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A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
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The Dead Time Characterization Method of Quartz Flexure Accelerometers Using Monotonicity Number.

Bin Wu1, Lingyun Ye1, Tiantian Huang2

  • 1College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou 310027, China.

Sensors (Basel, Switzerland)
|July 18, 2019
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Summary

Dead time estimation is crucial for quartz flexure accelerometers. A novel monotonicity number method accurately identifies this dead time, essential for improving accelerometer design and performance.

Keywords:
dead timequartz flexure accelerometersystem identification

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Area of Science:

  • Instrumentation and Measurement
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Dead time is a critical parameter in the design of quartz flexure accelerometers.
  • Conventional identification studies have not adequately investigated dead time in these devices.
  • Accurate dead time estimation is vital for optimizing accelerometer performance and reliability.

Purpose of the Study:

  • To propose and validate a novel method for estimating dead time in quartz flexure accelerometers.
  • To identify the open-loop transfer function parameters concurrently with dead time.
  • To address the gap in conventional identification studies regarding dead time in these accelerometers.

Main Methods:

  • A new 'monotonicity number' was developed for robust dead time estimation from step excitation experiments.
  • The least mean squares algorithm was employed to identify open-loop transfer function parameters.
  • A two-step experimental approach was utilized for comprehensive system identification.

Main Results:

  • The proposed monotonicity number demonstrated robustness against measurement noise and sensitivity to step excitation.
  • Simulation examples validated the accuracy and effectiveness of the developed identification method.
  • Experimental testing on a quartz flexure accelerometer determined a dead time of 500 μs.

Conclusions:

  • The novel monotonicity number method provides an effective and reliable approach for dead time estimation in quartz flexure accelerometers.
  • The integrated method allows for simultaneous identification of dead time and open-loop transfer function parameters.
  • This research contributes to the improved design and performance analysis of quartz flexure accelerometer systems.