Wszystkie pola: oscillators - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Impact oscillators : fundamentals and applications
Autorzy:: Trzaska, Z.
Powiązania:: https://bibliotekanauki.pl/articles/242533.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: nonlinear systems
impact oscillators
nonsmooth excitations
nonsmooth time transformation
hyperbolic numbers
Opis:: The paper presents results of the analysis of nonlinear oscillators with nonsmooth elements and nonlinear systems with nonsmooth forcing components. Main attention has been focused on highlighting specific properties of nonsmooth systems compared to their smooth counterparts. Nonsmooth transformation of the time variable and the replacement of initial issues by boundary problems have been taken as the base for the analytical method. Results of numerical simulations and computing in the form of graphs of displacements and velocity waveforms and attractors are presented. To fully identify the system's behaviour and meet high performance specifications recourse to model all dynamics together with their interactions has been taken into account. Strong interactions among the parts of the system are considered and the phenomenon of the impact is exhibited. It has been found that non-smooth dynamical systems reveal significant wealth of nonlinear phenomena, including a chaotic, that are unique to this potentially important class of nonlinear systems. In non-smooth systems at small change of parameters, a sudden transition from a stable periodic oscillation to the full range of chaotic oscillations may often occur. The dynamics of nonsmooth oscillations with shock external forcing is analysed by using a relatively new mathematical tool, which appears to be hyperbolic algebra. The key idea of this tool is steeped in of non-smooth time transformations (NSTT) for strongly nonlinear, but still smooth models.
Źródło:: Journal of KONES; 2015, 22, 1; 307-314
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: On Noise Analysis of Oscillators Based on Statistical Mechanics
Autorzy:: Thiessen, T.
Mathis, W.
Powiązania:: https://bibliotekanauki.pl/articles/226855.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nonlinear oscillators
thermal noise
statistical mechanics
Opis:: In this paper a new approach of thermal noise analysis of electronic oscillators is presented. Although nonlinear electronic oscillators are one of the most essential subcircuits in electronic systems typical design concepts for these oscillators are based on ideas of linear circuits. Because the functionality of oscillators depends on nonlinearities, advanced design methods are developed where nonlinearities are an integral part. Since low voltage oscillator concepts have to be developed in modern IC technologies there is a need to include at least thermal noise aspects into the design flow. For this reason we developed new physical descriptions of thermal noise in electronic oscillators where we use ideas from nonequilibrium statistical mechanics as well as the Langevin approach. We illustrate our concepts by some examples.
Źródło:: International Journal of Electronics and Telecommunications; 2010, 56, 4; 357-366
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Metamorphoses of resonance curves in systems of coupled oscillators
Autorzy:: Kyzioł, J.
Okniński, A.
Powiązania:: https://bibliotekanauki.pl/articles/279900.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: coupled oscillators
amplitude profiles
singular points
Opis:: We study dynamics of two coupled periodically driven oscillators in a general case and compare it with two simplified models. Periodic steady-state solutions to these system equations are determined within the Krylov-Bogoliubov-Mitropolsky approach. Amplitude profiles are computed. These two equations, each describing a surface, define a 3D curve – intersection of these surfaces. In the present paper, we analyse metamorphoses of amplitude profiles induced by changes of control parameters in three dynamical systems studied. It is shown that changes of the dynamics occur in the vicinity of singular points of these 3D curves.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1197-1204
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Synchronization of mechanical oscillators excited kinematically
Synchronizacja oscylatorów mechanicznych wymuszanych kinematycznie
Autorzy:: Perlikowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/281780.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: synchronizacja
oscylatory mechaniczne
pobudzenie kinematyczne
synchronization
mechanical oscillators
kinematic excitation
Opis:: In this paper, the behaviour of a system of coupled mechanical oscillators excited kinematically was studied numerically. Several methods of detection of synchronization were shown and advantages of each were mentioned. The relation between Lyapunov exponents and the synchronization state under different kinds of the excitation signal (harmonic, periodic and chaotic ones) was presented. It was demonstrated that the mode locking with excitation was dependent only on inner damping and completely uncorrelated with the connection between oscillators.
W artykule pokazano numeryczną analizę dynamiki sprzężonych oscylatorów mechanicznych wymuszonych kinematycznie. Przedstawiono przegląd najważniejszych metod detekcji synchronizacji, zwracając szczególną uwagę na ich własności. Następnie opisano powiązania między widmem wykładników Lapunowa, a różnymi typami synchronizacji. Zbadano odpowiedź układu dla różnych typów sygnału wymuszającego (harmonicznego, okresowego i chaotycznego). Udowodniono, że zamykanie modów pomiędzy sygnałem oscylatora a wymuszeniem zależne jest tylko od tłumienia wewnętrznego oscylatorów, natomiast jest niezależne od sprzężeń pomiędzy nimi.
Źródło:: Journal of Theoretical and Applied Mechanics; 2008, 46, 1; 185-204
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Surface Acoustic Wave Oscillators
Autorzy:: Sehmisch, Dieter
Trzeba, Erich
Powiązania:: https://bibliotekanauki.pl/articles/896299.pdf
Data publikacji:: 1990
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Opis:: Then: are principal advances in the field of application of surface acoustic wave (SAW) delay lines and resonators in stable microwave frequency sources in the frequency range from 100 MHz to 1 GHz and above Advances, applications and fundamental design will be described. The center frequencies of the realized oscillators are near 70 MHz and 200 MHz. Requirements for the amplifier are presented Results from frequency variation and modulation are demonstrated. Miniature SAW oscillators have been designed and fabricated based upon a combination of hybrid electronic circuitry and SAW delay line. The package for the oscillator is a PDL 24 with a volume of 28 X 34 X 5 mm³ This results in a rugged system Measurements of short and medium term stability of the oscillators will be described.
