Relevant bibliographies by topics / Controlled frequency filter

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Controlled frequency filter'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Controlled frequency filter"

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Lan, Qiao Qian, Min Hui Xu, and Wei Jian Jin. "Design of High Frequency Program-Controlled Filter." Applied Mechanics and Materials 226-228 (November 2012): 2480–83. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.2480.

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In order to meet the requirements of most controllable filters of the high frequency of the system , this paper introduces a kind of programmable filter designing based on MAX262, and discuss the method of realizing , in the case of full comprehending the theory of filers, using Multisim to simulate. Analysing the simulation results of the output, it shows that this scheme of filter designing is good, the center frequency and the storage factor Q can be programmed to control ,in order to apply to varieties of frequency band filtering in signal detection.
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Abdolvand, Reza, and Farrokh Ayazi. "High-frequency monolithic thin-film piezoelectric-on-substrate filters." International Journal of Microwave and Wireless Technologies 1, no. 1 (February 2009): 29–35. http://dx.doi.org/10.1017/s175907870900004x.

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A class of micromachined acoustic filters is presented in which the number of individual resonant structures is reduced to 1 (monolithic filter). This resonant structure is comprised of a stack of thin-film piezoelectric-on-silicon. Symmetric and anti-symmetric resonance modes (dual modes) of the silicon structure are piezoelectrically excited and coupled to realize a 2-pole narrowband filter. High-order lateral bulk acoustic resonance modes of a rectangular plate are utilized to design dispersed-frequency UHF filters fabricated on a single substrate. Thickness mode filters are also realized at GHz frequencies using a new interdigitated electrode design. Additionally, it is shown that the filter bandwidth can be controlled by changing the dimensions of the resonant structure and the electrode pattern. Narrowband lateral mode filters with filter Q’s larger than 300 at ~440 MHz and thickness mode filters with filter Q’s in the range of 150–900 at ~3.1 GHz are demonstrated.
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Naydenov, Borislav Georgiev, Antim Hristov Yordanov, and Lyubomir Petrov Kamburov. "Mathematical model of parametrically controlled matched filters." ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 1, no. 1 (December 28, 2017): 27–31. http://dx.doi.org/10.29114/ajtuv.vol1.iss1.60.

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A one model of parametrically controlled coherent filters is described and analyzed, applied also in radar systems and mobile communication systems to improve noise resistance. Application of the Nyquist-Shannon theorem in the frequency domain to obtain a set of frequency filters with variable parameters. The conversion of the signal at the output of the parameter filter using the auto correlation feature is shown when a normal white noise occurs.
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Joelianto, Endra. "On Minimal Second-order IIR Bandpass Filters with Constrained Poles and Zeros." Journal of Engineering and Technological Sciences 53, no. 4 (August 3, 2021): 210401. http://dx.doi.org/10.5614/j.eng.technol.sci.2021.53.4.1.

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In this paper, several forms of infinite impulse response (IIR) bandpass filters with constrained poles and zeros are presented and compared. The comparison includes the filter structure, the frequency ranges and a number of controlled parameters that affect computational efforts. Using the relationship between bandpass and notch filters, the two presented filters were originally developed for notch filters. This paper also proposes a second-order IIR bandpass filter structure that constrains poles and zeros and can be used as a minimal parameter adaptive digital second-order filter. The proposed filter has a wider frequency range and more flexibility in the range values of the adaptation parameters.
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Ma, Sheng Qian, Chang Rong Zhao, and Yan Ping Ji. "HF Voltage-Controllable Band-Pass Filter Based on Varactor." Applied Mechanics and Materials 631-632 (September 2014): 327–32. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.327.

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Varactor to replace commonly variable capacitance is applied to the tuner. This paper presents the voltage-controllable band-pass filter design method. The filter constitutes of operational amplifier, resistors, varactor MV209 and parallel LC resonant circuit. Center frequency range of the band-pass filters is from 19MHz to 25MHz controlled with DC voltage. It derives the transfer function of the filter and function expression of junction capacitance with reverse voltage. The frequency response of filter simulation and experimental results are given. Key words: Varactor; Band-Pass Filter; Voltage-Controllable Filter; Junction Capacitance
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Gan, Huijun, Dongsheng Yu, Dongkun Li, and He Cheng. "Binary memcapacitor based first-order active filter." Circuit World 46, no. 2 (January 10, 2020): 117–24. http://dx.doi.org/10.1108/cw-06-2019-0061.

