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Tytuł:
Diffraction of sound pulses on a spherical target in an oceanic waveguide covered with ice
Autorzy:
Grigorieva, N.
Kupriyanov, M.
Ostrovskiy, D.
Stepanova, D.
Powiązania:
https://bibliotekanauki.pl/articles/332177.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
diffraction of acoustic waves
ice-covered homogeneous waveguide
normal modes of the waveguide
pulse with a Gaussian envelope
surface waves
Franz type
Whispering Gallery type
Opis:
This paper is devoted to modeling of the pulse scattering by a spherical target immersed in a homogeneous waveguide covered with ice. For calculating the echo signal in the frequency domain we have followed Hackman and Sammelmann’s general approach. The arising scattering coefficients of a sphere were evaluated with the use of the normal mode method. The amount of normal modes forming the backscattered field is determined by the given directivity of the source. The emitted signal is a pulse with a Gaussian envelope. Computational results are obtained in a wide frequency range 8 - 12 kHz for water depths equal to several hundreds of m, and distances between the source/receiver and a target from 1 km up to 10 km. The target is assumed to be acoustically rigid or fluid. In particular, the properties of the ice cover and a scatterer may coincide.
Źródło:
Hydroacoustics; 2016, 19; 139-144
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of the FKT system with different mooring lines
Autorzy:
Wu, Jo-Ti
Chen, Jiahn-Horng
Hsin, Ching-Yeh
Chiu, Forng-Chen
Powiązania:
https://bibliotekanauki.pl/articles/258986.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ocean current energy
floating turbine system
mooring line
system dynamics
surface waves
Opis:
To harness the endless hydrokinetic energy of the Kuroshio current, the joint research team of the National Taiwan University and the National Taiwan Ocean University has developed a floating Kuroshio turbine (FKT) system in Taiwan. In normal operation, the system floats at a certain small depth from the ocean surface to reduce the wave effects and take advantage of faster current speeds. In the present study, the effect of the mooring line on the system dynamics is investigated computationally. Two different auxiliary mooring line designs and, for each design, three different common mooring lines (polyester ropes of neutral buoyancy, iron chains, and 6×19 wires ropes with wire core) are examined. The study makes use of several commercial and in-house packages, integrated to find various coefficients. It is found that the mooring line, the auxiliary mooring line design, and the gravity centre can have a significant effect on system fluctuations in normal operation if the combination of these factors is not properly matched.
Źródło:
Polish Maritime Research; 2019, 1; 20-29
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flow-induced Vibrations of a Horizontal Elastic Band Plate Submerged in Fluid of Finite Depth
Autorzy:
Szmidt, Kazimierz
Hedzielski, Benedykt
Powiązania:
https://bibliotekanauki.pl/articles/241049.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
elastic plate vibrations
surface waves
initial value problem
coupled problem
Opis:
The paper deals with forced vibrations of a horizontal thin elastic plate submerged in a semi-infinite layer of fluid of constant depth. The pressure load on this plate is induced by water waves arriving at the plate. This load is accompanied by pressure resulting from the motion of the plate. The plate and fluid motions depend on boundary conditions, and, in particular, the pressure load depends on the width of the gap between the plate and the bottom. In theoretical description of the phenomenon, we deal with a coupled problem of hydrodynamics in which the plate and fluid motions are coupled through boundary conditions at the plate surfaces. The main attention is focused on transient solutions of the problem, which correspond to fluid (and plate) motion starting from rest. In formulation of this problem, a linear theory of small deflections of the plate is employed. In order to calculate the fluid pressure, a solution of Laplace’s equation is constructed in a doubly connected fluid domain. With respect to the initial value problem considered, we confine our attention to a finite fluid domain. For a finite elapse of time, measured from the starting point, the solution in the finite fluid area mimics a solution within an infinite domain, inherent for wave propagation problems. Because of the complicated structure of boundary conditions of the coupled problem considered, the fluid domain is divided into sub-domains of simple geometry, and the solutions of the problem equations are constructed separately in each of these domains. Numerical experiments have been conducted to illustrate the formulation developed in this paper.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2019, 66, 3-4; 101-130
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geological and seismic investigation of former lignite mining area in Zielona Góra – two case studies
Badania geologiczno–inżynierskie oraz sejsmiczne na obszarach dawnego górnictwa węgla brunatnego – dwa przypadki z terenu Zielonej Góry
Autorzy:
Gontaszewska-Piekarz, A.
Kłosiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/105324.pdf
Data publikacji:
2017
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
lignite mining
Zielona Góra
seismic investigation
multichannel analysis
surface waves
MASW
seismic estimation SPT
górnictwo węgla brunatnego
badania sejsmiczne
wielokanałowa analiza fal powierzchniowych
estymacja sejsmiczna SPT
Opis:
The article presents two case studies of investigation carried out on plots of land, intended for multi-family residential development, lying on a former lignite mining area in Zielona Gora. It was underground mining, operating in the years 1840- 1948. Lignite deposits were extracted with the room and pillar method, i.e. with an overlayer collapse, causing deformations on the surface of the ground. In the first case study, there was no detailed mining data. In order to identify the geological structure under the planned seven-floor multi-family building, seismic surveys were performed with the technique of multichannel analysis of surface waves (MASW). Three seismic profiles were performed. They revealed the presence of several zones where S-waves had smaller velocity values. In order to verify whether the zones with the smaller values of velocity correspond to e.g. lower soil density resulting from collapsed exploitation room, some drillings were undertaken to the depth indicated in geophysical investigation. Additionally, the CPT and dynamic probing were also performed. The data obtained allowed to determine the soil parameters necessary for the safe design and foundation of the building. In the second case study, a historical mining map with the marked location of the shaft and the main galleries was used. Formerly, geological and engineering documentation for construction works had been prepared, based on 30-meter drillings and soundings with a heavy probe. The mining maps and the contemporary maps were mapped one on another carefully and accurately, calibrated with historic buildings. Thus, the accuracy of 5 m was obtained. Additionally, investigation with the MASW technique was performed. Ten seismic profiles were performed, and then verified by drillings. Also, dynamic probing in the vicinity of the expected location of the shaft was performed. Neither the MASW investigation nor the dynamic probing did not reveal any alterations in the soil condition, which would suggest the presence of the properly liquidated shaft. Thus, based exclusively on the cartographic material, the area comprising the liquidated and backfilled shaft was established. The area was excluded from the plans for the intended building erection.
Artykuł przedstawia badania, jakie przeprowadzono na dwóch przykładowych działkach przeznaczonych dla zabudowy wielorodzinnej leżących na terenie dawnego górnictwa węgla brunatnego w Zielonej Górze. Było to górnictwo podziemne, działające w latach 1840-1948. Węgiel 326 A. Gontaszewska-Piekarz, J. Kłosiński brunatny eksploatowany był metodą filarowo – komorową, na zawał, powodując powstawania na powierzchni deformacji terenu. Dla niektórych fragmentów miasta zachowały się mapy górnicze. W pierwszym przypadku brak było szczegółowych danych górniczych. W celu rozpoznania budowy geologicznej pod projektowany budynek wielorodzinny, 7-kondygnacyjny wykonano geofizyczne badania sejsmiczne techniką wielokanałowej analizy fal powierzchniowych MASW. Wykonano 3 profile sejsmiczne. Wykazały one kilka niewielkich stref cechujących się niższymi wartościami prędkości fal sejsmicznych poprzecznych S. W celu weryfikacji, czy strefy obniżeń prędkości związane są np. z obniżonym zagęszczeniem gruntu wskutek zawału stropu nad komorami eksploatacyjnymi wykonano odwierty do głębokości wskazanej badaniami geofizycznymi. Wykonano także sondowania sondą CPTu oraz sondowania dynamiczne. Uzyskane dane pozwoliły na określenie parametrów podłoża koniecznych do bezpiecznego zaprojektowania posadowienia budynku. W drugim przypadku dostępna była mapa górnicza z lokalizacją szybu oraz głównych chodników.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2017, 64, 2/I; 311-326
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Group and Phase Velocity of Love Waves Propagating in Elastic Functionally Graded Materials
Autorzy:
Kiełczyński, P.
