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Tytuł:
The algorithm of adaptive determination of amplification of the PD filter estimating object state on the basis of signal measurable on-line
Autorzy:
Kwater, Tadeusz
Hawro, Przemysław
Bartman, Jacek
Mazur, Damian
Powiązania:
https://bibliotekanauki.pl/articles/1409165.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
estimation
Kalman filter
adaptive PD filter
filter amplification
Opis:
The article presents the algorithm that enables adaptive determination of the amplification coefficient in the filter equation provided by Kalman. The method makes use of an estimation error, which was defined for this purpose, and its derivative to determine the direction of correction changes of the gain vector. This eliminates the necessity to solve Riccati equation, which causes reduction of the method computational complexity. The experimental studies carried out using the proposed approach relate to the estimation of state coordinates describing river pollution using the BOD (biochemical oxygen demand) and DO (dissolved oxygen) indicators).The acquired results indicate that the suggested method does better estimations than the Kalman filter. Two indicators were used to measure the quality of estimates: the Root Mean Squared Error (RMSE) and the Mean Percentage Error (MPE).
Źródło:
Archives of Control Sciences; 2021, 31, 1; 129-143
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital filter tuned according to spectral analysis of direct drive to reduce mechanical resonance effect
Autorzy:
Łuczak, D.
Powiązania:
https://bibliotekanauki.pl/articles/97189.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
digital filter
mechanical resonance
filter
Opis:
Review of the filter structures and spectral analysis algorithms was done. Digital filters allow filtering the speed signal in control loop of direct drive with a mechanical resonance. The analogue filter equations were transformed into digital filters to enable tune them in real time. Spectral analysis with additional algorithm allows to determine the mechanical resonance frequency of multi-mass system. Determination of resonance frequencies allow for proper tune the digital filter. This paper presents selected algorithms of determine signal spectrum. In order to determine the mechanical resonance frequency from the whole spectrum, it is require to use an additional algorithm that was omitted from the consideration. Filters were tuned according to frequency characteristics of the object.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 194-204
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the performance comparison of three optimal Alpha-Beta-Gamma filters and Alpha-Beta-Gamma-Eta filter for a high dynamic target
Autorzy:
Jeong, T.
Njonjo, A.W.
Pan, B.F.
Powiązania:
https://bibliotekanauki.pl/articles/116598.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
integrated navigation
Alpha-Beta-Gamma filter
Benedict-Bordner filter
Simpson filter
Gray-Murray filter
target dynamics
Alpha-Beta-Gamma-Eta filter
Kalman filter
Opis:
The Alpha-Beta-Gamma tracking filter is useful for tracking a constant acceleration target with zero lag error in the steady state. It, however, depicts a constant lag error for a maneuvering target. Various algorithms of the Alpha-Beta-Gamma tracking filter exist in literature and each one of them presents its own unique challenges and advantages depending on the design requirement. This study investigates the operation of three Alpha-Beta-Gamma tracking filter design methods which include Benedict-Bordner also known as the Simpson filter, Gray-Murray filter and the fading memory constant acceleration filter. These filters are then compared based on the ability to reduce noise and follow a maneuvering target with minimum lag error, against the jerky model Alpha-Beta-Gamma-Eta. Results obtained from simulations of the input model of the target dynamics under consideration indicate an improvement in performance of the jerky model in comparison with the constant acceleration models.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 55-61
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of high dust capacity, high efficiency engine air filter with nanofibres
Autorzy:
Jaroszczyk, T.
Fallon, S. L.
Schwartz, S. W.
