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    Wyświetlanie 1-13 z 13
    Tytuł:
    Tuning P-PI and PI-PI controllers for electrical servos
    Autorzy:
    Żabiński, T.
    Trybus, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/199930.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    servomechanism
    tuning
    root locus
    P-PI
    PI-PI
    PID controllers
    tracking
    Opis:
    Tuning rules for position and velocity controllers in P-PI and PI-PI electrical servomechanisms are developed using the root locus design method. P-PI controller is equivalent to PID controller with a set-point filter. PI-PI servo provides zero steady-state error for linear disturbances, which may be important for some tracking tasks. Three design data are needed to calculate the tunings, i.e. drive gain, settling time and control cycle. The development begins with continuous controllers for better understanding. Closed-loop transfer functions involve real multiple poles, so the responses are smooth, without overshoot. Upper limits on control cycles as fractions of settling times are given. Some experimental results are presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 51-58
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unified design method of time delayed PI controller for first order plus dead-time process models with different dead-time to time constant ratio
    Autorzy:
    Pathiran, Arun R.
    Muniraj, R.
    Iruthayarajan, M. Willjuice
    Prabhu, S. R. Boselin
    Jarin, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1409359.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PI controller
    time delayed PI controller
    dead-time compensation
    Opis:
    The time delay element present in the PI controller brings dead-time compensation capability and shows improved performance for dead-time processes. However, design of robust time delayed PI controller needs much responsiveness for uncertainty in dead-time processes. Hence in this paper, robustness of time delayed PI controller has been analyzed for First Order plus Dead-Time (FOPDT) process model. The process having dead-time greater than three times of time constant is very sensitive to dead-time variation. A first order filter is introduced to ensure robustness. Furthermore, integral time constant of time delayed PI controller is modified to attain better regulatory performance for the lag-dominant processes. The FOPDT process models are classified into dead-time/lag dominated on the basis of dead-time to time constant ratio. A unified tuning method is developed for processes with a number of dead-time to time constant ratio. Several simulation examples and experimental evaluation are exhibited to show the efficiency of the proposed unified tuning technique. The applicability to the process models other than FOPDT such as high-order, integrating, right half plane zero systems are also demonstrated via simulation examples.
    Źródło:
    Archives of Control Sciences; 2021, 31, 2; 447-476
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust control system design in frequency domain
    Autorzy:
    Veselý, V
    Osuský, J
    Powiązania:
    https://bibliotekanauki.pl/articles/964036.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid control
    equivalent subsystem method
    PI controller
    Opis:
    In this paper two robust control methods for hybrid system are presented. Both methods are usefull for SISO and MIMO systems. Controller design procedure is developed in frequency domain. Equivalent subsystem method is used for controller design in this paper. Stability condition of proposed methods bases on small gain theory and uses additive and inverse additive model type. Two tank water system is presented in the paper and serves as a numerical example to compare effectiveness of described methods.
    Źródło:
    Archives of Control Sciences; 2013, 23, 1; 61-78
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identifying the optimal controller strategy for DC motors
    Autorzy:
    Qader, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140815.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DC Motor
    LQR
    PID
    PI
    controller strategy
    Opis:
    The aim of this study is to design a control strategy for the angular rate (speed) of a DC motor by varying the terminal voltage. This paper describes various designs for the control of direct current (DC) motors. We derive a transfer function for the system and connect it to a controller as feedback, taking the applied voltage as the system input and the angular velocity as the output. Different strategies combining proportional, integral, and derivative controllers along with phase lag compensators and lead integral compensators are investigated alongside the linear quadratic regulator. For each controller transfer function, the step response, root locus, and Bode plot are analysed to ascertain the behaviour of the system, and the results are compared to identify the optimal strategy. It is found that the linear quadratic controller provides the best overall performance in terms of steady-state error, response time, and system stability. The purpose of the study that took place was to design the most appropriate controller for the steadiness of DC motors. Throughout this study, analytical means like tuning methods, loop control, and stability criteria were adopted. The reason for this was to suffice the preconditions and obligations. Furthermore, for the sake of verifying the legitimacy of the controller results, modelling by MATLAB and Simulink was practiced on every controller.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 1; 101-114
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    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:
    Crowd Size Estimation and Detecting Social Distancing using Raspberry Pi and OpenCV
    Autorzy:
    Milton, Davidson Kamala Dhas
    Velraj, Arun Ra
    Powiązania:
    https://bibliotekanauki.pl/articles/2200720.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Haar features
    human detection
    distance checking
    raspberry pi
    opencv
    Opis:
    In this covid19 pandemic the number of people gathering at public places and festivals are restricted and maintaining social distancing is practiced throughout the world. Managing the crowd is always a challenging task. It requires monitoring technology. In this paper, we develop a device that detects and provide human count and detects people who are not maintaining social distancing. The work depicted above was finished using a Raspberry Pi 3 board with OpenCV-Python. This method can effectively manage crowds.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 1; 19--24
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Economical methods for measuring road surface roughness
    Autorzy:
    Grabowski, D.
