Vibration isolation design and test of water-cooled chillers based on vibration isolation bases

Taking the water-cooled chiller of a certain nuclear power plant as the research object, the vibration isolation effect is analysed through the design of a vibration isolation base, combined with vibration isolation theory and experimental verification. Based on the basic principles of vibration isolation systems, this paper proposes an evaluation system for vibration isolation performance with insertion loss as the core evaluation index. By conducting impedance characteristic test and vibration test, the dynamic characteristic parameters of the vibration isolation base at the 50 Hz characteristic frequency are obtained. The test results show that under the rated conditions, the vibration isolation system achieves a measured average insertion loss of 25.4 dB (A-weighted), and the equivalent force transmission rate is significantly lower than the target limit of 0.05 required for nuclear power plant buildings, verifying the effectiveness of the vibration isolation design. The research results confirm that nuclear-grade water-cooled chillers based on vibration isolation bases can effectively suppress vibration transmission paths, and improve the operational stability of nuclear-grade equipment, providing theoretical and practical support for the vibration isolation design of nuclear-grade seismic-resistant equipment.