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Tytuł:
Effects of sliding surface on the performances of adaptive sliding mode slip ratio controller for a HEV
Autorzy:
Dash, B. K.
Subudhi, B.
Powiązania:
https://bibliotekanauki.pl/articles/229381.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sliding mode control
slip ratio control
hybrid electric vehicle
sliding surface
ABS
Opis:
Slip ratio control of a ground vehicle is an important concern for the development of antilock braking system (ABS) to avoid skidding when there is a transition of road surfaces. In the past, the slip ratio models of such vehicles were derived to implement ABS. It is found that the dynamics of the hybrid electric vehicle (HEV) is nonlinear, time varying and uncertain as the tire-road dynamics is a nonlinear function of road adhesion coefficient and wheel slip. Sliding mode control (SMC) is a robust control paradigm which has been extensively used successfully in the development of ABS of a HEV. But the SMC performance is influenced by the choice of sliding surface. This is due to the discontinuous switching of control force arising in the vicinity of the sliding surface that produces chattering. This paper presents a detailed study on the effects of different sliding surfaces on the performances of sliding mode based adaptive slip ratio control applied to a HEV.
Źródło:
Archives of Control Sciences; 2013, 23, 2; 187-203
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of a sliding gate controlled by a PLC driver
Autorzy:
Majcher, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/376511.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
PLC
sliding gate
visualisation
Opis:
Due to low costs, PLC controllers are used not only in technological processes but also in everyday life. The article presents the possibility of using a PLC controller to control the operation of a sliding gate. For this purpose, a design was created and a sliding gate model made controlled with a Siemens S7-1200 PLC controller. This model is used to develop various gate control algorithms, especially for appropriate gate protection against crushing or uncontrolled closing. In addition, this model is connected via the Internet to a stand equipped with the SCADA application. The iFix 5.8 PL application was used to visualise the operation of the door, which, by means of a communication driver, allows the elevator operation to be controlled remotely. In addition, elements are shown in a graphic way, whereby it is possible to assess the position of the gate.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 99; 191-199
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode control of periodic review perishable inventories with multiple suppliers and transportation losses
Autorzy:
Bartoszewicz, A.
Maciejewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200764.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
discrete time sliding mode control
sliding surface design
inventory control
Opis:
The purpose of this paper is to develop robust and computationally efficient supply chain management strategy ensuring fast reaction to the demand variations for periodic review perishable inventory systems. For that purpose, we apply a sliding mode approach and we propose a new discrete time warehouse management strategy. The strategy employs the sliding hyperplane appropriately designed to ensure a dead-beat performance of the closed loop system. Our strategy not only explicitly takes into account decay of goods stored in the warehouse (perishing inventories) but it also accounts for transportation losses which take place on the way from suppliers to the warehouse. The proposed strategy ensures full customers’ demand satisfaction, minimizes the on-hand inventory volume and prevents from exceeding the warehouse capacity. This reflects the need of simultaneous minimization of the lost sales costs and inventory holding costs. Furthermore, the strategy ensures that the ordered quantities of goods are always non-negative and upper bounded. These favourable properties of the proposed strategy are formally stated as a lemma and three theorems and proved in the paper.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 885-892
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filtered integral sliding mode control in a two-mass drive system
Autorzy:
Dróżdż, P.
Szabat, K.
Powiązania:
https://bibliotekanauki.pl/articles/1193310.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
filtered integral sliding mode control
integral sliding mode control
two-mass system
chattering alleviation
Opis:
The paper presents issues related to the application of filtered integral sliding mode control to a two-mass drive system. A classical control structure has been presented and its design procedure is shown in detail. The properties of the classical structure, in which the chattering phenomenon seems to be a big drawback, have been summarized. In order to eliminate this phenomenon, an output low-pass filter has been proposed and the performance of this system has been tested. In order to improve its characteristics, an adaptive low-pass filter has been proposed. The bandwidth of the filter was changed on-line by the fuzzy system according to the current state of the plant. During the steady-states, the bandwidth is low to eliminate chattering effect, and during transients higher in order to ensure the fast dynamics of the plant.
Źródło:
Power Electronics and Drives; 2017, 2, 37/1; 121-134
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode control for longitudinal aircraft dynamics
Autorzy:
Iskrenovic-Momcilovic, O.
Powiązania:
https://bibliotekanauki.pl/articles/385149.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
aircraft dynamics
control
elevator
longitudinal
sliding mode
Opis:
The control of the longitudinal aircraft dynamics is challenging because the mathematical model of aircraft is highly nonlinear. This paper considers a sliding mode control design based on linearization of the aircraft, with the pitch angle and elevator deflection as the trim variables. The design further exploits the decomposition of the aircraft dynamics into its short-period and phugoid approximations. The discrete-time variable structure system synthesis is performed on the base of the elevator transfer function short-period approximation. This control system contains a sliding mode controller, an observer, based on nominal aircraft model without finite zero and two additional control channels for the aircraft and for the aircraft model. The realised system is stable and robust for parameter and external disturbances.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2018, 12, 3; 55-60
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-Sliding Mode Control of Discrete-Time Systems
Autorzy:
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/908266.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sterowanie
system dyskretny
sliding-mode control
discrete-time systems
Opis:
A reaching law approach to the design of discrete-time quasi-sliding mode control systems is considered. First the required position of the system representative point with reference to the sliding plane is specified, and then novel control strategies, which drive the system in such a way that the position actually changes according to the specification, are proposed. The strategies are linear and consequently the undesirable chattering and high-frequency switching between different values of the control signal are avoided. Furthermore, the state of the controlled system is driven to the narrowest possible band around the sliding plane. The strategies, when compared with previously published results, are simpler and they guarantee favourable performance of the controlled systems while using essentially reduced control effort.
Źródło:
International Journal of Applied Mathematics and Computer Science; 1999, 9, 4; 801-810
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive fuzzy-sliding mode controller for trajectory tracking control of quad-rotor
Autorzy:
Simoud, Lahcen
Kadri, Boufeldja
Bousserhane, Ismail Khalil
Powiązania:
https://bibliotekanauki.pl/articles/384825.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
quadrotor UAV
sliding mode control
adaptive PD-Slidng mode controller
fuzzy PD-sliding mode
Opis:
This paper deals with the design of an adaptive-fuzzy-PD-Sliding mode controller to achieve stabilization of a quadrotor aircraft in the presence of wind disturbance. Firstly, the dynamic system modeling is carried out using Euler-Lagrange formalism. Then, an adaptive PD-sliding mode control system with an integral-operation switching surface is investigated for quadrotor desired trajectory tracking. Finally, an adaptive fuzzy-PD-sliding mode controller is proposed to achieve control objectives and system stabilization where the fuzzy logic system used to dynamically control parameters settings of the PD-sliding mode equivalent control law. Effectiveness and robustness of the proposed control scheme is verified through simulation results taking into account external disturbances. The simulation results of a quadrotor aircraft control with the proposed controller demonstrate the high performance during flight such as null tracking error and robustness in the presence of external disturbances.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 2; 15-24
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the sliding of curves
Autorzy:
Tatarkiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/726171.pdf
Data publikacji:
1967
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Colloquium Mathematicum; 1967, 18, 1; 103-106
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surgical trap of a routine procedure. Scrotal hernia with concomitant sliding of the urinary bladder – case report
Autorzy:
Cybułka, Bartosz
Podgórny, Marek
Rapeła, Jacek
Wach, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1394320.pdf
Data publikacji:
2015
Wydawca:
Index Copernicus International
Tematy:
scrotal hernia
sliding hernia
sliding of the urinary bladder
scrotal cystocele
Opis:
The content of the hernial sac may comprise peritoneal cavity elements, such as small and large bowel loops, visceral adipose tissue, the greater omentum, appendix (amyand hernia), and Meckel's diverticulum. The sliding of part of the urinary bladder wall to the inguinal canal is rare, being observed in 1%-4% (0.5%-3%) of inguinal hernia cases. Complete migration of the urinary bladder to the scrotum is considered a rare anomaly. As of today, 100 such cases have been described.