Powiązania:
https://bibliotekanauki.pl/articles/247590.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engine air filter
multi-media filter design
nanofiber filter media
air filter performance
filter efficiency
dust holding capacity
reentrainment
testing
Opis:
Although dust-holding capacity is the primary feature of engine air filters operating in dusty environments, efficiency becomes a major factor when selecting an engine air filter. Inertial separators and high porosity or fibrous prefilters are commonly used to decrease the dust load to the main filter while high efficiency is achieved by utilizing submicron or nanofiber fibers in the main filter. The patented multi-stage filter was designed to achieve ultra-high particle removal efficiency and dust holding capacity, and long life in dusty and on highway environments. The main (final) filter is located downstream of the prefilter. The main filter is made ofpleatedfilter media containing nanofibers with a diameter in the range of40 - 800 nanometers. The upstream in-line precleaner utilizing flow-through mini cyclones has separation efficiency of 95%. A high dust capacity, high efficiency prefilter can be used instead of the precleaner. The prefilter is made of vertically lapped nonwoven filter media made from synthetic fibers of different materials to fully utilize the tribological effect. The volume of the prefilter is determined by the performance required and space allotted. This paper discusses the filter performance of high dust holding capacity engine air filters. Filter specifications, design and performance are discussed in detail. Performance characteristics of the media and full size filters were determined using on-line particle counters and the gravimetric test method. Initial and final efficiency, and dust loading performance characteristics, are provided.
Źródło:
Journal of KONES; 2008, 15, 3; 215-224
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of estimation accuracy of EKF, UKF and PF filters
Autorzy:
Konatowski, S.
Kaniewski, P.
Matuszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/320725.pdf
Data publikacji:
2016
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
non-linear filtering
extended Kalman filter
unscented Kalman filter
particle filter
Opis:
Several types of nonlinear filters (EKF — extended Kalman filter, UKF — unscented Kalman filter, PF — particle filter) are widely used for location estimation and their algorithms are described in this paper. In the article filtering accuracy for non-linear form of measurement equation is presented. The results of complex simulations that com-pare the quality of estimation of analyzed non-linear filters for complex non-linearities of state vector are presented. The moves of maneuvering object are described in two-dimensional Cartesian coordinates and the measurements are described in the polar coordinate system. The object dynamics is characterized by acceleration described by the univariate non-stationary growth model (UNGM) function. The filtering accuracy was evaluated not only by the root-mean-square errors (RMSE) but also by statistical testing of innovations through the expected value test, the whiteness test and the WSSR (weighted sum squared residual) test as well. The comparison of filtering quality was done in the MATLAB environment. The presented results provide a basis for designing more accurate algorithms for object location estimation.
W artykule opisane zostały algorytmy filtrów nieliniowych (rozszerzony EKF i bezśladowy UKF filtr Kalmana oraz filtr cząstkowy PF) stosowane powszechnie do estymacji położenia. Porównano dokładność estymacji tych filtrów dla nieliniowego równania pomiarowego. Zaprezentowane zostały rezultaty badań symulacyjnych porównujących jakość estymacji analizowanych rodzajów filtrów nieliniowych dla złożonej nieliniowości wektora stanu. Ruch obiektu manewrującego opisano w dwuwymiarowym układzie kartezjańskim, natomiast pomiary w polarnym układzie współrzędnych. Dynamikę obiektu charakteryzuje przyspieszenie opisane funkcją Univariate-Non-Stationary-Growth-Model. Efektywność badań, poza określaniem błędów średniokwadratowych RMSE, oceniano poprzez statystyczne testowanie innowacji za pomocą: testu wartości oczekiwanej, testu białości oraz testu WSSR (Weighted-Sum-Squared-Residual). Ocena jakości procesu filtracji została przeprowadzona w środowisku MATLAB. Przedstawione wyniki stanowią podstawę do projektowania dokładniejszych algorytmów estymacji położenia obiektu.
