Structurally Integrated Piezoelectric Stack Absorbers for Nonstationary Disturbance Rejection
PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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In this research, the active-passive piezoelectric absorber concept is investigated for nonstationary disturbance rejection and vibration control of complex structures, integrated with multiples of such absorber actuators. A scaled helicopter tailboom with four piezoelectric stack actuators is used as a testbed in this study. The stacks are connected to a power source through an inductor, and are actuated via a three-part control law. The first part, active inductance tuning, simulates a change in the apparent inductance allowing the absorbers to be effective over a wide frequency range. The second part, negative resistance, removes undesirable resistance damping from the absorber circuits thereby increasing the performance. The last action, active coupling, emulates an increase in the electro-mechanical coupling and adds to the robustness of the treatment. To expand the design from controlling a single-actuator simple system to a multi-actuator complex structure, the modal filter approach is used to identify the required feedback signals from the sensor readings. The effects of the differences and uncertainties of the different actuators on the system performance are also analyzed. It is show that the active coupling action will significantly reduce the negative effects of the actuator uncertainties on the system performance. From examining the analytical and experimental results, the effects of the apparent electromechanical coupling factor are discussed and means to advance the investigation are identified.
- Machinery and Tools
- Electricity and Magnetism