某型工作船轴系振动特性及响应分析

Analysis of Vibration Characteristics and Response of the Working Ship Propulsion Shafting

为了评估某工作船轴系轴承参数变化对振动特性的影响,利用有限元软件进行轴系建模、模态和谐响应计算,分析推力轴承纵向刚度、后艉轴承支撑刚度和位置变化对固有频率的影响,并计算轴系的振动响应。结果表明,推力轴承纵向刚度主要影响轴系纵向固有特性,后艉轴承刚度影响中、高阶固有频率,后艉轴承位置影响低、中、高阶固有频率,轴系在激振力作用下后艉轴承处位移最大;建议在轴系设计中优化轴承参数,降低轴系异常振动风险。

To assess the impact of a working ship shafting bearing parameters on the vibration characteristics,the modal analysis and harmonic response are computed by FEM for the shafting to investigate the influence of the thrust bearing longitudinal stiffness,the after stern bearing support stiffness and position upon the natural frequencies,as well as the shafting vibration response. The numerical results show that the main thrust bearing longitudinal stiffness affects the longitudinal natural frequency of shafting,the after stern bearing stiffness impact medium and high natural frequency,the after stern bearing position impact low,medium and high natural frequency,the maximum displacement in place after stern bearing under exciting force. Some suggestions are proposed to optimize the bearing parameters on shafting design process so as to reduce the risk of abnormal vibration.