Vibration suppression of FGM shells using embedded magnetostrictive layers

Analytical solutions of functionally graded material (FGM) shells with embedded magnetostrictive layers are presented in this study. These magnetostrictive layers are used for the vibration suppression of the functionally graded shells. The first-order shear deformation shell theory (FSDT) is employed to study the vibration suppression characteristics. The exact solution for the FGM shell with simply supported boundary conditions is based on the Navier solution procedure. Negative velocity feedback control is used. The parametric effect of the location of the magnetostrictive layers, material properties, and control parameters on the suppression effect are investigated in detail. It is found that (i) the shortest vibration suppression time is achieved by placing the actuating layers farthest from the neutral axis, (ii) the use of thinner smart material layers leads to better vibration attenuation characteristics, and, (iii) the vibration suppression time is longer for a smaller value of the feedback control coefficient. (C) 2004 Elsevier Ltd. All rights reserved.