Effect of feedback on PID controlled active structures under earthquake excitations

  • Nigdeli, Sinan Melih (Department of Civil Engineering, Faculty of Engineering, Istanbul University)
  • Received : 2013.08.22
  • Accepted : 2013.10.28
  • Published : 2014.02.25


In this paper, different feedback control strategies are presented for active seismic control using proportional-integral-derivative (PID) type controllers. The parameters of PID controller are found by using an numerical algorithm considering time delay, maximum allowed control force and time domain analyses of shear buildings under different earthquake excitations. The numerical algorithm scans combinations of different controller parameters such as proportional gain ($K_p$), integral time ($T_i$) and derivative time ($T_d$) in order to minimize a defined response of the structure. The controllers for displacement, velocity and acceleration feedback control strategies are tuned for structures with active control at the first story and all stories. The performance and robustness of different feedback controls on time and frequency responses of structures are evaluated. All feedback controls are generally robust for the changing properties of the structure, but acceleration feedback control is the best one for efficiency and stability of control system.


structural control;PID controller;feedback control;earthquake excitation


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