变刚度支撑对船舶轴系横向振动影响分析  

Analysis to the influence of variable stiffness of bearing upon shaft transverse vibration

作　　者：李小军[1] 朱汉华[1] 杨文[1] 刘乐[1] 杨宗榕 

机构地区：[1]武汉理工大学能源与动力工程学院,湖北武汉430063

出　　处：《中国修船》2015年第3期34-37,共4页China Shiprepair

基　　金：国家自然科学基金重点项目(NO.51139005)

摘　　要：为研究轴承水平和垂直变刚度对船舶轴系横向振动的影响,在ANSYS中建立船舶推力轴系有限元模型,通过模态分析和谐响应分析,研究了艉轴承2个共轭方向变刚度时,轴系的横向固有振动频率以及横向受迫振动情况。研究结果表明:随着轴承某一方向的刚度降低时,该方向上横向振动的固有频率也降低,尤其是低阶频率,对应的谐响应振幅也随之降低,这对轴系低阶横向振动影响较为突出。该结果对通过改变轴系支撑刚度来抑制轴系振动提供了理论支持。In order to study the effect of horizontal and vertical stiffness of bearing on shafting transverse vibration, the finite element model of ship shafting was established with the software ANSYS. Through the model analysis and harmonious respones analysis, the change of shaft transverse vibration was analyzed through adjusting the stem tube bearing stiffness of two conjugate direction. The calculation resuhs show that as stiffness of bearing decreases at a certain direction, the transverse natural vibration frequency on this direction is reduced. The harmonic response amplitude decreases too, the effect on low order transverse vibration of shafting is obvious especially. It provides the theory support for suppressing the shafting vibration by changing the bearing stiffness.

关 键 词：船舶轴系 横向振动 模态分析 谐响应分析 

分 类 号：U664.2[交通运输工程—船舶及航道工程]