Ditemukan 5 dokumen yang sesuai dengan query
Anna Perelomova
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ABSTRAK
Variations in the thermodynamic state of a dispersive medium, caused by sound, are studied. A bubbly liquid and a Maxwell fluid are considered as examples. Curves in the plane of thermodynamic states are plotted. They are in fact pictorial images of linear relations of excess pressure and excess density in the acoustic wave which reflect irreversible attenuation of the sound energy. The curves account for the nonlinear generation of the entropy mode in the field ...
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TASK, 2017
600 SBAG 21:1 (2017)
Artikel Jurnal Universitas Indonesia Library
Anna Perelomova
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ABSTRAK
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 increases 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 of the gas in the leading ...
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TASK, 2017
600 SBAG 21:2 (2017)
Artikel Jurnal Universitas Indonesia Library
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This multi-contributed volume provides a practical, applications-focused introduction to nonlinear acoustical techniques for nondestructive evaluation. Compared to linear techniques, nonlinear acoustical/ultrasonic techniques are much more sensitive to micro-cracks and other types of small distributed damages. Most materials and structures exhibit nonlinear behavior due to the formation of dislocation and micro-cracks from fatigue or other types of repetitive loadings well before detectable macro-cracks are formed. Nondestructive evaluation (NDE) tools that have been developed based on ...
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Switzerland: Springer Nature, 2019
e20509321
eBooks Universitas Indonesia Library
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This multi-contributed volume provides a practical, applications-focused introduction to nonlinear acoustical techniques for nondestructive evaluation. Compared to linear techniques, nonlinear acoustical/ultrasonic techniques are much more sensitive to micro-cracks and other types of small distributed damages. Most materials and structures exhibit nonlinear behavior due to the formation of dislocation and micro-cracks from fatigue or other types of repetitive loadings well before detectable macro-cracks are formed. Nondestructive evaluation (NDE) tools that have been developed based on ...
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Switzerland: Springer Cham, 2019
e20502909
eBooks Universitas Indonesia Library
Gurbatov, S.N.
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Waves and structures in nonlinear nondispersive media : general theory and applications to nonlinear acoustics” is devoted completely to nonlinear structures. The general theory is given here in parallel with mathematical models. Many concrete examples illustrate the general analysis of Part I. Part II is devoted to applications to nonlinear acoustics, including specific nonlinear models and exact solutions, physical mechanisms of nonlinearity, sawtooth-shaped wave propagation, self-action phenomena, nonlinear resonances and engineering application (medicine, nondestructive testing, ...
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Berlin: Springer, 2011
e20421024
eBooks Universitas Indonesia Library