Źródło:
Annual of Navigation; 2016, 23; 69-87
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of UFMC Fading Channels Using H∞ Filter
Autorzy:
Jamoos, Ali
Powiązania:
https://bibliotekanauki.pl/articles/308699.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
5G
autoregressive model
channel estimation
fading channel
H ∞ filter
Kalman filter
LMS filter
RLS filter
UFMC
Opis:
Universal filtered multi-carrier (UFMC) modulation is a very powerful candidate to be employed for future 5G mobile systems. It overcomes the limitations and restrictions in current modulation techniques employed in 4G mobile systems and supports future applications, such as machineto-machine (M2M), device-to-device (D2D), and vehicle-tovehicle (V2V) communications. In this paper, we address the estimation of UFMC fading channels based on the comb-type pilot arrangement in the frequency domain. The basic solution is to estimate the fading channel based on the mean square error (MSE) or least square (LS) criteria with adaptive implementation using least mean square (LMS) or recursive least square (RLS) algorithms. However, these adaptive filters seem not to be effective, as they cannot fully exploit fading channel statistics, particularly at high Doppler rates. To take advantage of these statistics, time-variations of the fading channel are modeled by an autoregressive process (AR), and are tracked by an H∞ filter. This, however, requires that AR model parameters be known, which are estimated by solving the Yule-Walker equation (YWE), based on the Bessel autocorrelation function (ACF) of the fading channel with a known Doppler rate. Results of Matlab simulations show that the proposed H∞ filter-based channel estimator is more effective when compared with existing estimators.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 2; 28-35
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The dynamics of the human arm with an observer for the capture of body motion parameters
Autorzy:
Babiarz, A.
Bieda, R.
Jaskot, K.
Klamka, J.
Powiązania:
https://bibliotekanauki.pl/articles/201899.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
human arm
observability
Kalman filter
particle filter
Opis:
The paper presents an analysis of a mathematical model of the human arm dynamics in terms of observability. The purpose of the performed experiments is the selection of an observer for the possibility of arm tracking. The arm model is based on the two-link manipulator moving horizontally and vertically. For the study a model was linearized and the model part responsible for the work of human muscles was omitted. The experimental part involved simulated measurements of the motion parameters that imitate real-IMU (Inertial Measurement Unit) measurements. Finally, the simulation results using the observer in the form of a Kalman filter and the particle filter have been presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 955-971
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of dynamic properties of parametric and fractional-order filters
Autorzy:
Jakubowska-Ciszek, Agnieszka
Piwowar, Anna
Powiązania:
https://bibliotekanauki.pl/articles/377115.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
parametric filter
fractional-order filter
filter dynamic models
LTV filters
dynamic properties
Opis:
The paper presents transmission models of a parametric filter with non-periodically variable parameters and a fractional-order filter. The responses of these filters on a unit step excitation have been examined as well as the dependence of filters time responses on their parameters. The obtained results have been illustrated by examples.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 97; 133-142
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projekty aktywnych filtrów analogowych
Projects of analog active filters
Autorzy:
Kagankiewicz, F.
Powiązania:
https://bibliotekanauki.pl/articles/1366448.pdf
Data publikacji:
2018
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
filtry
filtry analogowe
filtry aktywne
filtry dolnoprzepustowe
filtry górnoprzepustowe
filters
analog filter
active filter
lowpass filter
highpass filter
Opis:
Punktem wyjścia do artykułu był fakt, że nie w każdej aplikacji jest możliwe wykorzystanie filtrów cyfrowych, w związku z czym podjęto się wykonania projektów aktywnych filtrów analogowych. W pracy opisano metody projektowania aktywnych filtrów analogowych. Przedstawiono trzy główne metody projektowania takie jak Sallen-Key, Multiple Feedback oraz Linkwitz-Riley. W drugiej części pracy zostały przedstawione dwa projekty filtrów: dolnoprzepustowego oraz górnoprzepustowego, o częstotliwości granicznej 1 kHz, które miały za zadanie charakteryzować się wysokim tłumieniem w paśmie zaporowym.
The starting point for the article was the fact that it is not possible to use digital filters in every application, therefore active analogue filter designs have been made. The paper describes methods of designing active analog filters, three main design methods are presented, such as Sallen-Key, Multiple Feedback and Linkwitz-Riley. The second part of the work presents two designs of lowpass and highpass filters, which have 1 kHz limit frequency. The objective was that filters should have a high attenuation in the stop band.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2018, 23, 3; 122-127
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of robust filtering of stratified surface topography
Autorzy:
Dobrzański, P.
Pawlus, P.
