一种基于 NASTRAN 无限元技术的导管声学计算方法

摘要

A calculation method based on NASTRAN infinite element technology is presented,which can be used for the sound field prediction of all multi-domain problems,and it can be used to deal with ducts of any complex geometry and the vibration of duct walls.The method is validated and the pa-rameters set for calculation are studied.It shows that the radial interpolation order has a significant influence on the accuracy of result,while the location and shape of the infinite element boundary does not.For ducts in air and water,the influence of vibrating walls on sound field is studied respectively. The results show that fluid-structure interaction must be considered for ducts in water,while not in air.%为了更好地研究水下导管声学问题，提出了一种基于 NASTRAN 无限元技术的导管声学计算方法。该方法可用于任意多连通域问题的声场预报，适应任意复杂的导管截面和形状，并能考虑导管壁的弹性振动。对该方法进行了数值验证，并研究了无限元计算参数的设置，结果表明：径向插值阶数对计算结果的影响很大，而无限元边界位置和形状对结果的影响较小。采用该方法研究了管壁振动对空气中和水下导管声场的影响，结果表明：空气中导管可以不考虑管壁的流固耦合振动，而水下必须考虑。