船舶尾轴架动刚度的测量及应用

采用实验方法对某舰尾轴架进行动刚度测量,得到了前尾轴架的横向动刚度曲线,后尾轴架的横向和纵向动刚度曲线;分析尾轴架的动刚度曲线,可得到尾轴架结构的固有频率.用有限元方法对尾轴架固有频率进行计算,比较表明两结果吻合较好.建立了船舶轴系的有限元模型,轴架支撑处动刚度用广义弹簧-阻尼器系统进行模拟.进行了在横向冲击载荷作用下考虑支承结构动刚度的轴系横向冲击响应计算.

Measurement and Application of Dynamic Stiffness of Ship Shaft Brackets

The transverse dynamic stiffness curve of a ship front shaft bracket,and the transverse and longitudinal dynamic stiffness cruves of a back shaft bracket are obtained by means of experiment measurements.Analyses of these curves make the natural frequencies of the shaft brackets available.The natural frequencies can also be obtained through finite element calculation. A comparative analysis indicates that the two sets of results are similar.The finite element model of the ship shaft system is then established,in which the supporting dynamic stiffnesses of the shaft brackets are simulated by the general spring-damper systems. Based on this model, the transverse shock response of the shaft system under transverse shock is calculated with the supporting dynamic stiffnesses taken into consideration.