This study presents a method to reduce high-frequency sound emitted from the mechanical compartment of a household refrigerator. The noise was found to be generated due to the structural vibration of the discharge cover attached to a linear compressor in the mechanical compartment. Based on the vibration characteristics of the conventional discharge cover, a dynamic absorber, which will be combined with the discharge cover, was designed for use in absorbing high-frequency noise in the discharge cover. Product testing for a refrigerator equipped with the modified discharge cover (which has the dynamic absorber) was performed to see if the enhanced discharge cover is useful to reduce the high-frequency sound under consideration. From noise level measurement results, it is observed that 2.5 and 1.7 dB of noise reduction effects on the front and rear sides of the refrigerator are made. Furthermore, it is found that noise in the range of 2800–3550 Hz, where the target frequency of dynamic absorber is included, is reduced. Finally, one can see the feasibility of the proposed method, and it is proven one of the viable solutions to the noise reduction issues in the household refrigerators.

这项研究提出了一种减少家用冰箱机械隔室发出的高频声音的方法。发现噪声是由于安装在机械室中线性压缩机上的排气盖的结构振动而产生的。基于常规排放罩的振动特性，设计了与排放罩结合使用的动态吸收器，用于吸收排放罩中的高频噪声。对配备了改进的排放盖（具有动态吸收器）的冰箱进行了产品测试，以查看增强的排放盖是否有助于降低所考虑的高频声音。从噪声电平测量结果可以看出，为2.5和1。在冰箱的正面和背面均实现了7 dB的降噪效果。此外，发现降低了2800–3550 Hz范围内的噪声，其中包括了动态吸收器的目标频率。最后，可以看到该方法的可行性，并且被证明是解决家用冰箱降噪问题的可行解决方案之一。