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Wyświetlanie 1-15 z 81
Tytuł:
Application of Neural Network for Testing Selected Specification Parameters of Voltage-Controlled Oscillator
Autorzy:
Grzechca, D.
Temich, S.
Powiązania:
https://bibliotekanauki.pl/articles/226212.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
specification driven testing
voltage controlled oscillator
ring oscillator
artificial neural network
Opis:
In this paper, the application of the Artificial Neural Network (ANN) algorithm has been used for testing selected specification parameters of voltage-controlled oscillator. Today, mixed electronic circuits specification time is an issue. An analog part of Phase Locked Loop is a voltage-controlled oscillator, which is very sensitive to variation of the technology process. Fault model for the integrated circuit voltage control oscillator (VCO) in ring topology is introduced and the before test stage classificatory is designed. In order to reduce testing time and keep the specification accuracy (approximation) on the high level, an artificial neural network has been applied. The features selection process and output coding for specification parameters are described. A number of different ANN have been designed and then compared with real specification of the VCO. The results obtained gives response in short time with high enough accuracy.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 2; 203-207
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and design of CMOS coupled multivibrators
Autorzy:
Casaleiro, J.
Lopes, H. F.
Oliveira, L. B.
Filanovsky, I.
Powiązania:
https://bibliotekanauki.pl/articles/397859.pdf
Data publikacji:
2010
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
multiwibrator
CMOS oscillator
multivibrator
quadrature outputs
van der Pol oscillator
WMTS appications
Opis:
In this paper a wideband MOS quadrature oscillator constituted by two multivibrators is presented. Two different forms of coupling, named here as soft and hard, are investigated. Simulations are performed in a 0.13 žm CMOS technology to obtain the tuning range, the synchronization transients, and the influence of mismatches in timing capacitors and charging currents on synchronization. It is found that hard coupling reduces the quadrature error (about 1°, with 5% mismatches in timing capacitors and charging currents) and results in a low phase-noise (about 2 dB improvement) with respect to soft coupling. Either a single multivibrator or coupled multivibrators can be locked to an external synchronizing harmonic frequency, and the locking range is investigated by simulations. The simulations are done for oscillators covering the WTMS frequency bands.
Źródło:
International Journal of Microelectronics and Computer Science; 2010, 1, 3; 249-256
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control of a duffing oscillator under parametric and external excitations
Optymalne sterowanie parametrycznym i zewnętrznie wzbudzonym oscylatorem Duffinga
Autorzy:
Nowoświat, A.
Powiązania:
https://bibliotekanauki.pl/articles/281471.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
perturbation control techniques
Duffing's oscillator
Opis:
The present paper deals with investigations of a stochastic model of the Duffing oscillator operating continuously. The standart theory of the optimal stochastic control described in Fleming and Richel (1975) is presented, as well as the application of these concept to the perturbation control techniques suggestes by Suhardio et al. (1992). The method presented in this paper is, therefore, a generalization of the method of the development of nonlinear control units into a series, as described for Duffing's deterministic oscillator involving stochastic system derived by the author and applied in his master thesis (Nowoświat, 1999). Detailed analysis and numerical calculations have been done using the Runge-Kutta procedures.
W pracy zaproponowano metodę perturbacji dla sterowania układów dynamicznych z wymuszeniami o charakterze białych szumów Gaussowskich i kryteriami w przestrzeni funkcji gęstości prawdopobieństw. Przy wyznaczaniu współczynników sterowania, jak również współczynników funkcji Lapunowa, korzysta się z równania Bellmana. Tak wyznaczone współczynniki niezbędne są do minimalizacji funkcji kosztów I. Szczegółową analizę i obliczenia numeryczne wykonano za pomocą procedur Rungego-Kutty.