    Szczodrak, M.
    Czyżewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/221297.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    image processing
    neural networks
    pothole detection
    Kinect
    Raspberry Pi
    Opis:
    Two low-cost methods of estimating the road surface condition are presented in the paper, the first one based on the use of accelerometers and the other on the analysis of images acquired from cameras installed in a vehicle. In the first method, miniature positioning and accelerometer sensors are used for evaluation of the road surface roughness. The device designed for installation in vehicles is composed of a GPS receiver and a multi-axis accelerometer. The measurement data were collected from recorded ride sessions taken place on diversified road surface roughness conditions and at varied vehicle speeds on each of examined road sections. The data were gathered for various vehicle body types and afterwards successful attempts were made in constructing the road surface classification employing the created algorithm. In turn, in the video method, a set of algorithms processing images from a depth camera and RGB cameras were created. A representative sample of the material to be analysed was obtained and a neural network model for classification of road defects was trained. The research has shown high effectiveness of applying the digital image processing to rejection of images of undamaged surface, exceeding 80%. Average effectiveness of identification of road defects amounted to 70%. The paper presents the methods of collecting and processing the data related to surface damage as well as the results of analyses and conclusions.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 533-549
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical Remarks on Power Consumption in WLAN Access Points
    Autorzy:
    Kowal, Michał
    Staniec, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/227224.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    802.11n
    beacon
    power consumption
    Raspberry Pi3
    OpenWrt
    Opis:
    The article presents the power consumptions measurements performed for three wireless routers operating in IEEE 802.11n standard. A typical consumer-class device Asus RTAC66U was chosen, an operator-class Gateworks Laguna GW2387 and a router built based on the Raspberry Pi3 platform. The aim of experiments was to test the influence of the beacon interframe interval, a client association (joining) in the network and the transmission itself, on the lifetime of battery-powered devices. Theoretical calculations were also performed for the influence of the analyzed scenarios on the battery-powered devices.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 173-178
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical and simulation modeling of dual active bridge
    Autorzy:
    Barlik, Roman
    Grzejszczak, Piotr
    Koszel, Mikołaj
    Powiązania:
    https://bibliotekanauki.pl/articles/2173709.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dual active bridge
    small-signal analysis
    averaged model
    transfer function
    parasitics
    PI controller
    podwójny mostek aktywny
    analiza małosygnałowa
    model uśredniony
    funkcja przenoszenia
    pasożyty
    regulator PI
    Opis:
    The paper is a structured, in-depth analysis of dual active bridge modeling. In the research new, profound dual active bridge converter (DAB) circuit model is presented. Contrary to already described idealized models, all critical elements including numerous parasitic components were described. The novelty is the consideration of a threshold voltage of diodes and transistors in the converter equations. Furthermore, a lossy model of leakage inductance in an AC circuit is also included. Based on the circuit equations, a small-signal dual active bridge converter model is described. That led to developing control of the input and output transfer function of the dual active bridge converter model. The comparison of the idealized model, circuit simulation (PLECS), and an experimental model was conducted methodically and confirmed the high compatibility of the introduced mathematical model with the experimental one. Proposed transfer functions can be used when designing control of systems containing multiple converters accelerating the design process, and accurately reproducing the existing systems, which was also reported in the paper.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e142653
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Telomerase enhances osteogenic ifferentiation of sheep bone marrow mesenchymal stem cells (BMSCs) by up-regulating PI3K/Akt pathway in vitro
    Autorzy:
    Zhu, X.
    Zhou, L.
    Liu, Z.
    Chen, X.
    Wei, L.
    Zhang, Z.
