Abstract

Adaptive and controllable shapes and geometries of shells are desirable in many engineering applications, such as antenna dishes, rotor blades, airplane wings, nozzles, etc. In this paper, detailed sensing and control behavior of an adaptive shell panel are investigated. The shell panel changes its geometry from an open shallow shell (30°) to a deep cylindrical shell (150°). Natural frequencies, distributed sensing and damping control characteristics associated with the curvature changes are investigated. Mathematical modeling is presented first, followed by solution procedures. Membrane and bending contributions in sensing and control are evaluated. It is observed that natural frequencies of lower natural modes increase and those of higher modes decrease in the process of curvature transformation from 30° to 150°. Analytical solutions suggest that the membrane sensitivity becomes increasingly important when the curvature increases. The damping controllability of lower modes decreases as the shell curvature increases, however, that of higher modes still increases.

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