The problem of vibration reduction of rotary wings in forward flight is studied using the concept of individual blade control. Smart structures are used as a means to construct geometric modal filters able to perform independent modal control of the critical modes in the rotating frame. A real time controller that could circumvent the inherent nonlinearities of the system and is intrinsically robust is devised.

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Journal Smart Materials and Structures
Nitzsche, F, & Breitbach, E. (E.). (1994). Vibration control of rotary wings using smart structures. Smart Materials and Structures, 3(2), 181–189. doi:10.1088/0964-1726/3/2/014