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Related Experiment Video

Updated: Jun 2, 2026

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
07:32

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects

Published on: September 1, 2016

Piezoelectric multilayer actuator life test.

Stewart Sherrit1, Xiaoqi Bao, Christopher M Jones

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. ssherrit@jpl.nasa.gov

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|April 22, 2011
PubMed
Summary
This summary is machine-generated.

Commercial piezoelectric actuators demonstrate reliability for NASA

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Area of Science:

  • Aerospace Engineering
  • Materials Science
  • Mechanical Engineering

Background:

  • NASA's Space Interferometry Mission (SIM) requires actuators for nanometer-precision positioning.
  • Commercially available multilayer piezoelectric stack actuators are candidates for these critical mechanisms.
  • Mission operational requirements exceed 5 years, necessitating high reliability and redundancy.

Purpose of the Study:

  • To assess the feasibility and reliability of commercial piezoelectric actuators for long-duration space missions.
  • To determine redundancy requirements for actuators used in precision positioning mechanisms.
  • To evaluate actuator performance over an extended operational lifespan equivalent to mission requirements.

Main Methods:

  • A life test study was conducted on commercial PZT stacks configured in a flight actuator setup.
  • Actuators were pre-stressed and bonded in flexures, with primary and redundant stacks in series.
  • Accelerated testing involved driving stacks to 100 billion cycles at 2000 Hz, monitoring stroke, temperature, voltage, and current.

Main Results:

  • Average stroke degradation was minimal (<3% for primary, <4% for redundant stacks) over 100 billion cycles.
  • Approximately half of the stroke reduction occurred within the first 10 billion cycles.
  • A significant portion of lost stroke could be recovered by applying a 100 V DC voltage.

Conclusions:

  • Commercial piezoelectric actuators show promising reliability for long-duration space missions like SIM.
  • The study provides data to inform redundancy requirements for these critical components.
  • Further investigation into stroke recovery mechanisms may enhance actuator longevity and performance.