Abstract: Aiming at the equipment installed on a flexible floor, this study makes a model of active vibration isolation with a flexible base. The control force of the actuator is described using transfer mobility, and a uniform power flow function is presented through mobility method when coupling of the equipment, isolators, actuators and the base is fully considered. At last it discusses several active control strategies, for example PID control method, and achieved the goal to control vibration of some modes.

Key words: Active isolation, Coupling, Flexible base, PID control, Power flow