Abstract:

Engine room’s noise is the main noise source. The noise signal of the engine room of a military ship is measured and its spectrum is analyzed. The main radiation frequency of the noise is found. The contribution of reverberation sound to engine room noise is studied. The scheme for reverberation sound control is worked out, in which a new damping soundabsorption material, the melamine foam, is utilized. Based on the statistical energy analysis (SEA), the geometrical model, the physical model and the mathematical model of the engine room are established. The software for simulating sound absorption of the engine room is made. According to the scheme of design, the melamineformaldehyde?foam coating is equipped in the engine room and then the noise testing is carried out. Result shows that the noise of the engine room is reduced 5.6dB(A).

Key words: acoustics, engine room’s noise, spectral analysis, statistical energy analysis, sound absorption

摘要：

针对某型船艇机舱进行噪声测试及频谱分析，计算混响对舱室噪声的影响。利用新型阻性吸声材料三聚氰胺泡沫塑料，对机舱混响加以控制。以统计能量分析法为基础，编制船艇机舱吸声仿真计算软件，

为船艇机舱噪声预测分析和吸声降噪设计开发提供理论指导。按照设计方案实船安装三聚氰胺泡沫塑料并进行噪声测试，机舱平均声压级降低了5.6dB（A），达到设计要求。

关键词: 声学, 机舱噪声, 频谱分析, 统计能量分析法, 吸声降噪