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Purpose The purpose of this paper is to construct a flux-controlled memcapacitor (MC) emulator without grounded restriction with the binary operation ability. The active first-order low-pass filter (LPF) and high-pass filter (HPF) circuits are constructed by replacing the capacitor with MC. Design/methodology/approach The output saturation of the active device is innovatively adopted to realize the binary operation of MC with two memcapacitance values. By applying the direct current control voltage together with the input signal, the memcapacitance can be controlled, and hence, cut-off frequency of the filters can be adjusted without changing the circuit structure. Findings Experiments and simulation results show that the new filter has good frequency selectivity. Both LPF and HPF can change the cut-off frequency by changing the positive and negative control voltage. The experimental and simulation results are in good agreement with the theoretical analysis, which proves the feasibility and validity of the emulator and the filters. Originality/value These MC emulators are simple and easy to physically fabricate, which have been increasingly used for experiment. It also provide an effective reference for device miniaturization and low power consumption.
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Ma, Sheng Qian, Yan Ping Ji, Xing Ping Ran, Wei Zhao Zhang, and Yang Yang. "Design of the Voltage-Controlled Bandpass Filter Based on Current Feedback Op Amp." Advanced Materials Research 986-987 (July 2014): 1081–85. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1081.

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This paper puts forward structure and realization method of the voltage-controlled band-pass filter based on the current feedback operational amplifier (CFA) which uses bi-quad loop filter circuit model to design the new filter circuit. Input voltage signal is input to voltage-controlled band-pass filter circuit composed by an analog multiplier AD835 and a current feedback operational amplifier AD8001 which are the core. Using the voltage signal to adjust the center frequency of the filter, the filter has wide frequency band and good high-frequency performance. This paper describes the design principles, infers the design formulas and designs the circuit of the voltage-controlled first-order and second-order band-pass filter.Through the simulation, the filter can realize the scope of the center frequency from 200KHz to 10MHz.
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Azad, Amit Ranjan, and Akhilesh Mohan. "Compact bandpass filter with wide-stopband using substrate integrated waveguide cavities and short-circuited coplanar line." International Journal of Microwave and Wireless Technologies 12, no. 5 (November 26, 2019): 345–51. http://dx.doi.org/10.1017/s175907871900148x.

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AbstractThis article presented a compact bandpass filter with wide-stopband performance. Two substrate integrated waveguide (SIW) cavities and a short-circuited coplanar line introduced between the two cavities are used to realize a compact third-order bandpass filter. The passband is generated by combining the resonant frequency of TE101 mode of the SIW cavities and the fundamental resonant frequency of the short-circuited coplanar line. The size of the proposed filter reduces significantly in comparison with conventional third-order SIW filters. Moreover, the center frequency (CF) and the bandwidth of the filter can be controlled by adjusting the structural parameters of the filter. In addition, the first higher-order mode TE102 of the SIW cavity is suppressed by minimizing the coupling of TE102 mode in order to obtain wide-stopband performance. The proposed filter is designed, fabricated, and measured, and the simulation and measurement results show a good agreement. The filter exhibits compact size, low loss, and a rejection higher than 20 dB up to 1.94f0.
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Górski, Paweł, and Leszek Morzyński. "Active Noise Reduction Algorithm Based on NOTCH Filter and Genetic Algorithm." Archives of Acoustics 38, no. 2 (June 1, 2013): 185–90. http://dx.doi.org/10.2478/aoa-2013-0021.

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Abstract Application of active noise reduction (ANR) systems in hearing protectors requires the use of control algorithms to ensure stability of the ANR system and at the same time highly effective active noise reduction. A control algorithm based on NOTCH filters is an example of solutions that meet these criteria. Their disadvantage is operation over a narrow frequency band and a need for prior determination of frequencies to be reduced. This paper presents a solution of the ANR system for hearing protectors which is controlled with the use of modified NOTCH filters with parameters determined by a genetic algorithm. Application of a genetic algorithm allows to change the NOTCH filter reference signal frequency, and thus, adapt the filter to the reduced signal frequency.
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Mitić, Darko, Goran Jovanović, Mile Stojčev, and Dragan Antić. "ON DESIGN OF SELF-TUNING ACTIVE FILTERS." Facta Universitatis, Series: Automatic Control and Robotics 19, no. 1 (July 28, 2020): 059. http://dx.doi.org/10.22190/fuacr2001059m.