Źródło:
Polish Journal of Surgery; 2015, 87, 11; 587-591
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis of sliding-mode feedback control
Autorzy:
Clarke, F. H.
Vinter, R. B.
Powiązania:
https://bibliotekanauki.pl/articles/970887.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sliding-mode control
discontinuous control
Lyapunov functions
stabilization
robustness
Opis:
This paper provides new analytic tools leading to the first rigorous stability and robustness analysis of sliding-mode feedback controllers. Unrestrictive conditions are given, under which these controllers are stabilizing in the presence of large disturbances, conditions invoke the existence of two Lyapunov-type functions, the first associated with passage to the sliding set in finite time, and the second with convergence to the desired state. In this approach, account is taken, from the outset, of implementational constraints. We provide a framework for establishing stability and robustness of the closed-loop system, for a variety of implementation schemes. We illustrate our results by means of two examples of the type frequently encountered in the sliding-mode literature.
Źródło:
Control and Cybernetics; 2009, 38, 4A; 1169-1192
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Continuous and discrete sliding mode control of an active car suspension system
Autorzy:
Łuczko, J.
Ferdek, U.
Powiązania:
https://bibliotekanauki.pl/articles/280694.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
sliding mode control
active damping
car suspension
Opis:
In this paper, sliding mode control (SMC) algorithms are tested for their use in an active car suspension system. Using the quarter model of the car as an example, the comparison of the efficiency of the algorithms is made. A continuous and two discrete versions of the sliding mode control are taken into consideration. The study is limited to finding the relation between the control parameters and the comfort factor. This is done by analyzing the response of the model to the harmonic and impulse excitation.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 3-11
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive sliding mode control for ship autopilot with speed keeping
Autorzy:
Liu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/259349.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
surface vessel
speed loss
adaptive control
course keeping
sliding mode control
Opis:
The paper addresses an important issue in surface vessel motion control practice that the ship dynamics and sailing performance can be affected by speed loss. The vessel speed is significantly decreased by the added resistance generated by waves. An adaptive sliding mode course keeping control design is proposed which takes into account uncertain ship dynamics caused by forward speed variations, while avoiding performance compromises under changing operating and environmental conditions. The sliding mode control provides robust performance for time-varying wave disturbances and time-varying changes in ship parameters and actuator dynamics. After combining the unknown but bounded system uncertainties, the design of the adaptation law is obtained which is based on the Lyapunov’s direct method. Simulations on a ship with two rudders illustrate the effectiveness of the proposed solution.
Źródło:
Polish Maritime Research; 2018, 4; 21-29
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological properties of sliding pairs with surface layer containing boron under mixed friction conditions
Autorzy:
Lubas, J.
Powiązania:
https://bibliotekanauki.pl/articles/242626.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
surface treatment
wear
sliding friction
boron
bearing alloy
Opis:
The aim of the present work is to determine the influence of surface layers containing boron on the friction parameters in sliding pairs under mixed friction conditions. The tribological evaluation included three production methods of surface layers with boron; pack boronizing, laser boronizing, and TiB2 coating deposited on 46Cr2 steel. Modified surface layers of ring specimens with 46Cr2 steel were matched under test conditions with a counterpart made from AlSn20 bearing alloy. Tested sliding pairs were lubricated with 5W/40 Lotos synthetic engine oil. The applied modification technologies of the surface layer of steel allowed for obtaining construction materials with predetermined tribological characteristics required for the elements of sliding pairs working undermixed friction conditions. The results showed differences in the wear of bearing alloy, as the effect of the interaction between the cooperating surface layers and of the physiochemical changes of their surfaces, induced by external forces. The TiB2 coating generated the highest friction resistance and bearing alloy wear. The pack borided surface layer reduces the friction coefficient, the moment during the start-up of the frictional pair and the wear of the bearing material. The analysis of the surface layer indicated that the content of aluminum on pack borided ring specimens reached 21%, and on the TiB2 coating, it exceeded 8%.
Źródło:
Journal of KONES; 2013, 20, 1; 185-192
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dry Sliding Wear Behavior of Boron-Doped AISI 1020 Steels
Autorzy:
Aktas, B.
Balak, V.
Carboga, C.
Powiązania:
https://bibliotekanauki.pl/articles/1031623.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
dry sliding wear
AISI 1020 steel
boron
friction
Opis:
In the present study, the wear properties of AISI 1020 steels produced by a casting process with different boron contents were investigated, using a pin-on-disc tribometer under dry sliding conditions. The friction coefficients of undoped AISI 1020 steel, 0.002 and 0.01 wt% boron-doped samples were 0.33, 0.27, and 0.32, respectively. The addition of boron into AISI 1020 steel led to a decrease in the friction coefficient, due to the lubricating effect of boron; X-ray diffraction showed that both Fe₂B and FeB phases are present in the boron-doped samples, both of which cause this lubrication. The wear test results also showed that the wear rate of the 0.002 wt% boron-doped AISI 1020 sample decreased compared to the undoped AISI steel, and then increased in the 0.01 wt% boron sample. Therefore, the wear resistance of AISI 1020 steel is increased with the addition of small amounts of boron. Scanning electron microscopy results indicated that the characteristic wear mechanism for the boron-doped sample surfaces was plastic deformation and mild abrasive wear; for undoped AISI 1020 steel, cracking and spalling were observed instead.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 455-457
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chattering attenuation in sliding mode control systems
Autorzy:
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/206731.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
nieliniowy system sterowania
nonlinear control system
compensation
control nonlinearities
sliding mode control
variable structure systems
Opis:
In this paper sliding mode control systems are considered and a new technique to attenuate chattering is proposed. The technique employs simple, first-order dynamical devices, i.e. an integrator or a low-pass filter, to compensate in part for unknown and changing disturbance. As a result of this compensation, the magnitude of the discontinuous control term is essentially reduced. The term does not depend on the admissible disturbance or its change rate, but only on the uncertainty of the disturbance at the initial time t = t[sub o]. The technique proposed in this paper attenuates the undesirable chattering without any deterioration of the system performance.
Źródło:
Control and Cybernetics; 2000, 29, 2; 585-584
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of an Induction Motor Using Sliding Mode Linearization
Autorzy:
Etien, E.
Cauet, E.
Rambault, L.
Champenois, G.
Powiązania:
https://bibliotekanauki.pl/articles/908504.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
automatyka
induction motor
sliding mode control
linearization
Opis:
Nonlinear control of the squirrel induction motor is designed using sliding mode theory. The developed approach leads to the design of a sliding mode controller in order to linearize the behaviour of an induction motor. The second problem described in the paper is decoupling between two physical outputs: the rotor speed and the rotor flux modulus. The sliding mode tools allow us to separate the control from these two outputs. To take account of parametric variations, a model-based approach is used to improve the robustness of the control law despite these perturbations. Experimental results obtained with a laboratory setup illustrate the good performance of this technique.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 4; 523-531
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strategie sterowania ślizgowego z ruchomą hiperpowierzchnią przełączeń - krótki przegląd
Sliding Mode Control Strategies with a Time-Varying Switching Hypersurface - a Brief Survey
Autorzy:
Latosiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/275701.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
teoria sterowania
sterowanie ślizgowe
ruchome hiperpowierzchnie przełączeń
control theory
sliding mode control
time-varying sliding hypersurface
Opis:
Strategie sterowania ślizgowego są cenione za swoją całkowitą niewrażliwość na klasę zakłóceń i niepewności modelu. Uzyskanie tej właściwości jest możliwe przez sprowadzenie punktu opisującego dynamikę układu na pewną hiperpowierzchnię przełączeń zdefiniowaną w przestrzeni stanów. W początkowym etapie sterowania, w którym punkt opisujący zbliża się do tej hiperpowierzchni, układ pozostaje wrażliwy na zakłócenia, co utrudnia projektowanie skutecznych strategii sterowania ślizgowego. Aby zapewnić odporność układu na zakłócenia i niepewności modelu na wszystkich etapach procesu sterowania liczni autorzy zaproponowali zastosowanie ruchomych hiperpowierzchni przełączeń. Celem niniejszego artykułu przeglądowego jest przedstawienie najważniejszych osiągnięć z zakresu sterowania ślizgowego z wykorzystaniem takich hiperpowierzchni. Omówione są pionierskie prace proponujące zastosowanie ruchomych hiperpowierzchni przełączeń oraz przedstawione są metody ich projektowania. Następnie podkreślone są najważniejsze osiągnięcia z zakresu sterowania ślizgowego wykorzystującego ruchome hiperpowierzchnie przełączań zarówno dla układów ciągłych jak i dyskretnych.
