水下双层圆柱壳辐射声场欠定分离评估方法研究

水下双层加筋圆柱壳振动和辐射声场的评估对其辐射噪声监测和控制具有重要工程意义。文中通过结构振动模态参与因子向量自身的稀疏特性,分析提出了一种基于结构振动的辐射噪声欠定分离评估方法,可实现有限振动测点情况下的水下复杂结构振动和辐射声场的有效评估。数值和试验结果验证了文中方法的有效性,且所需要的振动测点数目少,具有良好的工程适用性。

Research on prediction of radiated acoustic field for submerged double ring-stiffened cylindrical shell using underdetermined separation

The prediction of radiated acoustic pressure field for double ring-stiffened cylindrical shell un-der water is of great importance to noise monitoring and control. Based on the vibration modes of a double ring-stiffened cylindrical shell in vacuum, an underdetermined separation method which can realize pre-diction of radiated acoustic pressure field of the submerged double ring-stiffened cylindrical shell with a few measurement points is proposed. The validity of the prediction results are analyzed through numerical and experiments methods. It demonstrates that the prediction precision is reliable. And the number of mea-suring points needed is acceptable. Consequently, this method has much better applicability.