Źródło:
Journal of Theoretical and Applied Mechanics; 2002, 40, 2; 435-447
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aging of ground Global Navigation Satellite System oscillators
Autorzy:
Maciuk, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/2087021.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
clock
GNSS
oscillator
positioning
time
Opis:
Global Navigation Satellite System (GNSS) are widely used in many areas of human life and activity. The proper functioning of GNSS systems depends on several factors, the most important of which is the correct knowledge of time. The position indirectly is based on the knowledge of the distance, which is determined based on time with the knowledge of the speed of the electromagnetic wave. Thus, proper (accurate) knowledge of time (GNSS clock stability) is a key to precise positioning. In this text, the long-term stability of the GNSS station clocks covering the years 1994-2020 was analysed. For this purpose, the corrections of the clocks at selected permanent stations were used, and their stability was determined for all years separately. Then the change of clock stability over time and the search for correlation were analysed. As the results showed, there are clearly differences between four of the type of oscillators analysed. In case of the comparison on an annual basis, no change over time was found.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 2; 371--376
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steady state vibration of the periodically forced and damped pure nonlinear two-degrees-of-freedom oscillator
Autorzy:
Cveticanin, Livija
Zukovic, Miodrag
Cveticanin, Dragan
Powiązania:
https://bibliotekanauki.pl/articles/280690.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
non-harmonic excitation
force identification
steady-state motion
van der Pol oscillator
Duffing oscillator
Opis:
In the paper, a pure nonlinear and damped two-mass oscillator excited with a periodical force is considered. The oscillator is modelled with a system of two coupled second order nonlinear and non-homogenous equations. Using the model, two problems are investigated: one, identification of the excitation force for the known vibrating response of the system, and the second, determination of vibrations of the system excited with the known periodical force. Using the steady-state motion of the nonlinear oscillator, a method for identification of the excitation force is developed. For the pure nonlinear oscillator, it is obtained that the forcing function has the form of the Ateb function. However, if the excitation force is known, the procedure for computing the steady-state vibration of the system is introduced. The solution corresponds to steady-state vibrations of the free oscillator, but the amplitude and phase are assumed to be time variable. The averaged solutions are obtained for the pure nonlinear oscillator with an additional linear elastic force and for the van der Pol oscillator. Analytically obtained solutions are compared with numerical ones. They are in good agreement.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 445-460
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Parameters for a Damped Oscillator Excited by a Sequence of Random Pulses
Autorzy:
Ozga, A.
Powiązania:
https://bibliotekanauki.pl/articles/177370.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
random pulses
oscillator with damping
vibroacoustics
Opis:
The paper is another step in discussion concerning the method of determining the distributions of pulses forcing vibrations of a system. Solving a stochastic problem for systems subjected to random series of pulses requires determining the distribution for a linear oscillator with damping. The goal of the study is to minimize the error issuing from the finite time interval. The applied model of investigations is supposed to answer the question how to select the parameters of a vibrating system so that the difference between the actual distribution of random pulses and that determined from the waveform is as small as possible.
Źródło:
Archives of Acoustics; 2014, 39, 4; 645-652
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical and equivalent linearization techniques with probability density criteria
Autorzy:
Socha, L.
Powiązania:
https://bibliotekanauki.pl/articles/280239.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
random vibration
linearization techniques
Duffing oscillator
Opis:
The concept of statistical and equvalent linearization with probability density criteria for dynamic systems under Gaussian excitation is considered in the paper. New criteria of linearization and two approximate approaches are proposed. In the first one (statistical linearization) in order to establish the linearization coefficients and response characteristics the output probability density functions of statistic nonlinear element and the corresponding static linearized element are used in an iterative procedure. In the second approach (equivalent linearization) the direct minimization of a criterion based on output probability density functions of dynamic nonlinear system is proposed. The detailed analysis and numerical results are given for the Duffing oscillator.
W pracy zaproponowano metodę statystycznej i równoważnej linearyzacji dla układów dynamicznych z wymuszeniami o charakterze białych szumów Gaussowskich i kryteriami w przestrzeni funkcji gęstości prawdopodobieństw. Przy wyznaczaniu współczynników linearyzacji i charakterystyk rozwiązań układu dynamicznego za pomocą metody statystycznej linearyzacji korzysta się z minimalizacji kryterium uwzględniającego różnicę wyjściowych funkcji gęstości prawdopodobieństw odpowiednio elementu nieliniowego zlinearyzowanego oraz pewnej procedury iteracyjnej. W przypadku równoważnej linearyzacji przeprowadza się bezpośrednią minimalizację kryterium uwzględniającego różnicę wyjściowych funkcji gęstości prawdopodobieństw odpowiednio układów dynamicznych nieliniowego i zlinearyzowanego. Szczegółową analizę i obliczenia numeryczne przeprowadzono dla oscylatora Duffinga.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 2; 369-382
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative picture of structural and electrochemical properties of fluorinated liquid crystals - a theoretical study
Autorzy:
Prasad, S.
Ojha, D.
