含阻振质量基座的舱室声振特性FE-SEA法分析

摘要

The vibration attenuating function of the blocking mass is analyzed based on the wave theory. The closed loop structures of box-shaped and solid blocking masses are designed and introduced to the main engine pedestal according to the principle of impedance mismatching and wave conversion. On the basis of the modal density, the overall ship structure is divided into FE substructure and SEA substructure. The FE-SEA hybrid method is introduced to predict the vibro-acoustic performance of the cabin. Comparing with the experimental data, the validity of the simulation results is verified. Comparing the cabin’s vibro-acoustic performance of the closed loop pedestal structure with box-shaped hollow blocking masses with that of the original pedestal structure, the influence of the blocking masses on the vibration suppression effect of the pedestal structure is analyzed. It is shown that the cabin with hollow blocking masses structure has better performance of vibration isolation and noise reduction than that with the solid blocking masses and the original structure. Especially in middle frequency domain, performance of vibration isolation and noise reduction is better than the performance in low frequency domain.%基于波动理论分析实心阻振质量阻抑振动波传递特性，根据阻抗失配与波动形式转换原理，设计矩形空心与实心阻振质量回路结构并引入到主机基座周围。以模态密度为划分子结构依据，将整船结构划分为FE子结构和SEA子结构。采用FE-SEA混合法对模型的舱室声振特性进行预测，与实验值进行对比，验证仿真结果的有效性。与原始结构进行对比，分析阻振质量对基座结构振动波阻抑特性。结果表明：布置矩形阻振质量回路后，含有空心阻振质量结构的舱室较原始基座结构和实心阻振结构有较好的减振降噪效果，尤其在中频段减振降噪效果明显优于低频段降噪效果。