Abstract: The mechanisms of active vibration control using an electromagnetic actuator are investigated in this paper.The system test model is built.The vibration transmissibility is derived from the model by means of transfer function analysis.To determine the limited gain values of various feedback variables,the stability analysis of the active control system is carried out The vibration-isolation characteristics of the active vibration control system of the single freedom degree are discussed using an electromagnetic actuator for various variables and various feedback gain valnes with computer simulation.It si shown by analysis results that the combined feedback variable method based on absolute position,absolut evelocity and relative position variables has an effective vibration isolation property even in the condition of the low and wide frequencies.

Key words: active vibration control, electromagnetic actuator, transmis-sibility