Szalewski, M.
Balcerzak, A.
Wieja, K.
Powiązania:
https://bibliotekanauki.pl/articles/177447.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface Love waves
group velocity
phase velocity
functionally graded materials
profiles of elastic constants
direct Sturm-Liouville problem
Opis:
This paper presents a theoretical study of the propagation behaviour of surface Love waves in nonhomogeneous functionally graded elastic materials, which is a vital problem in acoustics. The elastic properties (shear modulus) of a semi-infinite elastic half-space vary monotonically with the depth (distance from the surface of the material). Two Love wave waveguide structures are analyzed: 1) a nonhomogeneous elastic surface layer deposited on a homogeneous elastic substrate, and 2) a semi-infinite nonhomogeneous elastic half-space. The Direct Sturm-Liouville Problem that describes the propagation of Love waves in nonhomogeneous elastic functionally graded materials is formulated and solved 1) analytically in the case of the step profile, exponential profile and 1cosh2 type profile, and 2) numerically in the case of the power type profiles (i.e. linear and quadratic), by using two numerical methods: i.e. a) Finite Difference Method, and b) Haskell-Thompson Transfer Matrix Method. The dispersion curves of phase and group velocity of surface Love waves in inhomogeneous elastic graded materials are evaluated. The integral formula for the group velocity of Love waves in nonhomogeneous elastic graded materials has been established. The results obtained in this paper can give a deeper insight into the nature of Love waves propagation in elastic nonhomogeneous functionally graded materials.
Źródło:
Archives of Acoustics; 2015, 40, 2; 273-281
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guided circumferential waves in layered poroelastic cylinders
Autorzy:
Shah, S. A.
Apsar, G.
Powiązania:
https://bibliotekanauki.pl/articles/265282.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
teoria Biota
fala obwodowa
wał
łożysko
frequency
wave number
impermeable surface
borepiston assembly
shaft-bearing assembly
circumferential waves
poroelastic layered cylinder
Biot’s theory
Opis:
The present paper investigates the propagation of time harmonic circumferential waves in a two-dimensional hollow poroelastic cylinder with an inner shaft (shaft-bearing assembly). The hollow poroelastic cylinder and inner shaft are assumed to be infinite in axial direction. The outer surface of the cylinder is stress free and at the interface, between the inner shaft and the outer cylinder, it is assumed to be free sliding and the interfacial shear stresses are zero, also the normal stress and radial displacements are continuous. The frequency equation of guided circumferential waves for a permeable and an impermeable surface is obtained. When the angular wave number vanish the frequency equation of guided circumferential waves for a permeable and an impermeable surface degenerates and the dilatational and shear waves are uncoupled. Shear waves are independent of the nature of surface. The frequency equation of a permeable and an impermeable surface for bore-piston assembly is obtained as a particular case of the model under consideration when the outer radius of the hollow poroelastic cylinder tends to infinity. Results of previous studies are obtained as a particular case of the present study. Nondimensional frequency as a function of wave number is presented graphically for two types of models and discussed. Numerical results show that, in general, the first modes are linear for permeable and impermeable surfaces and the frequency of a permeable surface is more than that of an impermeable surface.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 4; 933-950
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of internal and surface waves in a two-layer fluid with free surface
Autorzy:
Naradovy, V.
