具有弹性障板的有限长充液管道的管口声辐射

求解了下端自由、上端带弹性障板的有限长充液管道,在下端受到流体脉动激励时,上端管口向水下半无限空间的声辐射。求解过程中,管道部分采用行波法求解,其中管壁与管内流体的耦合归结到求解充液管道的色散曲线;弹性障板的振动部分则采用模态法来求解,其中弹性障板及管口与外界流体间的声振耦合最终归结到求解模态的辐射阻抗。数值研究表明:管口辐射的流体声和弹性障板辐射的结构声对系统的声辐射均有较大的贡献。

Sound radiation from a water filled pipe with an attached plate

The sound radiation into semi-infinite water space from a water-filled pipe opening is theoretically analyzed. The opening is attached to an elastic baffling panel. In this analysis, the traveling wave method is used to deal with the wave propagation in water-filled pipe, and the coupling between the pipe wall and water is reduced to finding dispersion curves in water-filled pipe. The modal expansion method is applied to describe the vibration response of the attached plate, and the water loading above the plate is ascribed to calculate the radiation impedance of the corresponding modes. Numerical result shows that both the fluidic and structural modes are important to the sound radiation.