Powiązania:
https://bibliotekanauki.pl/articles/220827.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-process surfaces
digital filtering
robust filter
valley suppression filter
modification of filter
Opis:
Various components of surface texture are identified, namely form, waviness and roughness. Separation of these components is done by digital filtering. Several problems exist during analysis of two-process surfaces. Therefore the Gaussian robust profile filtering technique was established and has been studied here. The computer generated 2D profiles and 3D surface topographies having triangular scratches as well as measured stratified surfaces were subjected to filtration. However even robust filter applications cause distortion of profiles having valleys wider than 100 ěm. In order to minimize the distortion associated with wide and deep valleys, the robust filter should be modified. A special procedure was elaborated for minimizing distortion of roughness profiles caused by filtration. Application of this method to analyses of several profiles was presented. The difference between 1-D and 2-D filtering of surface topography using the same kind of filter was discussed. As a result we found that modification of a 2-D surface topography filter was not necessary.
Źródło:
Metrology and Measurement Systems; 2013, 20, 1; 107-118
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of Limestone as a Multi-Media Filter for Manganese Removal from Groundwater
Autorzy:
Ahmedi, Figene
Thaqi, Premton
Tosuni, Kaltrina
Powiązania:
https://bibliotekanauki.pl/articles/24202897.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
limestone
manganese
multi-media filter
single-media filter
Opis:
According to Council Directive 98/83/EC on the quality of water intended for human consumption, concentration of the manganese in the drinking water should not exceed 0.05 mg/l. However, this level of manganese concentration is higher ingroundwaterof a community (Vitia town) in Kosovo. Groundwater is used for drinking supply of some villages and is only chlorified continuing to the reservoir from where is gravitationallydisseminated to the villages. The manganese level of the water is at the range 0.3 to 0.6 mg/l. Limestone has been provenby many researchers to be a very effective filter material in manganese removal for groundwater.A miniature filtration unit was modeled to investigate the removal efficiency of manganese.The unit consists of local limestone, where a single materialis folded in three layers of different grainsizes. In fact, the aim of this paper was to assess whether limestone as a single material acting as a "multi-media filter" can reduce the manganese concentration in groundwater. On the basis of the analysis of the single snapshot sample,the removal of manganese achieved more than 95% in filtered water. Particularly, this study demonstrates that filtering the water through three layers of different grain sizes of limestone ("multi-media limestone filter") can be a good alternative for manganese removal in groundwater.
Źródło:
Journal of Ecological Engineering; 2023, 24, 6; 385--391
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soju Filters in Hoop Algebras
Autorzy:
Borzooei, Rajab Ali
Rezaei, Gholam Reza
Kologhani, Mona Aaly
Jun, Young Bae
Powiązania:
https://bibliotekanauki.pl/articles/1023327.pdf
Data publikacji:
2020-12-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Soju sub-hoop
soju filter
implicative soju filter
Opis:
The notions of (implicative) soju filters in a hoop algebra are introduced, and related properties are investigated. Relations between a soju sub-hoop, a soju filter and an implicative soju filter are discussed. Conditions for a soju filter to be implicative are displayed, and characterizations of an implicative soju filters are considered. The extension property of an implicative soju filter is established.
Źródło:
Bulletin of the Section of Logic; 2021, 50, 1; 97-123
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Filters of lattices with respect to a congruence
Autorzy:
Sambasiva Rao, M.
