Temat: luenberger observer

Skocz do pozycji: 1.

Tytuł:: Multi-layer observer as new structure for state estimation in linear systems
Autorzy:: Bernat, J.
Kołota, J.
Superczyńska, P.
Stępień, S.
Tematy:: Luenberger observer
Multi Observer
electric DC motor; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/140374.pdf Link otwiera się w nowym oknie
Opis:: A new structure to design observers for linear systems is presented in this work. The key step is the construction of two layers where the first consists of multiple observers and the second connects them providing the weighted estimation state. The main difficulty is to find a new feedback which is responsible for control weights. To define observation law, we rely on multi observers from the first layer. The proposed structure significantly improves the transient characteristics of the observation process, which is shown in illustrative examples.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Non-proportional full-order Luenberger observers of induction motors
Autorzy:: Białoń, T.
Lewicki, A.
Pasko, M.
Niestrój, R.
Tematy:: Luenberger observer
induction motor
pole placement; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/141473.pdf Link otwiera się w nowym oknie
Opis:: The paper recapitulates recently conducted investigations of non-proportional Luenberger observers, applied to reconstruction of state variables of induction motors. Three structures of non-proportional observers are analyzed, a proportional-integral observer, modified integral observer and observer with integrators. Criteria for gain selection of the observer are described, classical ones based on poles, as well as additional, increasing observer’s robustness. Fulfilment of the presented criteria can be ensured with the three proposed methods for gain selection, two analytical, based on dyadic transformation and one based on optimization.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Parameter selection of an adaptive PI state observer for an induction motor
Autorzy:: Białoń, T.
Lewicki, A.
Pasko, M.
Niestrój, R.
Tematy:: luenberger observer
induction motor
multiscalar control system; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201948.pdf Link otwiera się w nowym oknie
Opis:: The paper discusses problems connected with the parameters selection of the proportional-integral observer, designed for reconstruction of magnetic fluxes and angular speed of an induction motor. The selection is performed in several stages that are focused on different criteria. The first stage consists in selecting observer’s gains and provides desired dynamical properties, taking into consideration immunity to disturbances and parameter variations of observed system. The second stage prevents an observer from DC-offset cumulation and instability. The last stage consists in setting the parameters of a speed adaptation mechanism. The impact of different settings on the properties of an observer is illustrated with experimental results, obtained in the multiscalar control system of an induction motor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: PI observer stability and application in an induction motor control system
Autorzy:: Białoń, T.
Lewicki, A.
Pasko, M.
Niestrój, R.
Tematy:: luenberger observer
induction motor
multiscalar control system; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200301.pdf Link otwiera się w nowym oknie
Opis:: The paper discusses the problem of stability of a proportional-integral Luenberger observer, designated for the state variables reconstruction of a linear, time-invariant dynamical system. It is proven, that there exists such a class of observed systems, for which the observer is always unstable, independently of its gains. Stability can be provided in every possible case after application of proposed modifications to the structure of the observer. It is proven, that stability of the modified observer depends only on its gains. It is shown, that an induction motor is the exemplary observed system, for which application of the unmodified observer is impossible due to its lack of stability, while the modified observer provides proper operation of the control system. Finally, some experimental results are presented, obtained in the multiscalar control system of the induction motor, equipped with the modified proportional-integral observer.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Comparison of four state observer design algorithms for MIMO system
Autorzy:: Vinodh, K. E.
Jovitha, J
Ayyappan, S.
Tematy:: luenberger observer
Kalman observer
unknown input observer
sliding mode observer; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/229209.pdf Link otwiera się w nowym oknie
Opis:: A state observer is a system that models a real system in order to provide an estimate of the internal state of the system. The design techniques and comparison of four different types of state observers are presented in this paper. The considered observers include Luenberger observer, Kalman observer, unknown input observer and sliding mode observer. The application of these observers to a Multiple Input Multiple Output (MIMO) DC servo motor model and the performance of observers is assessed. In order to evaluate the effectiveness of these schemes, the simulated results on the position of DC servo motor in terms of residuals including white noise disturbance and additive faults are compared.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Real-time simulation and experimental implementation of luenberger observer-based speed sensor fault detection of bldc motors
Autorzy:: Al-Mutayeb, Yousef
Almobaied, Moayed
Ouda, Mohamed
Tematy:: brushless DC motor
Hall sensors
faults detection
Luenberger observer; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/58907273.pdf Link otwiera się w nowym oknie
Opis:: Modern control systems’ dependability, safety and efficiency have all been improved by studying fault-tolerant control systems (FTCS). FTCS techniques can typically be active or passive controls. The fault detection and diagnosis (FDD) method is used in this study’s active control branch to identify probable faults that could develop in the speed Hall sensors of brushless DC motors (BLDC). FDD methodologies can be categorised into two types, depending on the available data and the process involved: model-based methods and data-based methods. The proposed approach in this study explores the implementation of the Luenberger observer methodology as part of the model-based approach. The chosen methodology was practically implemented and subjected to experimental evaluation. The proposed observer relies on the residual signal, which displays the difference between the plant’s observed and estimated speed signals and serves as a failure alert for the entire system. Given the increasing demand for BLDC motors in various industrial control applications, including medical fields, automation and robotics, this particular motor was selected as a benchmark to thoroughly evaluate and validate the proposed method. The primary contribution of this paper lies in the real-time application of model-based sensor fault detection methods to BLDC motors. The efficiency of the suggested method is showcased through extensive MATLAB simulations, where the obtained results confirm the successful detection of faults with a high level of responsiveness. As a result, the project was successfully implemented in real-time, and the experimental results exhibited a close correlation with the simulated outcomes. This consistency between simulation and practical implementation validates the accuracy and reliability of the proposed methodology for detecting faults in the BLDC motor speed sensor. The results underscore the heightened reliability and safety attained by promptly and accurately detecting sensor faults during the operation of the motor.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: Sensorless backstepping control using a Luenberger observer for double-star induction motor
