Abstract:

It was noticed that the increased damping of structures by means of electronic damping techniques, a kind of velocity feedback closed loop with piezoceramic wafers as actuators and sensors, was rather limited. The causes are analyzed. A new control approach is presented with a "local strain compensation" and a low cutoff frequency inertial link feedback in place of the differential one. The subsequent experiments on a piezoelectric beam show that the structural modal damping ratio can be promoted significantly.

Key words: electronic damping, piezoelectric actuators, piezoelectric sensors, active control