Vibration Suppression of Smart FGM Cylindrical Shells Using Magnetostrictive Layers

In the present work, FGM shells integrated with magnetostrictive layers acting as distributed sensors and actuators are modeled to control vibration attenuation of FGM shells with simply supported boundaryconditions. To achieve a mechanism for actively control of the oscillation amplitude of the integrated structure, a negative velocity proportional feedback control law is implemented in the study. Theoretical formulation is based on the first order shear deformation shell theory, taking into consideration transverse shear deformation and rotary inertia effects. Material properties are assumed to be temperature-dependent and graded in the thickness direction according to different volume fraction functions. A FGM cylindrical shell made up of a mixture of ceramic and metal is considered. The magnetostrictive layers are also considered to be made of Terfenol-D. The influence of vibration attenuation characteristics of magnetostrictive layers, the location of these layers and control parameters on vibration suppression is investigated.