Zhou Huixing

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    Micro-positioning of linear piezoelectric motors based on a learning nonlinear PID controller
    (2000) Zhou, H.; Tan, K.K.; Lee, T.H.; ELECTRICAL ENGINEERING
    In this paper, a learning nonlinear PID controller is developed for vaguely modeled nonlinear systems under significant disturbance and noise. The control scheme is generic in nature, but it is applied specifically to micro positioning of linear piezoelectric motors in this paper. Mathematical models for the piezoelectric motor and the associated friction phenomenon are provided and verified in the simulation and experimental results provided. These results also highlight the good motion control performance achieved from the control scheme.
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    Publication
    Micro-positioning of linear-piezoelectric motors based on a learning nonlinear PID controller
    (2001-12) Tan, K.K.; Lee, T.H.; Zhou, H.X.; ELECTRICAL & COMPUTER ENGINEERING
    In this paper, a learning nonlinear proportional integral derivative (PID) controller is developed for vaguely modeled nonlinear systems under the influence of significant disturbance and noise. The control scheme is generic in nature, but it is applied specifically to the micropositioning of linear-piezoelectric motors in this paper. The design of the control scheme does not require a full mathematical model of the nonlinear system. Simulation and experimental results are provided to highlight the good motion control performance achieved from the control scheme.
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    Publication
    New interpolation method for quadrature encoder signals
    (2002-10) Tan, K.K.; Zhou, H.X.; Lee, T.H.; ELECTRICAL & COMPUTER ENGINEERING
    This paper presents a new interpolation method suitable for increasing the measurement resolution obtainable from quadrature encoder signals. Based on the existing sinusoidal signals, high-order sinusoids can be derived, from which binary pulses can be generated, which can be decoded using only standard servo controllers for position information. A look-up table, constructed off-line, serves as the inferencing engine for the proposed method. Imperfections in the encoder signals can be directly compensated for in the look-up table, including mean and phase offsets, amplitude difference, and waveform distortion. Simulation and experimental results are provided in this paper.
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    Speed non-circular piston turning using extracted Computer Numerical Control (CNC) approach high
    (2004) Zhou, H.X.; Tan, K.K.; ELECTRICAL & COMPUTER ENGINEERING
    Non-circular pistons are becoming increasingly popular in internal combustion engines as they facilitate the construction of a more efficient engine. However, at the moment, it is still a very expensive and time consuming procedure to cut non-circular pistons, owing to practical problems which have yet to be overcome. This paper will examine these problems and highlight the principles of an Extracted Computer Numerical Control (ECNC) solution which can be used on existing Computer Numerical Control (CNC) machines. Test results on an emulated system will be furnished. © 2004IEEE.