Abstract: The issue of increased noise in refrigerators caused by compressor vibration. Through sweep frequency testing and modal analysis, the vibration characteristics of the compressor-refrigerator coupled system were investigated. The results indicate that the vibration of the compressor in three directions varies with rotational speed, which is closely related to the modal properties of the vibration isolation system composed of the compressor and rubber pads. Vibration amplitude increases significantly when excitation frequencies approach the system’s modal frequencies. In the integrated refrigerator environment, the modal frequencies of the vibration isolation system decrease to varying degrees due to the stiffness of the chassis, leading to a corresponding reduction in resonance speeds. The study demonstrates that effective noise control requires comprehensive consideration of the combined stiffness of the rubber pads and the chassis. Optimizing the parameters of the rubber pads can effectively suppress vibration and prevent excessive noise. These findings provide valuable guidance for the matching design of variable-frequency compressors and refrigerator systems.

Key words: Variable-speed compressor, Refrigerator, Modal, Vibration characteristics, Vibration isolation system