分舱和充液对箱式主机滑油舱振动模态的影响

为更好地了解船舶舱室结构的振动特性,为主机隔振降噪提供有用的理论参考,采用有限元方法对主机滑油舱进行了模态分析,分析分舱和其内部油液液位对结构振动模态的影响.结果表明,随着分舱舱室数目的增加,主机滑油舱整体固有频率上升,振型多表现为局部舱室表面的鼓胀振动;而充液液位的升高使系统的频率降低,算例中第一阶频率的下降比峰值为2.07(l/m);同时对系统第一阶频率和液位的变化关系进行解析,拟合误差仅为0.222%.,便于其他液位时第一阶振动频率的求解.

Influence of subdivision and contained oil on the vibration modality of boxed main engine lubrication oil tank

The finite element method is used to take modal analysis of main engine lubrication oil tank,which aims to better understand the vibration characteristic of ship cabin,and to provide helpful reference for the vibration isolation of main engines. The effect of subdivision and contained oil on the vibration modality of structure is analyzed. The simulation results show that when the frequencies of main engine lubrication oil tank increase with the growing room subdivisions,the modal shapes are almost as bulgi...