Sliding mode control strategies are valued for their total insensitivity to the class of disturbances and uncertainty of the model. Obtaining this property is possible by bringing a point describing the dynamics of the system to a certain switching hypersurface defined in the state space. At the initial stage of control, where the description point approaches this hypersurface, the system remains sensitive to interferences, which hinders the design of effective sliding mode control strategies. To ensure the system’s resistance to interference and model uncertainty at all stages of the control process, many authors proposed the use of mobile switching hypersurfaces. The purpose of this review article is to present the most important achievements in the area of sliding mode control using such hypersurfaces. Discussed are pioneering works proposing the use of mobile switching hypersurfaces and methods of their design are presented. Next, the most important achievements in the area of sliding mode control using movable switching hypersurfaces for both continuous and discrete systems are highlighted.
Źródło:
Pomiary Automatyka Robotyka; 2020, 24, 1; 41-47
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental evaluation of DLC/steel sliding contacts’ operational envelope
Doświadczalna ocena dopuszczalnych warunków eksploatacji dla ślizgowego skojarzenia DLC/stal
Autorzy:
Łubiński, J.
Wasilczuk, M
Powiązania:
https://bibliotekanauki.pl/articles/190091.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sliding friction testing
tribometer
distributed contact
sliding friction
resistance to wear
badania tarcia ślizgowego
tribometr
styk konforemny
tarcie ślizgowe
odporność na zużycie
Opis:
In an industrial project concerning sliding bearings, a sliding pair was selected of high alloy steel vs. industrial grade DLC coated high alloy steel as a basis for an innovative design of high performance sliding bearings lubricated with a synthetic oil for use in geared transmission units. The development process required credible data on the ultimate resistance of the sliding pair to very high contact stress. An experimental evaluation was undertaken in ring-on-ring contact with an incremental semi-steady state input parameters increase. Due to restrictions in time, economy, and manufacturing, the number of specimen sets available was limited. A flexible approach to specimen use and load/velocity/time combinations was employed to deliver required test results within the available resource limitations and at constantly updated project detailed goals.
Przedstawiono przebieg i wyniki badań tarcia ślizgowego skojarzenia próbek ze stali wysokostopowej z powłoką DLC do zastosowań przemysłowych naniesioną na jedną ze stron skojarzenia. Badania stanowiły część prac związanych z rozwojem łożysk ślizgowych o wysokiej obciążalności jednostkowej, przeznaczonych do pracy w warunkach smarowania syntetycznym olejem przekładniowym. W toku prac rozwojowych konieczne okazało się uzyskanie danych na temat maksymalnej odporności powłoki na uszkodzenia przy bardzo dużych obciążeniach jednostkowych. Doświadczenia przeprowadzono w skojarzeniu płaskim, pierścieniowym przy semistacjonarnym wymuszeniu obciążeniem. Z uwagi na ograniczenia czasowe, finansowe i technologiczne związane z ograniczonymi możliwościami wytwarzania próbek, prace badawcze zrealizowano przy bardzo ograniczonej liczbie skojarzeń. Wykorzystano elastyczne podejście do wykorzystania próbek oraz zastosowanych w testach kombinacji obciążenie/prędkość/czas, aby zgromadzić dla partnera przemysłowego potrzebne wyniki w ramach dostępnych środków i przy ciągłych korektach szczegółowych celów podczas prowadzenia prac.
Źródło:
Tribologia; 2018, 281, 5; 41-46
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ship trajectory tracking control system design based on sliding mode control algorithm
Autorzy:
Liu, Y.
Bu, R.
Gao, X.
Powiązania:
https://bibliotekanauki.pl/articles/259621.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
LOS
ship trajectory
tracking control system
sliding mode control
Opis:
The paper reports the design and tests of the planar autopilot navigation system in the three-degree-of-freedom (3-DOF) plane (surge, sway and yaw) for a ship. The aim of the tests was to check the improved maneuverability of the ship in open waters using the improved nonlinear control algorithm, developed based on the sliding mode control theory for the ship-trajectory tracking problem of under-actuated ships with static constraints, actuator saturation, and parametric uncertainties. With the integration of the simple increment feedback control law, the dynamic control strategy was developed to fulfill the under-actuated tracking and stabilization objectives. In addition, the LOS (line of sight) guidance system was applied to control the motion path, whereas the sliding mode controller was used to emulate the rudder angle and propeller rotational speed control. Firstly, simulation tests were performed to verify the validity of the basic model and the tracking control algorithm. Subsequently, full scale maneuverability tests were done with a novel container ship, equipped with trajectory tracking control and sliding mode controller algorithm, to check the dynamic stability performance of the ship. The results of the theoretical and numerical simulation on a training ship verify the invariability and excellent robustness of the proposed controller, which: effectively eliminates system chattering, solves the problem of lateral drift of the ship, and maintains the following of the trajectory while simultaneously achieving global stability and robustness.
Źródło:
Polish Maritime Research; 2018, 3; 26-34
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-gain feedback and sliding modes in infinite dimensional systems
Autorzy:
Levaggi, L.
Powiązania:
https://bibliotekanauki.pl/articles/970418.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
system nieskończenie wymiarowy
zaburzenia osobliwe
infinite dimensional systems
high-gain feedback
singular perturbations
sliding modes
Opis:
This paper focuses on the connection between sliding motions and low frequency modes of high-gain feedback systems in an infinite dimensional framework. We study a particular class of abstract control systems in a Hilbert space setting and analyse their high-gain behaviour through singular perturbations. We show that the "slow" motion derived from the reduced model approximates the evolution of the closed loop after a fast transient. Moreover we prove a relation between this slow component of the high-gain feedback system and sliding motions, in the spirit, of the analogous result in the finite dimensional setting by Young, Kokotovic and Utkin (Young et al., 1977).
Źródło:
Control and Cybernetics; 2004, 33, 1; 33-50
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An itae optimal sliding mode controller for systems with control signal and velocity limitations
Autorzy:
Pietrala, Mateusz
Leśniewski, Piotr
Bartoszewicz, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2204689.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
sliding mode control
optimal control
state constraints
Opis:
In this paper, a sliding mode controller, which can be applied for second-order systems, is designed. Robustness to external disturbances, finite regulation time and a good system’s behaviour are required for a sliding mode controller. In order to achieve the first two of these three goals, a non-linear, time-varying switching curve is introduced. The representative point (state vector) belongs to this line from the very beginning of the control process, which results in elimination of the reaching phase. The stable sliding motion along the switching curve is provided. Natural limitations such as control signal and system’s velocity constraints will be taken into account. In order to satisfy them, the sliding line parameters will be properly selected. However, a good dynamical behaviour of the system has to be provided. In order to achieve that, the integral time absolute error (ITAE) quality index will be introduced and minimised. The simulation example will verify theoretical considerations.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 2; 230--238
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dead-Beat and reaching law based sliding mode control laws for perishable inventories with transportation losses
Autorzy:
Bartoszewicz, A.
Maciejewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/229507.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sliding mode control
perishable inventories
inventory control
Opis:
This paper describes discrete sliding mode (SM) supply management strategies for inventory systems with perishable goods and transportation losses. In the considered systems, the stock used to satisfy the unknown, bounded and time-varying demand is replenished with some delay from a distant supply source. The on-hand stock deterioration during lead-time delay, as well as commodity losses in supply process are explicitly taken into account. Two supply management strategies are proposed. The first one ensures fast reaction to the imposed demand variations, but may result in excessive control signal magnitude at the beginning of the inventory management process. Therefore, in order to conform to supplier limitations we also develop an alternative control strategy based on the concept of the reaching law. That strategy helps reduce the initial supply rate and satisfy the supplier limitations. A number of desirable properties of both proposed strategies are formulated and formally proved. These properties include full customer demand satisfaction and elimination of the risk of exceeding the warehouse capacity.
Źródło:
Archives of Control Sciences; 2012, 22, 3; 255-272
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical sliding mode control for a class of SIMO under-actuated systems
Autorzy:
Qian, D.
Yi, J.
Zhao, D.
Powiązania:
https://bibliotekanauki.pl/articles/971008.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
control approaches
control applications
sliding mode control
underactuated systems
Opis:
A hierarchical sliding mode control approach is proposed for a class of SIMO under-actuated systems. This class of under-actuated systems is made up of several subsystems. Based on this physical structure, the hierarchical structure of the sliding surfaces is designed as follows. At first, the sliding surface of every subsystem is defined. Then the sliding surface of one subsystem is defined as the first layer sliding surface. The first layer sliding surface is used to construct the second layer sliding surface with the sliding surface of another subsystem. This process continues till the sliding surfaces of the entire subsystems are included. According to the hierarchical structure, the total control law is deduced by the Lyapunov theorem. In theory, the asymptotic stability of the entire system of sliding surfaces is proven and the parameter boundaries of the subsystem sliding surfaces are given. Simulation results show the feasibility of this control method through two typical SIMO under-actuated systems.
Źródło:
Control and Cybernetics; 2008, 37, 1; 159-175
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of sliding friction of WC-Co composite on particleboard
Autorzy:
Wilkowski, Jacek
Barlak, Marek
Jałocha, Radosław
Werner, Zbigniew
Auriga, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/2200135.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
WC-Co composites
particleboard
sliding friction
surface roughness
Opis:
Analysis of sliding friction of WC-Co composite on particleboard. The paper presents the analysis of the coefficient of friction at the contact area between WC-Co composite and particleboard. The four types of WC-Co composite in the form of milling indexable knives for wood materials machining were tested. The tests were carried out on a linear reciprocating tribotester (pin-on-flat), where the sample was the clearance surface of WC-Co indexable knives and the counter-sample was made of three-layer particleboard. Before and after tribological tests, the surface roughness of tested knives was measured. The highest values of friction coefficient were obtained for the type UMG04 of cemented carbide - with nano size of WC grains and the lowest content of cobalt. The average coefficient of friction for selected types of WC-Co correlated with the average increase in surface roughness (the roughness parameter Ry).
Analiza tarcia ślizgowego kompozytu WC-Co w kontakcie z płytą wiórową. Artykuł przedstawia analizę współczynnika tarcia na styku kompozyt WC-Co i płytay wiórowaej. Przebadano cztery rodzaje kompozytu WC-Co w postaci frezarskich noży wymiennych do obróbki materiałów drzewnych. Badania przeprowadzono na tribotesterze typu „trzpień po płaszczyźnie”, gdzie próbką była powierzchnia przyłożenia noża wymiennego WC-Co, a przeciwpróbką był trzpień wykonany z trójwarstwowej płyty wiórowej. Przed i po badaniach tribologicznych dokonano pomiaru chropowatości powierzchni badanych noży. Najwyższe wartości współczynnika tarcia uzyskano dla rodzaju węglika UMG04 o najdrobniejszych ziarnach WC i najniższej zawartości kobaltu. Średni współczynnik tarcia dla poszczególnych rodzajów WC-Co korelował ze średnim przyrostem chropowatości wyrażonej parametrem Ry.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2020, 111; 60--67
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of grain dust on the friction factor in sliding kinematic pairs of plastic - steel
Autorzy:
Szefler, J.
Weiner, W.
Powiązania:
https://bibliotekanauki.pl/articles/24401.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
grain-feed product
corn
sliding factor
dust
grain dust
Źródło:
International Agrophysics; 1999, 13, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dead-beat and reaching-law-based sliding-mode control of perishable inventory systems
Autorzy:
Ignaciuk, P.
Bartoszewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/202382.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sliding-mode control
inventory control
perishable inventories
discrete-time control systems
Opis:
In this paper we consider the problem of efficient control of inventory systems with perishable goods. In the analyzed setting the deteriorating stock at a distribution center used to fulfill unknown, time-varying demand is replenished with delay from a supply source. The challenging issue is to achieve the high service level with minimum costs when the replenishment orders are procured with lead-time delay spanning multiple review periods. On the contrary to the typical heuristic approaches, we apply formal methodology based on discrete-time sliding-mode (SM) control. The proposed SM controller with the sliding plane selected for a dead-beat scheme ensures that the maximum service level is obtained in the system with arbitrary delay and any bounded demand pattern. In order to account for the supplier capacity limitations in the systems with input constraints, we also develop an alternative control strategy based on reaching law. Both controllers achieve a given service level with smaller holding costs and reduced order-to-demand variance ratio as compared to the classical order-up-to policy.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 1; 39-49
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode tracking control for unmanned helicopter using extended disturbance observer
Autorzy:
Ullah, Ihsan
Pei, Hai-Long
Powiązania:
https://bibliotekanauki.pl/articles/229728.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unmanned helicopter
external disturbances
sliding mode control
extended disturbance observer
mismatched uncertainty
Opis:
This paper presents a robust control technique for small-scale unmanned helicopters to track predefined trajectories (velocities and heading) in the presence of bounded external disturbances. The controller design is based on the linearized state-space model of the helicopter. The multivariable dynamics of the helicopter is divided into two subsystems, longitudinallateral and heading-heave dynamics respectively. There is no strong coupling between these two subsystems and independent controllers are designed for each subsystem. The external disturbances and model mismatch in the longitudinal-lateral subsystem are present in all (matched and mismatched) channels. This model mismatch and external disturbances are estimated as lumped disturbances using extended disturbance observer and an extended disturbance observer based sliding mode controller is designed for it to counter the effect of these disturbances. In the case of heading-heave subsystem, external disturbances and model mismatch only occur in matched channels so a second order sliding mode controller is designed for it as it is insensitive to matched uncertainties. The control performance is successfully tested in Simulink.
Źródło:
Archives of Control Sciences; 2019, 29, 1; 169-199
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratoryjna ocena wpływu nacisku i prędkości ślizgania na intensywność zużycia stali obręczowej gatunku B6T przy suchym tarciu ślizgowym
Laboratory assessment of the influence of contact pressure and sliding speed on wear rate of a tyre steel grade B6T in dry sliding conditions
Autorzy:
Witaszek, M.
Witaszek, K.