El-Mohsen Badawy, Abd
Powiązania:
https://bibliotekanauki.pl/articles/729197.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
congruence
filter
closure operator
θ-filter
congruence lattice
Opis:
Some properties of filters on a lattice L are studied with respect to a congruence on L. The notion of a θ-filter of L is introduced and these filters are then characterized in terms of classes of θ. For distributive L, an isomorphism between the lattice of θ-filters of L and the lattice of filters of $L_{/θ}$ is obtained.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2014, 34, 2; 213-219
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a Dual-Band Rectangular Waveguide Filter based on Direct Coupled
Autorzy:
Slimane, Gouni
Mehdi, Damou
Mohammed, Chetioui
Abdelhakim, Boudkhil
Powiązania:
https://bibliotekanauki.pl/articles/2124748.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
simulation
waveguide filter
HFSS
bandpass filter
direct coupling
Opis:
This paper presents how to design and simulate a passband rectangular waveguide filters based on direct coupled resonators operating at 12 GHz. The modeled filters are characterized by a cross coupling that produces a single attenuation pole at finite frequency used to shape the bandpass response. Resonators provide bandpass filter designs with a pseudo-elliptic response using HFSS simulators. Transmission zeros are obtained through coupling between the fundamental mode and high mode. The filter structures are validated leading to obtain transmission zeros close to the passband. The simulated waveguide filters with a centre frequency exhibit an insertion loss of -0.4/0.3dB and a return loss of −20/23dB for a bandwidth ranging from 11.85GHz to 12.15GHz that shows good electromagnetic responses for the simulated filters.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 483--488
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power system stability with parallel active filter ensuring compensation of capacitive reactive power of a resonant LC circuit
Autorzy:
Płatek, T.
Powiązania:
https://bibliotekanauki.pl/articles/201301.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
parallel active filter
passive filter
system stability analysis
Opis:
This paper presents an analysis allowing for the determination of the differential equation describing the circuit of the active filter inverter output current control with an additional measurement of input voltage. The resulting equation allows to determine the conditions that ensure stable operation of the filter with the load in form of a resonant LC circuit. Analysis results were confirmed by computer simulation and experimental studies of commercial active filter.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 353-361
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Auxiliary and Rao-Blackwellised particle filters comparison
Autorzy:
Kozierski, P.
Lis, M.
Powiązania:
https://bibliotekanauki.pl/articles/376777.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
particle filters
PF
SIR algorithm
Bootstrap Filter
Auxiliary Particle Filter
Rao-Blackwellised Particle Filter
Opis:
Particle filters are very popular - number of algorithms based on Sequential Monte Carlo methods is growing. Paper describes and compares the performance of two of them - Auxiliary and Rao-Blackwellised Particle Filters. Comparison includes also Bootstrap Filter and some variety of SIR algorithm.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 76; 79-88
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FIR Filter Design Using Distributed Maximal Flatness Method
Autorzy:
Blok, M.
Powiązania:
https://bibliotekanauki.pl/articles/227316.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital filter design
fractional delay filter
distributed maximal flatness
differentiator
Nyquist filter
variable fractional delay
Opis:
In the paper a novel method for filter design based on the distributed maximal flatness method is presented. The proposed approach is based on the method used to design the most common FIR fractional delay filter - the maximally flat filter. The MF filter demonstrates excellent performance but only in a relatively narrow frequency range around zero frequency but its magnitude response is no greater than one. This "passiveness" is the reason why despite of its narrow band of accurate approximation, the maximally flat filter is widely used in applications in which the adjustable delay is required in feedback loop. In the proposed method the maximal flatness conditions forced in standard approach at zero frequency are spread over the desired band of interest. In the result FIR filters are designed with width of the approximation band adjusted according to needs of the designer. Moreover a weighting function can be applied to the error function allowing for designs differing in error characteristics. Apart from the design of fractional delay filters the method is presented on the example of differentiator, raised cosine and square root raised cosine FIR filters. Additionally, the proposed method can be readily adapted for variable fractional delay filter design regardless of the filter type.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 1; 59-66
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of a selectable multi-passband microwave photonic filter based on cascaded optical comb filters
Autorzy:
Wang, F.
Peng, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2033940.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonic filter
multi-passband filter
microwave signal processing
Opis:
A multi-passband microwave photonic filter (MPF) with selectable passband frequency, spanning 0-20 GHz frequency range, is proposed, and experimentally demonstrated, in which passband frequency can be flexibly selected within a maximum passband number to four. The scheme is based on the generation of tunable optical comb lines using a broadband optical source sliced by cascaded optical comb filters, achieved by connecting an in-line birefringence fiber filter and a reconfigurable Lyot filter in series, such that various filter tap spacing and spectral combinations are obtained for the configuration of the MPF. The proposed MPF can operate with four different passband states, namely, single-, dual-, triple-, and quadruple-passband, only by adjusting polarization states of the cascaded optical comb filters. All these passbands are with a 3-dB bandwidth varying from 200 to 460 MHz and more than 20-dB sidelobe suppression.
