engleski

Structural Analysis of Guide Sheave Housing on Backhoe Dredger

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.

structural analysis, hot-spot, global model, sub-model, non-typical structural detail

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