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In this paper, we present one approach in design of self-tuning all-pass, band-pass, low-pass and notch filters based on phase control loops with voltage-controlled active components and analyze their stability as well. The main idea is to vary signal delay of the filter and in this way to achieve phase correction. The filter phase characteristics are tuned by varying the transconductance of the operational transconductance amplifier or capacitance of an MOS varicap element, which are the constituents of filters. This approach allows us to implement active filters with capacitance values of order of pF, making the complete filter circuit to be amenable for realization in CMOS technology. The phase control loops are characterized by good controllable delay over the full range of phase and frequency regulation, high stability, and short settling (locking) time. The proposed circuits are suitable for implementation as a basic building RF function block, used in phase and frequency regulation, frequency synthesis, clock generation recovery, filtering, selective amplifying etc.
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Dissertations / Theses on the topic "Controlled frequency filter"

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Minarčík, Martin. "Návrh koncepce napěťového konvejoru a jeho aplikační možnosti." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233471.

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This doctoral thesis deals with a voltage conveyor as a new active element for an analog signal processing. Various types of the voltage conveyors have been defined as a dual active elements to current conveyors based on a duality principle. Conception of a new active element that can supply all types of the voltage conveyors have been proposed. The active element has been named an universal voltage conveyor – UVC. A voltage follower is a basic building block of the UVC. The well-known circuit realization of the voltage follower comes from four transconductance amplifiers with key parameters (voltage transfer and output resistance) derived from relative accuracy of used transconductance amplifiers has been used by UVC fabrication. A new circuit realization of the voltage follower comes from three transconductance amplifiers with key parameters also derived from relative accuracy of used transconductance amplifiers has been designed. Further the doctoral thesis deals with a frequency filter with the voltage conveyors design using signal flow graphs. Various graphs of the voltage conveyors comes from the various circuit analysis methods with non-regular active elements have been created. A basic graph of the voltage conveyor has been designed with help of a known controlled sources graphs. This graph have been used to design of multifunctional frequency filters, filters with high input and low output impedance and controlled frequency filters. A design procedure have been created so that in specific step of the frequency filter design the basic graph of the voltage conveyor could be extended to graph of any type of the voltage conveyor. Thereby a practical usage of various types of the voltage conveyors has been finding out. Further a new method of frequency filter design based on expanding of the signal flow has beenproposed.
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Kopeček, Pavel. "Analýza, vlastnosti a aplikace komerčně dostupných napěťových násobiček." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219161.

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This work deals with the analog multipliers, mainly of the voltage multipliers. Also the modifications of current output will appear here. The first part is devoted to a choice several multipliers and a description of their functions, the possible involvement and introduction of the most important catalog values. The next section deals with the simple application that contains at least one of the multipliers. Next was the implementation of selected applications and measure their actual performance parameters. Results are then compared with computer simulations. As final step is done of tolerance and sensitivity analysis of simulated configurations of circuits.
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Popelka, Petr. "Syntetické obvodové prvky s imitancí vyššího řádu s řízenými proudovými zdroji." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218108.

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This thesis deals with design and use synthetic circuit elements with higher-order immittance with controlled current sources to implement the frequency filters. Controlled current sources which are derived from the voltage variations are presented. They are current follower, current invertor and current operational amplifier. Low-pass and high-pass filter which are used synthetic elements are simulated on computer. The influence of real properities of active elements and passive elements tolerances on filter functionality is investigated. Selected circuit of frequency filter is realized and measured the frequency characteristic.
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Stejný, Jiří. "Návrh řiditelných kmitočtových filtrů s moderními proudovými prvky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218116.

