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Wyświetlanie 1-15 z 50
Tytuł:
Existence and uniqueness of solutions to wave equations with nonlinear degenerate damping and source terms
Autorzy:
Barbu, V.
Lasiecka, I.
Rammaha, A.
Powiązania:
https://bibliotekanauki.pl/articles/970548.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
równanie falowe
rozwiązania słabe
wave equations
damping and source terms
weak solutions
subdifferential
blow-up of solutions
energy estimates
Opis:
In this article we focus on the global well-posedness of the differential equation u [...] in Omega x(O, T), where j' denotes the derivative of a C1 convex and real valued function j. The interaction between degenerate damping and a source term constitutes the main challenge of the problem. Problems with non-degenerate damping (k = 0) have been studied in the literature (Georgiev and Todorova, 1994; Levine and Serrin, 1997; Vitillaro, 2003). Thus the degeneracy of monotonicity is the main novelty of this work. Depending on the level of interaction between the source and the damping we characterize the domain of the parameters p, m, k, n (see below) for which one obt ains existence, regularity or finite time blow up of solutions. More specifically, when p [is less than or equal to] m + k global existence of generalized solutions in H1 x L2 is proved. For p > m + k, solutions blow up in a finite time. Higher energy solutions are studied as well. For H2 x H1 initial data we obtain both local and global solutions with the same regularity. Higher energy solutions are also proved to be unique.
Źródło:
Control and Cybernetics; 2005, 34, 3; 665-687
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of higher-level energy norms of strong solutions to a wave equation with localized nonlinear damping and a nonlinear source term
Autorzy:
Lasiecka, I.
Toundykov, D.
Powiązania:
https://bibliotekanauki.pl/articles/970252.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
wave equation
localized nonlinear damping
nonlinear source
stability
uniform boundedness
higher energy
strong solutions
Opis:
We derive global in time a priori bounds on higher-level energy norms of strong solutions to a semilinear wave equation: in particular, we prove that despite the influence of a nonlinear source, the evolution of a smooth initial state is globally bounded in the strong topology ∼ H2 x H1. And the bound is uniform with respect to the corresponding norm of the initial data. It is known that an m-accretive semigroup generator moriotoni-cally propagates smoothness of the initial condition; however, this result does not hold in general for Lipschitz perturbations of monotone systems where higher order Sobolev norms of the solution may blowup asymptotically as t → ∞. Due to nonlinearity of the system, the only a priori global-in-time bound that follows from classical methods is that on finite energy: ∼ H1 x L2. We show that under some correlation between growth rates of the damping and the source, the norms of topological order above the finite energy level remain globally bounded. Moreover, we also establish this result when damping exhibits sublinear or superlinear growth at the origin, or at infinity, which has immediate applications to asymptotic estimates on the decay rates of the finite energy. The approach presented in the paper is not specific to the wave equation, and can be extended to other hyperbolic systems: e.g. plate, Maxwell, and Schrodinger equations.
Źródło:
Control and Cybernetics; 2007, 36, 3; 681-710
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shallow-water wave energy dissipation in a multi-bar coastal zone
Autorzy:
Pruszak, Z.
Szmytkiewicz, P.
Ostrowski, R.
Skaja, M.
Szmytkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/47959.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
coastal region
energy dissipation
surf zone
Baltic Sea
wave parameter
wave motion
wave transformation
shallow water
coastal zone
offshore wave
Opis:
The paper presents the results of studies of wave transformation on a multi-bar cross-shore profile of the southern Baltic Sea. The field investigations of wave motion were carried out using an offshore wave buoy and string wave gauges at the IBW PAN Coastal Research Station, Lubiatowo (Poland). These experimental results were used to validate statistical relationships between characteristic wave parameters in the coastal region and to assess wave energy dissipation in the surf zone. Asimple model for calculating the residual nearshore wave energy is proposed and tested versus the data collected in situ.
Źródło:
Oceanologia; 2008, 50, 1; 43-58
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the composite-foam panels applied to protect pipelines against the blast wave
Autorzy:
Barnat, W.
Niezgoda, T.
Szurgott, P.
Panowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/238142.pdf
Data publikacji:
2009
Wydawca:
Instytut Technologii Bezpieczeństwa Moratex
Tematy:
odkształcenia energii
dynamika wybuchu
fala uderzeniowa
rurociąg
ochrona rurociągu przed falą uderzeniową
deformation energy
dynamics of outbreak
shock wave
protect pipelines
Źródło:
Techniczne Wyroby Włókiennicze; 2009, R. 17, nr 2/3, 2/3; 112-117
1230-7491
Pojawia się w:
Techniczne Wyroby Włókiennicze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability and correlations of shoreline and dunes on the Southern Baltic coast (CRS Lubiatowo, Poland)
Autorzy:
Pruszak, Z.
