舰船刚性阻振质量基座中频振动特性研究

Characteristics of Ship Pedestal with Rigid Vibration Isolation Mass in Mid-Frequency Domain

有限元与统计能量混合法(FE-SEA)将计算低频响应的有限元法(FEM)与计算高频响应的统计能量法(SEA)结合起来,有效解决了FEM计算量大而SEA计算不准的中频域问题。提出在舰船弹性基座中引入刚性减振器,即在舰船基座与船体结构连接部位布设刚性阻振质量,并采用基于FE-SEA混合法的VA One软件对舰船刚性阻振质量基座的中频振动特性进行了研究。结果表明,刚性阻振质量对中高频结构噪声可起到明显的隔振作用,而对低频结构噪声的减振效果则不明显,甚至没有减振效果,这对刚性阻振技术在实艇基座减振降噪设计中的应用具有一定的实际工程价值。

This paper aims to predict the vibration characteristics of rigid vibration isolation mass in the mid-frequency range.However,the calculation by FE method is quite time-consuming for low-frequency range,while by SEA method it cannot get exact results for mid-frequency range.A ship pedestal with rigid vibration isolation mass was studied by introducing the FE-SEA hybrid method with VA One software to deal with this problem.In the design of ship pedestal,a rigid vibration absorber was added,which positioned at the region of ship pedestal connected with the ship structure.The results show that for medium-high frequency structure noise,rigid vibration isolation mass can effectively reduce the vibration and sound radiation of the non-pressure hull,while in low frequency,vibration isolation effect of the mass is not so obvious.