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Tytuł:
Dynamical properties of a modified chaotic Colpitts oscillator with triangular wave non-linearity
Autorzy:
Suresh, Rasappan
Sathish Kumar, Kumaravel
Regan, Murugesan
Niranjan Kumar, K. A.
Narmada Devi, R.
Obaid, Ahmed J.
Powiązania:
https://bibliotekanauki.pl/articles/27312004.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
chaos
Colpitts oscillator
Lyapunov exponent
diffusion
stability
synchronization
triangular wave non-linearity
Opis:
The purpose of this paper is to introduce a new chaotic oscillator. Although different chaotic systems have been formulated by earlier researchers, only a few chaotic systems exhibit chaotic behaviour. In this work, a new chaotic system with chaotic attractor is introduced for triangular wave non-linearity. It is worth noting that this striking phenomenon rarely occurs in respect of chaotic systems. The system proposed in this paper has been realized with numerical simulation. The results emanating from the numerical simulation indicate the feasibility of the proposed chaotic system. More over, chaos control, stability, diffusion and synchronization of such a system have been dealt with.
Źródło:
Archives of Control Sciences; 2023, 33, 1; 25--53
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comprehensive circumscribing of non-linearity cases of a water supply system with smooth flow control
Autorzy:
Orłowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/241404.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
flow reducing valve
non-linearity of system
pressure reducing valve
steady flow
variable frequency drives
water supply system
Opis:
The descriptions found in the literature, of cases of even relatively strong non-linearity of the water supply systems, as well as their mathematical treatment, are rare and incomplete. They refer mainly to the non-linearity with respect to smooth flow control components (for instance, to the operation of pressure reducing valves (PRV), flow reducing valves (FRV) and pumps with motors equipped with smooth rotational speed control - variable frequency drives (VFD)). The article proposes a formally correct method of a comprehensive solution of the above non-linearity cases based on successive simulations with some dynamic analysis of the sensitivity of the system to the operation of the smooth control components mentioned. An appropriate algorithm controlling the effectiveness of the calculations secures correct description of the behaviour of the system for an arbitrary, in practice, method of control of flows, even if all the proposed smooth control methods are used simultaneously. The effects of the use of the solutions presented in mathematical modelling are illustrated by selected results of simulation carried out for an existing water supply system.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 1; 7-30
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-linearity on pull-out test of cohesive soil using low tensile strengths of geogrids
Autorzy:
Widodo, S.
Ibrahim, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/115809.pdf
Data publikacji:
2014
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
pull-out test
tensile strength
geogrid
ITD
non-linear
Opis:
Influence of geosynthetics inserted into cohesive granular soil was obviously investigated using geosynthetics-soil-interaction-testing device (ITD). Observations were already made during undertaking pull-out test, and then the results revealed that a correlation between shear stress and normal stress exhibits non-linear behaviour. In this paper, three approaches of trend-lines namely linear, logarithmic, and polynomial were compared. From analysis, polynomial trend line gave the best correlation among others. The final equation is very important part when estimating more accurate values of cohesion and friction angle design purpose.
Źródło:
Challenges of Modern Technology; 2014, 5, 1; 34-37
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for ship’s rolling period prediction with regard to non-linearity of GZ curve
Autorzy:
Wawrzyński, W.
Krata, P.
Powiązania:
https://bibliotekanauki.pl/articles/281346.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
ship natural roll period
GZ approximation
rolling prediction
safety against capsizing
Opis:
The paper deals with the problem of prediction of the rolling period. A special emphasis is put on the practical application of the new method for rolling period prediction with regard to non-linearity of the GZ curve. The one degree-of-freedom rolling equation is applied with using the non-linear stiffness moment and linear damping moment formulas. A number of ships are considered to research the discrepancies between the pending GM-based IMO- -recommended method and the results of conducted numerical simulations performed for a wide range of operational loading conditions. Since the research shows some drawbacks of the IMO formula for the ship rolling period, a new formula is worked out and proposed instead.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1329-1343
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of noise and non-linearity of I-V characteristics of positive temperature coefficient chip thermistors
Autorzy:
Sita, Z.
Sedlakova, V.
Majzner, J.
Sedlak, P.
Sikula, J.
Grmela, L.