Źródło:
Optica Applicata; 2021, 51, 3; 457-467
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Optimization of Rectangular Waveguide Filter based on Direct Coupled Resonators
Autorzy:
Damou, M.
Nouri, K.
Feham, M.
Chetioui, M.
Powiązania:
https://bibliotekanauki.pl/articles/963863.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coupling matrix
filter
waveguide
technology
electromagnetic
band-pass filter
Opis:
The waveguide filter structure is treated by two softwares (HFSS (High Frequency Structure Simulator) and CST (Computer Simulation Technology)). Numerical example is given in this article to demonstrate, step by step, the application of the approach to the design of resonator, direct coupled waveguide and microstrip filters based on electromagnetic (EM) simulations. For this design procedure, the filter structure is simulated by successively adding one resonator at a time. To continue the work illustrates how to design a fourth order coupled resonator based rectangular waveguide circuit in the traditional way. With a large number of variables, such tuning work consumes a lot of time and the convergence of the final result is not guaranteed. A fourth order X-band bandpass filter with a center frequency of 11 GHz and a fractional bandwidth FBW = 0,0273 is designed using this procedure and presented here as an example. The simulated results by CST are presented and compared withthe results simulated by a high-frequency structure simulator. Good agreement between the simulated HFSSand simulated results by CST is observed.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 4; 375-380
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of constant component filter in measurements of random telegraph signal noise
Realizacja układu filtru usuwającego składową stałą w pomiarach szumów wybuchowych
Autorzy:
Szewczyk, A.
Babicz, S.
Dudziak, A.
Powiązania:
https://bibliotekanauki.pl/articles/268664.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
filtr
składowa stała
RTS
RTS noise
DC filter
active filter
Opis:
Noise is generated in all semiconductor devices. The intensity of these fluctuations depends on used elements, manufacturing process, operating conditions and device type. The result noise is a superposition of different kinds of fluctuations like thermal noise, generation-recombination noise, 1/f noise, shot noise and Random Telegraph Signal (RTS) noise. The last one, RTS noise is observed as nonstationary impulse fluctuations. Unfortunately, it is hard to notice and investigate the RTS because of DC component value in contradiction to small amplitude of noise impulses. In the paper a simple filtrating system which removes the DC component without AC signal distortion is presented. Example oscilloscope measurement results and their analysis are also shown.
Szum jest generowany przez wszystkie urządzenia półprzewodnikowe. Szum wynikowy jest zwykle efektem superpozycji różnych rodzajów fluktuacji: szumu termicznego, szumu generacyjno-rekombinacyjnego, szumu 1/f i RTS. Ten ostatni, Random Telegraph Signal, jest obserwowany jako pojedyncze, niestacjonarne impulsy w badanym sygnale. Niestety, z powodu małej amplitudy oraz znacznej wartości składowej stałej, szum RTS jest bardzo trudny do obserwacji, co znacząco utrudnia jego badanie. W celu zwiększenia dokładności pomiaru, należy usunąć składową stałą z badanego sygnału. W artykule przedstawiono system odzyskujący składową stałą, a następnie odejmujący ją od sygnału wejściowego. W efekcie w sygnale wyjściowym otrzymuje się sygnał bez składowej stałej, w którym łatwiej jest zaobserwować i zbadać przebieg RTS.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2012, 31; 127-130
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compounding Objects
Autorzy:
Šikić, Zvonimir
Powiązania:
https://bibliotekanauki.pl/articles/749886.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Łoś's theorem
converse of Łoś's theorem
filter
proper filter
ultrafilter
Opis:
We prove a characterization theorem for filters, proper filters and ultrafilters which is a kind of converse of Łoś's theorem. It is more natural than the usual intuition of these terms as large sets of coordinates, which is actually unconvincing in the case of ultrafilters. As a bonus, we get a very simple proof of Łoś's theorem.
