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Tytuł:
Numerical study of wave transmission over double submerged breakwaters using non-hydrostatic wave model
Autorzy:
Liang, B.
Wu, G.
Liu, F.
Fan, H.
Li, H.
Powiązania:
https://bibliotekanauki.pl/articles/48006.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
submerged breakwater
wave transmission
numerical result
physical model
Źródło:
Oceanologia; 2015, 57, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie sztywności koła podatnego przekładni falowej
The modelling of stiffness of harmonic drive flexspline
Autorzy:
Folęga, P.
Wojnar, G.
Powiązania:
https://bibliotekanauki.pl/articles/196774.pdf
Data publikacji:
2010
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
modelowanie dynamiczne
przekładnia falowa
układ napędowy
dynamic modeling
wave transmission
drive system
Opis:
W artykule omówiono niektóre aspekty modelowania dynamicznego przekładni falowej. W szczególności zaproponowano nowy, oryginalny model dynamiczny przekładni falowej w układzie napędowym. W modelu uwzględniono nieliniowe zmiany sztywności i tłumienia.
In the paper some aspects of harmonic drive gear modeling of dynamic are consider. At particular of the propose a new original dynamic model of harmonic drive gear in power trans-mission system. In the model we take into consideration a nonlinear stiffness and damping.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2010, 67; 39-44
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Interaction of Ultrasonic and Optical Wave in Optical Fiber Using the Air Gap
Autorzy:
Gudra, T.
Muc, S.
Powiązania:
https://bibliotekanauki.pl/articles/177005.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transmission of acoustic wave
transmission of optical wave
optical fiber
air gap
Opis:
There exist some possibilities for simultaneous delivery of laser radiation and ultrasounds of low frequency and high intensity: introducing ultrasound oscillations in the optical fiber by the rigid connection of the fiber to the vibrating element and non-contact influence of the ultrasonic wave on the laser beam. The article presents the results of Matlab simulations and experimental studies of influence of the ultrasonic wave on the laser beam. A role of the air gap, and its influence on laser- ultrasonic transmission in optical fiber was examined. Advantages and disadvantages of both solutions of interaction of ultrasonic and optical waves in, e.g., surgical applications are discussed.
Źródło:
Archives of Acoustics; 2011, 36, 3; 613-628
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyznaczanie luzu obwodowego w zazębieniu kół przekładni falowej
Calculation method of side backlash in meshing gears of a harmonic gear
Autorzy:
Kalina, A.
Mazurkow, A.
Warchoł, S
Powiązania:
https://bibliotekanauki.pl/articles/195689.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
przekładnia falowa
zazębienie
koło sztywne
koło podatne
luz obwodowy
wave transmission
meshing
rigid wheel
flexible wheel
circumferential play
Opis:
W pracy przedstawiono metodę wyznaczania luzu obwodowego dla przyjętego zarysu ewolwentowego koła podatnego i sztywnego przekładni falowej. W pierwszej części pracy scharakteryzowano parametry geometryczne przekładni. Następnie dla współpracujących kół zębatych zdefiniowano luz obwodowy, przedstawiono założenia do modelu matematycznego wyznaczania luzu obwodowego, omówiono algorytm metody rozwiązania równań modelu matematycznego. We wnioskach zawarto wyniki badań symulacyjnych. Opracowana metoda zostanie wykorzystana w dalszych badaniach do określenia w strefie kontaktu zazębiających się kół rozkładu nacisków i odkształceń.
The article contains information about the calculation method of side backlash for harmonic gear with involute profile. The first part of the paper contains a description of main geometric parameters of this kind of gear. After that a definition of side backlashes was defined with the main foundations of mathematical model of the method with algorithm. The summary contains conclusions. The presented method will be used in further research of tooth contact.
Źródło:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2018, z. 90 [298], 4; 481-489
0209-2689
2300-5211
Pojawia się w:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmission of Ultrasonic Waves Via Optical Silica Glass Fiber Doped by 7.5% of TiO2 with the Use of Power Sandwich Transducer
Autorzy:
Muc, S.
Gudra, T.