    Liu, Y.
    Zhu, Y.
    Wang, Y.
    Yang, X.
    Han, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087304.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bone marrow mesenchymal stem cells
    telomerase
    proliferation
    osteogenic differentiation
    PI3K/Akt signalling pathway
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 3; 359-372
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of protective and stabilizing controllers: a study with considering natural events
    Autorzy:
    Ganji, E.
    Mahdavian, M.
    Shirzadi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/141493.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wind turbine
    error detection system
    output stability of the turbine
    crow bar circuit
    tuning PI controllers
    power quality
    Opis:
    In renewable systems, there may be conditions that can be either network error or power transmission line and environmental conditions such as when the wind speed is unbalanced and the wind turbine is connected to the grid. In this case, the control system is not damaged and will remain stable in the power transmission system. Voltage stability studies on an independent wind turbine at fault time and after fixing the error is one of the topics that can strengthen the future of independent collections. At the time of the fault, the network current increases dramatically, resulting in a higher voltage drop. Hence the talk of fast voltage recovery during error and after fixing the error and protection of rotor and grid side converters against the fault current and also protection against rising DC voltage (which sharply increases during error) is highly regarded. So, several improvements have been made to the construction of a doubly-fed induction generator (DFIG) turbine such as: a) error detection system, b) DC link protection, c) crow bar circuit, d) block of the rotor and stator side converters, e) injecting reactive power during error, f) nonlinear control design for turbine blades, g) tuning and harmonization of controllers used to keep up the power quality and to stabilize the system output voltage in the power grid. First, the dynamic models of a wind turbine, gearbox, and DFIG are presented. Then the controllers are modeled. The results of the simulation have been validated in MATLAB/Simulink.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 4; 869-884
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study based on proportional integral and backstepping controllers for doubly fed induction generator used in wind energy conversion system
    Autorzy:
    Moumani, Youssef
    Laafou, Abdeslam Jabal
    Madi, Abdessalam Ait
    Powiązania:
    https://bibliotekanauki.pl/articles/2202553.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    backstepping control
    control
    Doubly FedInduction
    Grid Side Converter
    MPPT
    Maximum Power Point Tracking
    PI
    Rotor Side Converter
    wind turbine
    Opis:
    This paper presents a comparative study between the conventional PI (Proportional Integral) and backstepping controllers applied to the DFIG (Doubly Fed Induction Generator) used in WECS (Wind Energy Conversion System). These two different control strategies proposed in this work are developed to control the active and reactive power of the DFIG on the one hand, and to maintain the DC-link voltage constant for the inverting function on the other hand. This is ensured by generating control signals for two power electronic converters, RSC (Rotor Side Converter) and GSC (Grid Side Converter). In order to optimise the power production in the WT (Wind Turbine), an MPPT (Maximum Power Point Tracking) algorithm is applied along with each control technique. To simulate the effectiveness of the proposed controllers, MATLAB/Simulink Software is used, and the obtained results are analysed and discussed to compare PI and backstepping controllers in terms of robustness against wind speed variations and tracking performance in dynamic and steady states.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 1; 211--228
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximation models for the evaluation of TCP/AQM networks
    Autorzy:
    Marek, Dariusz
    Domański, Adam
    Domańska, Joanna
    Szyguła, Jakub
    Czachórski, Tadeusz
    Klamka, Jerzy
    Filus, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2173690.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diffusion approximation
    active queue management
    AQM
    congestion control
    dropping packets
    fluid flow approximation
    FFA
    non-integer order PIγ controller
    G/G/1/N queueing model
    przybliżenie dyfuzji
    aktywne zarządzanie kolejką
    kontrola zatorów
    upuszczanie pakietów
    przybliżenie przepływu płynu
    model kolejkowania G/G/1/N
    Opis:
    The article proposes a model in which Diffusion Approximation is used to analyse the TCP/AQM transmission mechanism in a multinode computer network. In order to prevent traffic congestion, routers implement AQM (Active Queue Management) algorithms. We investigate the influence of using RED-based AQM mechanisms and the fractional controller PIγ on the transport layer. Additionally, we examine the cases in which the TCP and the UDP flows occur and analyse their mutual influence. Both transport protocols used are independent and work simultaneously. We compare our solution with the Fluid Flow approximation, demonstrating the advantages of Diffusion Approximation.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141986
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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