Odziv plutajućeg valobrana na morskim valovima

Tanocki Musa, Ela (2017) Odziv plutajućeg valobrana na morskim valovima. = Floating breakwater response to sea waves. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Ćatipović, Ivan.

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Abstract (Croatian)

Snažan vjetar i valovita stanja mora prijetnja su svim plovnim objektima, a naročito onima usidrenim za vrijeme oluje, jer njihova pojava i razorna djelovanja mogu pruzročiti veliku štetu. Plutajući valobran je plovni objekt koji svojom konstrukcijom omogućuje ublažavanje valnog djelovanja, odnosno ima svojstvo prigušenja ili atenuacije valova.Valobran omogućuje da se val, sudarivši se sa bočnom površinom valobrana, jednim dijelom odbija tj. događa se djelomična refleksija vala dok se drugim dijelom ''prenosi'' kroz valobran. Na taj način val koji je naišao na valobran te ga prošao ima znatno smanjenu valnu energiju te manju mogućnost da svojim djelovanjem izazove štetu na plovnim objektima koji se sidre sa druge strane valobrana. Upotreba valobrana je vrlo učestala na područjima koja su predviđena za sidrenje plovnih objekata kao što su marine, luke ili pristaništa. Cilj ovog diplomskog rada bio je za definirana stanja mora izračunati odziv te atenuaciju plutajućeg valobrana pomoću spektralne analize za svih šest stupnjeva slobode gibanja valobrana gdje su valovi na tijelo nailazili pod kutem od 90 i 60 stupnjeva. Prijenosne funkcije potrebne za daljnji proračnu spektralne analize te atenuacije dobivene su pomoću programskog paketa HydroStar (Bureau Veritas) koji radi na temelju linearne teorije potencijalnog strujanja i panele metode, odnosno trodimenzionalne metode rubnih elemenata. Sidreni sustav koji je korišten u ovom radu je Seaflex.

Abstract

Strong wind and wavy state of the sea are a threat to all floating objects, especially those anchored during a storm, because a storm with its destructive nature can cause a grave damage. The floating breakwater is a floating object, whose construction enables attenuation (damping) of waves. After the wave crashes the lateral surface of the breakwater, the breakwater enables in one part the decline of the wave, meaning that there is a partial reflexion of the wave, while in the other part the wave goes through the breakwater. This means the wave, which crashed against the breakwater and passed against it, has a significantly lower wave energy and therefore lower possibility to cause damage to floating objects, which are anchored on the other side of the breakwater. The breakwater usage is very common in the areas, which are intended for anchoring of floating objects, such as marines, ports or docks. The aim of this master thesis was to calculate the response and attenuation of the floating breakwater, whilst taking into consideration the state of the sea, and using the spectral analysis with all six degrees of freedom of the breakwater, where the waves crashed the breakwater under the 90 and 60 degree angle. Portable functions, which were necessary for the further calculation of the spectral analysis and the attenuation, were obtained using the programme package HydroStar (Bureau Veritas), which operates on the basis of potential flow linear theory and panel method, specifically three-dimensional borderline elements method. Anchoring system used in this thesis is Seaflex.

Item Type: Thesis (Master's thesis (Bologna))
Uncontrolled Keywords: valobran, prigušenje, refleksija, sidrenje, odziv valobrana, prijenosna funkcija, spektralna analiza, teorija potencijalnog strujanja, Seaflex
Keywords (Croatian): breakwater, attenuation, damping, reflexion, anchoring, breakwater response, spectral analysis, potential flow linear theory, panel method, Seaflex
Subjects: TECHNICAL SCIENCE > Shipbuilding > ship design and offshore technology
Divisions: 600 Department of Naval Engineering and Marine Technology > 630 Chair of Ship Design and Offshore Technology
Date Deposited: 11 Dec 2017 11:05
Last Modified: 12 Dec 2017 11:53
URI: http://repozitorij.fsb.hr/id/eprint/8185

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