Best pattern for placement of piezoelectric actuators in classical plate to reduce stress concentration using PSO algorithm

Abstract

The purpose of this article is using piezoelectric actuators to reduce stress concentration factor in classic plates under tensile force. There are three classic plates in this study including plates with hole, notched plates, and filleted plates. Here we look for optimal models for placement of the introduced piezoelectric actuators at different ratios of stiffness to maximize reduction in stress concentration factor. In order to optimize piezoelectric actuators placement, particle swarm optimization algorithm is used. The results show that the location of patches is changed by different values of stiffness ratio (stiffness of plate/stiffness of patches). The findings indicate that the piezoelectric actuators placement models are different for stiffness values at smaller and greater than 1 in classical plates. For stiffness ratios smaller than 1, the patches can reduce the stress directly. However, the actuators follow a certain model in all classic plates at stiffness ratio greater than 1, and reduce stress stream indirectly by affecting the stress stream. The results show that there is a certain model for placement of piezoelectric actuators at any certain stiffness ratio in all classical plates. Three empirical tests have been used to validate the results.