Abstract: The cavity resonance of the refrigerator compressor causes the coupling vibration of the shell to produce low and medium noise, which is different from the natural frequency of the shell and has important research significance. This paper first describes the vibration response mechanism of the cavity mode and the cavity-shell coupling, then the finite element method (FEM) is used to calculate the compressor cavity mode frequency, mode shape and velocity distribution. Finally, the spherical nearfield acoustic holography method is utilized to identify the vibration velocity distribution on the surface, and the reconstruction results are consistent with the calculation results of the FEM, which proves the correctness of the cavity-shell coupling resonance analysis based on the FEM and the effectiveness of the surface velocity reconstruction technique in cavity mode identification.

Key words: Refrigerator compressor, Cavity resonance, Fluid-structure coupling, Spherical nearfield acoustic holography, Vibration velocity reconstruction