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Wyszukujesz frazę "free oscillations" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Potential Gravitational - Solar Electromagnetic Spectral Radiance Interaction as the Source of the Earth’s Background Free Oscillations
Autorzy:
Persinger, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/412090.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Earth’s free oscillations
gravitation
solar Rossby waves
nanoGals
spheroidal modes
solar spectral radiance
Opis:
The origins of the continuous free oscillations of the whole earth have been attributed to coupling between the solid earth and atmosphere primarily through the fundamental spheroidal mode 0S29 oscillation of ~3.7 mHz. The origins of these interference patterns have been attributed to an excitation source just above the Earth’s surface. However, comparable surface oscillations have been measured in the Sun’s photosphere. The cube root of the product of the gravitational constant, the spectral radiance of the sun, and the square of the frequency produced an acceleration value that was identical to the measured amplitude of the free Earth oscillations (~0.4∙10-11 m∙s-2). The quantitative convergence suggests these narrow-band accelerations may emerge within the Sun-Earth system as it moves through galactic space. Keywords: Earth’s free oscillations; gravitation; solar Rossby waves; nanoGals; spheroidal modes; solar spectral radiance.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 2; 11-14
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the internal resistance of a hammer drill chisel
Autorzy:
Nikolov, N.
Sinapov, P.
Powiązania:
https://bibliotekanauki.pl/articles/949120.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
free damped oscillations
FEM
Rayleigh damping matrix
damping coefficients
Opis:
The present work examines damped oscillations of a chisel, represented as a distributed parameters system. The system is discretized with the finite element method. Rayleigh’s law is used for the modelling of the resistance. The internal resistance of the mechanical system has been determined by an experiment, then enshrined in the numerical model. Comparison and analysis of the results have been made.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 169-178
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
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:
Fox H-functions as exact solutions for Caputo type mass spring damper system under Sumudu transform
Autorzy:
Qureshi, Sania
Powiązania:
https://bibliotekanauki.pl/articles/1839854.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
special functions
free damped oscillations
un-damped oscillations
driven force
funkcje specjalne
operator Caputo
metoda transformacji Sumudu
transformacja całkowa Smudu
rachunek ułamkowy
Opis:
Closed form solutions for mathematical systems are not easy to find in many cases. In particular, linear systems such as the population growth/decay model, RLC circuit, mixing problems in chemistry, first-order kinetic reactions, and mass spring damper system in mechanical and mechatronic engineering can be handled with tools available in theoretical study of linear systems. One such linear system has been investigated in the present research study. The second order linear ordinary differential equation called the mass spring damper system is explored under the Caputo type differential operator while using the Sumudu integral transform. The closed form solution has been found in terms of the Fox H-function wherein different aspects of the solution can be obtained with variation in a 2 (1;2] and b 2 (0;1]: The classical mass spring damper model is retrieved for a = b = 1:
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 1; 83-89
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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