Steering control of magnetic helical swimmers in swirling flows due to confinement

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Çaldağ, Hakan Osman and Yeşilyurt, Serhat (2020) Steering control of magnetic helical swimmers in swirling flows due to confinement. In: IEEE International Conference on Robotics and Automation (ICRA), Paris, France

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Official URL: http://dx.doi.org/10.1109/ICRA40945.2020.9196521


Artificial microswimmers are prospective robotic agents especially in biomedical applications. A rotating magnetic field can actuate a magnetized swimmer with a helical tail and enable propulsion. Such swimmers exhibit several modes of instability. Inside conduits, for example, hydrodynamic interactions with the boundaries lead to helical paths for pusher-mode swimmers; in this mode the helical tail pushes a rotating magnetic head. State-of-the-art in controlled navigation of microswimmers is based on aligning the swimmer orientation according to a reference path, thereby requiring both swimmer orientation and position to be known. Object-orientation is hard to track especially in in vivo scenarios which render orientationbased methods practically unfeasible. Here, we show that the kinematics for a confined swimmer can be linearized by assuming a low wobbling angle. This allows for a control law solely based on the swimmer position. The approach is demonstrated through experiments and two different numerical models: the first is based on the resistive force theory for a swimmer inside a swirling flow represented by a forced vortex and the second is a computational fluid dynamics model, which solves Stokes equations for a swimmer inside a circular channel. Helical pusher-mode trajectories are suppressed significantly for the straight path following problem. The error in real-life experiments remains comparable to those in the state-of-the-art methods.

Item Type:Papers in Conference Proceedings
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ210.2-211.47 Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General)
T Technology > TJ Mechanical engineering and machinery > TJ163.12 Mechatronics
ID Code:40089
Deposited By:Hakan Osman Çaldağ
Deposited On:18 Sep 2020 18:26
Last Modified:18 Sep 2020 18:26

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