Powiązania:
https://bibliotekanauki.pl/articles/198289.pdf
Data publikacji:
2008
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
prędkość ślizgania
stal obręczowa
B6T
suche tarcie ślizgowe
sliding speed
tyre steel
dry sliding conditions
Opis:
Koła kolejowe są odpowiedzialnymi elementami o dużym wpływie na bezpieczeństwo i niezawodność przewozów. Ich zużywanie, będące skutkiem tarcia pomiędzy kołami a szynami, jest ważną przyczyną utraty właściwości użytkowych. Zużywanie to zależy między innymi od takich czynników, jak nacisk i prędkość ślizgania. W pracy przedstawiono wyniki badań wpływu tych czynników na zużycie stali gatunku B6T stosowanej na obręcze kół lokomotyw.
Rail wheels are responsible elements with significant influence on the transport safety and reliability. Their wear, caused by a wheel - rail friction, is an important cause of wheels deterioration. This wear is strongly influenced by such factors as contact pressure and sliding velocity In the present work the influence of tat factors on dry, sliding wear of a tyre steel grade B6T is studied. This steel is used for locomotive tyres manufacturing.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2008, 64; 267-274
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding angle of repose and pickup velocity of chosen types of chipped wood
Autorzy:
Trofimov, Sergei
Rogoziński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2146678.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
chipped wood
mobility layer
sliding
inclined plane
lifting
horizontal duct
air velocity
Opis:
Sliding angle of repose and pickup velocity of chosen types of chipped wood. The report presents the results of the study of conditions sufficient for the motion or immobility of a layer of chipped wood on an inclined plane of sliding and the value of the air velocity in a horizontal duct for lifting or settling a layer of particles of bulk material. When performing the work, special laboratory units were used with adjustment of the angle of inclination of the sliding plane and air velocity in the pipeline. The results of experimental studies can be used to solve issues of transportation, bunkering and storage of some common species and types of chipped wood (sawdust, shavings, sanding dust).
Kąt zsypu i prędkość startu wybranych rodzajów rozdrobnionego drewna. W pracy przedstawiono wyniki badań warunków wystarczających do ruchu lub unieruchomienia warstwy rozdrobnionego drewna na nachylonej płaszczyźnie poślizgu oraz wartość prędkości powietrza w poziomym kanale do niezbędnej do startu warstwy cząstek materiału sypkiego. Podczas wykonywania prac zastosowano specjalne zestawy laboratoryjne z regulacją kąta nachylenia płaszczyzny poślizgu oraz prędkości powietrza w rurociągu. Wyniki badań eksperymentalnych można wykorzystać do rozwiązania problemów związanych z transportem i przechowywaniem niektórych gatunków i rodzajów rozdrobnionego drewna (trociny, wióry, pył szlifierski).
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2021, 113; 104--108
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode speed control of an induction motor drive using time-varying switching line
Autorzy:
Tarchała, G.
Powiązania:
https://bibliotekanauki.pl/articles/1193307.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sliding mode control
equivalent control
induction motor
speed controller
time-varying switching line
Opis:
An equivalent sliding mode control method of an induction motor speed has been discussed. The control signal consists of two parts: a continuous and discontinuous one. Very good dynamical response of the drive system has been obtained, which however changes influenced by external and parametric disturbances occurring under various operation conditions. In order to ensure identical dynamic performance of the speed transients and system robustness during the switching line reaching phase, regardless of external and parametric disturbances, the time-varying switching line is proposed. The simulation results have been validated by experimental tests of the induction motor drive system.
Źródło:
Power Electronics and Drives; 2017, 2, 37/1; 105-120
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of PI sliding mode control for Zeta DC-DC converter in PV system
Autorzy:
Hasanah, Rini Nur
Ardhenta, Lunde
Nurwati, Tri
Setyawati, Onny
Sawitri, Dian Retno
Suyono, Hadi
Taufik, Taufik
Powiązania:
https://bibliotekanauki.pl/articles/2173675.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photovoltaic
Zeta converter
sliding mode control
PI sliding surface
fotowoltaika
konwerter Zeta
sterowanie trybem przesuwnym
powierzchnia ślizgowa PI
Opis:
Solar energy has become one of the most potential alternative energies in the world. To convert solar energy into electricity, a photovoltaic (PV) system can be utilized. However, the fluctuation of sunlight intensity throughout the day greatly affects the generated energy in the PV system. A battery may be beneficial to store the generated energy for later use. A DC–DC converter is commonly exploited to produce a constant output voltage during the battery charging process. A Zeta converter is a DC–DC converter which can be used to produce output values above or below the input voltage without changing the polarity. To deal with the inherent non-linearity and time-varying properties of the converter, in this paper the sliding mode control (SMC) is first analyzed and exploited before being integrated with a proportional-integral (PI) control to regulate the output voltage of the PV system. Disturbances are given in the form of changes in input voltage, reference voltage, and load. Voltage deviation and recovery time to reach a steady-state condition of the output voltage after disturbances are investigated and compared to the results using a proportional-integral-differential (PID) controller. The results show that the proposed control design performs faster than the compared PID control method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e140952
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ANFIS-based PID continuous sliding mode controller for robot manipulators in joint space
Autorzy:
Elawady, Wael M.
Asar, Mohammed F.
Sarhan, Amany M.
Powiązania:
https://bibliotekanauki.pl/articles/1839129.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
PID
continuous sliding mode control
ANFIS
uncertainties
robot
Opis:
This paper presents a feasible design for a con- trol algorithm to synthesize an adaptive neuro-fuzzy inference system-based PID continuous sliding mode control system (ANFIS- PIDCSMC) for adaptive trajectory tracking control of the rigid robot manipulators (RRMs) in the joint space. First, a PID sliding mode control algorithm with sliding surface dynamics-based continuous proportional-integral (PI) control action (PIDSMC-SSDCPI) is presented. The global stability conditions are formulated in terms of Lyapunov full quadratic form such that the robot system output can track the desired reference output. Second, to increase the control system robustness, the PI control action in the PIDSMC- SSDCPI controller is supplanted by an ANFIS control signal to provide a control approach that can be termed adaptive neuro-fuzzy inference system-based PID continuous sliding mode control system (ANFIS-PIDCSMC). For the proposed control algorithm, numerical simulations using the dynamic model of RRM with uncertainties and external disturbances show high quality and effectiveness of the adopted control approach in high-speed trajectory tracking control problems. The simulation results that are compared with the results, obtained for the traditional controllers (standalone PID and traditional sliding mode controller (TSMC)), illustrate the fact that the tracking control behavior of the robot system achieves acceptable tracking performance.
Źródło:
Control and Cybernetics; 2019, 48, 4; 525-555
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on beam supply control strategy based on sliding mode control
Autorzy:
Zhang, Hao
Dong, Haiying
Zhang, Baoping
Wu, Tong
Chen, Changwen
Powiązania:
https://bibliotekanauki.pl/articles/141014.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
beam supply
DC/DC converter
robustness
sliding mode control
Opis:
In the hybrid multiple H-bridge topology of beam supply, the load change of a DC/DC full-bridge converter can greatly affect the output voltage during onsite operation. An improved sliding mode control (SMC) strategy is thus proposed in this paper, where the rate of switching control is added to the law of system equivalent control to create a law that can realize a complete sliding mode control. Considering the special operating conditions of the load can have an influence on the performance of the controller, the impact of uncertainty existing in onsite conditions is suppressed with the proposed strategy utilized. The validity of the proposed strategy, finally, is verified by simulation, which proves the outperformance of the system in both robustness and dynamics.
Źródło:
Archives of Electrical Engineering; 2020, 69, 2; 349-364
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High performance backstepping control of induction motor with adaptive sliding mode observer
Autorzy:
Bakhti, I.
Chaouch, S.
Maakouf, A.
