复合圆柱形薄壳在重质流体中声辐射的建模与理论预估Ⅱ

Modeling and Theoretical Prediction of Sound Radiation from Composite Cylindrical Thin Shell Immersed in Heavy Fluids (II)

利用处于无界可压缩重质流体介质中双层复合圆柱形薄壳声振分析的理论模型 ,重点对双层壳体和单层壳体在旋转激励载荷作用下的声辐射能力进行了理论预估 ,并给出了相应的数值计算结果 .计算结果表明 ,壳体在重质流体和轻质流体中的声振特性存在很大差异 .在低频范围 。

Based on the vibroacoustic analysis model of a double-layer composite cylindrical thin shell immersed in a heavy fluid medium, the theorectical prediction of sound radiation ability of this kind of coated shell and bare shell subjected to a circumferential rotating load are mainly studied. Numerical results show that whether coated shell or bare shell, the vibroacoustic characteristics are very different in heavy fluids and in light fluids. Noise reduction in the low frequency range prevails when the outer surface of bare shell is coated with a damp layer.