tailieunhanh - Mechanical Systems Design Handbook P15

Because of their electromechanical coupling characteristics, piezoelectric materials have been explored extensively for structural vibration control applications. Some of the advantages of piezoelectric actuators include high bandwidth, high precision, compactness, and easy integration with existing host structures to form the so-called smart structures. | 15 Vibration Suppression Utilizing Piezoelectric Networks Introduction Passive and Semi-Active Piezoelectric Networks for Vibration Absorption and Damping Active-Passive Hybrid Piezoelectric Network Treatments for General Modal Damping and Control Active-Passive Hybrid Piezoelectric Network Treatments for Narrowband Vibration Suppression Nonlinear Issues Related to Active-Passive Kon-Well Wang Hybrid Piezoelectric Networks Pennsylvania State University Summary and Conclusions Introduction Because of their electromechanical coupling characteristics piezoelectric materials have been explored extensively for structural vibration control applications. Some of the advantages of piezoelectric actuators include high bandwidth high precision compactness and easy integration with existing host structures to form the so-called smart structures. In a purely active arrangement an electric field is applied to the piezoelectric materials which can be surface bonded or embedded in the host structure based on sensor feedback and control commands. In response to the applied field stress strain will be induced in the piezoelectric material and active control force or moments can thus be created on the host structure to suppress vibration. In recent years a considerable amount of work has been performed to further utilize piezoelectric materials for structural control by integrating them with external electrical circuits to form piezoelectric networks. Such networks can be utilized for passive semi-active and active-passive hybrid vibration suppressions Lesieutre 1998 Tang Liu and Wang 2000 . Many interesting phenomena have been explored and promising results have been illustrated. The objective of this chapter is to review these efforts and assess the state-of-the-art of vibration control treatments utilizing piezoelectric networks. The basic concepts and development of passive and semi-active networks are discussed in Section . With the .