基于功率流法的振动与声辐射研究

Vibration and sound radiation research based on power flow method

文章以水中有限长加肋圆柱壳为研究对象,利用模态叠加法导出了在点激励作用下壳体中传播的功率流表达式,以及辐射声功率的表达式,提出了辐射因子,通过数值算例探索了三种振动波功率流在不同频段及不同位置的传播特性,并在不同频段对传播功率流作了一定简化,进一步分析了其能量传播规律。

This paper studies stiffened finite cylindrical shells in water based on modal superposition approach. Expressions of vibrational power flow and sound radiation power are obtained and the radiation factor is proposed furthermore when the shell is excited by a point force. The propagation characteristic of three kinds of vibrational power flow in different bands and positions are also explored through a numerical example. In different bands, the expressions of propagation power flow are simplified in order to analyse the propagation regularity of energy furthermore.