Powiązania:
https://bibliotekanauki.pl/articles/220721.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PTC chip sensors
noise spectroscopy
I-V characteristic non-linearity
quality evaluation
Opis:
Noise spectroscopy and I-V characteristic non-linearity measurement were applied as diagnostic tools in order to characterize the volume and contact quality of positive temperature coefficient (PTC) chip sensors and to predict possible contact failure. Correctly made and stable contacts are crucial for proper sensing. I-V characteristics and time dependences of resistance were measured for studied sensors and, besides the samples with stable resistance value, spike type resistance fluctuation was observed for some samples. These spikes often disappear after about 24 hours of voltage application. Linear I-V characteristics were measured for the samples with stable resistance. The resistance fluctuation of burst noise type was observed for some samples showing the I-V characteristic dependent on the electric field orientation. We have found that the thermistors with high quality contacts had a linear I-V characteristic, the noise spectral density is of 1/f type and the third harmonic index is lower than 60 dB. The samples with poor quality contacts show non-linear I-V characteristics and excess noise is given by superposition of g-r and 1/fn type noises, and the third harmonic index is higher than 60 dB.
Źródło:
Metrology and Measurement Systems; 2013, 20, 4; 635-644
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling Suppression of Non-Linear Machine Vibration
Autorzy:
Vondrich, J.
Thöndel, E.
Powiązania:
https://bibliotekanauki.pl/articles/971125.pdf
Data publikacji:
2009
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
Matlab
non-linearity
vibration
machine
Opis:
In this paper, the coupled non-linear differential equations of the model of machine as non-linear dynamical two degree of freedom vibrating system including cubic non-linearity are solved. The system consists of the main system and the absorber. Consider the non-linearity dynamical vibrating system as a model machine, which is compiled of a driven motor, gearbox and mechanisms with elastic and damping parts and driven parts. The absorber is used to control the main system vibrations when subjected to external excitation force. This system represents many applications in machine tools, ultrasonic cutting process, etc. Optimum working conditions for the absorber are by the same frequencies ω = ω2 [1] of the action force F =F0 sinω t and main mass m1. The effects of different parameters of the system are studied numerically with Matlab.
Źródło:
Journal of Machine Engineering; 2009, 9, 2; 45-50
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical aspects of testing superconducting electromagnets by the capacitor discharge method taking into account the non-linearity of circuit parameters
Autorzy:
Michna, Michał
Wilk, Andrzej
Wołoszyk, Marek
Ziółko, Michał
Galla, Stanisław
Szwangruber, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/24202739.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
diagnostic
discharge method
superconducting electromagnets
Opis:
The article presents selected issues related to the development and testing of the diagnostics systems dedicated for superconducting electromagnets. The systems were con- structed to assess the production quality of superconducting electromagnets of the SIS100 synchrotron, a new accelerator being built as part of the Facility of Antiproton and Ion Re- search (FAIR). One of the systems is used for automatic checking of electrical connection parameters and the continuity of electric circuits. The role of the second device is to assess the quality of winding insulation and to estimate circuit parameters of electromagnet coils using the capacitor discharge method. The work presents measurements and analysis of current and voltage waveforms acquired during discharges on a magnet coil simulator and on the SIS100 main dipole electromagnet.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 323--338
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variations in developmental patterns across pragmatic features
Autorzy:
Li, Qiong
Powiązania:
https://bibliotekanauki.pl/articles/780817.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
L2 pragmatic development; variations
longitudinal perspective
non-linearity
Opis:
Drawing on the findings of longitudinal studies in uninstructed contexts over the last two decades, this synthesis explores variations in developmental patterns across second language (L2) pragmatic features. Two synthesis questions were addressed: (a) What are the variations in developmental patterns across pragmatic features?, and (b) What are the potential explanations for the variations? In response to the first question, previous studies showed that L2 pragmatic development is a non-linear, dynamic process, with developmental paces varying across pragmatic features (Ortactepe, 2013; Taguchi, 2010, 2011, 2012; Warga & Scholmberger, 2007). These studies revealed that some aspects of pragmatic features (e.g., semantic strategies of speech acts) develop faster than others (e.g., lexical features such as mitigators). In response to the second question, three potential explanations were identified to account for the developmental variations: (a) language-related, (b) situation-dependent, and (c) learner-related explanations, with three subcategories for the language-related explanation: (a) the functions of pragmatic features, (b) the frequency of availability of target features, and (c) the similarity and difference between languages with respect to the target feature.
