Wyniki wyszukiwania dla: NONLINEAR EFFECTS OF SOUND

• The nonlinear effects of sound in a liquid with relaxation losses

  Publikacja

  • A. Perelomova

  - CANADIAN JOURNAL OF PHYSICS - Rok 2015

  The nonlinear effects of sound in electrolyte with a chemical reaction are examined. The dynamic equations that govern non-wave modes in the field of intense sound are derived, and acoustic forces of vortex, entropy, and relaxation modes are determined in the cases of low-frequency sound and high-frequency sound. The difference in the nonlinear effects of sound in electrolyte and in a gas with excited vibrational degrees of molecules,...

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• Features of Nonlinear Sound Propagation in Vibrationally Excited Gases

  Publikacja

  • A. Perelomova
  • M. Kuśmirek-Ochrymiuk

  - Archives of Acoustics - Rok 2013

  Weakly nonlinear sound propagation in a gas where molecular vibrational relaxation takes place is studied. New equations which govern the sound in media where the irreversible relaxation may take place are derived and discussed. Their form depends on the regime of excitation of oscillatory degrees of freedom, equilibrium (reversible) or non-equilibrium (irreversible), and on the comparative frequency of the sound in relation to...

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• Tollmien- Shlichting and sound waves interaction: nonlinear resonances.

  Publikacja

  • A. Perelomova
  • S. Leble

  - Rok 2002

  Rozpatruje się oddziaływanie różnych typów modów hydrodynamicznych w warstwie lepkiej. Stwierdzono możliwość istnienia oddziaływania rezonansowego.Dokładne równania ewolucyjne kierujące dynamiką warstwy lepkiej zostały wypisane.

• Nonlinear Influence of Sound on the Vibrational Energy of Molecules in a Relaxing Gas

  Publikacja

  • A. Perelomova

  - Archives of Acoustics - Rok 2012

  Dynamics of a weakly nonlinear and weakly dispersive flow of a gas where molecular vibrational relaxation takes place is studied. Variations in the vibrational energy in the field of intense sound is considered. These variations are caused by a nonlinear transfer of the acoustic energy into energy of vibrational degrees of freedom in a relaxing gas. The final dynamic equation which describes this is instantaneous, it includes a...

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• Nonlinear increase in bubbles radii caused by sound in a bubbly liquid

  Publikacja

  • A. Perelomova
  • W. Pelc-Garska

  - CENTRAL EUROPEAN JOURNAL OF PHYSICS - Rok 2012

  The nonlinear interaction of acoustic and entropy modes in a bubbly liquid is considered. The reasons for interaction are both nonlinearity and dispersion. In the field of intense sound, a decrease in the mixture density is predicted. That corresponds to the well-established growth of bubbles volumes due to rectified diffusion. The nonlinear interaction of modes as a reason for a bubble to grow due to sound, is discovered. The...

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• Nonlinear phenomena of small-scale sound in a gas with exponential stratification

  Publikacja

  • A. Perelomova

  - TASK Quarterly - Rok 2017

  The nonlinear dynamics of perturbations, quickly varying in space, with comparatively large characteristic wavenumbers k: k>1/H, is considered. H is the scale of density and pressure reduction in unperturbed gas, as the coordinate (H is the so-called height of the uniform equilibrium gas). Coupling nonlinear equations which govern the sound and the entropy mode in a weakly nonlinear flow are derived. They describe the dynamics...

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• Studies of Nonlinear Sound Dynamics in Fluids Based on the Caloric Equation of State

  Publikacja

  • A. Perelomova
  • P. Wojda

  - Archives of Acoustics - Rok 2010

  The sound speed and parameters of nonlinearity B/A, C/A in a fluid are expressed in terms of coefficients in the Taylor series expansion of an excess internal energy, in powers of excess pressure and density. That allows to conclude about features of the sound propagation in fluids, the internal energy of which is known as a function of pressure and density. The sound speed and parameters of nonlinearity in the mixture consisting...

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• Investigation of influence of space mopdes interaction on nonlinear dynamics of sound beams

  Publikacja

  • A. Perelomova
  • I. Vereshchagina

  - ACOUSTICAL PHYSICS - Rok 2002

  Operatory rzutu na mody są zdefiniowane w dynamice płynów trójwymiarowych. Zostały wyprowadzone równania ewolucyjne. Rezultaty obliczeń numerycznych przedstawione.

• Analysis of nonlinear effects as a diagnostic tool

  Publikacja

  • L. Hasse
  • J. Sikula
  • M. Blaha

  - Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Rok 2006

  Metody analizy efektów nieliniowych nieliniowej analizy sygnałów na wyjściu testowanych obiektów umożliwiają badanie występowania defektów i uszkodzeń w materiałach i elementach elektronicznych, co jest niezbędne w predykcji niezawodności. W odniesieniu do elementów biernych bardzo skutecznym narzędziem okazuje się być wskaźnik trzeciej harmonicznej (THI - Third Harmonic Index). W artykule bardziej szczegółowo opisano pomiary parametru...

• Nonlinear generation of non-acoustic modes by low-frequency sound in a vibrationally relaxing gas

  Publikacja

  • A. Perelomova

  - CANADIAN JOURNAL OF PHYSICS - Rok 2010

  Two dynamic equations referring to a weakly nonlinear and weakly dispersive flow of a gas in which molecular vibrational relaxation takes place. are derived. The first one governs an excess temperature associated with the thermal mode, and the second one describes variations in vibrational energy. Both quantities refer to non-wave types of gas motion. These variations are caused by the nonlinear transfer of acoustic energy into...

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