Active damping of a stiff beam-like structure with acceleration feedback

This paper describes a local control scheme using acceleration feedback and a colocated proof-mass actuator for active damping of structures. The closed-loop system is unconditionally stable. The control law is implemented digitally on a stiff beam (f ₁=68 Hz) representative of an optical test bench. The modal damping ratio is improved from below 0.2 percent to above 4 percent.