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Tytuł:
A multimode approach to geometrically non-linear forced vibration of beams carrying point masses
Autorzy:
Fakhreddine, Hatim
Adri, Ahmed
Chajdi, Mohcine
Rifai, Said
Benamar, Rhali
Powiązania:
https://bibliotekanauki.pl/articles/328557.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
geometrical non-linearity
forced vibrations
multimode approach
stress distribution
point mass
nieliniowość geometryczna
drgania wymuszone
rozkład naprężeń
Opis:
The present work deals with the geometrically non-linear forced vibrations of beams carrying a concentric mass under different end conditions. Considering the axial strain energy and expanding the transverse displacement in the form of a finite series of spatial functions, the application of Hamilton's principle reduces the vibration problem to a non-linear algebraic system solved by an approximate method developed previously. In order to validate the approach, comparisons are made of the present solutions with those previously obtained by the finite element method. Focus is made here on the analysis of the non-linear stress distribution in the beam with an attached mass. The non-linear forced deflection shapes and their corresponding curvatures are presented for different magnitudes of the attached mass, different excitation levels and different vibration amplitudes.
Źródło:
Diagnostyka; 2020, 21, 4; 23-33
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
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:
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:
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:
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:
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:
Dynamic displacement analysis of reinforced concrete deep beams made of high strength concrete. Part II, Dynamic displacement analysis of reinforced concrete deep beams made of high strength C200 grade concrete
Analiza dynamicznego przemieszczenia tarcz żelbetowych z betonu wysokiej wytrzymałości. Cz. 2, Analiza dynamicznego przemieszczenia tarczy żelbetowej z betonu wysokiej wytrzymałości klasy C200
Autorzy:
Cichorski, W.
Powiązania:
https://bibliotekanauki.pl/articles/208481.pdf
Data publikacji:
2018
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
mechanika konstrukcji
konstrukcje żelbetowe
tarcze
obciążenie dynamiczne
nieliniowość fizyczna
mechanics of structures
reinforced concrete structures
deep beams
dynamic load
physical non-linearity
Opis:
The dynamic load displacements were analysed of rectangular concrete deep beams made of very high strength concrete, grade C200, including an evaluation of the physical non-linearity of the construction materials: concrete and reinforcing steel. The analysis was conducted using the method presented in [1]. The numerical calculation results are presented with particular reference to the displacement state of rectangular concrete deep beams. A comparative analysis was conducted on the effect of the high-strength concrete and the steel of increased strength on a class C200 concrete deep beam versus the results produced in [10] for a class C100 concrete deep beam.
W pracy przedstawiono analizę stanu przemieszczenia prostokątnych tarcz żelbetowych wykonanych z betonu bardzo wysokiej wytrzymałości klasy C200 obciążonych dynamicznie z uwzględnieniem fizycznych nieliniowości materiałów konstrukcyjnych: betonu i stali zbrojeniowej. Analiza została przeprowadzona na podstawie metody zaprezentowanej w pracy [1]. Przedstawiono wyniki rozwiązań numerycznych ze szczególnym uwzględnieniem stanu przemieszczenia tarczy. Przeprowadzono analizę porównawczą wpływu betonu wysokiej wytrzymałości i stali podwyższonej wytrzymałości na tarczy poprzez porównanie uzyskanych wyników dla tarczy z betonu klasy C200 z wynikami uzyskanymi dla tarczy żelbetowej wykonanej z betonu klasy C100 zamieszczonymi w pracy [10].
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2018, 67, 2; 27-50
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
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:
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:
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:
Hybridisation of Mel Frequency Cepstral Coefficient and Higher Order Spectral Features for Musical Instruments Classification
Autorzy:
Bhalke, D. G.
Rama Rao, C. B.
Bormane, D.
Powiązania:
https://bibliotekanauki.pl/articles/176497.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
feature extraction
MFCC
HOS
bispectrum
bicoherence
non-linearity
non-Gaussianity
CPNN
zero crossing rate (ZCR)
Opis:
This paper presents the classification of musical instruments using Mel Frequency Cepstral Coefficients (MFCC) and Higher Order Spectral features. MFCC, cepstral, temporal, spectral, and timbral features have been widely used in the task of musical instrument classification. As music sound signal is generated using non-linear dynamics, non-linearity and non-Gaussianity of the musical instruments are important features which have not been considered in the past. In this paper, hybridisation of MFCC and Higher Order Spectral (HOS) based features have been used in the task of musical instrument classification. HOS-based features have been used to provide instrument specific information such as non-Gaussianity and non-linearity of the musical instruments. The extracted features have been presented to Counter Propagation Neural Network (CPNN) to identify the instruments and their family. For experimentation, isolated sounds of 19 musical instruments have been used from McGill University Master Sample (MUMS) sound database. The proposed features show the significant improvement in the classification accuracy of the system.
Źródło:
Archives of Acoustics; 2016, 41, 3; 427-436
0137-5075
Pojawia się w:
Archives of Acoustics
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:
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:
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
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