy
równanie stanu
obserwowalność
sterowalność
Opis:
In this paper, an approach to analyze the observability and controllability of sandwich systems with backlash is proposed. In this method, a non-smooth state-space function is used to describe the sandwich systems with backlash which are also non-smooth non-linear systems. Then, a linearization method based on non-smooth optimization is proposed to derive a linearized state-space function to approximate the non-smooth sandwich systems within a bounded region around the equilibrium point that we are interested in. Afterwards, both observability and controllability matrices are constructed and the methods to analyze the observability as well as controllability of sandwich system with backlash are derived. Finally, numerical examples are presented to validate the proposed method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 4; 803-814
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controllability and observability of linear discrete-time fractional-order systems
Autorzy:
Guermah, S.
Djennoune, S.
Bettayeb, M.
Powiązania:
https://bibliotekanauki.pl/articles/907951.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
modelowanie systemu
osiągalność
gramian sterowalności
gramian obserwowalności
system modeling
discrete fractional state-space systems
reachability
controllability and observability gramians
Opis:
In this paper we extend some basic results on the controllability and observability of linear discrete-time fractional-order systems. For both of these fundamental structural properties we establish some new concepts inherent to fractional-order systems and we develop new analytical methods for checking these properties. Numerical examples are presented to illustrate the theoretical results.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2008, 18, 2; 213-222
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identyfikacja dyskretnego liniowego systemu powtarzalnego metodami podprzestrzeni
Deterministic subspace identification of a linear repetitive process
Autorzy:
Kujawa, D.
Powiązania:
https://bibliotekanauki.pl/articles/154294.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
modele w przestrzeni stanów
metody podprzestrzeni
algorytmy identyfikacji
estymacja parametrów
state space models
subspace methods
identification algorithms
parameter estimation
Opis:
W artykule przedstawiono model procesu repetycyjnego zbudowany przy wykorzystaniu metod podprzestrzenii. Rząd systemu i macierze nieznanego systemu są wyznaczane z sekwencji danych wejściowych i wyjściowych aktualnego pasa i sekwencji wyjściowej poprzedniego pasa. Procedura identyfikacji może być powtarzana dla kolejnych pasów. Proponowane podejście może być użyteczne nie tylko dla identyfikacji stacjonarnych liniowych procesów powtarzalnych, ale także dla procesów z wolno ewoluującą dynamiką lub procesów, których dynamika zmienia się skokowo z pasa na pas (np. systemy sterujące produkcją wytwarzania butelek plastikowych).
In the paper identification of the linear repetitive processes using the subspace methods is considered. Generally speaking, constructions of the deterministic realization theory are translated by the subspace methods into procedures (Fig. 1). The procedures which work on measured data are used for model building [5, 6]. Subspace algorithms consist of two steps. In the first step, the order and the extended observability matrix are recovered directly from the input-output data [2]. In the second step, the unknown system matrices are determined either via determining the state sequences and combining them with the input-output data or determining the matrices A and C directly from the extended observability matrix and using them to determine the remaining system matrices [3, 4]. Contrary to the LRP control theory, the identification of LRPs has attracted very limited attention. LRP are a useful tool for modelling and control of some real dynamic processes and operations [1]. The aim of this paper is to propose a new approach to the identification of the LRPs based on subspace algorithms. The order of a LRP and the unknown process matrices are determined based on the input and output sequences of the actual pass and the output sequence of the previous pass. The proposed approach can be very useful not only for time invariant linear repetitive processes but also for processes with fast dynamic changes from pass to pass (e.g., perform-to-bottle cycle process). A simulation example is provided to illustrate the proposed approach effectiveness (Fig. 2).
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 7, 7; 438-440
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Algorithm for Linear Quadratic Gaussian Predictive Control
Autorzy:
Ordys, A. W.
Hangstrup, M. E.
Grimble, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/911167.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przestrzeń fazowa
sterowanie wielowymiarowe
sterowanie predykcyjne
state-space design
multivariable control
linear quadratic Gaussian predictive control
generalized predictive control
Opis:
In this paper, the optimal control law is derived for a multi-variable state-space Linear Quadratic Gaussian Predictive Controller (LQGPC). A dynamic performance index is utilized resulting in an optimal steady-state controller. Knowledge of future reference values is incorporated into the controller design and the solution is derived using the method of Lagrange multipliers. It is shown how the well-known GPC controller can be obtained as a special case of the LQGPC controller design. The important advantage of using the LQGPC framework for designing predictive controllers is that, based on stabilizing properties of LQG control, it enables a systematic approach to selection of the design parameters to yield a stable closed-loop system. The system model considered in this paper can be further extended toalso include direct feed-through and knowledge about future external inputs.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 2; 227-244
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ liczby „najbliższych sąsiadów” na dokładność prognoz ekonomicznych szeregów czasowych
Effect of the number of “nearest neighbors” on the accuracy of economic time series forecasts
Autorzy:
Miśkiewicz-Nawrocka, Monika
Powiązania:
https://bibliotekanauki.pl/articles/591526.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Metoda najbliższych sąsiadów
Prognozowanie szeregów czasowych
Rekonstrukcja przestrzeni stanów
State space reconstruction
The nearest neighbors method
Time series forecasting
Opis:
Metoda najbliższych sąsiadów jest jedną z metod prognozowania szeregów czasowych. W metodzie tej, prognozę (N+1)-go elementu ˆN+1 x szacuje się jako średnią ważoną obserwacji xi+1, gdzie wektory d i x są k najbliższymi sąsiadami wektora d N x w zrekonstruowanej d-wymiarowej przestrzeni stanów. Istotnym problemem podczas stosowania tej metody jest wyznaczenie prawidłowej liczby najbliższych sąsiadów, która powinna być brana pod uwagę przy wyznaczaniu prognoz. Głównym celem artykułu jest zbadanie wpływu liczby najbliższych sąsiadów na dokładność prognoz ekonomicznych szeregów czasowych. Badania zostały przeprowadzone w oparciu o wybrane finansowe szeregi czasowe.
One of time series forecasting method is the nearest neighbors method. In this method, the forecast for (N+1)-th element ˆN +1 x is estimated as a weighted average of observations i+1 x , where the vectors d i x are k nearest neighbors of vector d N x in the reconstructed d-dimensional state space. An important problem when using nearest neighbors method is to determine the correct number of nearest neighbors, that should be taken into account in the determination of forecasts. The aim of the article will be to research the effect of the number of nearest neighbors on the accuracy of economic time series forecasts. The test will be conducted on the basis of selected financial time series.
Źródło:
Studia Ekonomiczne; 2016, 295; 60-69
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
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