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Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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Note: Pseudo-charge-driver for grounded piezoelectric actuators with high linearity.

Liansheng Zhang1, Jie Zhang1, Zhihua Feng1

  • 1Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, China.

The Review of Scientific Instruments
|April 3, 2014
PubMed
Summary

This study introduces a novel method for linear high-voltage driving of piezoelectric actuators using a mirror actuator. This technique achieves less than 1% nonlinearity, enhancing precision control for piezoelectric devices.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Mechanical Engineering

Background:

  • Piezoelectric actuators are crucial for precision motion control.
  • Achieving linear displacement with high voltage driving remains a challenge.
  • Existing methods may suffer from nonlinearity and complex control.

Purpose of the Study:

  • To propose and validate a new method for linear high-voltage driving of grounded piezoelectric actuators.
  • To demonstrate high linearity in piezoelectric actuator displacement using a mirror actuator technique.
  • To reduce the inherent nonlinearity in piezoelectric actuator response.

Main Methods:

  • A mirror actuator configuration was employed, with one actuator as a reference (charge drive) and the other as the target (voltage drive).
  • Identical voltages were applied to both the reference and target piezoelectric actuators.
  • Two similar piezoelectric stacks were utilized to experimentally verify the proposed method.

Main Results:

  • Both reference and target actuators exhibited excellent linearity between control voltage and displacement.
  • The target actuator's displacement showed a linear relationship with the applied control voltage.
  • The overall raw nonlinearity of the target actuator's displacement was measured to be less than 1%.

Conclusions:

  • The proposed mirror actuator method effectively achieves linear high-voltage driving of piezoelectric actuators.
  • This technique significantly mitigates nonlinearity issues in piezoelectric actuation.
  • The findings offer a promising approach for high-precision piezoelectric applications.