Ostrowski, R.
Schonhofer, J.
Powiązania:
https://bibliotekanauki.pl/articles/48165.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
variability
correlation
shoreline
dune
Baltic coast
Lubiatowo
Polska
field investigation
coastal zone
wave energy
Opis:
The paper analyses the results of field investigations into the evolution of the shoreline and dune toe positions in a multi-bar, dissipative coastal zone. The correlations between the changes in the shoreline and the dune toe range from −0.4 to 0.8. It is most often the case that the dune toe is stable while the shoreline moves. Consistent cross-shore migration is slightly more likely to happen than the divergent or convergent movements of both lines. Shoreline retreat and advance attain respective rates of 0.7 m day−1 and 0.4 m day−1. Deep-water wave energy of about 50 kJ m−1 constitutes the boundary between shore accumulation and erosion.
Źródło:
Oceanologia; 2011, 53, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic noise generation under plunging breaking waves
Autorzy:
Klusek, Z.
Lisimenka, A.
Powiązania:
https://bibliotekanauki.pl/articles/48445.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
wave breaking
acoustic noise
noise emission
energy dissipation
dynamic process
acoustic pressure
wave energy
temporal change
sound pressure
Źródło:
Oceanologia; 2013, 55, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ehksperimentalnye issledovanija teploobmena v ehlementakh termoakusticheskikh apparatov
Experimental studies of heat exchanges in the elements of thermoacoustic devices
Autorzy:
Korobko, V.
Moskovko, O.
Powiązania:
https://bibliotekanauki.pl/articles/78138.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
thermoacoustic device
heat transfer
energy
heat pump
acoustic wave
CFD modelling
experimental study
Opis:
This paper presents an analysis of the heat transfer processes characteristics between the elements of thermoacoustic heat machines (TAHM). The possible mechanisms these factors influence on the performance of TAHM is shown. The results of CFD simulation, physical experiments, and experimental plant schematic are shown.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 2
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planck scale potential associated with particles
Autorzy:
Bulathsinghala, D.L.
Gamalath, K.A.I.L.W.
Powiązania:
https://bibliotekanauki.pl/articles/412054.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Planck scale potential
mass-energy equivalence
charge-energy equivalence
energy-momentum relation
electromagnetic momentum
de-Broglie’s wave length
Opis:
As the particles originating from point-like entities are associated with infinite self energies, a postulate, that the scalar-potential associated with particles are bounded by a Planck scale potential is introduced. By defining the self energy of a particle, equivalences between charge-energy and mass-energy are obtained. The electromagnetic energy-momentum equation, de-Broglie’s electromagnetic wave-length and frequency for a charge particle in motion are presented resolving the “4/3” discrepancy. The non-covariance nature of the present classical electrodynamics is discussed and how the proposed postulate makes it a fully covariant theorem with the rest of the classical electrodynamics is presented. A way electromagnetic energy-momentum equation could potentially resolve the stability-problem of a charge particle is discussed and thereby a theoretical explanation to electron’s spin is presented.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 11; 54-64
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global solutions to the initial-boundary value problem for the quasilinear viscoelastic equation with a derivative nonlinearity
Autorzy:
Nakao, M.
Powiązania:
https://bibliotekanauki.pl/articles/255382.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
global solutions
energy decay
quasilinear wave equation
Kelvin-Voigt dissipation
derivative nonlinearity
Opis:
We prove the existence and uniqueness of a global decaying solution to the initial boundary value problem for the quasilinear wave equation with Kelvin-Voigt dissipation and a derivative nonlinearity. To derive the required estimates of the solutions we employ a ‘loan’ method and use a difference inequality on the energy.
Źródło:
Opuscula Mathematica; 2014, 34, 3; 569-590
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of interaction of disc wave generator with flexible gear of heavy loaded wave gearing
Issledovanie vzaimodejjstvija diskovogo generatora voln s gibkim kolesom tjazhelo nagruzhennojj volnovojj peredachi
Autorzy:
Strelnikov, V.
Sukov, M.
Strelnikov, J.
Powiązania:
https://bibliotekanauki.pl/articles/792481.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
wave generator
axial force
energy loss
heat extraction
flexible gear
elastic deformation
cylindrical shell
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy retrieval from sea waves
Autorzy:
Szelangiewicz, T.
Żelazny, K.
Powiązania:
https://bibliotekanauki.pl/articles/134954.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
sea waves
wave parameters
wave energy
converters wave parameters
solid wave power plant
floating wave power plant
Opis:
Seas and oceans occupy approx. 71% of the Earth. On their surface wave action of stronger or weaker magnitude can be observed throughout a major part of the year. Wind-generated wave action contains energy, which can be retrieved and used for electrical current production. The paper shows what energy is contained in wind-generated waves on various ocean areas, presents dynamics of water movement in a wave as well as several examples of calculation results of the velocity of water particles and hydrodynamic pressures occurring in a wave.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 41 (113); 30-34
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Establishment of motion model for wave capture buoy and research on hydrodynamic performance of floating-type wave energy converter
Autorzy:
Gao, H.
