Vibration Confinement of Flexible Structures Using Piezoceramic Actuators

摘要

A vibration confinement is the act of restricting the vibration of a structure to a certain region on the structure. Confinement or restriction of vibrations to relatively unimportant areas helps in isolating vibration-sensitive components from vibratory disturbances and mitigating the damage of the components. In this research, an active vibration confinement technique based on full state feedback strategy, which was proposed by previous authors, is experimentally implemented and verified. The algorithm constructs a square matrix of the closed-loop eigenvectors and a rectangular matrix of the corresponding control vectors. Then, the control gain is uniquely determined by right-multiplying the inverse of the eigenvector matrix to the control vector matrix. The experiment is conducted for a pinned-pinned aluminum beam with two piezoelectric film sensors and two piezoceramic actuators bonded symmetrically along the beam. The vibration of the beam is estimated using an observer and the control actuation is realized using two piezoceramic patch actuators. Experimental results show that active vibration confinement can actually be realized for a lightly damped system with piezoceramic patch actuators.