Temat: model linearization - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Weakly nonlinear regression model with constraints I: nonlinear hypothesis
Autorzy:: Kubácek, Lubomír
Tesaríková, Eva
Powiązania:: https://bibliotekanauki.pl/articles/729706.pdf
Data publikacji:: 2005
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: regression model with constraints
nonlinear hypothesis
linearization
Opis:: The problem considered is under which conditions in weakly nonlinear regression model with constraints I a weakly nonlinear hypothesis can be tested by linear methods. The aim of the paper is to find a region around the approximate value of the regression parameter with the following property. If we are certain that the actual value of the regression parameter is in this region, then the linear method of testing can be used without any significant deterioration of the inference.
Źródło:: Discussiones Mathematicae Probability and Statistics; 2005, 25, 1; 115-133
1509-9423
Pojawia się w:: Discussiones Mathematicae Probability and Statistics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The linearization of mooring load distribution problem
Autorzy:: Artyszuk, J.
Powiązania:: https://bibliotekanauki.pl/articles/135702.pdf
Data publikacji:: 2016
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: ship manoeuvring
mooring
berthing
hydrodynamics
loads
linear model
linearization
Opis:: This paper presents a novel step forward in finding the loads of particular mooring ropes that balance the steady environmental excitations for a ship staying at berth. The industrial static equilibrium method for a rough assessment of ship mooring safety is considered to be well-established. The static loads are directly related to the rope’s MBLs (minimum breaking loads) while applying a certain safety margin (usually 50%). The problem is reduced to a set of linear equations that may be solved analytically. The generality in terms of arbitrary horizontal and vertical angles of mooring ropes is preserved. All derivations are provided to enhance trust in the very simple yet absolutely accurate and fast linear solution. The accuracy is studied both analytically, throughout all the development stages, and finally by comparison to the exact numerical solution of the original nonlinear equilibrium equations for an exemplary mooring pattern. A discussion of selected effects in load distribution is also given. Using the approach presented, for instance, we can efficiently test mooring safety when any mooring rope of the set is accidentally broken.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 46 (118); 9-16
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Test bench and simulation research on hydrodynamic torque converter for different input signals
Autorzy:: Wozniak, M.
Siczek, K.
Pawelski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/247933.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: torque converter
torque
Matlab/Simulink
linearization
nonlinear model
ARX
OE
Opis:: This paper presents the experimental research and simulating results of a ZM130 hydrodynamic torque converter under steady and unsteady working conditions with an external step signal and sinus on turbine’s shaft on a modified test bench. The mathematical model of torque converter was described by the one-dimensional flow theory with variable loss coefficients. The character of received equations from test bend showed by linearized transmittance functions with variable coefficients. For test bend object identification researches will be used an Identification Toolbox from a mathematical code in Matlab, which enables to create transfer functions as a linear model from measurements data as they got the highest correctness level with input signal (as they get the best correction level with input signal on the pump´s shaft). This mathematical model for dynamic loads will be verified by experimental tests. The aim of the carried out studies was determination the effect of sampling time decreasing on the quality of measured parameters. Results of present investigations were compared with those obtained earlier, but for the same input signals .It is possible to affirm that proposed theoretical model imitates the change of dynamic parameters, and the same the property of the torque converter. Researches led on the test bend with extortion input torque sinus signal on the turbine’s shaft confirmed correctness of this model.
Źródło:: Journal of KONES; 2016, 23, 4; 561-568
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Investigation of the dynamics of singular protected systems
Autorzy:: Naumeyko, I.
Alja'afreh, M.
Powiązania:: https://bibliotekanauki.pl/articles/411040.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:: "Man-Machine-Environment" model
non-linear system
singular equations
asymptotic
linearization
Opis:: The analysis of asymptotic representations of the systems protected from harmful influences is carried out. Various types of general models of the "manmachineenvironment" with protection are considered. Each of them adequately describes some of the practically important qualities of the object, and they all together describe the object in terms of its safe operation. The dynamic properties of complex ergonomic systems, presented in the form of systems of differential equations with a small parameter at the derivative are investigated The methods of reducing the impact on the person of harmful factors are theoretically substantiated. The dynamic protection response speed is considered to be significantly greater than the harmful factor production rate. Numerical solution of the general problem and the analytical solution for autonomous case is obtained for harmful effects. By using asymptotic the system of equations has been solved in closed form not only for autonomous case, but also for parameters smoothly changing in time. The estimates of the cost of protection was obtained for the various cost-functionals and for different functions in the right-hand side of the equation describing the dynamics of protection. To assess the accuracy of model calculations and for graphic representation of the results mathematical package MAXIMA is used.
Źródło:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 4; 37-42
2084-5715
Pojawia się w:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A mathematical model for controlling a quadrotor UAV
Model matematyczny do sterowania czterowirnikowym BSP
Autorzy:: Kowalik, Rafał
Łusiak, Tomasz
Novak, Andrej
Powiązania:: https://bibliotekanauki.pl/articles/36444941.pdf
Data publikacji:: 2021
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: UAV control system
dynamics model
quadrotor
linearization
system kontroli BSP
model dynamiki
czterowimikowy BSP
linearyzacja
Opis:: Given the recent surge in interest in UAVs and their potential applications, a great deal of work has lately been done in the field of UAV control. However, UAVs belong to a class of nonlinear systems that are inherently difficult to control. In this study we devised a mathematical model for a PID (proportional integral derivative) control system, designed to control a quadrotor UAV so that it follows a predefined trajectory. After first describing quadrotor flight dynamics, we present the control model adopted in our system (developed in MATLAB Simulink). We then present simulated results for the use of the control system to move a quadrotor UAV to desired locations and along desired trajectories. Positive results of these simulation support the conclusion that a quadrotor UAV spatial orientation control system based on this model will successfully fulfil its task also in real conditions.
Wobec rosnącego zainteresowania bezzałogowymi statkami powietrznymi (BSP) i ich potencjalnymi zastosowaniami, w ostatnim czasie wykonano wiele prac w dziedzinie ich lepszego sterowania. BSP jednak należą do klasy nielinearnych systemów, które są z natury trudne do sterowania. W niniejszej pracy opracowano model matematyczny dla systemu sterowania opartego na metodzie PID (proportional integral derivative), zaprojektowanego do sterowania czterowirnikowym BSP tak, aby podążał on po wcześniej zdefiniowanej trajektorii. Opisano dynamiki lotu czterowirnikowym BSP i zaprezentowano model kontroli zastosowany w naszym systemie (opracowany w programie MATLAB Simulink). Przedstawione są wyniki symulacji użycia systemu do sterowania czterowirnikowym BSP w celu jego przemieszczenia się do pożądanej lokalizacji oraz wzdłuż pożądanej trajektorii. Wyniki tych symulacji potwierdzają wniosek, że oparty na tym modelu system sterowania dla czterowirnikowego BSP może z powodzeniem spełnić swoje zadanie również w warunkach rzeczywistych.
Źródło:: Transactions on Aerospace Research; 2021, 3 (264); 58-70
0509-6669
2545-2835
Pojawia się w:: Transactions on Aerospace Research
Dostawca treści:: Biblioteka Nauki

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