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This master´s thesis deals an active elements called digitally controlled current amplifier, multiple-output current follower and its usage in tunable frequency filters. These tunable frequency filters operate in a pure current mode. In the first part of this work are presented the different types of current active elements. Universal current conveyor, multiple-output current follower, digitally controlled current amplifier (UCC, MO-CF, DCCA). In the second part of this work are introduced particular methods of design tunable frequency filters. Special attention is given to using the design method of via autonomous circuits because it is one of the most. In the last part of this thesis are designed and computer-simulated individual multifunction tunable frequency filters with those already active yet elements. These filters were designed via autonomous circuits or modification of existing circuits. The functionality of the proposed filtres have been verified by computer simulation. Snap3 program was used for the symbolic analyse of circuit and OrCad PSpice program was used to simulate the characteristics of multifunction filters.
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Nair, Dileep 1976. "An accuracy controlled combined adaption-optimization scheme for improving the performance of 3D microwave devices over a frequency band /." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115714.

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The design of 3D microwave devices can be improved by using computational optimization techniques combined with numerical simulations of the electromagnetic field. However, high accuracy field analysis is often computationally expensive and time consuming. One way to cut costs is to vary the accuracy level of the analysis at different stages of the optimization. This idea is based on the premise that the accuracy need not be constant throughout the optimization, and so the numerical analysis can be run more cheaply without compromising design quality.
This thesis presents a software system that minimizes the return loss of 3D microwave devices over a frequency band efficiently through accuracy control. It combines a custom gradient-based optimizer with a p-adaptive frequency-domain finite element solver. The solver computes the cost function and its gradient to a specified accuracy in a cost efficient manner. The p-adaptive solver comprises of two original components: an a-posteriori error estimator to evaluate the error in the cost function gradient, and an error indicator to identify the high error regions in the mesh. The optimizer controls the accuracy of the cost function evaluation through a link with the solver, specifying the required relative error for the gradient at each optimization step.
The combined adaption-optimization scheme was applied to 3D rectangular waveguide problems for validation: an E-plane miter bend, a U-bend, an impedance transformer and a compensated magic-T. For comparison, all the problems were also optimized using high-order finite elements at every step. Test results prove the computational efficiency of the new combined scheme at various stages of the optimization. In the early stages, when the element orders are low, the scheme is able to attain similar cost function reductions as the high-order analysis, with computational savings up to a factor of 25. Even in the late stages, when the accuracy is more stringent, the scheme manages a reduction in cumulative computation time of at least a factor of 4.
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Janczak, Teresa Krystyna. "Estimation of Jitter Effects in Oscillators and Frequency Synthesizers Due to Prototypical Perturbation Sources." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1094%5F1%5Fm.pdf&type=application/pdf.

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Alcaina, Acosta José Joaquín. "Design and implementation of event-based multi-rate controllers for networked control systems." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/159884.

