An Unconventional Direction for Vibration
Delayed Feedback Vibration Absorbers
In this talk a summary of development over the last 7 years is
The departure point of the program is a delayed feedback control structure
which sensitizes a passive vibration absorber. The new absorber is a tuned
resonator and can suppress oscillations at its resonance frequency and at the
point of attachment to the primary structure. It is named the "Delayed
Resonator" (DR). It has decoupled control features from the primary system and
shows real time tuning features. The DR can be further tuned to dual resonances,
thus enabling the suppression to be effective at two distinct frequencies.
In a broader treatment the delayed feedback structure can be used as a
tool for pole placement. Several research results including centrifugal
vibration absorbers, optimally tuned wide-band absorbers are included
along this line.
Experimental and analytical results are presented.