舰船艉轴架模态分析

Modal Analysis of Ship Shaft Bracket

采用有限元数值计算方法 ,以某舰为代表 ,建立舰船艉轴架模态分析的数学模型 ,计算并分析军规中所要求的艉轴架的一阶频率。在此过程中 ,利用模态质量对艉轴系统的频率进行筛选 ,从而得到P字架的横向和A字架的横、纵、垂向的一阶频率 ,并与军规中的要求相比较 ,校核艉轴架的模态特性。

The finite element method is used and a certain naval ship is taken as an example,a mathematical model of the ship's shaft bracket for its modal analysis is established.The first-order natural frequency of the bracket,which is required to be calculated by a Chinese military specification concerned,is calculated and analyzed.In this course,by use of modal effective mass,the transverse first-order natural frequency of P-bracket and the transverse,longitudinal and vertical first-order natural frequency of A-bracket are chosen from the whole natural frequencies,and the modal characteristics of the brackets are checked by comparing with the requirements in the military specification.