Źródło:
Studies in Second Language Learning and Teaching; 2016, 6, 4; 587-617
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal strength analysis of a steel bolted connection under bolt loss conditions
Autorzy:
Grzejda, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/2087009.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
bolted connection
thermal strength
non-linearity
finite element method
preload
Opis:
The aim of the paper is to analyse an exemplary bolted connection under the conditions of loss of bearing capacity of some fasteners in the connection. The presented tests are numerical and concern an asymmetric bolted connection. The joined elements in the connection were modelled as 3D finite elements, and the fasteners were treated as hybrid models consisting of rigid heads and nuts, and flexible beams between them. The bolted connection was first preloaded according to six different tensioning orders using a standardised force. After all bolts were tensioned, the selected bolts were removed, simulating bolt damage. The connection was then tested for external loads with temperatures ranging from 20 to 600°C. The influence of loosening the connection on the load in the remaining bolts at the operational stage of the connection was investigated. The calculation results were compared with the test results for a healthy bolted connection. It was shown that the bearing capacity of the connection in the damaged state decreased by 13%.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 2; 269--274
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On determination of inductances for circuit models of AC machines
Autorzy:
Sobczyk, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/141479.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric machines
modelling magnetic non-linearity
dynamic inductances
non-linear inductances
Opis:
The paper discuss a problem of determination of inductances for AC machine windings when saturation of magnetic circuit is not neglected. For such cases, computation of magnetic field distribution in the machine magnetic circuit is a starting point for post processing procedures leading to various values, among others the co-energy in a given area and linkage fluxes of windings. This paper shows how to determine winding inductances in a nonlinear magnetic circuit from these two values and also how to compute directly nonlinear inductances. Problem is not trivial because such inductances are not uniquely determined as for linear case. In the paper a definition of nonlinear inductances is proposed which makes the choice unique.
Źródło:
Archives of Electrical Engineering; 2013, 62, 3; 487-496
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-linearity and the Purchasing Power Parity Hypothesis for Exchange Rate JPY/USD
Nieliniowość i hipoteza parytetu siły nabywczej pieniądza dla kursu walutowego JPY/USD
Autorzy:
Bruzda, Joanna
Koźliński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/907591.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
purchasing power parity
forecasting exchange rates
non-linear adjustment
non-linear error correction models
Opis:
In the paper we verify the purchasing power parity (PPP) hypothesis for the exchange rate JPY/USD for different time periods and price indexes. We build several forecasting models for this exchange rate including some non-linear specifications, for example the univariate BL-GARCH model and fundamental VEC models based on a long run equilibrium relationship. We have found that under some specific conditions the PPP hypothesis does hold. An adjustment process towards a long run equilibrium turned out to be of a non-linear nature. However, the impact of this adjustment on short-run dynamics of the exchange rate has a linear error correction form.
W artykule przedstawiamy wyniki weryfikacji hipotezy parytetu sity nabywczej pieniądza dla kursu walutowego JPY/USD dla różnych okresów i różnych indeksów cenowych. Prezentujemy kilka modeli prognostycznych dla tego kursu, włączając pewne specyfikacje nieliniowe, jak np. jednowymiarowy model BL-GARCH oraz fundamentalne modele VEC, oparte na zależności w długookresowym położeniu równowagi. Wyniki empiryczne wskazują, że przy pewnych specyficznych warunkach hipoteza PPP zachodzi. Proces dostosowania do długookresowego położenia równowagi okazuje się mieć postać nieliniową. Jednakże wpływ tego dostosowania na krótkookresową dynamikę kursu walutowego JPY/USD ma formę liniowej korekty błędem.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2005, 192
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonance of a structure with soil elastic waves released in non-linear hysteretic soil upon unloading
Autorzy:
Kowalczyk, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2172887.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
finite element modelling
earthquake engineering
wave propagation
soil dynamics
soil non-linearity
Opis:
High-frequency motion is often observed in small-scale experimental works carried out in flexible containers under simplified seismic loading conditions when single harmonic sine input motions are introduced at the base of a soil specimen. The source of the high-frequency motion has often been sought in experimental inaccuracies. On the other hand, the most recent numerical studies suggested that high-frequency motion in the steady-state dynamic response of soil subjected to harmonic excitation can also be generated as a result of soil elastic waves released in non-linear hysteretic soil upon unloading. This work presents an example of a finite element numerical study on seismic soil–structure interaction representative of an experimental setup from the past. The results show how high-frequency motion generated in soil in the steady-state response, apparently representative of soil elastic waves, affects the steady-state response of a structure, that is, it is presented how the structure in the analysed case resonates with the soil elastic waves. The numerical findings are verified against the benchmark experimental example to indicate similar patterns in the dynamic response of the structure.
