水介质对船舶轴桨组合振动模态影响  

Influence of Aqueous Medium on the Vibration Modality of Shaft-propeller System in Ship

作　　者：李小军[1] 朱汉华[1] 许浩然 吴继东 熊维 

机构地区：[1]武汉理工大学能源与动力工程学院,武汉4300630 [2]武昌船舶重工集团有限公司,武汉430060

出　　处：《武汉理工大学学报（交通科学与工程版）》2017年第6期1005-1008,1012,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金重点项目资助(51139005)

摘　　要：为了分析水介质对船舶轴桨组合结构振动模态的影响,基于流固耦合动力学方程,在ANSYS Workbench平台计算了某船舶轴桨组合结构在水介质中的振动模态.通过单向流固耦合计算流场预应力对结构振动模态的影响;通过在Workbench中耦合APDL命令流,计算了流场预应力下轴桨组合结构在空气中和水介质中的模态分布.结果表明,流场预应力略微提高结构刚度,其固有频率略微提高;附水质量明显降低结构固有振动频率,但是干湿模态振型顺序相同;水介质阻尼降低固有振动幅值.In order to study the impact of aqueous medium on the vibration modality of shaft-propeller structure in ship,the vibration modality of one shaft-propeller system in aqueous medium was analyzed by ANSYS WORKBENCH software based on the fluid-structure interaction dynamics equation.The one-way coupling method was used to calculate the impact of pre-stress in flow on the vibration modal of the shaft-propeller system.And the modal distributions were calculated separately in air and water considering flow pre-stress through the coupling APDL command in Workbench.The results show that the pre-stress in flow improves the stiffness of structure slightly,and the natural frequency increases slightly.Additional water mass decreases the natural frequency of the structures obviously,but the modal order in air and in water are the same.Aqueous medium damping decreases the amplitude of the natural frequency.

关 键 词：船舶轴系 螺旋桨 振动 水介质 流固耦合 

分 类 号：U664.21[交通运输工程—船舶及航道工程]