大型复杂圆柱壳中高频振动噪声仿真计算方法研究

建立大型复杂圆柱壳中高频振动噪声仿真计算方法,对于解决船舶和飞机等大型复杂结构的辐射噪声预报问题具有重要意义。介绍了完美匹配层流固耦合计算方法,并成功应用于大型复杂双层圆柱壳的水下辐射噪声预报,相对于传统的声学流固耦合有限元和边界元计算方法,使外部流场域模型至少缩小了11/15。探讨了环频率和阻尼对圆柱壳结构振动传递的影响,提出了求解中高频声学问题时大型圆柱壳复杂结构仿真建模处理方法。数值算例表明,发展的PML方法和模型简化方法是合理的,可应用工程问题研究。

A numerical simulation method for predicting sound and vibration characteristics of big and complex cylindrical structures

It is much valuable to find a method for predicting the middle and high sound radiation characteristics of big and complex structures such as ships and airplanes.The Perfectly Matched Layer (PML) method is introduced and applied successfully to predict the underwater sound radiation characteristics of complex double cylindrical shell structures.Compared to the conventional coupled finite element method and boundary element method (FEM/BEM),it can reduce the fluid field model to more than 11/15 of the original.The ring frequency and the damping are two important factors for the practical cylindrical structures,and according to their effects to the vibration transmission,a modeling method for the big and complex cylindrical structures is present.Numerical results showed that the PML method and the modeling method are valid and can be applied to deal with engineering problems.