Wyniki wyszukiwania dla: RIGID SPHERE - MOST Wiedzy

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Wyniki wyszukiwania dla: RIGID SPHERE

Wyniki wyszukiwania dla: RIGID SPHERE

  • TIME-AND-SPACE STRUCTURE OF FORCE-DRIVEN RIGID SPHEREWAVEFIELD

    Publikacja

    - Rok 2015

    This paper introduces a time-domain, causality-inspired description of a vector-source acoustic wavefield of arbitrary time evolution, where a sphere is a practical realisation of quasi-point contact surface without which a point force would not be able to exert an impact onto non-viscous fluid. At every space location, the resulting acoustic field is described by a pair of physical variables characterising the time evolution of...

  • Time-frequency analysis of acoustic signals using concentrated spectrogram

    Publikacja

    The paper presents improved method of time-frequency (TF) analysis of discrete-time signals. The method involves signal's local group delay (LGD) and channelized instantaneous frequency (CIF) to purposely redistribute all Short-time Fourier transform (STFT) lines. Additionally, the energy concentration index (ECI) and some histogram-like statistics are used to evaluate readability of estimated TF distributions of the energy. Recorded...

  • Cavity-expansion approximation for projectile impact and penetration into sand

    Publikacja
    • V. Kotov
    • A. Bragov
    • V. Balandin
    • L. Igumnov
    • A. Lomunov
    • V. Eremeev
    • A. Cazzani

    - CONTINUUM MECHANICS AND THERMODYNAMICS - Rok 2022

    A one-dimensional problem of a spherical cavity expanding at a constant velocity from zero initial radius in an infinite granular medium, which has the first-kind self-similar solution, is considered. We are solving this dynamic spherical cavity-expansion problem to model rigid spheres penetrating into a granular media. Elastic–plastic deformation of the granular media is described in a barotropic approximation, using the high-pressure...

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