ADAPTIVE IMPEDANCE CONTROL USING PIEZOELECTRIC HONEYCOMB ACTUATOR CONCEPTS

摘要

The success of active vibration control in adaptronics decisively depends on the performance of the actuators used as multifunctional structural elements. An impedance based formulation allows the consideration of several aspects at the same time such as mechanical properties, actuator characteristics, control structure interaction effects, and optimization criteria. The optimal actuator design depends on both the control goal as well as the structural environment. Therefore the actuator transfer function cannot be assumed as a real proportional factor on principle. On the contrary the complex actuator impedance is considered as the transfer function. This function is shaped and contains phase shifts. The presented concept of an impedance matched actuator suggests piezoelectric material systems structured in form of honeycombs. Numerical and experimental investigations show the lightweight potential and further advantages: honeycomb actuators may have high static stiffness with high load capacities and may realize large deflections for active vibration control at the same time.