The Effect of Dolphin Echolocation-Fuzzy Logic Controller in Semi-active control of structural systems by using endurance time method

Document Type : Article


1 Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Civil Engineering, Parand Branch, Islamic Azad University, Tehran, Iran


An adaptive fuzzy logic controller (FLC) is introduced to actuate MR damper smartly. Moreover, a novel evolutionary algorithm which was named “Dolphin echolocation” (DE) was exploited to optimize the number and arrangement of MR dampers and sensors in the sense of minimum structural responses and their cost. Furthermore, new generation structural systems should be designed based on seismic performance level. Designing based on performance requires dynamic and repetitive time history analyses. The endurance time analysis method (ETA) is a modern dynamic method based on the performance of the structure. In this research, to investigate the efficiency of Dolphin Echolocation-Fuzzy Logic Controller (DE-FLC) and ETA, several ET simulations were performed. The seismic responses of 11th-story benchmark building equipped with MR dampers were investigated in two case of seven time-history analysis and six generation of ET functions. By using Dolphin echolocation, the optimal arrangement and the number of dampers and sensors is determined. The proposed DE-FLC controller demonstrates its efficiency by reducing the excessive displacement under seismic excitations in comparison with uncontrolled case and classical FLC. Furthermore, the results demonstrate that sixth generation of ETA can simulate responses of several time-history analyzes well with proper accuracy, without necessitating any several computational burden.