Powiązania:
https://bibliotekanauki.pl/articles/115568.pdf
Data publikacji:
2013
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
internal waves
surface waves
fluid layer
multiple scales
stability
Opis:
The interaction of internal and surface waves in a two-layer fluid with free surface has been considered. The stability of wave packets propagation on the contact surface and free surface of hydrodynamic system „layer with rigid bottom - layer with free surface” was investigated. The amplitudes of the second harmonics of the elevations of the contact surface and the free surface are investigated.
Źródło:
Challenges of Modern Technology; 2013, 4, 3; 3-9
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of signals of the range 10-3 - 10-4 Hz registered by water-tube tiltmeters in the underground geodynamic laboratory in Książ (SW Poland)
Autorzy:
Kaczorowski, Marek
Kasza, Damian
Zdunek, Ryszard
Wronowski, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2174941.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
Tematy:
interferometry
time series analysis
tides
planetary waves
acoustic gravity waves
surface waves
free oscillations
ionosphere interactions
atmosphere interactions
Opis:
The Geodynamic Laboratory in Książ includes investigations of various kinds of geodynamic signals. Among others, we registered harmonic signals of the range 10-3 - 10-4 Hz. These signals had been found in the measurement series of the long water-tube (WT) tiltmeters. The discovered signals consist of two classes of harmonics associated with various kinds of phenomena. The first class of these signals belongs to viscoelastic vibrations of the Earth’s solid body, while the second class is produced possibly by the extremely long atmospheric infrasound waves. The signals of the vibrations of the Earth had been well recognized by the characteristic frequencies of the Earth’s free vibrations’ resonance, which occur mainly after strong earthquakes. The atmospheric pressure microvibrations affected the water level in the hydrodynamic systems of the WTs as a result of an inverse barometric effect. We observed that signals from both classes blend in the harmonics of similar frequencies and jointly affect the hydrodynamic systems of the WTs. We found that the amplitude of the secondclass signals strongly depends on the location of water-tube gauges inside the underground, while the amplitudes of the first-class signals are similar for all the gauges. These observations clearly indicate the atmospheric origin of the second class of registered signals.
Źródło:
Artificial Satellites. Journal of Planetary Geodesy; 2022, 57, 4; 210--236
2083-6104
Pojawia się w:
Artificial Satellites. Journal of Planetary Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear and nonlinear ΤM polarized surface waves in anisotropic metamaterials
Autorzy:
Ali, Munazza Zulfiqar
Powiązania:
https://bibliotekanauki.pl/articles/173995.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
anisotropic metamaterials
surface plasmons
nonlinear waves
Opis:
The metamaterial with an effective permeability and/or permittivity tensor having elements of different magnitudes and signs is termed as the anisotropic metamaterial. The hyperbolic metamaterial may be considered as a subclass of the anisotropic metamaterial. The dispersion relation for the transverse magnetic surface waves at the interface between a nonlinear dielectric material and an anisotropic metamaterial is derived using the parallel uniaxial approximation of the permittivity tensor. This dispersion relations can be linearized by taking the nonlinear coefficient to be zero. Dispersion curves are plotted for both the linear and the nonlinear cases and are analyzed and compared in different frequency regions.
Źródło:
Optica Applicata; 2019, 49, 3; 473-486
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modeling of torsional surface wave propagation in a non-homogeneous transverse isotropic elastic solid semi-infinite medium under a layer
Autorzy:
Sethi, M.
Sharma, A.
Vasishth, A.
Powiązania:
https://bibliotekanauki.pl/articles/265089.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
non-homogeneous media
torsional surface waves
rigidity
fala powierzchniowa
propagacja fal
modelowanie matematyczne
Opis:
The present paper deals with the mathematical modeling of the propagation of torsional surface waves in a non-homogeneous transverse isotropic elastic half-space under a rigid layer. Both rigidities and density of the half-space are assumed to vary inversely linearly with depth. Separation of variable method has been used to get the analytical solutions for the dispersion equation of the torsional surface waves. Also, the effects of nonhomogeneities on the phase velocity of torsional surface waves have been shown graphically. Also, dispersion equations have been derived for some particular cases, which are in complete agreement with some classical results.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 415-426
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements and numerical modelling of surface waves in front of the port of split
Autorzy:
Leder, N.
