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  • 1.
    Asl, Reza Mohammadi
    et al.
    Laboratory of Intelligent Machines, Department of Mechanical Engineering, LUT University, Lappeenranta, Finland.
    Hagh, Yashar Shabbouei
    Laboratory of Intelligent Machines, Department of Mechanical Engineering, LUT University, Lappeenranta, Finland.
    Palm, Rainer
    Örebro University, School of Science and Technology.
    Handroos, Heikki
    Laboratory of Intelligent Machines, Department of Mechanical Engineering, LUT University, Lappeenranta, Finland.
    Integral Non-Singular Terminal Sliding Mode Controller for nth-Order Nonlinear Systems2019In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 102792-102802Article in journal (Refereed)
    Abstract [en]

    In this study, a new integral non-singular terminal sliding mode control method for nonlinear systems is introduced. The proposed controller is designed by defining a new sliding surface with an additional integral part. This new manifold is first introduced into the second-order system and then expanded to nth-order systems. The stability of the control system is demonstrated for both second-order and nth-order systems by using the Lyapunov stability theory. The proposed controller is applied to a robotic manipulator as a case study for second-order systems, and a servo-hydraulic system as a case study for third-order systems. The results are presented and discussed.

  • 2.
    Paul, Satyam
    et al.
    School of Engineering and Science, Tecnológico de Monterrey, Monterrey, Mexico.
    Morales-Menendez, Ruben
    School of Engineering and Science, Tecnológico de Monterrey, Monterrey, Mexico.
    Active Control of Chatter in Milling Process Using Intelligent PD/PID Control2018In: IEEE Access, E-ISSN 2169-3536, Vol. 6, p. 72698-72713Article in journal (Refereed)
    Abstract [en]

    Chatter is an obstacle for achieving high-quality machining process and high production rate in industries. Chatter is an unstable self-exciting phenomenon that leads to tool wear, poor surface finish, and downgrade the milling operations. A novel active control strategy to attenuate the chatter vibration is proposed. PD/PID controllers in combination with Type-2 Fuzzy logic were utilized as a control strategy. The main control actions were generated by PD/PID controllers, whereas the Type-2 Fuzzy logic system was used to compensate the involved nonlinearities. The Lyapunov stability analysis was utilized to validate the stability of Fuzzy PD/PID controllers. The theoretical concepts and results are proved using numerical simulations. Although PD/PID controllers have been used for chatter control in machining process, the importance of stability along with the implementation of Type-2 Fuzzy logic system for nonlinearity compensation was the main contribution. In addition, active control using an Active Vibration Damper placed in an effective position is entirely a new approach with promising practical results.

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