Autorzy:: Chaabane, Hadji
Eddine, Khodja Djalal
Salim, Chakroune
Tematy:: backstepping control
double star induction machine (DSIM) drive
Luenberger observer; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/141539.pdf Link otwiera się w nowym oknie
Opis:: In this paper, we propose sensorless backstepping control of a double-star induction machine (DSIM). First, the backstepping approach is designed to steer the flux and speed variables to their references and to compensate uncertainties. Lyapunov”s theory is used and it demonstrates that the dynamic tracking of trajectories tracking is asymptotically stable. Second, unfortunately, this law control called sophisticated is a major problem which leads to the necessity of using a mechanical sensor (speed, load torque). This imposes an additional cost and increases the complexity of the montage. In practice, this variable is unknown and its measurement is expensive. To restrain this problem we estimate speed and load torque by using a Luenberger observer (LO). Simulation results are provided to illustrate the performance of the proposed approach in high and low variable speeds and load torque disturbance.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: On observer compensator design for non-autonomous control semi-linear evolution equations
Autorzy:: Badri, Fatma
Damak, Hanen
Hammami, Mohamed Ali
Tematy:: compensator design
non-autonomous control semilinear evolution equations
practical stabilization
practical Luenberger observer; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59111204.pdf Link otwiera się w nowym oknie
Opis:: This paper investigates the Luenberger observer design problem for non-autonomous control semilinear evolution equations with disturbances in Banach spaces. Then, the practical stabilization problem of the system is solved, yielding a compensator based on the Luenberger observer by using integral inequalities of the Gronwall type. Sufficient conditions of the controller and observer problem are satisfied, we show that the proposed controller with estimated state feedback from the proposed practical Luenberger observer will achieve global practical stabilization. We develop novel ideas and techniques, which present the further development of mathematical control theory. Furthermore, an example is given to show the applicability of our theoretical results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Fault diagnosis-based observers using Kalman filters and Luenberger estimators: Application to the pitch system fault actuators
Autorzy:: Zemali, Zakaria
Cherroun, Lakhmissi
Hadroug, Nadji
Nadour, Mohamed
Hafaifa, Ahmed
Tematy:: fault detection
estimation
pitch system
Kalman filter
Luenberger observer
wykrywanie uszkodzeń
estymacja
filtr Kalmana
obserwator Luenbergera; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Powiązania:: https://bibliotekanauki.pl/articles/2174470.pdf Link otwiera się w nowym oknie
Opis:: This paper aims to present a robust fault diagnosis structure-based observers for actuator faults in the pitch part system of the wind turbine benchmark. In this work, two linear estimators have been proposed and investigated: the Kalman filter and the Luenberger estimator for observing the output states of the pitch system in order to generate the appropriate residual between the measured positions of blades and the estimated values. An inference step as a decision block is employed to decide the existence of faults in the process, and to classify the detected faults using a predetermined threshold defined by upper and lower limits. All actuator faults in the pitch system of the horizontal wind turbine benchmark are studied and investigated. The obtained simulation results show the ability of the proposed diagnosis system to determine effectively the occurred faults in the pitch system. Estimation of the output variables is effectively realized in both situations: without and with the occurrence of faults in the studied process. A comparison between the two used observers is demonstrated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: State estimators and observers for continuous and discrete linear systems. Part 1. Differential asymptotic state estimators
Autorzy:: Byrski, J.
Byrski, W.
Tematy:: linear estimator
Kalman filter
Luenberger observer
exact state observer
linear system
estymator liniowy
filtr Kalmana
obserwator Luenbergera
dokładny obserwator stanu
system liniowy; Pokaż więcej
Wydawca:: Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Powiązania:: https://bibliotekanauki.pl/articles/93134.pdf Link otwiera się w nowym oknie
Opis:: In the paper an overview of state estimators and state observers used in linear systems, will be presented. The state estimators and observers can be used in many applications like the state reconstruction for the control purposes or for the diagnosis and fault detection in technical processes or for the virtual measurements of inaccessible variables of the system as well as for the best filtration of the differential equation solution. As the standard most commonly the Kalman filter and Luenberger type observers are used. Although the Kalman filter guarantees optimal filtering quality of the state, reconstructed from the noisy measurements, both Kalman filter and the Luenberger observer guarantee only asymptotic quality of the real state changes and tracking, basing on the current measurements of the system output and input signals. Unfortunately, the value of the estimation error at any moment of time cannot be calculated. The discussion on differences between continuous and two types of discrete Kalman Filter will be presented. This paper is planned to be the introduction to presentation of another type of the state observers which have the structure given by the integral operators. Based on measurements of the system output and input signals on some predefined finite time interval, they can reconstruct, after this interval, the observed state exactly.
Dostawca treści:: Biblioteka Nauki

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