欠定盲分离方法预报水下双层圆柱壳辐射声场

摘要

水下双层加筋圆柱壳振动和辐射声场的预估对其噪声控制具有重要意义.以此为出发点,基于双层加筋圆柱壳干模态叠加原理,运用欠定盲分离方法,实现了有限数目测点预报结构振动和辐射声场的目的,并用数值方法对预报结果的有效性进行了验证.结果表明,欠定盲分离方法可以对水下双层加筋圆柱壳辐射声场进行预报,并且该预报方法对测点的位置、选取的模态阶数没有严格的要求,所需要的测点数目也较少,有很好的适用性.%The prediction of vibration and radiated acoustic field for double ring-stiffened cylindrical shell under water is of great importance to noise control. Based on the theory of modal superposition of double ring-stiffened cylindrical shell in vacuum, this paper proposes an underdetermined blind source separation method which achieves the aim of predicting the vibration and radiated acoustic field of the double ring-stiffened cylindrical shell under water with a few measuring points. The validity of the prediction results is analyzed through numerical method. It demonstrates that the prediction is reliable. And it does not has rigorous requirements on the location of the measuring points and the number of selected modes, otherwise, the number of the measuring points needed is acceptable, consequently, this method has much better applicability.