Duplančić Leder, T.
Lončar, G.
Powiązania:
https://bibliotekanauki.pl/articles/116487.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
activities in port area
numerical modelling
surface waves
port of split
Bracki Kanal Channel
Adriatic Sea
Aladin-CRO Model
sirocco
Opis:
Wind generated surface waves were measured at V2 station (φ=43°29.3’ N; λ=16° 27.9’ E) in the Brački Kanal Channel area of the Middle Adriatic, in front of the port of Split. This was undertaken in the time interval from November 2007 to June 2008, by using Datawell MKIII waverider with all its compo-nents. For the analysis and description of extreme sea states maximum recorded wave height Hmax and sig-nificant wave height H1/3 were presented as well as associated wave spectra. The measurement results show that much larger waves appear in the open Adriatic compared to the Middle Adriatic channel area. Numerical modelling of wave generation in the Brački Kanal Channel area and wider island area of the Middle Adriatic Sea was performed by using Mike 21/SW numerical model. Wind field used for the forcing in numerical simulations relies on the results of the prognostic atmospheric model Aladin-CRO. For verification of model results, results of measurement at a waverider station V2 located in front of the port of Split were used. It was concluded that measured and modelled significant wave heights were very well matched.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 1; 191-197
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Surface-Plasmon-Polariton-Like Acoustic Surface Waves at the Interface Between Two Semi-Infinite Media
Autorzy:
Kiełczyński, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/31340115.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
shear horizontal acoustic waves
surface plasmon polaritons
phase velocity
group velocity
Poynting vector
Opis:
This paper presents theory of new shear horizontal (SH) acoustic surface waves that propagate along the interface of two semi-infinite elastic half-spaces, one of which is a conventional elastic medium and a second one an elastic metamaterial with a negative and frequency dependent shear elastic compliance. This new surface waves have only one transverse component of mechanical displacement, which has a maximum at the interface and decays exponentially with distance from the interface. Similar features are also shown by the acoustic shear horizontal Maerfeld-Tournois surface waves propagating at the interface of two semi-infinite elastic media due to the piezoelectric effect that should occur in at least one semi-space. The proposed new shear horizontal acoustic surface waves exhibit also strong formal similarities with the electromagnetic surface waves of the surface plasmon polariton (SPP) type, propagating along a metal-dielectric planar interface. In fact, the new shear horizontal elastic surface waves possess a large number of properties that are inherent for the SPP electromagnetic surface waves, such as strong subwavelength concentration of the wave field in the proximity of the guiding interface, low phase and group velocity etc. As a result, the new shear horizontal acoustic surface waves can find applications in sensors with extremely high sensitivity, employed in measurements of various physical parameters, such as viscosity of liquids, as well as in biosensors, chemosensors, or a near field acoustic microscopy (subwavelength imaging) and miniaturized devices of microwave acoustics.
Źródło:
Archives of Acoustics; 2022, 47, 3; 363-371
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear surface elastic waves in materials
Autorzy:
Rushchitsky, J.
