主机液压顶撑对船体振动控制的影响

Research on influence of hydraulic top bracings in vibration control of ship structure

主机液压顶撑广泛用于主机和船体结构的振动控制中。本文首先讨论了液压顶撑的2种工作模式,即主动模式和被动模式,并在此基础上总结概括了液压顶撑动态特性及其简化模型。针对不同的工作模式,对在振动计算中的模拟及求解方法进行了阐述及对比分析。以某型原油船为例,结合主机顶撑不同的布置形式和工作模式的组合,分别利用模态叠加法和直接积分法进行了全船振动响应分析。计算结果表明,通过设计主机顶撑的布置形式,并根据主机临界转速点转换液压顶撑的工作模式,可达到优化主机和船体结构振动响应水平的目的。

The hydraulic top bracing was widely used to control vibration response of engine and ship structure.The two basic conditions of hydraulic top bracing are firstly discussed,including the standard active condition and the passive condition.And on this basis,the simplified model of dynamic properties of top bracing was summarized.Then,the difference in simulation and solution method of top bracing in ship structure vibration response analysis was studied.Finally,taking an oil tanker for example,the global structural vibration was analyzed with different arrangements and settings of top bracing,solved separately by employing modal superposition method and direct integral method.The results show that based on the selection of top bracing’s arrangement,and switching setting according to main engine critical speed,an optimization vibration response for the engine and ship structure can be carried out.