Powiązania:
https://bibliotekanauki.pl/articles/177364.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasounds
transmission of acoustic wave in an optical waveguide
Opis:
The possibility of acoustic wave propagation in optical waveguides creates new prospects for simultaneous transmission of laser beams and ultrasonic waves. Combined laser-ultrasonic technology could be useful in e.g. surgical treatment. The article presents the results of experimental studies of transmission of ultrasonic wave in optical fibres, the core of which is doped by 7.5% of TiO2, using a sandwichtype transducer. It also presents amplitude characteristics of an ultrasonic signal propagated in the optical fibre. Authors studied the effect which the length of the fibre has on the achieved output signal amplitudes. They presented the relation of the output signal amplitude from a capacitive sensor to the power applied to the sandwich-type transducer. The obtained results were compared with the results produced when using an optical fibre with a core doped by 3% of GeO2, in order to select optical fibre suitable for simultaneous transmission of ultrasonic waves and laser rays.
Źródło:
Archives of Acoustics; 2011, 36, 1; 141-150
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D Modeling of Wave Propagation in Shallow Water by the Method of Characteristics
Autorzy:
Khalilabadi, Mohammad Reza
Powiązania:
https://bibliotekanauki.pl/articles/31340098.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
wave propagation
shallow water
MOC method
waveguide
transmission loss
Opis:
In this paper, a 2D numerical modeling of sound wave propagation in a shallow water medium that acts as a waveguide, are presented. This modeling is based on the method of characteristic which is not constrained by the Courant–Friedrichs–Lewy (CFL) condition. Using this method, the Euler time-dependent equations have been solved under adiabatic conditions inside of a shallow water waveguide which is consists of one homogeneous environment of water over a rigid bed. In this work, the stability and precision of the method of characteristics (MOC) technique for sound wave propagation in a waveguide were illustrated when it was applied with the semi-Lagrange method. The results show a significant advantage of the method of characteristics over the finite difference time domain (FDTD) method.
Źródło:
Archives of Acoustics; 2022, 47, 3; 407-412
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Installation for Concentrated Uniform Heating of Objects by Microwave Radiation
Autorzy:
Cieslik, Jacek
Kismereshkin, Vladimir
Ritter, Ekaterina
Savostin, Alexey
Ritter, Dmitry
Nabiyev, Nabi
Powiązania:
https://bibliotekanauki.pl/articles/226066.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
single-wire transmission line
microwave radiation
excitement of a surface wave
wave guides
vibrator
reflector
Opis:
A design of microwave installation for energy concentration on a surface of a heated object is proposed. In the installation a dipole lattice on the basis of a single-wire transmission line is used which is located inside of reflector in a form of specular parabolic conducting cylinder. The heated object is placed in the area of microwave energy concentration. In the article a waveguide field of a surface wave in a reradiation mode is explored. The surface wave is reradiated by a group of vibrators coaxial with the waveguide wire. Results of experimental studies of field distribution along the waveguide operating in various modes are presented. The possibility of efficiency increase in reradiated field and its adjustment by contactless movement of reflector is shown.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 2; 295-300
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of hydraulic response of smooth submerged breakwaters to irregular waves
Autorzy:
Mahmoudof, S.M.
Hajivalie, F.
Powiązania:
https://bibliotekanauki.pl/articles/2078821.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
submerged breakwater
irregular wave
experimental study
transmission
reflection
coastal area
Opis:
This paper presents the results of a laboratory experiment on transmission, reflection, and dissipation of irregular waves over smooth impermeable submerged breakwaters. Experiments included 75 JONSWAP-based irregular waves with five different wave characteristics generated at three water depths in a 2D wave flume. The investigated breakwater sections were three rectangular breakwaters with different widths, a toothed rectangular breakwater, and a trapezoidal breakwater with a slope of 1:2. A new comprehensive dimensionless parameter (β) was proposed representing both wave hydrodynamic and breakwater geometry characteristics. This parameter could be employed as a suitable descriptive option to make an accurate estimate of the hydraulic performances of submerged breakwaters. The β parameter is composed of four conventional simple dimensionless variables. However, the results revealed that the relative submergence depth significantly affects the hydraulic responses of submerged breakwaters. The transmission, reflection and dissipation of waves show a logarithmic growth, a logarithmic reduction, and a quadratic decreasing trend against the increasing of β parameter, respectively. The verifications of results revealed the high efficiency of β parameter for data reported by Carevic et al. (2013) with R2 = 0.88 and high agreement with predictions made by Van der Meer et al. (2005) formulation with R2 = 0.93.