Powiązania:
https://bibliotekanauki.pl/articles/128024.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
surface nonlinear elastic harmonic waves
Rayleigh wave
Love wave
Stoneley wave
Mozhaev wave
fale powierzchniowe
fale nieliniowe
fale harmoniczne
fale sprężyste
fala Rayleigha
fala Love'a
fala Stoneley'a
fala Mozhaeva
Opis:
This paper is devoted to analysis of the surface nonlinear elastic harmonic waves of four types (Rayleigh and Stoneley harmonic waves within the framework of plane strain state; Love and Mozhaev harmonic wave within the framework of anti-plane strain state). The nonlinear model is based on introducing the Murnaghan elastic potential, which includes both geometrical and physical nonlinearities. Each type of surface waves is discussed in four steps: statement of the problem, nonlinear wave equations, approximate solution (first two approximations), so-me conclusions. A nonlinear analysis of waves required many novelties: new variants of the Murnaghan potential, new nonlinear wave equations and new nonlinear boundary conditions. The nonlinear wave equations were solved by the method of successive approximations. A new approach to analyze the boundary conditions is offered. Some new nonlinear wave effects are observed theoretically: a wave picture is reached by the 2nd harmonic and becomes changing in time of propagation, the wave numbers become depending on the initial amplitude.
Źródło:
Vibrations in Physical Systems; 2014, 26; 33-40
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear traveling waves in a thin layer composed of the Mooney-Rivlin material
Nieliniowe fale biegnące w cienkiej warstwie wykonanej z materiału Mooneya-Rivlina
Autorzy:
Major, M.
Major, I.
Powiązania:
https://bibliotekanauki.pl/articles/281436.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
discontinuous surface
traveling waves
hyperelastic materials
phase plane
Opis:
In this paper the problem of studies nonlinear traveling waves in the Mooney-Rivlin elastic layer is studied. By averaging the equations of motions over the width of the layer we obtain a system of partial differential equations in one dimensional space and time. A technique of phase planes is used to study the waves processes. Based on the phase trajectory method, we can make an interpretation of conditions of propagation of nonlinear traveling waves and can establish the existence conditions under which the phase plane contains physically acceptable solutions.
Referat dotyczy propagacji nieliniowej fali biegnącej w cienkiej sprężystej warstwie wykonanej z materiału Mooneya-Rivlina. Dla przybliżonego rozwiązania zagadnieni propagacji fali biegnącej w warstwie hipersprężystej zastosowano metodę polegając na uśrednieniu równań ruchu w przekroju poprzecznym warstwy przy założeniu, że uśrednione wielkości spełniają równania ruchu i warunki brzegowe. Otrzymane w te sposób równania zastosowano do opisu procesów falowych dla rozpatrywanych w pracy fal biegnących. Do analizy procesów falowych użyta została technika płaszczyzny fazowej. W oparciu o metodę trajektorii fazowej zinterpretowano warunki propagacji nieliniowej fali oraz ustalono warunki istnienia fizycznie akceptowalnych rozwiązań.
Źródło:
Journal of Theoretical and Applied Mechanics; 2007, 45, 2; 259-275
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and Experimental Analysis of the Response of a SAW Structure with WO3 Layers on Action of Carbon Monoxide
Autorzy:
Hejczyk, T.
Urbańczyk, M.
Pustelny, T.
Jakubik, W.
Powiązania:
https://bibliotekanauki.pl/articles/176885.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas sensor
carbon monoxide (CO)
piezoelectric substrate
numerical modeling
surface acoustic waves
acoustoelectric effects
Ingebrigtsen's formula
Opis:
The paper presents the results of an analysis of gaseous sensors based on a surface acoustic wave (SAW) by means of the equivalent model theory. The applied theory analyzes the response of the SAW sensor in the steady state affected by carbon monoxide (CO) in air. A thin layer of WO3 has been used as a sensor layer. The acoustical replacing impedance of the sensor layer was used, which takes into account the profile of the concentration of gas molecules in the layer. Thanks to implementing the Ingebrigtsen equation, the authors determined analytical expressions for the relative changes of the velocity of the surface acoustic wave in the steady state. The results of the analysis have shown that there is an optimum thickness of the layer of CO sensor at which the acoustoelectric effect (manifested here as a change in the acoustic wave velocity) is at its highest. The theoretical results were verified and confirmed experimentally.
Źródło:
Archives of Acoustics; 2015, 40, 1; 19-24
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 36

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