基于复合吸声结构的冰箱降噪研究

Research on noise reduction of refrigerator based on composite sound absorbtion structure

冰箱压缩机3900RPM高频运行时辐射声大,辐射声频段为1500~3000Hz,此频段噪声容易使用户产生烦躁情绪。目前将吸音棉粘贴在压缩机舱后盖板上来降低辐射声,但吸音棉吸声频段窄,降噪效果有限,仅为0.7dB(A)。针对此问题,提出微穿孔板+吸声空腔的压缩机舱复合后盖板吸声结构。通过数值计算方法模拟驻波管实验计算吸声系数,确定吸声空腔的尺寸为20mm。经验证,压缩机转速3900r/min时可降噪1.74dB(A),说明复合后盖板降噪明显。

When the refrigerator compressor run at 3900 rpm,the radiation noise ranged from 1500~3000 Hz is loud.The noise easily cause the user to get upset.To reduce the radiation noise,the sound absorbtion cotton is pasted on the cover plate of the compressor cabin,but the sound absorbtion effect is limited,only 0.7 dB(A).To solve this problem,a composite sound absorption structure with micro perforated plate and sound absorption cavity is proposed.To design the sound absorption cavity,the numerical simulation is adopted to calculate the sound absorption coefficient of sound absorption cavity with three sizes,and the size is determined to be 20 mm.After experimental verification,the compressor radiation noise is reduced by 1.74 d B(A)at 3900 rpm,which indicates the composite sound absorption structure is effective to reduce noise.