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[ES] Con esta tesis se pretende dar solución a algunos de los problemas más habituales que aparecen en los Sistemas de control basados en red (NCS) como son los retardos variables en el tiempo, las pérdidas y el desorden de paquetes, y la restricción de ancho de banda y de recursos computacionales y energéticos de los dispositivos que forman parte del sistema de control. Para ello se ha planteado la integración de técnicas de control multifrecuencial, de control basado en paquetes, de control basado en predictor y de control basado en eventos. Los diseños de control realizados se han simulado utilizando Matlab-Simulink y Truetime, se ha analizado su estabilidad mediante LMIs y QFT, y se han validado experimentalmente en un péndulo invertido, un robot cartesiano 3D y en robots móviles de bajo coste. El artículo 1 aborda el control basado en eventos, el cual minimiza el ancho de banda consumido en el NCS mediante un control basado en eventos periódicos y presenta un método para obtener sus parámetros óptimos para el sistema específico en que se utilice. Los artículos 2, 4 y 6 añaden el control basado en paquetes, así como el control multifrecuencia, que aborda problemas de falta de datos por bajo uso del sensor y los retardos, pérdidas y desórdenes de paquetes en la red. También afrontan, mediante tecnicas de predicción basadas en un filtro de Kalman multifrecuencia variable en el tiempo, los problemas de ruido y perturbaciones, así como la observación de los estados completos del sistema. El artículo 7 hace frente a un modelo no lineal que utiliza las anteriores soluciones junto con un filtro de Kalman extendido para presentar otro tipo de estructura para un vehículo autónomo que, gracias a la información futura obtenida mediante estas técnicas, puede realizar de forma remota tareas de alto nivel como es la toma de decisiones y la monitorización de variables. Los artículos 3 y 5, presentan una forma de obtener y analizar la respuesta en frecuencia de sistemas SISO multifrecuencia y estudian su comportamiento ante ciertas incertidumbres o problemas en la red haciendo uso de procedimientos QFT.
[CA] Amb aquesta tesi es pretén donar solució a alguns dels problemes més habituals que apareixen als Sistemes de Control Basats en xarxa (NCS) com son els retards d'accés i transferència variables en el temps, les pèrdues y desordenament de paquets, i la restricció d'ampli de banda així com de recursos computacionals i energètics dels dispositius que foment part del sistema de control. Per tal de resoldre'ls s'ha plantejat la integració de tècniques de control multifreqüencial, de control basat en paquets, de control basat en predictor i de control basat en events. Els dissenys de control realitzats s'han simulat fent ús de Matlab-Simulink i de TrueTime, s'ha analitzat la seua estabilitat mitjançant LMIs i QFT, i s'han validat experimentalment en un pèndul invertit, un robot cartesià 3D i en robots mòbils de baix cost. L'article 1 aborda el control basat en events, el qual minimitza l'ampli de banda consumit a l'NCS mitjançant un control basat en events periòdics i presenta un mètode per a obtindré els seus paràmetres òptims per al sistema específic en el qual s'utilitza. Els articles 2, 4 i 6 afegeixen el control basat en paquets, així com el control multifreqüència, que aborda problemes de falta de dades per el baix us del sensor i els retards, pèrdues i desordre de paquets en la xarxa. També afronten, mitjançant tècniques de predicció basades en un filtre de Kalman multifreqüència variable en el temps. Els problemes de soroll i pertorbacions, així com la observació dels estats complets del sistema. L'article 7 fa referència a un model no lineal que utilitza les anteriors solucions junt a un filtre de Kalman estès per a presentar altre tipus d'estructura per a un vehicle autònom que, gracies a la informació futura obtinguda mitjançant aquestes tècniques, pot realitzar de manera remota tasques d'alt nivell com son la presa de decisions i la monitorització de variables. Els articles 3 y 5 presenten la manera d'obtindre i analitzar la resposta en frequencia de sistemes SISO multifreqüència i estudien el seu comportament front a certes incerteses o problemes en la xarxa fent us de procediments QFT.
[EN] This thesis attempts to solve some of the most frequent issues that appear in Networked Control Systems (NCS), such as time-varying delays, packet losses and packet disorders and the bandwidth limitation. Other frequent problems are scarce computational and energy resources of the local system devices. Thus, it is proposed to integrate multirate control, packet-based control, predictor-based control and event-based control techniques. The control designs have been simulated using Matlab-Simulink and Truetime, the stability has been analysed by LMIs and QFT, and the experimental validation has been done on an inverted pendulum, a 3D cartesian robot and in low-cost mobile robots. Paper 1 addresses event-based control, which minimizes the bandwidth consumed in NCS through a periodic event-triggered control and presents a method to obtain the optimal parameters for the specific system used. Papers 2, 4 and 6 include packet-based control and multirate control, addressing problems such as network delays, packet dropouts and packet disorders, and the scarce data due to low sensor usage in order to save battery in sensing tasks and transmissions of the sensed data. Also addressed, is how despite the existence of measurement noise and disturbances, time-varying dual-rate Kalman filter based prediction techniques observe the complete state of the system. Paper 7 tackles a non-linear model that uses all the previous solutions together with an extended Kalman filter to present another type of structure for an autonomous vehicle that, due to future information obtained through these techniques, can remotely carry out high level tasks, such as decision making and monitoring of variables. Papers 3 and 5, present a method for obtaining and analyzing the SISO dual-rate frequency response and using QFT procedures to study its behavior when faced with specific uncertainties or network problems.
This work was supported by the Spanish Ministerio de Economía y Competitividad under Grant referenced TEC2012-31506.
Alcaina Acosta, JJ. (2020). Design and implementation of event-based multi-rate controllers for networked control systems [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/159884
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Maalouf, Haddad Amira. "Sensorless control of brushless synchronous starter generator including sandstill and low speed region for aircraft application." Thesis, Cachan, Ecole normale supérieure, 2011. http://www.theses.fr/2011DENS0008.

