Abstract
This paper deals with experimental study of active feedback control of leakage-flow-induced vibrations by bimorph PZT actuators. The self-excited leakage-flow-induced vibrations in an one degree of freedom system rigid body is suppressed by controlled fluid force. In order to stabilize leakage-flow-induced vibrations, we developed a control device by using bimorph PZT actuators and proposed a new active feedback control method. The active feedback control is conducted by moving baffle plate driven by bimorph PZT for changing inlet or outlet width of the tapered passage. By measuring RMS value of vibrations displacement and evaluating critical velocity ratio, we investigated control on vibrations performance. As a result, leakage-flow-induced vibrations can be stabilized by proposed the active feedback control technique. In the case of inlet flow control, leakage-flow-induced vibrations can be controlled by the phase progress between the motion of the baffle plate and the displacement of rigid body. Another outlet flow control can be controlled by the phase lag. In addition, inlet flow control is the higher stabilization effect than outlet flow control.
