This paper presents a robust design method of active controller for paramet
er uncertain vibration systems subjected to external unmeasurable disturban
ces. Based on the combination of complex modal theory, parameter optimizati
on, linear matrix inequality approach, and robust eigenvalue assignment, th
e control law is reconstructed by adjusting the variable parameter r for ro
bust active vibration control. The design is simple and easy to be implemen
ted in real-time control.