Abstract: : To satisfy the increasing demand for environmental vibration isolation in high-precision equipment, this study proposes a four-parameter vibration isolator based on eddy current damping. The isolator exhibits wideband and high-performance isolation effects. First, the normalized vibration transmissibility of the isolator was established, and the magnetic field distribution and characteristics of the eddy current damping mechanism were analytically derived using Ampere’s circuit current model and superposition theorem of magnetic fields. Subsequently, finite element analysis was employed to simulate and validate the accuracy of the analytical model of the eddy current damping mechanism, thereby providing a basis for the optimization design and performance verification of the four-parameter vibration isolator. Numerical analysis of the isolation performance indicated that compared with two-parameter isolators, the four-parameter isolator exhibits optimal damping in the frequency domain, effectively suppressing the resonance peak while main-taining high-frequency attenuation performance. Although there was a slight loss in the midfrequency range, the overall wideband isolation performance of the system improved. In the time domain, the steady-state response of the four-parameter isolator aligned with the frequency-domain analysis and achieved stability more rapidly, exhibiting superior transient performance. The four-parameter isolator reduced the random excitation from 1.03 mm to 0.22 mm, achieving an isolation rate of 78.6%, which indicates significant isolation effectiveness.

Key words: four-parameter isolator, eddy current damping, ?nite element method, vibration isolation