Multiple and frequency-varying tonal vibrations are a common problem in flexible structures, such as lightweight means of transportation, induced by engine speed/rotor rotations, and their harmonics. A Semi-Active piezoelectric Tuned Mass Damper (SATMD) is developed for the suppression of these excitations, which consists of a resonant mass and a combined spring-piezoelectric device connected to an external resistive-inductive electric circuit. Calibrated alterations of the shunt circuit impedance do not simply adjust the anti-resonance of the auxiliary mass to potential frequency fluctuations, ensuring optimal performance within this frequency range, but also introduce a second—also tunable—anti-resonance, associated with the eigenfrequency of the electric current. As a result, this enables effective multi-tonal vibration control, even in distant frequency vicinities, using a lightweight antivibration device. These vibration suppression effects are first numerically and experimentally demonstrated on a down-scaled simplified airframe model. Then, the SATMD is attached to the airframe of a BO 105 S helicopter, and its vibration control capabilities are tested in actual flight conditions.
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