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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:
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:
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:
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:
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:
Frictional heating during sliding of two semi-spaces with arbitrary thermal nonlinearity
Autorzy:
Och, E.
Powiązania:
https://bibliotekanauki.pl/articles/386528.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
frictional heating
arbitrary thermal non-linearity
thermosensitive materials
temperatura tarcia
materiały termoczułe
nieliniowość termiczna
Opis:
Analytical and numerical solution for transient thermal problems of friction were presented for semi limited bodies made from thermosensitive materials in which coefficient of thermal conductivity and specific heat arbitrarily depend on the temperature (materials with arbitrary non-linearity). With the constant power of friction assumption and imperfect thermal contact linearization of nonlinear problems formulated initial-boundary thermal conductivity, using Kirchhoff transformation is partial. In order to complete linearization, method of successive approximations was used. On the basis of obtained solutions a numerical analysis of two friction systems in which one element is constant (cermet FMC-845) and another is variable (grey iron ChNMKh or aluminum-based composite alloy AL MMC) was conducted.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 4; 204-208
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
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:
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
Tytuł:
Odbiorca medialny w erze Web 2.0
The media recipient in the Web 2.0 era
Autorzy:
Maćkiewicz, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/31339533.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Gdański. Wydawnictwo Uniwersytetu Gdańskiego
Tematy:
media
odbiorca
internet
nielinearność
multimodalność
recipient
non-linearity
multimodality
Opis:
Artykuł poświęcony jest nakreśleniu sylwetki nowego odbiorcy czy raczej użytkownika mediów. Zakłada się, że przyczyniły się do tego nowe technologie, a raczej nowy sposób używania tych technologii (Web 2.0). Nowy sposób używania to nieograniczony wybór treści, a także czasu, miejsca i sposobu docierania do nich, recepcja nielinearna i powierzchowna, interaktywność, możność modyfikowania i tworzenia przekazów. Nowy odbiorca jest głównie powierzchowny, niecierpliwy i impulsywny, odbierający nielinearnie i kompleksowo, nastawiony bardziej na obraz niż na słowo, aktywny.
The article is devoted to outlining the profile of a new media recipient, or rather a media user. It is assumed that new technologies, or rather a new way of using these technologies (Web 2.0), contributed to this. The new way of using means unlimited choice of content as well as time, place and way of reaching it; non-linear and superficial reception; interactivity; the possibility of modifying and creating messages. The new user is mainly superficial, impatient and impulsive, receiving non-linearly and comprehensively, more image-oriented than word-oriented, active.
Źródło:
Media Biznes Kultura; 2023, 1(14); 9-17
2451-1986
2544-2554
Pojawia się w:
Media Biznes Kultura
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:
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:
Confidence intervals for large non-centrality parameters
Autorzy:
Inacio, Sonia
Oliveira, Manuela
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729746.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
asymptotic linearity
non-centrality parameters
highly significant
F tests
measure relevance
Opis:
We use asymptotic linearity to derive confidence intervals for large non-centrality parameters. These results enable us to measure relevance of effects and interactions in multifactors models when we get highly statistically significant the values of F tests statistics. We show how to use our approach by considering two sets of data as application examples.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 45-56
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Bolt Forces and Normal Contact Pressure Between Elements in the System With Many Bolts for its Assembly Conditions
Autorzy:
Grzejda, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/101884.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
multi-bolted system
non-linearity
FE-modelling
Winkler contact model
preload
system wielośrubowy
nieliniowość
modelowanie FE
model kontaktowy Winklera
napięcie wstępne
Opis:
The paper put forward a thesis that modelling dissymmetric non-linear multi-bolted connections as a system is possible. Modelling of the systems composed of four subsystems on the assembly state was presented. These subsystems included: a couple of joined elements (a flange and a support), a contact layer between them, and bolts. The physical model of the system was described considering the tightening of bolts according to a specific sequence. In this model: the flange and the support were built using spatial finite elements, the contact layer was formed as the non-linear Winkler model, and the bolts were replaced with simplified models made of flexible beams. The calculation model which can be applied to determine the changes in bolt forces, as well as in the normal contact pressure between the joined elements during the tightening of the system and at its end, was presented. The results of sample calculations for the selected multi-bolted system were shown.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 1; 116-121
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite Element Modelling of a Pair of Flexible Elements Contact Preloaded and Externally Loaded with an Arbitrary Force
Autorzy:
Grzejda, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/103248.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
contact joint
non-linearity
finite element method
preload
połączenie stykowe
nieliniowość
metoda elementów skończonych
wstępne ładowanie
Opis:
In the paper, the numerical tests of the contact of a pair of flexible elements were presented. The non-linear phenomena occurring in the contact zone of two elements have been considered separately for the assembly and operational condition of the joint. The physical and mathematical models of the contact joint created using the finite element method were proposed. The contact joint is treated as a system composed of the subsystems: two of them are joined elements and the third one is the contact layer between the elements. The calculations results for the selected contact joint were given.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 3; 118-124
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
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
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