Applied self-powered semi-passive control for a 2-degree-of-freedom aeroelastic typical section using shunted piezoelectric materials

The use of smart materials in vibration control problems, including aeroelastic response, has been investigated in several researches over the last years. Although different smart materials are available, the piezoelectric one has received great attention due to ease of use as sensors, actuators, or both. The main control techniques using piezoelectric materials are the active and passive ones. In the case of aeroelastic control, passive piezoelectric networks have a weak capability of improving the flutter stability margin. Although active systems can achieve good vibration control performance, the amount of external power and added hardware are important issues for active aeroelastic control. In this article, the self-powered semi-passive piezoelectric control of a wind tunnel model aeroelastic response is presented as an alternative to active and passive systems. Linear and nonlinear aeroelastic cases are examined using a test apparatus that allows for experiments of pitch and plunge degrees of freedom of a typical section. Piezoelectric coupling is introduced onto the plunge degree of freedom, and two different semi-passive control schemes are employed: the synchronized switch damping on short circuit and the synchronized switch damping on inductor. An autonomous and self-powered switching circuit is employed, providing a useful self-powered method of aeroelastic control.