Źródło:
Oceanologia; 2021, 63, 4; 448-462
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection and Transmission of Plane Wave at an Interface Between Two Rotating Micropolar Piezoelectric Solid Half-Spaces
Autorzy:
Singh, Baljeet
Sangwan, Asha
Singh, Jagdish
Powiązania:
https://bibliotekanauki.pl/articles/2141703.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plane wave
micropolar piezoelectricity
reflection and transmission
amplitude ratios
energy ratios
rotation
Opis:
In this paper, we investigate a problem on reflection and transmission of plane-waves at an interface between two dissimilar half-spaces of a transversely isotropic micropolar piezoelectric material. The entire model is assumed to rotate with a uniform angular velocity. The governing equations of rotating and transversely isotropic micropolar piezoelectric medium are specialized in a plane. Plane-wave solutions of two-dimensional coupled governing equations show the possible propagation of three coupled plane-waves. For an incident plane-wave at an interface between two dissimilar half-spaces, three reflected and three transmitted waves propagate with distinct speeds. The connections between the amplitude ratios of reflected and transmitted waves are obtained. The expressions for the energy ratios of reflected and transmitted waves are also obtained. A numerical example of the present model is considered to illustrate the effects of rotation on the speeds and energy ratios graphically.
Źródło:
Archives of Acoustics; 2021, 46, 4; 623-635
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection and transmission at the boundary surface of modified couple stress thermoelastic media
Autorzy:
Kumar, R.
Kumar, K.
Powiązania:
https://bibliotekanauki.pl/articles/264443.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termoelastyczność
fala podłużna
fala poprzeczna
wskaźniki amplitudy
modified couple stress thermoelastic solid
longitudinal wave
transverse wave
reflection
transmission
amplitude ratios
Opis:
In this paper the reflection and transmission at a plane interface in modified couple stress generalized thermoelastic solid half spaces in the context of Loard-Shulman (LS) and Green-Lindsay (GL) theories in welded contact are investigated. Amplitude ratios of various reflected and transmitted waves are obtained due to incidence of a set of coupled longitudinal waves and coupled transverse waves. It is found that the amplitude ratios of various reflected and transmitted waves are functions of the angle of incidence, frequency and are affected by the couple stress properties of the media. Some special cases are deduced from the present formulation.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 61-81
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the transmission and the scattering matrix applicability to the mufflers analysis
Autorzy:
Snakowska, Anna
Gorazd, Łukasz
Jurkiewicz, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/127786.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
transmission matrix
scattering matrix
multimode wave
silencer
muffler
macierz transmisji
macierz S
fala wielomodowa
tłumik
Opis:
The analysis of the acoustical systems can be carried out based on a number of different formalisms, of which applied frequently are the transfer matrix formalism, in which the chosen state variables are the sound pressure p and the sound velocity v, and the scattering matrix formalism adopting the sound pressures p+ and p− and the sound velocities v+ and v− of waves propagating through an element in both directions. Even though, they are mathematically equivalent, i.e. there exists the unequivocal transformation from one to another there are some advantages and disadvantages in applying one or the other to analyse mufflers or other acoustic system, especially when the propagation of a multimode wave is assumed and numerical calculations are indispensable. In the paper the transformation between the formalisms has been derived and applied to analyse the phenomena at a junction between the tail pipe and the chamber and also in mufflers composed of one or two chambers. The more flexible for numerical calculations seems the scattering matrix formalism, especially when the number of propagating modes differs on both sides of a junction. On the other hand the transmission matrix formalism is suitable for analysing systems constituting a cascade. The sources of the advantages and disadvantages of both formalisms are explained. The results obtained can be helpful in the effective design of silencers with specific properties.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The reactance wave diffraction problem by a strip in a scale of Bessel potential spaces
Autorzy:
Castro, L. P.