Powiązania:
https://bibliotekanauki.pl/articles/229996.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
induction motor
backstepping control
sliding mode
flux observer design
estimation
sensorless control
Opis:
It is well known that modern control of induction motor relies on a good dynamic model of the motor. Extensive research and activity have been devoted to the problem of induction motor control over the last decade. In this paper we introduce backstepping control with amelioration of performance to guarantee stability of the system. Accurate knowledge of the rotor speed and flux position is the key factor in obtaining a high-performance and high-efficiency induction-motor drive. Thus a sliding mode observer design is presented. Simulation results are included to illustrate good performance of backstepping control of sensorless induction motors with flux observer.
Źródło:
Archives of Control Sciences; 2011, 21, 3; 331-344
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional Order Sliding Mode Speed Control of Feedback Linearized Induction Motor
Autorzy:
Fetene, Yeshiwas
Shibeshi, Dereje
Powiązania:
https://bibliotekanauki.pl/articles/1193868.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
induction motor
input-output feedback
linearization
fractional-order sliding mode controller
SVPWM
load torque observer
Opis:
Induction machines have of late become the most popular workhorses in the industry replacing DC machines because of their advantages, such as reduced cost, reliability and the absence of commutators, which make them adapt to unfavourable conditions with lower maintenance requirement. However, higher-order models of AC machines, nonlinearities in model equations, uncertainties in parameters and load disturbances make induction motors difficult to control than that of DC motors. In this paper, a robust control strategy considering the recent advances in technology is proposed employing input-output feedback linearization for the exact decoupling of electromagnetic torque and rotor flux using fractional-order sliding mode controller (SMC) for the outer speed loop. The sliding mode observer is also designed to extract the rotor flux from the DC input voltage of the inverter and stator current measurements. Finally, a comparison between the commonly used proportional integral and derivative (PID) controller and the proposed fractional-order SMCs is made and the conclusion is reached.
Źródło:
Power Electronics and Drives; 2020, 5, 40; 109-122
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and implementation of improved sliding mode controller on 6R manipulator
Autorzy:
Korayem, M. H.
Nekoo, S. R.
Khademi, A.
Abdollahi, F.
Powiązania:
https://bibliotekanauki.pl/articles/280702.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
improved sliding mode control
chattering
DLCC
hardware implementation
Opis:
In this work, we present an improved sliding mode control (ISMC) technique designed and implemented for control of 6R manipulator. Sliding mode control (SMC) is a well-known nonlinear robust method for controlling systems in the presence of uncertainties and disturbances and systems with complex dynamics as in manipulators. Despite this good property, it is difficult to implement this method for the manipulator with a complex structure and more than three degree-of-freedom because of the complicated and massive equation and chattering phenomenon as a property of SMC in control inputs. Here, the chattering phenomenon is eliminated by using an effective algorithm called ISMC and implemented to 6R manipulator by using a low-cost control board based on an ARM microcontroller with high accuracy and memory. The carrying load is considered as the uncertainty for the manipulator, while the dynamic load carrying capacity (DLCC) is considered as a robot performance criterion showing robustness of the controller. The results of simulations and experiments show that the proposed approach has a good performance and is suitable and practical to be applied for manipulators.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 265-280
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault identification in underwater vehicle thrusters via sliding mode observers
Autorzy:
Zuev, Alexander
Zhirabok, Alexey
Filaretov, Vladimir
Powiązania:
https://bibliotekanauki.pl/articles/1838162.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
underwater vehicle
thruster
fault identification
sliding mode observer
pojazd podwodny
identyfikacja uszkodzenia
sterowanie ślizgowe
Opis:
The paper is devoted to the problem of increasing the efficiency of underwater vehicles by using a fault diagnosis system for their thrusters which provides detection, isolation, and identification of minor faults. To address the problem, a two-stage method is proposed. At the first stage, a bank of diagnostic observers is designed to detect and isolate the emerging faults. Each observer in this bank is constructed to be sensitive to some set of faults and insensitive to others. At the second stage, additional observers working in sliding mode are synthesized in order to accurately estimate the error value in the signal obtained from the angular velocity sensor and to estimate deviations of the thruster parameters from their nominal values due to the faults. In contrast to the existing solutions, reduced-order (i.e., lower-dimensional) models of the original system are proposed as a basis to construct sliding mode observers. This approach permits reduction of the complexity of the obtained observers in comparison with the known methods, where full-order observers are constructed. The simulation results show the efficiency and high quality of all synthesized observers. In all cases considered, it was possible to detect typical faults, as well as estimate their values.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 4; 679-688
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ siły docisku zestyku na parametry zestyków ślizgowych stosowanych w elektrycznej trakcji kopalni miedzi
Influence of contact force on the performance of dc sliding contacts in copper mine electric rail transport
Autorzy:
Miedziński, B.
Okraszewski, Z.
Habrych, M.
Wandzio, J.
Powiązania:
https://bibliotekanauki.pl/articles/187016.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
Tematy:
parametry zestyków slizgowych
zestyk ślizgowy
performance of sliding contacts
sliding contact
Opis:
W artykule przedstawiono wyniki badań wpływu wartości siły docisku zestyku w stykach ślizgowych prądu stałego stosowanych w układach zasilania elektrycznej trakcji kopalnianej w kopalni miedzi na ich podstawowe parametry eksploatacyjne. Badania miały na celu znalezienie rozwiązania umożliwiającego zastąpienie dotychczas stosowanych ślizgów grafitowych, charakteryzujących się dużym zużyciem i uszkodzeniami mechanicznymi materiału, dużymi lokalnymi stratami energii i związanymi z nimi lokalnymi przegrzewaniami. Zaproponowano zastosowanie nowych ślizgów wykonanych z materiału kompozytowego miedź-molibden. Na podstawie przeprowadzonych badań sformułowano wnioski praktyczne odnośnie do efektywności wymiany ślizgów grafitowych na ślizgi wykonane z materiału kompozytowego typu Cu-Mo.
The paper features the test results of the influence of contact force on the basic performance parameters of DC sliding contacts used in the electric drives in copper mine electric rail transport. The tests aimed at finding a solution to replace the sliding contacts made of graphite which demonstrated excessive wear, mechanical damages of the material, significant local energy losses, and related local overheating. The new sliding contacts were proposed, made of a copper-molybdenum composite material. Based on the performed tests results, practical conclusions were drawn with respect to the efficiency of replacing the graphite sliding contacts with the contacts made of the copper-molybdenum composite material.
Źródło:
Mechanizacja i Automatyzacja Górnictwa; 2009, R. 47, nr 4, 4; 15-26
0208-7448
Pojawia się w:
Mechanizacja i Automatyzacja Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode speed control for multi-motors system
Autorzy:
Bouchiba, B.
Hazzab, A.
Glaoui, H.
Med-Karim, F.
Bousserhane, I. K.
Powiązania:
https://bibliotekanauki.pl/articles/384373.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
Multi-Motors systems
sliding mode control
proportional-integral (P1) control
Opis:
Continuous processes in the plastics, textile paper and other industries, require several drives working in synchronism. The aim of this paper is to control speed of the multi motors system, and to maintain a constant mechanical tension between the rollers of the system. Several controllers are considerer, including Proportional-Integral (PI) and sliding-mode control (SMC). Since the PI control method can be applied easily and is widely known, it has an important place in control applications. But this method is insensitive to parameter changes. The advantage of an SMC is its robustness and ability to handle the non-linear behaviour of the system, and is indicated in comparison with traditional proportional-integral (P1) control scheme. Theoretical analysis and simulation results are provided to evaluate the consistency and performances of this control technique (SMC).
