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Adaptive under-actuated control for capacitive micro-machined ultrasonic transducer based on an accurate nonlinear modeling

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Abstract

A capacitive micromachined ultrasonic transducer (CMUT) due to many benefits is being considered as an imaging and therapeutic technology recently. The critical challenge is to stabilize the system beyond the pull-in voltage considering imposed perturbations. The CMUT system, on the other hand, has a low range of movement and it is intrinsically unstable, which can result in a pull-in phenomenon. Consequently, in order to use the CMUT systems in a variety of medical applications that require high tuning ratio, a closed-loop control technique has been designed for these systems aims at increasing the maximum capacitance and enhancing tunability as well. In this study, using the closed-loop control, the resistance of micro-plate against the pull-in phenomenon has been examined. Also, in the description of the system a more accurate nonlinear modeling has been considered in the presence of an under-actuated sliding model control strategy with finite convergence time. Besides, adaptive protocols with unknown upper bounds have been designed to compensate the effects of uncertainty, unmodeled dynamics and external disturbances. The performance of controller in terms of improving output pressure, stabilizing the CMUT and its robustness to imposed perturbations have been investigated. Finally, numerical simulations are presented to verify the usefulness and applicability of the proposed control strategy.

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Authors and Affiliations

  1. Department of Electrical Engineering, Urmia University, Urmia, Iran

    Sima Darbasi

  2. Faculty of Electrical & Computer Engineering, University of Tabriz, Tabriz, Iran

    Mohammad Javad Mirzaei

  3. Department of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran

    Amir Musa Abazari & Ghader Rezazadeh

  4. South Ural State University, Lenin Prospect 76, Chelyabinsk, Russian Federation, 454080

    Ghader Rezazadeh

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  1. Sima Darbasi
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Correspondence to Amir Musa Abazari.

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Darbasi, S., Mirzaei, M.J., Abazari, A.M. et al. Adaptive under-actuated control for capacitive micro-machined ultrasonic transducer based on an accurate nonlinear modeling. Nonlinear Dyn 108, 2309–2322 (2022). https://doi.org/10.1007/s11071-022-07330-9

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