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In More Electric Aircraft, different power system activities are attributed to electrical means such as the start-up of the main engine. In this context, the study of the sensorless control of the Brushless Synchronous Starter Generator (BSSG) that is used to electrically start the main engine is revealed to be a very interesting issue. For long time, the elimination of the mechanical sensor was highly recommended for reliability, cost, weight, integration issues.Hence, this work aims to transpose the results obtained in the research area to an avionic testbench. It presents an adaptive sensorless technique to use when electrically starting the main engine of the aircraft. This is achieved by elaborating three different methods selected depending on the speed of the machine and based on the :- injection of a high frequency signal- use of the back-emf of the Permanent Magnet Generator (PMG)- use of the extended Kalman Filter EKFIn this work, it is shown that the …first method gives good position estimation results from standstill up to 8% of the rated speed. Then, the back-emfs of the PMG are used to detect the position of the BSSG when the speed exceeds the 8% of the rated speed. Good results are observed with this method at medium and high speed.For redundancy reasons, the EKF was also used in this work. Thus, the estimated position can be delivered via two different estimation algorithms in medium and high speed region.The implementation of the algorithm was achieved on an FPGA board since the latter can ensure a very tiny execution time. The fastness of the treatment ensures quasi-instantaneous position estimation and does not practically introduce any phase lag in the position estimation
Aujourd'hui, l'aviation est en train de vivre des évolutions technologiques concernant surtout l'attribution de différentes fonctionnalités aux équipements électriques et ceci au détriment d'équipements hydrauliques et mécaniques assurant les mêmes fonctionnalités.Dans le cadre de l'avion plus électrique, le démarrage électrique sans capteurs mécaniques de la turbine de l'avion préoccupe les avionneurs de nos jours. Les problèmes introduits par ce capteur ont été identifiés : problèmes de coût et de poids, problèmes de fiabilité et d'intégration.Ce travail présente alors une commande sans capteurs pour la machine synchrone à trois étages à utiliser durant le démarrage électrique de l'avion. Ceci est réalisé avec trois méthodes de détection de la position selon la vitesse de rotation, basées sur :- l'injection d'un signal à haute fréquence- l'utilisation d'un filtre de Kalman étendu FKE- les fém. du PMG (Permanent Magnet Generator) La première méthode donne de bons résultats d'estimation depuis l'arrêt jusqu'à 8% de la vitesse nominale de la machine. Au-delà de cette vitesse, es valeurs des fém. du PMG deviennent assez élevées pour être utilisées dans l'estimation de la position. De bons résultats sont obtenus à moyenne et haute vitesse.Pour des questions de redondance, le FKE est aussi utilisé. Ainsi, la position estimée peut être fournie par l'un des deux algorithmes à moyenne et haute vitesse.L'implémentation de ces algorithmes est réalisée via une carte FPGA étant donné que celui-ci garantit un temps d'exécution. La rapidité de traitement garantit une estimation de la position quasi-instantanée et donc n'introduit pratiquement pas des retards dans l'estimation
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Book chapters on the topic "Controlled frequency filter"

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Hugar, Shobha I., Vaishali Mungurwadi, and J. S. Baligar. "Dual-Mode Wide Band Microstrip Bandpass Filter with Tunable Bandwidth and Controlled Center Frequency for C-Band Applications." In Emerging Research in Computing, Information, Communication and Applications, 533–40. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6001-5_44.

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Van Tung, Le, Pham Thanh Long, Ngo Van An, and Bogdan Vasilev. "Compare the Efficiency of the Active Filter and Active Rectifier to Reduce Harmonics and Compensate the Reactive Power in Frequency Controlled Electric Drive Systems." In Advances in Engineering Research and Application, 242–53. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64719-3_28.

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Aparanta, Ananya, Rabindra Kumar Sahu, and Pratap Chandra Pradhan. "DE Optimized 2-DOF Tilt Integral Derivative Controller with Filter for Frequency Regulation of Interconnected Power System." In Learning and Analytics in Intelligent Systems, 130–39. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30271-9_13.