Powiązania:
https://bibliotekanauki.pl/articles/1055084.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
HOMO
LUMO
phase stability
oscillator strength
Opis:
A comparative picture of structural and electrochemical properties of fluorinated liquid crystals viz. p-phenylene-4-methoxybenzoate-4-trifluoromethylbenzoate (FLUORO1), and 4-propyloxyphenyl-4-(4-trifluoromethyl benzoyloxy) benzoate (FLUORO2) have been studied. The structure of liquid crystals have been optimized by the density functional B3LYP with 6-31 + G(d) basis set using crystallographic geometry as input. Molecular charge distribution, and phase stability of these molecules have been analyzed based on the Mulliken, and Loewdin population analysis. The electronic absorption spectra of molecules have been simulated by employing the density functional theory method. The effects of substituted groups on electrochemical properties such as highly occupied molecular orbital, lowly unoccupied molecular orbital energies, and energy gap (E_{g}) have been investigated. It has been observed that substitution of additional alkyl groups leads to prominent decrement in electrochemical properties.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1383-1386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oscillator strength of optical transitions in InGaAsN/GaAsN/GaAs quantum wells
Autorzy:
Mika, A
Sek, G
Ryczko, K
Kozub, M
Musial, A
Marynski, A
Misiewicz, J
Langer, F
Höfling, S
Appel, T
Kamp, M
Forchel, A
Powiązania:
https://bibliotekanauki.pl/articles/173586.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dilute nitride
quantum well
oscillator strength
Opis:
Experimental and theoretical considerations and results on the effect of nitrogen incorporation on the oscillator strength of optical transitions in InGaNAs/GaAs quantum wells (QWs) are presented. Therefore, a set of dilute nitride quantum well structures was grown by molecular beam epitaxy. Optical investigation via spectroscopic methods have been performed at various temperatures for both the as-grown samples, and after rapid thermal annealing. The fundamental transition energy and its oscillator strength vs. the QW composition have been systematically investigated. Additionally, the effect of the bandgap discontinuities on the transitions intensity has also been considered. The experimental data have been confronted with the band structure calculations within the effective mass approximation employing a two level repulsion model for the nitrogen-containing structures. The obtained results are crucial for possible future applications employing the quantum well in cavity structures and bringing the practical exploitation of quantum electrodynamics phenomena to the telecommunication spectral range.
Źródło:
Optica Applicata; 2013, 43, 1; 53-60
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear response of a harmonically driven oscillator in magnetic field
Autorzy:
Przybyłowicz, P.
Szmidt, T.
Powiązania:
https://bibliotekanauki.pl/articles/229889.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinear vibrations
oscillator
chaos
stability
magnetic damping
Opis:
The paper presents analysis of nonlinear response of a classical mechanical oscillator placed within a magnetic field and driven by a harmonic force. With an appropriate choice of control parameters, the system vibrates chaotically between different equilibrium positions. To prove this result, Lyapunov exponents have been calculated using the algorithm proposed by Rangarajan G., Habib S. and Ryne R.: Physical Review Letters, vol. 80, (1998). Moreover, the appropriate time series, phase portrait, Poincar'e cross-section and power spectrum are given to support the conclusion.
Źródło:
Archives of Control Sciences; 2010, 20, 1; 19-30
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikrokomputer Raspberry Pi jako sterownik systemu pomiarowego
Raspberry Pi as a measurement system control unit
Autorzy:
Michalak, S.
Powiązania:
https://bibliotekanauki.pl/articles/154761.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Raspberry Pi
oscylator pierścieniowy
FPGA
ring oscillator
Opis:
W artykule przedstawiono system pomiarowy, w którym nadrzędną rolę sprawuje mały, cieszący się coraz większą popularnością, mikrokomputer edukacyjny Raspberry Pi. System zaprojektowany został do wizualizacji rozkładu temperatury wewnątrz struktury układu reprogramowalnego FPGA, na podstawie dokonanych pomiarów częstotliwości oscylatorów pierścieniowych zaimplementowanych wewnątrz układu. Sterowanie procesem pomiarowym, akwizycja danych i prezentacja wyników nadzorowana jest przez mikrokomputer Raspberry Pi.
