Đigaš, Ana and Ćorak, Maro and Parunov, Joško (2012) Usporedba programskih alata za linearnu analizu pomorstvenosti kontejnerskih brodova. = Comparison of linear seakeeping tools for containerships. In: XX. simpozij Teorija i praksa brodogradnje, in memoriam prof. Leopold Sorta = The 20th symposium Theory and practice shipbuilding, in memoriam prof. Leopold Sorta, 27-29.09.2012., Zagreb; Croatia.
|
Text
Usporedba programskih alata za linearnu analizu pomorstvenosti kontejnerskih brodova.pdf - Published Version Jezik dokumenta:English Download (440kB) | Preview |
Abstract (Croatian)
Dimenzije modernih ultra-velikih kontejnerskih brodova su takve da izlaze van granica valjanosti pravila klasifikacijskih društava. Također se u projektiranju i službi velikih kontejnerskih brodova pojavljuju značajni hidroelastični efekti osim odziva broda kao krutog tijela. Stoga se projektna opterećenja takvih brodova procjenjuju na temelju analiza pomorstvenosti. Cilj ovog rada je usporediti linearne alate za analizu pomorstvenosti u frekventnoj domeni, primjenjivih u različitim fazama projektiranja kontejnerskih brodova. Najjednostavniji alat su polu-analitički izrazi koje je formulirao Jensen, a koji su namijenjeni fazi idejnog projektiranja. Sljedeći alat korišten u usporednoj analizi je linearna strip teorija, koja je vrlo star, ali još uvijek popularan alat za analizu pomorstvenosti. Konačno, najnapredniji alat korišten u ovoj studiji je moderna 3D panel metoda. Usporedba je izvršena za 3 kontejnerska broda različitih veličina, a kada su dostupni, uključeni su i eksperimentalni rezultati dobiveni modelskim ispitivanjima. Analizirane su dvije vrste odziva na harmonijskom valu – vertikalni valni moment savijanja na glavnom rebru i relativna brzina na pramcu. Za svaki brod, razmatrane su dvije brzine napredovanja i dva kursna kuta (valovi u pramac i valovi između pramca i boka broda). Zahvaljujući brojnim usporedbama, mogu se izvući korisni zaključci.
Abstract
The size of modern ultra-large containerships is such to fall outside the scope of the validity of rules of ship classification societies. Furthermore, in design and operation of large containerships important hydroelastic effects appear in addition to the rigid body response. Therefore, design loads for those ships are to be assessed based on direct seakeeping analysis. The aim of the present paper is to compare linear seakeeping tools in frequency-domain that may be used in different stages of ship design. The simplest tool is closed-form semianalytical expressions formulated by Jensen, which are intended for ship conceptual design. Next tool in the comparison is the linear strip theory, which is very old, but still a very popular tool for ship seakeeping assessment. Finally, the most advanced tool employed in this study is the modern 3D panel method. The comparison is performed for 3 containerships of different sizes, and, when available, with experimental results from model tests. Two ship responses on regular waves that are analyzed are vertical wave bending moment at midship and relative velocity at bow. For each ship, two ship speeds and two heading angles (head and bow seas) are considered. Extensive comparison enables useful conclusions to be drawn.
| Item Type: | Conference or Workshop Item (Lecture) |
|---|---|
| Uncontrolled Keywords: | kontejnerski brod; pomorstvenost; valna opterećenja |
| Keywords (Croatian): | containership; seakeeping; wave loads |
| Subjects: | TECHNICAL SCIENCE > Shipbuilding |
| Divisions: | 600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design |
| Indexed in Web of Science: | No |
| Indexed in Current Contents: | No |
| Date Deposited: | 11 Jun 2015 10:08 |
| Last Modified: | 05 Oct 2017 11:04 |
| URI: | http://repozitorij.fsb.hr/id/eprint/4330 |
Actions (login required)
 |
View Item |
Download Statistics
Download Statistics