Temat: fluid-structure interactions - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Effect of a Concentrated Mass on the Acoustic Power and the Resonant Frequencies of a Circular Plate
Autorzy:: Rdzanek, Wojciech P.
Szemela, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/31339950.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: thin plate
concentrated mass
fluid-structure interactions
resonant frequencies
modal expansion
acoustic power
Opis:: This study presents an analysis of the effect of the concentrated mass on the acoustic power and the resonant frequencies of a vibrating thin circular plate. The fluid-structure interactions and the acoustic wave radiation effect have been included. The eigenfunction expansion has been used to express the transverse displacement of the plate. The appropriate number of modes is determined approximately to achieve physically correct results. Then highly accurate results are obtained numerically. The radiated acoustic power has been used to determine the resonant frequencies. The introducing of the concentrated mass is justified by modelling the added mass of the moving component of the exciter.
Źródło:: Archives of Acoustics; 2022, 47, 4; 529-538
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Spectral response of stationary jack-up platforms loaded by sea waves and wind using perturbation method
Autorzy:: Rozmarynowski, Bogdan
Jesien, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/2033184.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: structural dynamics
offshore structures
loads
fluid flexible structure interactions
random variables
stochastic processes
spectral analysis
perturbation method
Opis:: The paper addresses non-linear vibrations of offshore jack-up drilling platforms loaded by sea waves and wind in their stationary condition using the perturbation method. Non-linearity of dynamic equations of motion for fixed offshore platforms yields from two factors. The first is load excitation generating non-linear velocity coupling in a dynamic system. This coupling is inherent in the modified Morison equation, involving the excitation function in the form of the sum of the inertial and velocity forces of sea waves, taking into account relative wave–structure kinematics. Moreover, the wind acting on the exciting side causes similar effects. The second source is the subsoil‒structure interaction problem, modelled by a system of springs and dashpots that yields stochastic non-linearity of the dynamic system. The matrix equations of structural motion in FEM terms are set up. The perturbation method is adopted to determine the mechanical response of the system, making it possible to determine response spectra of the first and the second approximations for displacements and internal forces of the platform. The paper is the continuation of research detailed in the paper [1]. It is assumed, that the fluctuation parts of the dynamic loading forces are in line with the direction of sea wave propagation. Sea current and lift forces effects are neglected in this study. A numerical example refers to structural data of the Baltic drilling platform in the stationary configuration, i.e. when three legs support the deck above the seawater level.
Źródło:: Polish Maritime Research; 2021, 4; 53-62
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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