Źródło:
Bulletin of the Section of Logic; 2020, 49, 2
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anti Fuzzy filters of pseudo-BL-algebras
Autorzy:
Wojciechowska-Rysiawa, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/744877.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Pseudo-BL-algebra
Anti fuzzy filter
(anti fuzzy) prime filter
Opis:
Characterizations of anti fuzzy filters in a pseudo-BL-algebra are established. Conditions for a fuzzy set to be an anti fuzzy filter are given. Finally, a study anti of fuzzy prime filters and characterizations of linearly ordered pseudo-BL-algebras via anti fuzzy filters are given.
Źródło:
Commentationes Mathematicae; 2011, 51, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Attenuating and enhancing properties of the approximate deconvolution method based on higher-order explicit and compact filters
Autorzy:
Caban, L.
Tyliszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/38695731.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
explicit filter
compact filter
van Cittert deconvolution method
signal analysis
sub-filter scales reconstruction
Large Eddy Simulation
Opis:
We analyse the accuracy of a deconvolution (inverse filtering) method in 1D and 2D periodic domains. The deconvolution is performed by applying the iterative van Cittert method using explicit and compact filters of the 2nd to 8th order. We consider cases in which an approximate inverse filter $ G_\alpha^{-1} $ formulated to deconvolve an original function from a filtered one $ ( \overline{f} = G \ast f ) $ is constructed based on: (a) $G$ the same as used to define $ \overline{f} = G \ast f $; (b) $ G $ different than the one used to define $ \overline{f} = G \ast f $. In case (a), the convergence rate of the deconvolution process is much better when compact filters are used. This is attributed to a flatter transfer function of this type of filter and thus a smaller deterioration of the input function $ \overline{f} $. Case (b) reflects a real situation in which the precise definition of a basic filter $G$ used in $ \overline{f} = G \ast f $ is unknown. We found that when $ G_\alpha^{-1} $ is formulated based on $G$ of a higher order than the one used to define $ \overline{f} $ the reconstructed function $ f^\ast = G_\alpha^{-1} \ast \overline{f} $ is suppressed compared to the original function $f$. On the other hand, the deconvolution process performed with the use of $ G_\alpha^{-1} $ defined based on $G$ of a lower order than the order of the basic filter significantly amplifies the reconstructed function $ f^\ast $. As a result, the function $ f^\ast $ contains more energy than the function $f$, especially in the range of small and high-frequency scales. This effect is particularly strong when explicit filters of different orders are used. The impact of the filter type in the practical application of deconvolution is demonstrated based on large eddy simulations (LES) of a 2D decaying homogenous turbulent flow. LES combined with an approximate deconvolution method (ADM) for the computation of sub-filter terms shows better accuracy than in the case when these terms are modelled using the classical Smagorinsky model or when they are neglected (no-model approach). This analysis consists of comparisons of the evolution of total energy, energy spectra, and higher-order moments (variance, skewness, kurtosis) of the velocity components and vorticity. We found that more accurate results are obtained when the deconvolution is performed using the explicit filters even if the deconvolution process based on the compact filters was found to converge faster in 1D and 2D test cases. Most likely this is because in the performed LES the explicit filters correspond better to an unknown filter induced by discretisation.
Źródło:
Archives of Mechanics; 2023, 75, 1-2; 107-149
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roughness of Filters in Equality Algebras
Autorzy:
Rezaei, Gholam Reza
Borzooei, Rajab Ali
Aaly Kologani, Mona
Jun, Young Bae
Powiązania:
https://bibliotekanauki.pl/articles/43180962.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
equality algebra
approximation space
D-lower approximation
D-upper approximation
filter
D-lower filter
D-upper filter
Opis:
Rough set theory is an excellent mathematical tool for the analysis of a vague description of actions in decision problems. Now, in this paper by considering the notion of an equality algebra, the notion of the lower and the upper approximations are introduced and some properties of them are given. Moreover, it is proved that the lower and the upper approximations define an interior operator and a closure operator, respectively. Also, using D-lower and D-upper approximation, conditions for a nonempty subset to be definable are provided and investigated that under which condition D-lower and D-upper approximation can be filter.
