期刊
SHIPS AND OFFSHORE STRUCTURES
卷 17, 期 8, 页码 1684-1694出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/17445302.2021.1937803
关键词
Structural vibration; local stiffness modification; von Mises stress; ship design; finite element analysis
资金
- project 'Advanced Computational Tools for Fast Analysis and Design of Ships against Vibration and Noise' - Singapore Maritime Institute [SMI-2015-MA-08]
This article presents a methodology for reducing ship structure vibration through local structural stiffness modifications, considering three design criteria. Testing on simple cases and applying the methodology to a containership model demonstrate that increasing plate thickness in localized regions significantly reduces global vibration levels when excitation is near resonant frequencies.
This article presents a methodology for the reduction of ship structure vibration through local structural stiffness modifications. To identify the locations in the ship structure where the modifications should be made, three design criteria are considered: structural intensity, von Mises stress, and displacement. Two simple cases of cantilever beam and simplified ship were first tested under a harmonic excitation force at a frequency near resonance. The methodology was subsequently applied to a containership model subjected to propeller excitation forces. It is found that the von Mises stress is the most effective criterion in identifying the critical regions for structural modification. By increasing the thickness of plates in small localised regions, the global vibration level in the ship structure can be reduced by 50% when the excitation is near the resonant frequencies. The improvement varies with the structural damping present, and also on the model of mass distribution in the ship.
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