Natroshvili, D.
Powiązania:
https://bibliotekanauki.pl/articles/255627.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Helmholtz equation
boundary-transmission problem
wave diffraction
convolution type operator
Wiener-Hopf operator
Fredholm property
factorization
Opis:
We consider a boundary-transmission problem for the Helmholtz equation, in a Bessel potential space setting, which arises within the context of wave diffraction theory. The boundary under consideration consists of a strip, and certain reactance conditions are assumed on it. Operator theoretical methods are used to deal with the problem and, as a consequence, several convolution type operators are constructed and associated to the problem. At the end, the well-posedness of the problem is shown for a range of regularity orders of the Bessel potential spaces, and for a set of possible reactance numbers (dependent on the wave number).
Źródło:
Opuscula Mathematica; 2006, 26, 2; 289-303
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In Keeping with Family Tradition: American Second-Wave Feminists and the Social Construction of Political Legacies
Autorzy:
Foster, Johanna E.
Powiązania:
https://bibliotekanauki.pl/articles/623481.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Identity Construction
Political Legacy
Intergenerational Transmission
American Feminism
U.S. Second-Wave Activists
Sociology of Ancestry
Opis:
Through an interpretive lens that borrows from feminist postmodernist perspectives on identity and cognitive sociology, the manuscript utilizes in-depth interview data from 33 women active in the American second-wave feminist movement to explore how aging feminist activists construct their current political identities in relation to the meanings they give to the perceived progressive political identities and actions of their elders. In particular, this study examines the discursive strategies that respondents engage as they link their own feminist consciousness directly or indirectly to feminist, or otherwise progressive, parents and grandparents. Findings reveal three distinct political legacy narratives, namely 1) explicit transmission origin stories; 2) bridge narratives; and 3) paradox plots that add to both the social movement literature on the symbolic dimensions of recruitment, sustainability, and spillover, as well as cognitive sociological literature on the cultural transmission of political capital, in general, and to our understanding of American second-wave activists, more specifically.
Źródło:
Qualitative Sociology Review; 2018, 14, 1; 6-28
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection and transmission in non-local couple stress micropolar thermoelastic media
Autorzy:
Gupta, Deepa
Malik, Sangeeta
Kumar, Krishan
Sharma, Raj Kumar
Powiązania:
https://bibliotekanauki.pl/articles/2174196.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termosprężystość
liczba falowa
para
non-local
thermoelastic solid
amplitude ratios
reflection
transmission
couple stress
wave number
Opis:
We have studied the problem of homogenous, isotropic non-local couple stress micropolar thermoelastic solid in the absence of body forces, couple density and heat resources. The reflection and transmission of waves at the interface of two distinct media have been investigated. It is observed that amplitude ratios of various reflected and transmitted waves are functions of wave number of incident waves and are affected by the non-local parameter of thermoelastic solid.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 53--76
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method of precise pulse onset determination using the Akaike Information Criterion for Ultrasound Transmission Tomography
Autorzy:
Pruchnicki, Piotr
Opieliński, Krzysztof J.
Powiązania:
https://bibliotekanauki.pl/articles/2146650.pdf
Data publikacji:
2021
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
Akaike Information Criterion
AIC
pulse wave
transmission method
ultrasound tomography
kryterium informacyjne Akaike
fala tętna
metoda transmisyjna
tomografia ultradźwiękowa
Opis:
Information criteria used in statistics for model selection can be used to accurately determine pulse transition times in transmission methods. The most popular information criteria are the Akaike Information Criterion (AIC) and the Bayesian Schwartz Criterion (BIC). These criteria are considered the most reliable tests of model type and structure and are computationally simple. In this paper, an algorithm developed according to the AIC criterion is used to determine the transition time from transmission tomography measurements acquired with a multi-element ultrasonic ring array, which is the scanning element of the novel prototype of ultrasound tomography device for detecting and estimating the malignancy of female breast cancer in vivo. As a result, a new algorithm was developed to precise search for the onset of the recorded receiving pulse. The algorithm was tested in an aqueous environment using elementary pairs of transmitting and receiving ultrasonic transducers of a tomographic ring array.
Źródło:
Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021115
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
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