Universal SEA/FEM based method for estimation of vibroacoustic coupling loss factors in realistic ship structures

• Autorzy: Drężek, Michał , Augustyniak, Marek
• Języki publikacji: EN

Abstrakty

EN

Despite the fact that there is an existing body of literature addressing the computation of Coupling Loss Factors (CLFs) via the Finite Element Method (FEM), no publications have sufficiently taken into account real structural joints in their approach. Previous research has focused on academic cases of trivial connections, rarely involving more than two steel plates. To enable Statistical Energy Analysis (SEA) on a real ship, a methodology for determining CLFs for non-trivial systems is proposed, considering realistic boundary conditions and irregularities that can occur in marine structures. Based on the method, a library of CLFs is created by selecting the tested connections to enable modeling of about 90% of the acoustic paths on an existing jack-up vessel. Boundary conditions were set by introducing spring elements with a stiffness calibrated to the type of connection and taking the adjacent structure into account. In previous works, CLFs were determined for basic connections of rectangular plates. The lack of scantling variations, ignoring discontinuities and only defining parallel edges in the considered models, lead to the overestimation of Energy transmission in real structures. To consider the influence of the above, random deviations from the initial stiffness of the springs at individual edges and point restraints at random points are introduced in this paper.

Słowa kluczowe

EN

Statistical Energy Analysis; Power Injection Method; Finite Element Method; Coupling Loss Factor

• Czasopismo: Polish Maritime Research
• Rocznik: 2024
• Tom: nr 1
• Strony: 55--63
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Drężek, Michał

• Fem4cad Sp. z o.o, Gdynia,
• Gdańsk University of Technology, Industrial Doctoral School,Gdańsk, Gdańsk, Poland

autor

Augustyniak, Marek

• Gdansk University of Technology, Institute of Nanotechnology and Materials Engineering, Poland

Bibliografia

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Identyfikatory

DOI

10.2478/pomr-2024-0006