The Experts below are selected from a list of 43671 Experts worldwide ranked by ideXlab platform

Juntao Fei - One of the best experts on this subject based on the ideXlab platform.

  • Adaptive neural nonsingular terminal sliding mode control for MEMS gyroscope based on dynamic surface controller
    International Journal of Machine Learning and Cybernetics, 2017
    Co-Authors: Dandan Lei, Juntao Fei
    Abstract:

    A novel adaptive dynamic surface control (DSC) method for the micro-electromechanical systems gyroscope, which combined the approaches of a radial basis function neural networks (RBFNN) and a nonsingular terminal sliding mode (NTSM) controller was proposed in this paper. In the DSC, a First-Order Filter was introduced to the conventional adaptive backstepping technique, which not only maintains the advantage of original backstepping technique, but also reduces the number of parameters and avoids the problem of parameters expansion. The RBFNN is an approximation to the gyroscope’s dynamic characteristics and external disturbances. By introducing a nonsingular terminal sliding mode controller which ensuring the control system could reach the sliding surface and converge to equilibrium point in a finite period of time from any initial state. Finally, simulation results prove that the proposed approach could reduce the chattering of inputs, improve the timeliness and effectiveness of tracking in the presence of model uncertainties and external disturbances, demonstrating the excellent performance compared to nonsingular terminal sliding mode control (NTSMC).

Christine Lefrou - One of the best experts on this subject based on the ideXlab platform.

  • new concept for a potentiostat for on line ohmic drop compensation in cyclic voltammetry above 300 kv s 1
    Journal of Electroanalytical Chemistry, 1992
    Co-Authors: Christian Amatore, Christine Lefrou
    Abstract:

    A new concept for a potentiostat is presented for ohmic drop compensation in submicrosecond cyclic voltammetry. Theory and simulations of the potentiostat allow the prediction of most of its characteristics, which are then confirmed experimentally on dummy cells. Reduction of anthracene in acetonitrile is examined as a test experimental case. It is thus shown that the potentiostat affords perfectly ohmic drop corrected voltammograms up to scan rates exceeding 300 kV s−1. If the data are corrected further to eliminate the slight constant potential shift due to Filtering by the potentiostat (First-Order Filter correction), scan rates exceeding 0.5 MV s−1 are achievable without distortion.

  • New concept for a potentiostat for on-line ohmic drop compensation in cyclic voltammetry above 300 kV s−1
    Journal of Electroanalytical Chemistry, 1992
    Co-Authors: Christian Amatore, Christine Lefrou
    Abstract:

    A new concept for a potentiostat is presented for ohmic drop compensation in submicrosecond cyclic voltammetry. Theory and simulations of the potentiostat allow the prediction of most of its characteristics, which are then confirmed experimentally on dummy cells. Reduction of anthracene in acetonitrile is examined as a test experimental case. It is thus shown that the potentiostat affords perfectly ohmic drop corrected voltammograms up to scan rates exceeding 300 kV s−1. If the data are corrected further to eliminate the slight constant potential shift due to Filtering by the potentiostat (First-Order Filter correction), scan rates exceeding 0.5 MV s−1 are achievable without distortion.

M Chidambaram - One of the best experts on this subject based on the ideXlab platform.

  • enhanced smith predictor for unstable processes with time delay
    Industrial & Engineering Chemistry Research, 2005
    Co-Authors: M Chidambaram
    Abstract:

    In this paper, a modified form of Smith predictor is proposed for unstable processes with time delay. A Smith predictor structure is incorporated separately for servo and regulatory problems, and an additional controller is added to improve disturbance rejection. Analytical formulas are given for the design of controllers. The proposed method has only one tuning parameter. A First-Order Filter is used to achieve good robustness for uncertainties in process parameters. The designed controllers give good set-point tracking and disturbance rejection. Quantitative improvements are given and compared to the previous methods. Illustrative examples are given to show the advantages of the proposed method.

Dandan Lei - One of the best experts on this subject based on the ideXlab platform.

  • Adaptive neural nonsingular terminal sliding mode control for MEMS gyroscope based on dynamic surface controller
    International Journal of Machine Learning and Cybernetics, 2017
    Co-Authors: Dandan Lei, Juntao Fei
    Abstract:

    A novel adaptive dynamic surface control (DSC) method for the micro-electromechanical systems gyroscope, which combined the approaches of a radial basis function neural networks (RBFNN) and a nonsingular terminal sliding mode (NTSM) controller was proposed in this paper. In the DSC, a First-Order Filter was introduced to the conventional adaptive backstepping technique, which not only maintains the advantage of original backstepping technique, but also reduces the number of parameters and avoids the problem of parameters expansion. The RBFNN is an approximation to the gyroscope’s dynamic characteristics and external disturbances. By introducing a nonsingular terminal sliding mode controller which ensuring the control system could reach the sliding surface and converge to equilibrium point in a finite period of time from any initial state. Finally, simulation results prove that the proposed approach could reduce the chattering of inputs, improve the timeliness and effectiveness of tracking in the presence of model uncertainties and external disturbances, demonstrating the excellent performance compared to nonsingular terminal sliding mode control (NTSMC).

K. Hui - One of the best experts on this subject based on the ideXlab platform.

  • Design of stable actuator saturation compensators in the frequency domain
    IEE Proceedings - Control Theory and Applications, 1998
    Co-Authors: C.w. Chan, K. Hui
    Abstract:

    An important practical control problem is the compensation for actuator saturation. Many saturation compensation techniques, widely known as antiwindup schemes, have been proposed, but few guidelines for the design of these techniques are available. Here, frequency domain methods for the design of a class of general saturation compensators are proposed. It is shown that the design of saturation compensators simply reduces to the design of a First Order Filter. Two methods, the phase shift method and the gain reduction method, are proposed to design the First Order Filter. The choice between these two methods depends on the shape of the frequency response of the system. An example is presented to illustrate the performance of the proposed methods. Although the proposed design methods are relatively simple, it is shown in the example that they may perform as good as, if not better than, the computational more complex ‘optimal’ controller that includes actuator saturation in its design, and that they are also more robust as actuator saturation becomes more severe.

  • Design of Actuator Saturation Compensators Based on Phase Angle Specification
    IFAC Proceedings Volumes, 1996
    Co-Authors: C.w. Chan, K. Hui
    Abstract:

    Abstract A general compensator has been proposed by incorporating into the controller a term involving the un-implementable control. Using effective set-points, compensators can be designed iteratively. In this paper, another design procedure, by shifting the Nyquist plot of the equivalent system so that the sufficient condition for stability be satisfied, is presented. Such a design technique chooses a First Order Filter, and is a oneshot process in that the parameters are readily computed for a given phase angle shift. Examples are presented to illustrate the design procedure.