Vibration analysis and optimization design of a cylindrical shell treated with constrained layer damping

Aiming at the vibration characteristics of cylindrical shells,a cylindrical shell treated with partial constrained layer damping was presented. Its dynamic equation was established based on the constitutive equations of elastic and viscoelastic materials with the energy method. The influence of the damped patch's key parameters on the shell vibration characteristics was investigated. A multi-objective function was established,the objectives of optimization were to maximize the loss factors of the first three modes,and the design variables were the number of damped patches and the gap in axial and circumferential directions,and the thickness of damping layer. An optimization for a cylindrical shell with simply supported edges was performed using the multi-objective genetic algorithm. By analyzing and comparing the modal frequencies changes,and the variations of loss factors and the amplitude-frequency responses of the cylindrical shell before and after optimization,it was shown that a reasonable layout of damping layer segments can reduce the comsumption of damping materials effectively, and can achieve a better vibration reduction effect without changing the dunamic characteristics of the cylindrical shell.