Źródło:: Acta Physicae Superficierum; 1990, 2
0867-2997
Pojawia się w:: Acta Physicae Superficierum
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Loop Gain of the Common-Drain Colpitts Oscillator
Autorzy:: Kazimierczuk, M. K.
Murthy-Bellur, D.
Powiązania:: https://bibliotekanauki.pl/articles/226711.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: band-pass feedback networks
Colpitts oscillator
common-drain amplifier
location of poles
loop gain
oscillation conditions
positive feedback
resonant oscillators
tuned oscillators
voltage-controlled oscillators (VCO)
Opis:: This paper presents the derivations of the voltage transfer functions of the amplifier A, the feedback network β, and the loop gain Τ of the common-drain (CD) Colpitts oscillator, using the small-signal model of the CD Colpitts oscillator. The derivation of the characteristic equation of the CD Colpitts oscillator is presented. Using the characteristic equation, the equation for the oscillation frequency of the sinusoidal output voltage and the condition for steady-state oscillation are derived. The characteristic equation is used to obtain a plot of trajectories of the poles of the CD Colpitts oscillator by varying the MOSFET small-signal transconductance gm. The locations of the complex conjugate poles depicting starting and steady-state conditions for oscillations are also presented.
Źródło:: International Journal of Electronics and Telecommunications; 2010, 56, 4; 423-426
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Synchronisation and periodisation of duffing oscillators coupled by elastic beam: finite element method approach
Synchronizacja mechanicznych oscylatorów Duffinga zamocowanych na elastycznej belce
Autorzy:: Chudzik, A.
Powiązania:: https://bibliotekanauki.pl/articles/280007.pdf
Data publikacji:: 2010
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: oscillators
elastic structure
frequency
Opis:: Results of numerical analysis of a structure witch consists of two identical chaotic oscillators suspended on an elastic element are presented. The numerical calculations have been carried out with the use of the professional ANSYS software (User's Gude ANSYS 10). The findings show that for given conditions of the excitation, the initially uncollerated chaotic oscillations of the structure become periodic and synchronous.
W artykule przedstawiono wyniki analizy numerycznej struktury składającej się z dwóch identycznych chaotycznych oscylatorów zawieszonych na sprężystej belce. Obliczenia numeryczne przeprowadzono stosując profesjonalny pakiet programu ANSYS. Wykazano, że dla danych warunków wzbudzenia, początkowo nie są skorelowane, chaotyczne oscylacje struktury stają się okresowe i synchroniczne. W warunkach, kiedy częstości wzbudzenia różnią się, zjawiska powyższe nie występują.
Źródło:: Journal of Theoretical and Applied Mechanics; 2010, 48, 2; 517-524
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A Random Number Generator Using Ring Oscillators and SHA-256 as Post-Processing
Autorzy:: Łoza, S.
Matuszewski, Ł.
Jessa, M.
Powiązania:: https://bibliotekanauki.pl/articles/963943.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: random numbers
cryptography
ring oscillators
hash functions
field programmable gate array (FPGA)
Opis:: Today, cryptographic security depends primarily on having strong keys and keeping them secret. The keys should be produced by a reliable and robust to external manipulations generators of random numbers. To hamper different attacks, the generators should be implemented in the same chip as a cryptographic system using random numbers. It forces a designer to create a random number generator purely digitally. Unfortunately, the obtained sequences are biased and do not pass many statistical tests. Therefore an output of the random number generator has to be subjected to a transformation called postprocessing. In this paper the hash function SHA-256 as postprocessing of bits produced by a combined random bit generator using jitter observed in ring oscillators (ROs) is proposed. All components – the random number generator and the SHA-256, are implemented in a single Field Programmable Gate Array (FPGA). We expect that the proposed solution, implemented in the same FPGA together with a cryptographic system, is more attack-resistant owing to many sources of randomness with significantly different nominal frequencies.
Źródło:: International Journal of Electronics and Telecommunications; 2015, 61, 2; 199-204
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Application of coupled neural oscillators for image texture segmentation and modeling of biological rhythms
Autorzy:: Strumiłło, P.
Strzelecki, M.
Powiązania:: https://bibliotekanauki.pl/articles/908378.pdf
Data publikacji:: 2006
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: rytm biologiczny
oscylacja nieliniowa
stymulator serca
biological rhythms
nonlinear oscillations
networks of synchronised oscillators
texture segmentation
cardiac pacemakers
Opis:: The role of relaxation oscillator models in application fields such as modeling dynamic systems and image analysis is discussed. A short review of the Van der Pol,Wilson-Cowan and Terman-Wang relaxation oscillators is given. The key property of such nonlinear oscillators, i.e., the oscillator phase shift (called the Phase Response Curve) as a result of external pulse stimuli is indicated as a fundamental mechanism to achieve and sustain synchrony in networks of coupled oscillators. It is noted that networks of such oscillators resemble a variety of naturally occurring phenomena (e.g., in electrophysiology) and dynamics arising in engineering systems. Two types of oscillator networks exhibiting synchronous behaviors are discussed. The network of oscillators connected in series for modeling a cardiac conduction system is used to explain causes of important cardiac abnormal rhythms. Finally, it is shown that a 2D network of coupled oscillators is an effective tool for segmenting image textures in biomedical images.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2006, 16, 4; 513-523
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

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

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