摘要
根据船舶推进轴系纵向振动的运动微分方程,推导了组成推进轴系的刚性均质圆盘、推力轴承以及轴段单元的传递矩阵,给出了利用传递矩阵求解推进轴系纵向振动固有频率和固有振型的方法。为进一步分析推进轴系正常运行时各轴段的纵向振幅和交变轴向力,对刚性均质圆盘、推力轴承以及轴段单元的传递矩阵进行了扩展,进而给出了基于扩展传递矩阵的推进轴系纵向强迫振动响应计算方法。以某型船的推进轴系为研究对象,采用所提出的方法进行了推进轴系固有频率、振型以及强迫振动响应的计算,并且对螺旋桨附连水质量以及推力轴承刚度对纵向振动计算结果的影响进行了分析。结果表明,轴承刚度的升高和附连水质量的降低会提高推进轴系的纵振固有频率,同时推力轴承纵向刚度的变化对于强迫振动响应计算的轴向位移以及轴向推力幅值的影响更为显著。
According to the motion differential equations of longitudinal vibration of ship propulsion shafting,the transfer matrix of the rigid homogeneous disk,thrust bearing and shaft segment were derived,and the method for solving the natural frequencies and mode shapes are presented.For further analyzing the longitudinal vibration amplitudes and alternating axial forces of each shaft segments,the transfer matrix of rigid homogeneous disk,thrust bearings and shaft segment element were extended.Using the presented method calculate the natural frequencies,mode shapes and the forced vibration response of ship propulsion shafting.Finally the influence of the added mass of propeller and the thrust bearing stiffness on the longitudinal vibration calculation results was analyzed.The results show that the increased bearing stiffness and reduced added mass will increase the natural frequency of longitudinal vibration,and the effect of longitudinal stiffness for the thrust bearing is more significant.
出处
《中国舰船研究》
2011年第6期17-22,共6页
Chinese Journal of Ship Research
基金
海军装备关键技术研究项目
关键词
推进轴系
纵向振动
传递矩阵
临界转速
propulsion shafting
longitudinal vibration
transfer matrix
critical speed
