Strukturna analiza kućišta kolotura na jaružaru s grabilicom

Rožić, Filip and Rudan, Smiljko (2014) Strukturna analiza kućišta kolotura na jaružaru s grabilicom. = Structural analysis of guide sheave housing on backhoe dredger. In: XXI. simpozij Teorija i praksa brodogradnje, in memoriam prof. Leopold Sorta = The 21st symposium Theory and practice shipbuilding, in memoriam prof. Leopold Sorta, 02-04.10.2014., Baška; Croatia.

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STRUCTURAL ANALYSIS OF GUIDE SHEAVE HOUSING ON BACKHOE.pdf - Published Version Jezik dokumenta:English

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Abstract (Croatian)

Jaružari s grabilicom spadaju u kompleksne i istaknute brodove. Samopogonjeni, 60 metara dug jaružar s grabilicom, opisan u ovom članku, koristi se za iskopavanje mekog tla u Panamskom kanalu. Za podizanje, premještanje i pozicioniranje jaružara, trup broda opremljen je s tri nosiva stupa: dva fiksna stupa nalaze se u blizini grabilice, dok se treći, hidraulički pogonjeni stup, nalazi na suprotnoj strani jaružara. Podizanje stupa vrši se preko hidrauličkog vitla i kućišta kolotura. Kućište kolotura je bitan dio sustava podizanja stupa i predstavlja netipičan i nestandardan strukturni detalj. Zbog velikih sila u koloturama i važnosti koju ima kućište kolotura, provedena je numerička strukturna analiza u svrhu provjere čvrstoće kućišta, uključujući i proračun faktora koncentracije naprezanja u kritičnim detaljima kućišta. Analiza je provedena metodom konačnih elemenata po “top-down” principu. Generiran je globalni model broda te dvije razine podmodela, na temelju čega je određeno žarišno naprezanje za dva razmatrana detalja. Za ekstrapolaciju naprezanja korištena su IIW I DNV pravila. Raspršenost rezultata i utjecaj načina ekstrapolacije na dobivene rezultate komentirani su u članku.

Abstract

Backhoe dredgers are complex and distinguished ships. A 60m long, self-propelled Backhoe dredger in concern is used for excavation of soft soil in the Panama Canal. For lifting and positioning of the backhoe dredger, the pontoon is equipped with the three spuds: two fixed spuds are positioned close to the excavator, while the third spud, with a hydraulically-operated spud carrier, is positioned on the opposite site of the dredger. Spud lifting operation is performed by hydraulic winch and sheave housings. Guide sheave housing is an important part of the lifting operation and represents a non-typical, custom-made structural detail. Due to significant sheave forces and the importance of the guide sheave housing integrity, a structural analysis is performed to assess the overall strength, as well as the stress concentration in the critical hot-spots. A topdown FEM analysis is performed. Global FE model of the ship and two-level sub-models were generated and then hot-spot stress is being determined on two considered locations. IIW and DNV Rules have been used for stress extrapolation. The results were scattered and the consequences of these findings are commented in the article.

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: strukturna analiza; žarišno naprezanje; globalni model; podmodel; netipicni strukturni detalj
Keywords (Croatian): structural analysis; hot-spot; global model; sub-model; non-typical structural detail
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: 18 May 2015 07:25
Last Modified: 16 Oct 2017 14:54
URI: http://repozitorij.fsb.hr/id/eprint/4171

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