REDUCTION OF VIBRATION AND OPTIMIZATION OF BEAMS WITH CONSTRAINED LAYER DAMPING PATCH BASED ON GENETIC ALGORITHM

Though the constrained layer damping can reduce the vibration effectively,it increases the weight and the size of the structure.Thereby an optimization of the constrained layer damping treatment is necessary. In this paper,a new model of the partial stand-off constrained layer damping patch is established in the finite element software ANSYS.Based on modal strain energy principles,the modal loss factor of the proposed model can be found.An objective function related to the modal loss factors is constructed.Its design variables include the number,the length and the spacing between of damping patches,the thickness of the stand-off layer and the constrained layer.By using the multi-objective genetic algorithm of MATLAB,the optimization is carried out. The results of examples show that after the optimization the constrained layer damping can reduce vibration more effectively with less additional weight and attenuate the vibration of the structure in a shorter period of time than before the optimization.