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Experimental Research on Fluid Coupling Flexible Actuator.

Xiangli Zeng1, Yue Wu2, Qianjin Tu3

  • 1College of Mechanical Science and Engineering, Jilin University, Changchun 130025, China. xlzeng17@mails.jlu.edu.cn.

Micromachines
|November 15, 2018
PubMed
Summary

Researchers developed a fluid coupling flexible actuator to overcome micrometer displacement limitations in piezoelectric actuators. This novel design amplifies displacement 21 times using resonance, enabling practical micromechanics applications.

Keywords:
displacement amplificationflexible actuatorflexible diaphragmfluid-solid couplingpiezoelectric

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Area of Science:

  • Micromechanics
  • Actuator Technology
  • Fluid Dynamics

Background:

  • Piezoelectric actuators offer high-frequency response, resolution, and force, but are limited by small displacements.
  • Micrometer-scale displacements hinder practical applications in micromechanics.

Purpose of the Study:

  • To propose and analyze a fluid coupling flexible actuator that enhances output displacement.
  • To investigate the use of resonance to amplify displacement in a piezoelectric-driven system.

Main Methods:

  • Mathematical formulation of membrane vibration theory for an inviscid, incompressible fluid.
  • Design and fabrication of a prototype fluid coupling flexible actuator.
  • Experimental analysis of displacement amplification and resonance frequencies.

Main Results:

  • The prototype achieved a 21-fold displacement amplification to 1.106 mm at a driving frequency of 127 Hz.
  • Maximum displacement output occurred near the system's natural frequencies.
  • Observed higher-order resonance frequencies with specific nodal patterns (zero amplitude circles) and out-of-phase diaphragm movements.

Conclusions:

  • The fluid coupling flexible actuator effectively overcomes displacement limitations of traditional piezoelectric actuators.
  • Theoretical analysis aligns with experimental results, validating the design principles.
  • The system demonstrates potential for enhanced displacement in micromechanical devices through controlled resonance.