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 3; 50-54
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model Predictive Super-twisting sliding mode control for an autonomous surface vehicle
Autorzy:
Esfahani, Hossein Nejatbakhsh
Szlapczynski, Rafal
Powiązania:
https://bibliotekanauki.pl/articles/260526.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
utonomous Surface Vehicle
Model Predictive Control
Sliding Mode Control
Super-Twisting Algorithm
Chattering Attenuation
Opis:
This paper presents a new robust Model Predictive Control (MPC) algorithm for trajectory tracking of an Autonomous Surface Vehicle (ASV) in presence of the time-varying external disturbances including winds, waves and ocean currents as well as dynamical uncertainties. For fulfilling the robustness property, a sliding mode control-based procedure for designing of MPC and a super-twisting term are adopted. The MPC algorithm has been known as an effective approach for the implementation simplicity and its fast dynamic response. The proposed hybrid controller has been implemented in MATLAB / Simulink environment. The results for the combined Model Predictive Super-Twisting Sliding Mode Control (MP-STSMC) algorithm have shown that it significantly outperforms conventional MPC algorithm in terms of the transient response, robustness and steady state response and presents an effective chattering attenuation in comparison with the Super-Twisting Sliding Mode Control (STSMC) algorithm.
Źródło:
Polish Maritime Research; 2019, 3; 163-171
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finding opportunity windows in time series data using the sliding window technique: The case of stock exchanges
Wykorzystanie techniki sliding window w danych z szeregów czasowych. Przykład giełd papierów wartościowych
Autorzy:
Gürsakal, Necmi
Yilmaz, Fırat Melih
Uğurlu, Erginbay
Powiązania:
https://bibliotekanauki.pl/articles/424798.pdf
Data publikacji:
2020
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
time series
data science
patterns
sliding window
szeregi czasowe
nauka o danych
wzorce
Opis:
Data have shapes, and human intelligence and perception have to classify the forms of data to understand and interpret them. This article uses a sliding window technique and the main aim is to answer two questions. Is there an opportunity window in time series of stock exchange index? The second question is how to find a way to use the opportunity window if there is one. The authors defined the term opportunity window as a window that is generated in the sliding window technique and can be used for forecasting. In analysis, the study determined the different frequencies and explained how to evaluate opportunity windows embedded using time series data for the S&P 500, the DJIA, and the Russell 2000 indices. As a result, for the S&P 500 the last days of the patterns 0111, 1100, 0011; for the DJIA the last days of the patterns 0101, 1001, 0011; and finally for the Russell 2000, the last days of the patterns 0100, 1001, 1100 are opportunity windows for prediction.
Dane mają swoje formy, a ludzka inteligencja i pojmowanie muszą klasyfikować te formy w celu ich zrozumienia i interpretacji. W niniejszym artykule stosuje się technikę rozsuwanego okna (sliding window) i podejmuje próbę odpowiedzi na dwa pytania: czy możliwe jest pojawienie się szansy (opportunity window) w szeregach czasowych ideksów giełdowych; jak znaleźć sposób na wykorzystanie pojawiającej się okazji, jeśli taka istnieje. Autorzy zdefiniowali pojęcie opportunity window jako okazja (otwarcie) wygenerowana w technice sliding window, która może być zastosowana w prognozowaniu. Szukając odpowiedzi, autorzy określili częstotliwości na 3, 4 i 5 długościach wzorców skierowanych w górę i w dół oraz wyjaśnili, jak oszacować okazje osadzone przy użyciu danych szeregów czasowych dla giełd S&P 500, DJIA i Russell 2000. W rezultacie dla S&P 500 ostatnie dni wzorców 0111,1100,0011, dla DJIA ostatnie dni dla 0101, 1001, 0011 oraz dla Russell 2000 ostatnie dni dla 0100, 1001 i 1100 stanowią okazję dla prognozy.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2020, 24, 3; 1-19
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Firefly algorithm optimization of manipulator robotic control based on fast terminal sliding mode
Autorzy:
Mallem, Ali
Douak, Fouzi
Benaziza, Walid
Bounouara, Asma
Powiązania:
https://bibliotekanauki.pl/articles/27314236.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
manipulator robotic
fast terminal sliding mode
firefly algorithm
Lyapunov stability
Opis:
In this paper a new algorithm of optimization in the field of manipulator robotic control is presented. The proposed control approach is based on fast terminal sliding mode control (FTSMC), in order to guarantee the convergence of the position articulations errors to zero in finite time without chattering phenomena, and the Firefly algorithm in order to generate the optimal parameters that ensure minimum reaching time and mean square error and achieve better performances. This ensures the asymptotic stability of the system using a Lyapunov candidate in the presence of disturbances. The simulations are applied on a two-link robotic manipulator with different tracking references by using Matlab/ Simulink. Results show the efficiency and confirm the robustness of the proposed control strategy.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 4; 44--52
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding Mode Control for a Gyroscope System
Sterowanie ślizgowe układem giroskopowym
Autorzy:
Krzysztofik, I.
Koruba, Z.
Powiązania:
https://bibliotekanauki.pl/articles/403831.pdf
Data publikacji:
2017
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
mechanical engineering
controlled gyroscope
sliding mode controller
dynamics
control
mechanika
giroskop sterowany
regulator ślizgowy
dynamika
sterowanie
Opis:
This paper presents a mathematical model of a gyroscope system with a sliding mode controller. A comparative analysis based on various control algorithms implemented in a controlled gyroscope system installed on a mobile platform (such as an UAV or a homing rocket missile) proved that sliding mode control can be highly effective, especially when external input interferences exist with the kinematic reactions of the mobile platform. A gyroscope system with a sliding mode controller can be used in the optical target seeker systems of precision weapons. The simulation results are provided in a graphical format.
W pracy przedstawiono model matematyczny układu giroskopowego wraz z regulatorem ślizgowym. Analiza porównawcza różnych algorytmów sterowania zastosowanych w sterowanym układzie giroskopowym umieszczonym na ruchomej podstawie (np. na pokładzie bezzałogowego aparatu latającego lub samonaprowadzającego pocisku rakietowego) wykazała, że najbardziej efektywne jest sterowanie ślizgowe, zwłaszcza w warunkach występowania zakłóceń zewnętrznych i kinematycznego oddziaływania podłoża. Tego rodzaju układ może znaleźć zastosowanie w optycznych koordynatorach celu broni precyzyjnego rażenia. Wyniki badań symulacyjnych przedstawione zostały w graficznej postaci.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2017, 8, 4 (30); 47-60
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust continuous third-order finite time sliding mode controllers for exoskeleton robot
Autorzy:
Fellag, Ratiba
Guiatni, Mohamed
Hamerlain, Mustapha
Achour, Noura
Powiązania:
https://bibliotekanauki.pl/articles/1845025.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
exoskeleton robot
higher order
sliding control
homogeneous
robust
trajectory tracking
rehabilitation
Opis:
In this work, continuous third-order sliding mode controllers are presented to control a five degrees-of-freedom (5-DOF) exoskeleton robot. This latter is used in physiotherapy rehabilitation of upper extremities. The aspiration is to assist the movements of patients with severe motor limitations. The control objective is then to design adept controllers to follow desired trajectories smoothly and precisely. Accordingly, it is proposed, in this work, a class of homogeneous algorithms of sliding modes having finite-time convergence properties of the states. They provide continuous control signals and are robust regardless of non-modeled dynamics, uncertainties and external disturbances. A comparative study with a robust finite-time sliding mode controller proposed in literature is performed. Simulations are accomplished to investigate the efficacy of these algorithms and the obtained results are analyzed.
