Kumar N., Singh S.

Research studies indicate that passive constrained layer damping treatment of a structure is more effective, compact and reliable than the corresponding passive damping for attenuating the vibration from various structural systems. The Present work addresses the effectiveness of the passive constrained layer treatments in enhancing the damping characteristics of viscoelastic layer for thin open shell structures. The extent of vibration control of open shell with variable coverage of constrained layer is analyzed. The constrained layer has been placed on the bases of modal stain energy. Modelling of the partially covered shell which consists of a viscoelastic material, sandwiched between base and constraining layer has been done with finite element method. First order shear deformation theory (FSDT) is used to represent the shell kinematics and equation of motion. Complex shear modulus methods have been used to model the viscoelastic layer. Open shell structures have many applications such as aircraft wings, doors of car and bodies of rockets and missiles.