Design of waveguide vibration absorber with grooved circular disk for reducing refrigerator vibration and noise

Based on the theory of vibration and the principle of impedance, a design method is proposed for a new type of waveguide vibration absorber consisting of an energy guide rod and a grooved circular disk. Compared with traditional dynamic vibration absorbers, this type of absorber can effectively absorb broadband vibration energy in the middle-low frequency range, and ultimately reduce the noise radiated by a vibrating body. This method is applied to design and develop the vibration absorbers for a beverage refrigerator. Finite element simulation results of the compressor casing with and without installing the designed absorbers show that the vibration level of the casing in the frequency range below 1 kHz is significantly reduced. The results of vibration and noise measurement conducted in a semi-anechoic chamber also show that after the installation of vibration absorber, the vibration of the compressor is reduced by 1.0 dB - 4.3 dB in the frequency range of 125 Hz - 1 kHz, and the maximum noise reduction reaches 4.0 dB at 500 Hz.