The design of control systems involving piezoelectric actuators and sensors requires an accurate knowledge of the transfer functions between the inputs and the outputs of the system. These are not easy to determine numerically, particularly for shell structures with embedded distributed actuators and sensors. The situation where they are nearly collocated is particularly critical, because the zeros of the transfer functions are dominated by local effects which can only be accounted for by finite elements. In the first part, this paper develops the theory of piezolaminated plates. The fundamental equations governing the equivalent piezoelectric loads and sensor output are derived. The reciprocity between piezoactuation and piezosensing is pointed out. Piezoelectric finite elements are developed based on Samcef shell elements. The interfacing with a control oriented software environment is discussed in the second part, where some applications are presented.
展开▼
