In the real application of active control systems to mitigate the response of structures subjected to sever external excitations such as earthquake and wind induced vibrations, since the capacity of actuators is limited then the actuators saturate. Hence, in designing controllers for linear and nonlinear structures under sever earthquakes, the actuator saturation should be considered as a constraint. In this paper optimal design of active controllers for nonlinear structures by considering the actuator saturation has been studied. To this end a method has been proposed based on defining an optimization problem which considers the minimizing of the maximum displacement of the structure as objective when a limited capacity for actuator has been used as a constraint in optimization problem. To evaluate the effectiveness of the proposed method, a single degree of freedom (SDF) structure with a bilinear hysteretic behavior has been simulated under a white noise ground acceleration of different amplitudes. Active tendon control mechanism, comprised of pre-stressed tendons and an actuator, and extended nonlinear Newmark method based instantaneous optimal control algorithm have been used as active control mechanism and algorithm. To enhance the efficiency of the controllers, the weights corresponding to displacement, velocity, acceleration and control force in the performance index have been found by using the Distributed Genetic Algorithm (DGA). According to the results it has been concluded that the proposed method has been effective in considering the actuator saturation in designing optimal controllers for nonlinear frames. Also it has been shown that the actuator capacity and the average value of required control force are two important factors in designing nonlinear controllers for considering the actuator saturation.


    Access

    Download


    Export, share and cite



    Title :

    Genetic Algorithm Based Approach for Actuator Saturation Effect on Nonlinear Controllers


    Contributors:
    M. Mohebbi (author) / K. Shakeri (author)

    Publication date :

    2011-01-23


    Remarks:

    oai:zenodo.org:1059323



    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :

    DDC:    621 / 629




    Optimal Controllers with Actuator Saturation for Nonlinear Structures

    M. Mohebbi / K. Shakeri | BASE | 2010

    Free access

    Parameter Adjustment of Nonlinear Controllers via a Revised Genetic Algorithm

    Tanaka, K. / Hatanaka, S. | British Library Online Contents | 1997


    Effect of Actuator Saturation on Pilot-Induced Oscillation: A Nonlinear Bifurcation Analysis

    Nguyen, Duc H. / Lowenberg, Mark H. / Neild, Simon A. | AIAA | 2021



    Remarks on robust stability of saturation controllers

    Lim, Chae-Wook | Online Contents | 2007