Źródło:
Bulletin of the Section of Logic; 2023, 52, 1; 1-18
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmniejszenie powierzchni infiltracji ścieków do gruntu dzięki zastosowaniu filtrów doczyszczających
Reduction of soil infiltration area thanks to the wastewater secondary treatment filters
Autorzy:
Spychała, M.
Mazurkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/401697.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
filtr piaskowy
złoże zraszane
filtr włókninowy
infiltracja ścieków
grunt
sand filter
trickling filter
textile filter
wastewater infiltration
soil
Opis:
Celem artykułu było określenie możliwości i celowości zastosowania filtrów doczyszczających przed odprowadzaniem ścieków do ziemi w kontekście spełnienia warunków aktualnego Rozporządzenia Ministra Środowiska z dnia 18 listopada 2014 r. w sprawie warunków, jakie należy spełnić przy wprowadzaniu ścieków do wód lub do ziemi, oraz w sprawie substancji szczególnie szkodliwych dla środowiska wodnego. Ze względu na spodziewane w praktyce zastosowanie i popularność jako warianty porównawcze zastosowano reaktory o bardzo prostej konstrukcji. Porównano uśrednione wartości zmniejszenia BZT5, ChZTCr i zawiesiny ogólnej dla trzech technologii filtrów doczyszczających: złoża biologicznego zraszanego z naturalną wentylacją, filtra piaskowego odkrytego oraz filtra włókninowego. Dodatkowo jako czwarty wariant zaprezentowano prosty model matematyczny i pozwalający na oszacowanie BZT5 na odpływie z biologicznego złoża zraszanego celem zinterpretowania danych empirycznych. Model ten mimo dużej przydatności jest rzadko stosowany w naszym kraju. Stwierdzono możliwość zmniejszenia powierzchni infiltracji (rozsączania) na skutek zastosowania filtrów doczyszczających (powierzchnia po redukcji stanowi 38–63% powierzchni wejściowej). W przypadku dużego pierwotnego zapotrzebowania powierzchni pod drenaż rozsączający zysk w kosztach (kilka tysięcy złotych) wynikający z jej zmniejszenia może nawet znacząco przekraczać koszt zakupu taniego filtra doczyszczającego. Dodatkowo zmniejszenie zajętej powierzchni działki (w skrajnych przypadkach nawet o 100 m2), dzięki zastosowaniu filtra doczyszczającego, umożliwia wykorzystanie niezajętej powierzchni na inne cele i daje w ten sposób dodatkową korzyść ekonomiczną.
The aim of the article was to determine the feasibility and advisability of the use of secondary filters applied before discharge of wastewater into the ground in the context of the fulfillment of the conditions of the current Regulation of the Minister of Environment of 18 November 2014 on the conditions to be met during the discharge of wastewater into the water or the ground and on substances particularly harmful to the aquatic environment. Due to expected in practice, an application and popularity, as compared variants, reactors having a very simple construction were used. The average values of removal of BOD5, COD and total suspended solids for three secondary filters technologies: biological trickling filter with natural ventilation, sand filter and nonwoven filter were compared. Additionally, as a fourth option a simple mathematical model has been presented. This model allows to estimate of BOD5 at the outflow from biological trickling filter and to verify the empirical data. Despite a large usefulness, it is rarely used in our country. It has been found the possibility of reduction of the infiltration area (surface area after reduction is 38–63% of the initial value) due to the application of secondary filters. In the case of a high initial demand of the terrain area for drainage localization the benefit in costs resulting from the reduction (several thousand of PLN) or may even significantly exceed the cost of buying and installing a cheap secondary filter. In addition, reduction the occupied area of the lot (in extreme cases up to 100 m2) by using the secondary filter allows to use the unoccupied space for other purposes, and thus gives additional economic advantage.
Źródło:
Inżynieria Ekologiczna; 2016, 47; 82-88
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 755

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