三聚氰胺泡沫塑料在船艇机舱吸声降噪中的应用

针对噪声严重影响军用船艇战斗性,而船艇噪声主要来自机舱的实际情况,对某型军用船艇机舱进行了噪声测试及频谱分析,发现机舱噪声辐射的主要频段,计算了混响对机舱噪声的影响,制定了采用吸声材料降低机舱混响的降噪方案.通过研究驻波管实验法测试不同密度、不同厚度的三聚氰胺泡沫塑料的吸声系数,确定了三聚氰胺泡沫塑料的结构参数.按照设计方案实船安装了三聚氰胺泡沫塑料并进行噪声测试,其结果为机舱平均声压级降低了5.6 dB,达到设计要求.

APPLICATION OF MELAMINE FOAM IN ACOUSTIC ABSORPTION OF MILITARY SHIP ENGINE ROOM

The noise of the military ship had a very tremendous influence on the fight performance. And the engine room noise was the main noise radiant resource. The noise signal of a military ship engine room had been analyzed. The main radiation frequency was found out. The influence of reverberation sound to engine room noise was studied too. The scheme was worked out about reverberation sound control, which carried on sound absorption facing. The effect of thickness and density of the melamine foam on the sound absorption coefficient was analyzed by impedance experiment. And then the parameters were made certain. Melamine-formaldehyde foam facing was equipped in the engine room and then tested. The noise of the engine room was reduced 5.6 dB, arriving at the design requirements.