In this paper the system based on Raspberry Pi, a popular educational microcomputer [1] is described. In this system, a programmable FPGA Spartan-3 XC3S200 [5] device was tested. The Raspberry Pi worked as a control unit for the whole system (Fig. 1). A part of the system was implemented inside the tested structure (Fig. 2). It was an array of ring oscillators (Fig. 3), as temperature sensors, with a structure for controlling the ring oscillators. Simple ring oscillators are often implemented in FPGA devices. They are used both as a single element or an array of sensors for measuring the chip temperature [2, 3, 4]. The frequency of the activated sensor was measured outside by an oscilloscope (SCPI command was used). The frequency was dependent on temperature. The sensors can be located in different areas of a chip [6, 7]. In case of the tested device 36 sensors were used, but generally it depends on a tested device [8, 9]. The Raspberry Pi controlled the measurement process via an SPI serial interface. The results were collected from the oscilloscope via a UART/RS232 serial interface. The relation between frequency and temperature (Fig. 4) as well as 2D visualizations (Fig. 5) were made using Gnuplot and Scilab. The results should visualize the temperature distribution inside the device, but first right calibration of sensors should be made. The location of elements inside the FPGA sensor is of great significance [10], so in the case of an array of sensors, each ring oscillator should be analyzed and calibrated independently.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 8, 8; 649-651
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified laplace based variational iteration method for the mechanical vibrations and its applications
Autorzy:
Rehman, Shahida
Hussain, Akhtar
Rahman, Jamshaid Ul
Anjum, Naveed
Munir, Taj
Powiązania:
https://bibliotekanauki.pl/articles/2106003.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
variational iterative method
nonlinear oscillator
Laplace transform
Opis:
In this paper, we are putting forward the periodic solution of non-linear oscillators by means of variational iterative method (VIM) using Laplace transform. Here, we present a comparative study of the new technique based on Laplace transform and the previous tech-niques of maximum minimum approach (MMA) and amplitude frequency formulation (AFF) for the analytical results. For the non-linear oscillators, MMA, AFF and VIM by Laplace transform give the same analytical results. Comparison of analytical results of VIM by Laplace transform with numerical results by fourth-order Runge–Kutta (RK) method conforms the soundness of the method for solving non-linear oscillators as well as for the time and boundary conditions of the non-linear oscillators.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 2; 98--102
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A 24 GHz PHEMT-based oscillator
Autorzy:
Lewandowski, A.
Kompa, G.
Mwema, W.
Wiatr, W.
Powiązania:
https://bibliotekanauki.pl/articles/309225.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
generator mikrofalowy
opór ujemny
microwave oscillator
oscillator design method
negative resistance
describing function
nonlinear PHEMT model
microstrip components models
Opis:
We present a systematic nonlinear procedure for designing microwave oscillators utilising a nonlinear PHEMT model, the negative resistance approach and the describing function concept. The procedure is applied in the design of a 24 GHz oscillator, which is then realised in hybrid technology. Measurement results show - 6% shift in the frequency but an acceptable agreement in the output power. A detailed analysis shows that the frequency shift arises mainly from inadequate CAD models in the K band, for the microstrip components employed in our design.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 1; 15-19
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical solution of non-homogenous fractional oscillator equation in integral form
Autorzy:
Ciesielski, M.
Błaszczyk, T.
Powiązania:
https://bibliotekanauki.pl/articles/281890.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
fractional oscillator equation
fractional integral equation
numerical solution
Opis:
In this paper, a non-homogenous fractional oscillator equation in finite time interval is considered. The fractional equation with derivatives of order α ∈ (0, 1] is transformed into its corresponding integral form. Next, a numerical solution of the integral form of the considered equation is presented. In the final part of this paper, some examples of numerical solutions of the considered equation are shown.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 959-968
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Producing Random Bits with Delay-Line-Based Ring Oscillators
Autorzy:
Jessa, M.
Matuszewski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/227302.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ring oscillator
jitter
random bit generator
combined generator
Opis:
One of the sources of randomness for a random bit generator (RBG) is jitter present in rectangular signals produced by ring oscillators (ROs). This paper presents a novel approach for the design of delays used in these oscillators. We suggest using delay elements made on carry4 primitives instead of series of inverters or latches considered in the literature. It enables the construction of many high frequency ring oscillators with different nominal frequencies in the same field programmable gate array (FPGA). To assess the unpredictability of bits produced by RO-based RBG, the restarts mechanism, proposed in earlier papers, was used. The output sequences pass all NIST 800-22 statistical tests for smaller number of ring oscillators than the constructions described in the literature. Due to the number of ROs with different nominal frequencies and the method of construction of carry4 primitives, it is expected that the proposed RBG is more robust to cryptographic attacks than RBGs using inverters or latches as delay element.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 1; 41-50
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
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