Źródło:
Archive of Mechanical Engineering; 2021, LXVIII, 4; 395-414
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A reference trajectory based discrete time sliding mode control strategy
Autorzy:
Bartoszewicz, Andrzej
Adamiak, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/330438.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
discrete time system
sliding mode control
reaching law
reference trajectory
układ dyskretno czasowy
sterowanie ślizgowe
trajektoria referencyjna
Opis:
This study presents a new, reference trajectory based sliding mode control strategy for disturbed discrete time dynamical systems. The desired trajectory, which is generated externally according to an existing switching type reaching law, determines the properties of the emerging sliding motion of the system. It is proved that an appropriate choice of the trajectory generator parameters ensures the existence of the quasi-sliding motion of the system according to the definition by Gao et al. (1995) in spite of the influence of disturbances. Moreover, the paper shows that the application of the desired trajectory based reaching law results in a significant reduction in the quasi-sliding mode band width and errors of all state variables. Therefore, in comparison with Gao’s control method, the system’s robustness is increased. The paper also presents an additional modification of the reaching law, which guarantees a further reduction in the quasi-sliding mode band in the case of slowly varying disturbances. The results are confirmed with a simulation example.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2019, 29, 3; 517-525
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computation method for analysis of sliding faults in power systems
Autorzy:
Machowski, Jan
Robak, Sylwester
Powiązania:
https://bibliotekanauki.pl/articles/2090700.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power system
short-circuit analysis
sliding faults
computation method
system zasilania
analiza zwarć
wady ślizgowe
metody obliczeniowe
Opis:
Short-circuit analysis is conducted based on the nodal impedance matrix, which is the inversion of the nodal admittance matrix. If analysis is conducted for sliding faults, then for each fault location four elements of the nodal admittance matrix are subject to changes and the calculation of the admittance matrix inversion needs to be repeated many times. For large-scale networks such an approach is time consuming and unsatisfactory. This paper proves that for each new fault location a new impedance matrix can be found without recalculation of the matrix inversion. It can be found by a simple extension of the initial nodal impedance matrix calculated once for the input model of the network. This paper derives formulas suitable for such an extension and presents a flowchart of the computational method. Numerical tests performed for a test power system confirm the validity and usefulness of the proposed method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e135841, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przegląd reguł osiągania trybu ślizgowego w układach dyskretnych
Review of Discrete Time Sliding Mode Reaching Laws
Autorzy:
Leśniewski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/275580.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
dyskretne sterowanie ślizgowe
reguły osiągania trybu ślizgowego
discrete sliding mode control
reaching laws
Opis:
Stosując znane reguły osiągania trybu ślizgowego, rozpoczyna się działanie od określenia pożądanego przebiegu zmiennej ślizgowej. Następnie projektowany jest regulator gwarantujący, że zmienna ślizgowa układu będzie podążać za wybranym przebiegiem. Przewagą tej metody nad „klasycznym” sterowaniem ślizgowym jest zapewnienie lepszej kontroli nad dynamiką układu i spełnienie ograniczeń zmiennych stanu już podczas fazy osiągania trybu ślizgowego. W artykule przedstawiony zostanie przegląd prac naukowych dotyczących reguł osiągania trybu ślizgowego dla układów czasu dyskretnego. Wskazane i omówione zostaną różnice i podobieństwa między przebiegami stosowanymi przez badaczy.
In the reaching law approach one first specifies the desired evolution of the sliding variable. Then, a sliding mode controller that ensures this evolution is derived. The main advantage of this method with respect to “classical” sliding mode control is better control of the system dynamics and state constraints during the reaching phase. In this paper, a review of recent results on discrete time reaching laws is presented. The differences and similarities between them are discussed.
Źródło:
Pomiary Automatyka Robotyka; 2019, 23, 3; 17-25
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Backstepping sliding mode controller improved with fuzzy logic: Application to the quadrotor helicopter
Autorzy:
Zeghlache, S.
Saigaa, D.
Harrag, A.
Kara, K.
Bouguerra, A.
Powiązania:
https://bibliotekanauki.pl/articles/229480.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuzzy sliding mode
backstepping
quadrotor helicopter
dynamic modeling
Opis:
n this paper we present a new design method for the fight control of an autonomous quadrotor helicopter based on fuzzy sliding mode control using backstepping approach. Due to the underactuated property of the quadrotor helicopter, the controller can move three positions (x;y; z) of the helicopter and the yaw angle to their desired values and stabilize the pitch and roll angles. A first-order nonlinear sliding surface is obtained using the backstepping technique, on which the developed sliding mode controller is based. Mathematical development for the stability and convergence of the system is presented. The main purpose is to eliminate the chattering phenomenon. Thus we have used a fuzzy logic control to generate the hitting control signal. The performances of the nonlinear control method are evaluated by simulation and the results demonstrate the effectiveness of the proposed control strategy for the quadrotor helicopter in vertical flights.
Źródło:
Archives of Control Sciences; 2012, 22, 3; 315-342
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computation method for analysis of sliding faults in power systems
Autorzy:
Machowski, Jan
Robak, Sylwester
Powiązania:
https://bibliotekanauki.pl/articles/2173554.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power system
short-circuit analysis
sliding faults
computation method
system zasilania
analiza zwarć
wady ślizgowe
metody obliczeniowe
Opis:
Short-circuit analysis is conducted based on the nodal impedance matrix, which is the inversion of the nodal admittance matrix. If analysis is conducted for sliding faults, then for each fault location four elements of the nodal admittance matrix are subject to changes and the calculation of the admittance matrix inversion needs to be repeated many times. For large-scale networks such an approach is time consuming and unsatisfactory. This paper proves that for each new fault location a new impedance matrix can be found without recalculation of the matrix inversion. It can be found by a simple extension of the initial nodal impedance matrix calculated once for the input model of the network. This paper derives formulas suitable for such an extension and presents a flowchart of the computational method. Numerical tests performed for a test power system confirm the validity and usefulness of the proposed method.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e135841
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sterowanie ślizgowe w układzie połączonych zbiorników
Sliding mode control in coupled tanks system
Autorzy:
Tomera, M.
Powiązania:
https://bibliotekanauki.pl/articles/266572.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
sterowanie ślizgowe
rozszerzony filtr Kalmana
układ połączonych zbiorników
sliding mode control
extended Kalman filter
coupled tank systems
Opis:
W pracy przedstawiony został układ regulacji poziomu wody wykorzystujący sterowanie ślizgowe. Zaprezentowany algorytm sterowania ślizgowego opiera się na nieliniowej powierzchni ślizgania pierwszego rzędu. Niedogodnością sterowania ślizgowego są efekty częstych przełączeń sygnału sterowania, co niekorzystnie wpływa na trwałość i pracę urządzenia wykonawczego, w tym przypadku pompy. W celu usunięcia tej niedogodności w regulatorze ślizgowym, zamiast funkcji przekaźnikowej została zastosowana funkcja ograniczająca, wprowadzająca warstwę graniczną na powierzchni ślizgowej, co powoduje zlikwidowanie oscylacji (chatteringu). Na działanie algorytmu sterowania ślizgowego bardzo niekorzystnie wpływają również szumy pomiarowe, które usunięte zostały poprzez zastosowanie rozszerzonego filtru Kalmana. Ocena jakości pracy zaprojektowanego regulatora ślizgowego przeprowadzona została w oparciu o badania symulacyjne. Uzyskaną jakość pracy zaprojektowanego regulatora ślizgowego porównano z układem równoważnym zawierającym regulator liniowy PID.
The paper presents a system to control water level using sliding mode. The presented sliding mode control algorithm is based on a non-linear sliding surface of the first order. The drawback of sliding mode control are effects of frequent switching of control signal, what adversely affects the stability and the operation of the actuator, in this case the pump. In order to remove this drawback in the slide control instead of the relay function, the limiting function was applied, introducing a constraining layer on the slide surface, thereby causing chattering. The behavior of the sliding mode control algorithm is very adversely affected by the measurement noises, which were removed using the extended Kalman filter. Evaluation of the work quality of designed sliding mode control was carried out based on the simulation test. Obtained work quality of the designed sliding mode control was compared with the equivalent system containing linear PID controller.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2014, 40; 111-118
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł

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