H. Hu

Publications (6)5.73 Total impact

• Source

  Available from: hitsz.edu.cn

  Article: Enhancement of tracking ability in piezoceramic actuators subject to dynamic excitation conditions

  H. Hu, H.M.S. Georgiou, R. Ben-Mrad
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  ABSTRACT: An operator representing the inverse dynamics of hysteretic effects inherent to piezoceramic actuators is used to enhance the tracking accuracy of a piezoceramic-driven positioning system when subject to dynamic reference input signals covering a wide frequency range. An open-loop tracking controller and a closed-loop tracking controller are developed based on the new inverse algorithm and are experimentally shown to achieve high-accuracy tracking control.
  IEEE/ASME Transactions on Mechatronics 05/2005; · 2.87 Impact Factor
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  Available from: hitsz.edu.cn

  Article: A model for voltage-to-displacement dynamics in piezoceramic actuators subject to dynamic-voltage excitations

  R. Ben Mrad, H. Hu
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  ABSTRACT: A model that predicts the expansion of piezoceramic actuators when subject to dynamic-voltage excitations is developed as an extension of the classical Preisach model. The model is presented in a recursive form that is suitable for real-time implementation. The model uses measurements of the first-order reversal curves and the average rate of change of the input-voltage signal. The model is shown through experiments to offer high accuracy under voltage excitations covering a wide frequency band.
  IEEE/ASME Transactions on Mechatronics 01/2003; · 2.87 Impact Factor
• Article: -109 Preisach Modeling Of Hysteresis In A Piezoceramic Actuator

  H. Hu, R. Ben Mrad
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  ABSTRACT: A Preisach model that captures hysteresis in a stacked piezoceramic actuator is developed and experimentally validated. The Preisach model is implemented using a numerical technique that is based on first order reversal functions. These first order reversal functions are experimentally obtained from a piezoceramic actuator in a stacked form. The model shows good agreement with actual measured data. INTRODUCTION Piezoceramic materials generate an electric potential when deformed, and also deform in the presence of an external electric field. Because of these properties, piezoceramic materials have found numerous applications including applications as actuators and sensors. Piezoceramic based actuators are increasingly used in high precision position control applications, because of their nanometers displacement resolution, high stiffness and fast frequency response. Piezoceramic actuators exhibit material specific nonlinearities in their response to 1 Please address all correspondence ...
  03/2000;
• Article: -039 Preisach Modeling Of Hysteresis In A Piezoceramic Actuator

  H. Hu, R. Ben Mrad
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  ABSTRACT: A Preisach model that captures hysteresis in a stacked piezoceramic actuator is developed and experimentally validated. The Preisach model is implemented using a numerical technique that is based on first order reversal functions. These first order reversal functions are experimentally obtained from a piezoceramic actuator in a stacked form. The model shows good agreement with actual measured data. INTRODUCTION Piezoceramic materials generate an electric potential when deformed, and also deform in the presence of an external electric field. Because of these properties, piezoceramic materials have found numerous applications including applications as actuators and sensors. Piezoceramic based actuators are increasingly used in high precision position control applications, because of their nanometers displacement resolution, high stiffness and fast frequency response. Piezoceramic actuators exhibit material specific nonlinearities in their response to 1 Please address all correspondence...
  03/2000;
• Source

  Available from: sys.hitsz.edu.cn

  Article: On the classical Preisach model for hysteresis in piezoceramic actuators

  H. Hu, R. Ben Mrad
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  ABSTRACT: A classical Preisach model [Mathematical Models of Hysteresis, Springer, New York, 1991] is developed using a piezoceramic actuator in a stacked form. The classical Preisach model is shown to offer excellent modeling accuracy when the actuator is not subject to any load and is subject to an excitation voltage signal at a low frequency. The accuracy of the Preisach model is shown to increasingly deteriorate as the load being applied to the piezoceramic actuator is increased or the range of frequencies contained in the voltage excitation signal gets wider. The classical Preisach model remains, though, a good model for hysteresis in piezoceramic actuators in applications where the load fluctuation is relatively small and the range of frequencies of the voltage excitation is limited.
  Mechatronics.
• Source

  Available from: sys.hitsz.edu.cn

  Article: A discrete-time compensation algorithm for hysteresis in piezoceramic actuators

  H. Hu, R. Ben Mrad
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  ABSTRACT: A discrete-time Preisach model that captures hysteresis in a piezoceramic actuator is developed. The model is implemented using a numerical technique that is based on first-order reversal functions and is presented in a recursive form that is amenable for real-time implementation. The first-order reversal functions are experimentally obtained using a piezoceramic actuator in a stacked form. The developed model shows good agreement with actual measured data. Two hysteresis compensation schemes based on the developed discrete-time Preisach model are also developed and used in order to obtain any desired linear voltage-to-displacement relationship. The ability of the first hysteresis compensator to lead to an arbitrary linear voltage-to-displacement relationship is shown through experimental tests under the condition that no-load is applied to the actuator and then a load typical of many piezoactuator applications is applied to the actuator. The second hysteresis compensation scheme is used as part of an open-loop tracking controller and is shown experimentally to lead to high tracking accuracy.
  Mechanical Systems and Signal Processing.