弹性支撑对多跨梁结构振动特性的影响

Research on the effect of elastic support on vibration characteristics of multi-span beam structure

针对船舶多跨梁结构振动机理揭示不足,基于传递矩阵法开展弹性支撑对多跨梁结构振动特性的影响研究。建立船舶典型多跨梁结构振动分析模型,探究多跨梁结构固有模态和振动传递特性,揭示船舶多跨梁结构振动机理。以弹性支撑多跨梁简化分析船舶加筋板架结构,探究支撑刚度、跨度等对船舶板架结构振动特性的影响规律。研究表明,多跨梁结构的固有频率随支撑跨度和支撑刚度的增大而下降;一定局部支撑刚度下,船舶板架结构振动可简化为多跨梁结构振动,其振动特性与简支梁趋于一致。

Aiming at the insufficient disclosure of the vibration mechanism of the ship's multi-span beam structure,the effect of elastic support on the vibration characteristics of the multi-span beam structure was studied based on the transfer matrix method.The vibration analysis model of the typical multi-span beam structure of the ship is established,the inherent modal and vibration transfer characteristics of the multi-span beam structure are explored,and the vibration mechanism of the multi-span beam structure of the ship is revealed;The structure has explored the influence of support stiffness,span,etc.on the vibration characteristics of ship plate frame structure.The research shows that the natural frequency of the multi-span beam structure decreases with the increase of the span and the stiffness;under certain local support stiffness,the vibration of the ship slab structure can be simplified to the vibration of the multi-span beam structure,and its vibration characteristics are similar to those of the simply supported beam.