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"The voltage-controlled low-pass filter based on FPGA frequency measurement." In Mechatronics Engineering and Electrical Engineering, 67–72. CRC Press, 2015. http://dx.doi.org/10.1201/b18421-15.

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Kumar, Niraj, and Vishnu Mohan Mishra. "Comparative Critical Analysis of Artificial Intelligent Technique and Conventional Control Technique Applied in Series Filter for Harmonic Reduction." In Applications of Artificial Intelligence in Electrical Engineering, 129–43. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2718-4.ch008.

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Series active filters, besides the dc voltage regulators, incorporate controller such as voltage controller and hysteresis band controllers, etc.. The conventional PI controller suffers from the significant drawback of having a high content of ripples and the low speed due to variable switching frequency caused by the usage of hysteresis controllers. In order to overcome this shortcoming, two different control strategies (i.e., sinusoidal fryze voltage control and adaptive tabu search-sinusoidal fryze voltage control strategy) have been developed in this research work. The performance of SAFs has been analyzed by using these current control strategies. The proposed ATS-SFV control strategy based voltage controller yielded better performance as compared to those obtainable from the SFV control strategy. The comparisons of the proposed strategies among themselves facilitate a need-based selection of them for the supply system. To realize these control strategies, MATLAB/Simulink-based models have been developed for simulation.
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Conference papers on the topic "Controlled frequency filter"

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Pendharker, Sarang, R. K. Shevgaonkar, and A. N. Chandorkar. "Optically controlled frequency switching band stop filter." In 2012 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2012. http://dx.doi.org/10.1109/apcap.2012.6333201.

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Rami, Rami, Mustapha Alami, Farid Temcamani, Yahya Lakys, Bruno Delacressonniere, and Moulhime El Bekkali. "Low power agile active filter with digitally controlled center-frequency." In 2014 International Conference on Multimedia Computing and Systems (ICMCS). IEEE, 2014. http://dx.doi.org/10.1109/icmcs.2014.6911353.

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Avramov, I. D., S. R. Gilbert, and R. Ruby. "1.5 GHz voltage controlled oscillator with 3% tuning bandwidth using a two-pole DSBAR filter." In 2010 IEEE International Frequency Control Symposium (FCS). IEEE, 2010. http://dx.doi.org/10.1109/freq.2010.5556256.

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Zhang, Zilong, and C. Steve Suh. "A Novel Nonlinear Time-Frequency Strategy for Stabilizing Inverted Pendulum Cart System." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86758.

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The stabilization of the inverted pendulum-cart system (IPCS) is a classical problem in the control engineering. The study of IPCS is motivated by its applications to the balancing of rocket boosters and bipedal robots. IPCS represents a class of nonlinear, under-actuated, and unstable system hard to be controlled in real-time. In this paper, a novel nonlinear time-frequency control (NTFC) strategy is applied to stabilize an inverted pendulum mounted on a cart. The proposed controller design is adaptive and employs discrete the wavelet transform and filtered-x least-mean-square (Fx-LMS) algorithm to realize the control in real-time. Using the wavelet transform, the adaptive controller is demonstrated to inhibit the deteriorations of the time and frequency responses simultaneously before the residual oscillation is too broadband to be controlled. The presented controller consists of two adaptive finite impulse response filers that operate on the wavelet coefficients: the first one realizes the online identification and provides a priori information in real-time while the second one realizes a feedforward control and rejects the uncontrollable input signal based on the first FIR filter. The equation of motion is derived based on the Newton’s Second law of motion and the model id simulated in MATLAB for verification. A number of commonly used control methods for the stabilization of the IPCS are investigated and evaluated against the proposed NTFC strategy. The simulation results show that the proposed control strategy is feasible for balancing the IPCS for a large, tilted initial angle within a short time interval and strongly robust to external impact and perturbation in real-time.
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Shibasaki, So, Masato Toge, and Shinichi Iwamoto. "Load frequency control using a NAS battery system controlled by a Kaiman filter." In 2012 10th International Power & Energy Conference (IPEC). IEEE, 2012. http://dx.doi.org/10.1109/asscc.2012.6523270.

