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Robust versus optimal control for the radius of spherical bubble in a perfect incompressible liquid, LMI optimization approach

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Abstract

Control of the bubble radius is essential in many medical and industrial applications. In this paper, the nonlinear governing dynamic of single spherical bubble in a perfect incompressible liquid is introduced. In continuation, the state space form of the nonlinear dynamic is presented and then observability and controllability are checked by Lie derivative concepts and finally the linearized state space is obtained around its equilibrium point. Second part of this paper is devoted to designing control strategies for the nonlinear governing dynamics of bubble, where the ultrasonic pressure plays the role of control input and the output is radius of bubble which is intended to follow desired radius in order to prevent from bubble collapse phenomenon. A novel robust control is proposed to ensure the desired level of performance in the presence of parametric uncertainty. In this method, the stability of the closed loop system is guaranteed by Lyapunov theorem and the stabilizing gain is achieved by Linear Matrix Inequality (LMI) optimization approach. For comparison, Linear Quadratic Regulator method is selected which is a very classical approach. The optimal feedback gain is also achieved through LMI approach. Simulation results indicate the effectiveness and efficiency of the robust over optimal controller.

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This research does not receive any special grant from any funding agency in the public, commercial or non-profit sectors.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Qom University of Technology (QUT), Qom, Iran

    Ehsan Badfar

  2. Department of Electrical and Computer Engineering, Faculty of Shamsipour, Tehran Branch, Technical and Vocational University (TVU), Tehran, Iran

    Mahdi Alinaghizadeh Ardestani

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  1. Ehsan Badfar
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  2. Mahdi Alinaghizadeh Ardestani
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Correspondence to Ehsan Badfar.

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Badfar, E., Ardestani, M.A. Robust versus optimal control for the radius of spherical bubble in a perfect incompressible liquid, LMI optimization approach. Int. J. Dynam. Control 8, 497–507 (2020). https://doi.org/10.1007/s40435-019-00586-x

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  • DOI: https://doi.org/10.1007/s40435-019-00586-x

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