Li, B.
Powiązania:
https://bibliotekanauki.pl/articles/259950.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
wave energy
linear wave
floating-type
hydrodynamic
absorption efficiency
Opis:
Floating-type wave energy converter has the advantages of high wave energy conversion efficiency, strong shock resistance ability in rough sea and stable output power. So it is regarded as a promising energy utilization facility. The research on hydrodynamic performance of wave capture buoys is the precondition and key to the wave energy device design and optimization. A simplified motion model of the buoys in the waves is established. Based on linear wave theory, the equations of motion of buoys are derived according to Newton’s second law. The factors of wave and buoys structural parameters on wave energy absorption efficiency are discussed in the China’s Bohai Sea with short wave period and small wave height. The results show that the main factor which affects the dynamic responses of wave capture buoys is the proximity of the natural frequency of buoys to the wave period. And the incoming wave power takes a backseat role to it at constant wave height. The buoys structural parameters such as length, radius and immersed depth, influence the wave energy absorption efficiency, which play significant factors in device design. The effectiveness of this model is validated by the sea tests with small-sized wave energy devices. The establishment methods of motion model and analysis results are expected to be helpful for designing and manufacturing of floating-type wave energy converter.
Źródło:
Polish Maritime Research; 2015, S 1; 106-111
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical investigation of energy absorption elastomer panel with honeycomb structure
Autorzy:
Bogusz, P.
Popławski, A.
Morka, A.
Stankiewicz, M.
Sławiński, G.
Powiązania:
https://bibliotekanauki.pl/articles/246847.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
energy absorption structure
blast shock wave
numerical modelling
elastomer
validation
Opis:
The paper presents a prototype design of elastomer energy absorbing panel made in a shape of honeycomb structure. The proposed panel was installed in a protected plate and tested on a specially designed test stand, where a shock wave from a small explosive charge was applied. The elastomer honeycomb structure was compared with a version of the panel made of solid elastomer materials, the same as used in the honeycomb structure and also with a protected plate without any panels. During the research, acceleration in the middle part of each investigated protected plate was recorded. The protected plates were scanned after the tests in order to measure their maximum deformation. Acceleration graphs and maximum deflections of all three considered structures were compared. The obtained results were used to validate numerical models of the designed structures and the test stand. A discreet model of the test stand and models of elastomer panels were developed with HyperMesh FEM software using shell and solid elements. The materials were described using a tabulated Johnson-Cook model and constitutive model for the rubber parts; all available in the material library of Ls-Dyna software. The blast loading was simulated using the CONWEP method. This model generates a boundary condition, based on the experimental data and TNT equivalent mass, which substitutes the wave propagation with a pressure. Finally, the experimental results of acceleration and deformation of the plates were compared with the corresponding results of the numerical analyses carried out using finite element method. The numerical models can be utilised in the future research as a virtual range stand. The developed elastomer honeycomb structure can be modified to meet various requirements of ballistic protection levels, by applying elastomer of different stiffness or optimizing shape and dimensions of the honeycomb structure.
Źródło:
Journal of KONES; 2015, 22, 4; 29-36
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance assessment of a 2 DOF gyroscopic wave energy converter
Autorzy:
Battezzato, A.
Bracco, G.
Giorcelli, E.
Mattiazzo, G.
Powiązania:
https://bibliotekanauki.pl/articles/281193.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
gyroscope
wave power
flywheel
hydrodynamics
renewable energy
Opis:
Wave Power is one of the most investigated energy sources today. So far, several devices have been tested and built up to the pre-commercial stage. ISWEC (Inertial Sea Wave Energy Converter) has developed at the Politecnico di Torino, exploiting gyroscopes to extract wave energy. It allows power extraction without using any moving part immersed into water. The previous version of ISWEC presented 1 DOF (Degree Of Freedom), therefore requiring alignment of the device to the incoming wave; this paper describes a novel version of ISWEC, with 2 DOFs and consequently able to absorb power from every wave direction. The kinematics and the dynamics of the device are investigated, in order to compare the 1 DOF and the 2 DOF architectures from the point of view of the extracted power. The resulting simulations show that the 1 DOF prototype is more efficient when aligned with the incoming wave, while the behavior of the 2 DOF device is substantially independent of the wave direction. Such a difference of the performances is quantified and discussed along with considerations on the design and realization of the full-scale prototype.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 195-207
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 50

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