钢筋混凝土圆柱壳声辐射特性的有限元研究

Research on acoustic radiation from reinforced concrete cylindrical shell by finite-element method

空气中两端简支支撑的钢筋混凝土加肋壳体的声辐射问题,由于加强钢筋及环肋的作用增加了系统共振频谱的复杂性,用解析的方法解决此类问题存在困难。利用有限元软件ANSYS,分析了内部空气及环肋数量对壳体声辐射特性的影响。计算结果表明,在低频情况下,内部空气对壳体的声辐射特性影响不大,采取合理的加肋措施可降低结构的辐射声压级。

The problem on the acoustic radiation of a simply supported concrete shell with stiffened bars and ~g ribs, which is submerged in air, is difficult to be solved analytically, since the influence of the stiffened bars and ring ribs increase the complexity of the system＇s resonant spectra. In this study, the finite element analysis program ANSYS is applied to investigate the impact of the internal air and the number of the ribs on the acoustic characteristics of the sound radiation from the shell. And the results indicate that in the range of low frequencies, the influence of the internal air on the acoustic radiation characteristics of cylindrical shells is very small. In addition, adding appropriate ribs may reduce the sound pressure level of the structure-radiated noise.