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Saidi, Salem, Rabeh Abbassi, and Souad Chebbi. "Adaptive-fuzzy hysteresis controlled three phase shunt active filter for constant switching frequency." In 2016 5th International Conference on Modern Circuits and Systems Technologies (MOCAST). IEEE, 2016. http://dx.doi.org/10.1109/mocast.2016.7495168.

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Glasberger, Tomas, Martin Janda, Vendula Muzikova, Jan Majorszky, and Zdenek Peroutka. "Frequency analysis and stability enhancement of DTC controlled PMSM drive with input LC filter." In 2012 Electrical Systems for Aircraft, Railway and Ship Propulsion (ESARS). IEEE, 2012. http://dx.doi.org/10.1109/esars.2012.6387413.

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Kuo, Chi-Wei, and C. Steve Suh. "The Optimization of Time-Frequency Control: Using Non-Autonomous Time-Delay Feedback Systems as Example." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67170.

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A novel time-frequency nonlinear scheme demonstrated to be feasible for the control of dynamic instability including bifurcation, non-autonomous time-delay feedback oscillators, and route-to-chaos in many nonlinear systems is applied to the control of a time-delayed system. The control scheme features wavelet adaptive filters for simultaneous time-frequency resolution. Specifically Discrete Wavelet transform (DWT) is used to address the nonstationary nature of a chaotic system. The concept of active noise control is also adopted. The scheme applied the filter-x least mean square (FXLMS) algorithm which promotes convergence speed and increases performance. In the time-frequency control scheme, the FXLMS algorithm is modified by adding an adaptive filter to identify the system in real-time in order to construct a wavelet-based time-frequency controller capable of parallel on-line modeling. The scheme of such a construct, which possesses joint time-frequency resolution and embodies on-line FXLMS, is able to control non-autonomous, nonstationary system responses. Although the controller design is shown to successfully moderate the dynamic instability of the time-delay feedback oscillator and unconditionally warrant a limit cycle, parameters are required to be optimized. In this paper, the setting of the control parameters such as control time step, sampling rate, wavelet filter vector, and step size are studied and optimized to control a time-delay feedback oscillators of a nonautonomous type. The time-delayed oscillators have been applied in a broad set of fields including sensor design, manufacturing, and machine dynamics, but they can be easily perturbed to exhibit complex dynamical responses even with a small perturbation from the time-delay feedback. These responses for the system have a very negative impact on the stability, and thus output quality. Through employingfrequency-time control technique, the time responses of the time-delay feedback system to external disturbances are properly mitigated and the frequency responses are also suppressed, thus rendering the controlled responses quasi-periodic.
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Rosenberg, Uwe, Ralf Beyer, Peter Krauss, Thomas Sieverding, Andreas Papanastasiou, Marcos Pueyo-Tolosa, Petronilo Martin Iglesias, and Christoph Ernst. "Novel remote controlled dual mode filter providing flexible re-allocation of center frequency and bandwidth." In 2016 IEEE/MTT-S International Microwave Symposium (IMS). IEEE, 2016. http://dx.doi.org/10.1109/mwsym.2016.7539953.

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Barbosa Moreira, Alysson Bruno, and Fabrice Thouverez. "Influence of Blade Flexibility on the Dynamic Response Simulation of a Turbomolecular Pump on Magnetic Bearings." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90990.

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Abstract This paper proposes the simulation of a complete mechanical model of a turbomolecular pump rotor, including rotor and blades flexibility, suspended by controlled active magnetic bearings. The mechanical model is composed of an eight stage blisk, attached to a shaft. Magnetic forces are linearized by first order Taylor expansion around a given point. Including blades and rotor flexibility makes the mechanical system asymmetric, so the equations of motion for the coupled system have periodic terms. A modal controller was designed to control rigid body modes, since the number of sensors is limited and no state observer is implemented. PID controllers are used for low frequency modes combined with second order filters to damp high frequency modes. First of all, stability analysis was carried out for the axisymmetric case. Secondly, blades flexibility was included. Forced response of the whole system to an impulsive force was studied. Divergent responses for the system in rotation were obtained as a second order filter pole possibly interacts with blades modes. Taking second order filters off the control loop allowed the system to be stable. These results show that the analysis method developed here is efficient to evaluate the performance of a controller in closed loop with the complete flexible system. This method may be used in industrial design processes as computation times for the complete system are very short.
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