【摘要】 船舶动力系统的振动通过壳板向水下辐射噪声的预报一直是非常关键的问题。船舶的声学设计应建立在全船结构声一体化的前提下 ,本文基于船体与周围声学流体介质的耦合作用 ,建立了带有浮筏结构的动力装置的整个双层壳体船舶的FEM/BEM数学模型。在理论分析的基础上 ,利用有限元软件ANSYS建立了水下船舶结构的振动和声场耦合的模型 ,首先计算在模拟发动机的激励下船舶壳板的振动 ,并利用边界元软件SYSNOISE ,对轻外壳面上的声强进行预报。本文的方法为解决大型复杂结构的耦合声振预报提供了一个典型的实例更多还原

【Abstract】 Prediction of the coupled vibration and acoustic radiation from a real ship is a key problem in the naval engineering. The acoustic design must be done in an integration concept. For the whole double-shell ship equipped with multi-stage isolating devices for the power set, theoretical FEM/BEM analysis of the structural vibration,fluid-structure interaction dynamics,and the exterior field pressure radiation has been summarized.A whole ship is modeled by the finite element software ANSYS.The wet modes and coupled vibration velocity are simulated.Then,the velocity of the outer surface is drawn out and set as the acoustic boundary condition.The normal sound intensity of the outer hull is calculated and analyzed by the boundary element software SYSNOISE.This paper gives a useful example for predicting coupled vibro-acoustic behavior of a great naval ship.更多还原