聚氨酯夹层板舱口盖振动特性研究

聚氨酯夹层板(SPS)因其出色的力学性能、减振降噪特性等在船舶建造领域得到了广泛应用。以船舶轻量化、高性能设计为目标,以64000DWT散货船钢制舱口盖为替代目标,采用聚氨酯夹层板设计新型舱口盖结构,基于有限元软件Ansys Workbench开展SPS舱口盖结构振动特性分析,研究其模态振型、谐响应和随机振动。通过与钢制舱口盖振动特性的对比研究,论证了聚氨酯夹层板在船舶减重和结构减振方面的优势与前景。研究结果表明:SPS舱口盖设计方案,在实现整体减重12%的情况下,使谐响应振幅降低75%;在1σ区域内,使随机振动的位移、应力响应分别降低了63.4%和76.1%。研究结果可以为船舶结构轻量化设计、舒适性改善等提供参考。

Vibration characteristics analysis of SPS hatch cover

As a substitute for traditional stiffened panels, Steel-Polyurethane-Steel sandwich structures are selected as preferred lightweight load-bearing structure in shipbuilding due to their high strength-to-weight ratio, excellent designable and easily molding. They can also serve as functional structures with excellent energy absorption, corrosion resistance property, vibration suppression and sound insulation properties. A new SPS hatch cover is designed to substitute the steel hatch cover of 64000 DWT Bulk Cargo Carrier for lightweight. Then the modal shape, harmonic response and random vibration of SPS hatch cover structure are investigated with Ansys Workbench. The advantages and prospects of SPS used in shipbuilding for lightweight and structural vibration reduction are demonstrated by comparing with the vibration characteristics of the steel hatch cover. The results showed that using SPS instead of traditional steel hatch cover, the harmonic response amplitude of the structure is reduced by 75% under the condition of 12% weight reduction. In the 1σ region, the displacement and stress responses of the random vibration are reduced by 63.4% and 76.1% respectively. The results can provide reference for lightweight design and comfort improvement of ship structure.