Źródło:
Studia Geotechnica et Mechanica; 2022, 44, 4; 253--266
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reclaiming Queer Time: Queer Temporalities in Ali Smith’s "How to be Both"
Autorzy:
Navalón-Guzmán, Corpus
Powiązania:
https://bibliotekanauki.pl/articles/28407292.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Queer Temporalities
Queer Time
Non-linearity
Queer Narrative
Queer Studies
LGBTQIA+ Identity
Opis:
This article examines the different manifestations of alternative temporalities in Ali Smith’s Goldsmiths Award novel How to be Both (2014). My argument is that the novel ‘queers’ understandings of time in two significant ways: by highlighting new possibilities of narrative structure that challenge linear conceptions of time and by questioning regulated notions of developmental temporalities in terms of progression from childhood to heteronormative adulthood. Hence, by drawing on the compelling framework of queer temporalities, the main goal of this article is to analyze the mechanisms deployed by Ali Smith to generate unprecedented configurations of queer time.
Źródło:
Forum for Contemporary Issues in Language and Literature; 2023, 4; 68-78
2391-9426
Pojawia się w:
Forum for Contemporary Issues in Language and Literature
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Droppers’ stiffness influence on dynamic interaction between the pantograph and railway catenary
Autorzy:
Bryja, Danuta
Hyliński (Popiołek), Adam
Powiązania:
https://bibliotekanauki.pl/articles/215741.pdf
Data publikacji:
2019
Wydawca:
Instytut Kolejnictwa
Tematy:
railway catenary
pantographs
droppers’ slackening
geometrical non-linearity
vibration simulation
validation of simulation method
Opis:
Droppers connecting the contact wire and messenger wire of the railway catenary are characterized by zero or negligible compressive stiffness, hence they become slack under compression that is similar to bars’ buckling. The paper presents a numerical analysis of the influence of droppers slackening phenomenon on the dynamic interaction between the pantograph and catenary. The analysis is based on a simulation method presented by the authors in previous papers, in which the catenary is modelled as a complex cable system. In this paper, the simulation method is modified by introducing the residual compressive stiffness of droppers that is assumed as a given percent of tensile stiffness. Modification leads to geometrically non-linear equations of motion of the pantograph-catenary system. Two different algorithms for solving the problem of non-linearity are proposed, in both of them the Newmark numerical integration method is applied. Results of dynamic response simulations performed for different values of residual compressive stiffness of droppers are presented and compared. It is shown that the contact wire does not cooperate with the messenger wire in a large area around the pantograph when the compressive stiffness of droppers is assumed zero. As a result, the pantograph moving at high speed induces severe vibrations of the catenary. It is also shown that droppers should be designed to have the residual compressive stiffness equal to at least one percent of their tensile stiffness. This is sufficient to ensure an appropriate cooperation between messenger wire and contact wire, which is demonstrated by simulation results fulfilling requirements given in the standard PN-EN 50318: 2002.
Źródło:
Problemy Kolejnictwa; 2019, 183; 89-98
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Measurements on Loudspeaker Distortion: Current vs. Voltage Control
Autorzy:
Meriläinen, E.
Powiązania:
https://bibliotekanauki.pl/articles/176516.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
current driving
current control
loudspeaker distortion
current distortion
inductance non-linearity
voice coil former
Opis:
Modulation and harmonic distortion produced by ordinary moving-coil direct-radiator drive units are measured under current control and voltage control. A realistic two-tone test signal is used to investigate the detrimental effect of the voice coil electromotive forces on the voltage-to-current conversion that is critical with voltage control. Dramatic improvements in distortion performance are obtained with current control. Current nonlinearities in voltage-controlled speakers are shown to be the dominant source of modulation and odd harmonic distortions at signal frequencies above the fundamental resonance region. Currents in conductive voice coil formers also seem to be significant sources of distortion; with current control and non-conductive formers, odd harmonics and related modulation products virtually vanished in the upper midrange.
Źródło:
Archives of Acoustics; 2017, 42, 1; 71-81
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
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