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Related Concept Videos

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...

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Related Experiment Video

Updated: May 14, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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Published on: October 28, 2022

Wireless High Rotational Speed Assessment by Exploiting an RF Sensor Tag System and Equivalent-Time Reconstruction.

Armin Gharibi1, Filippo Costa1, Simone Genovesi1

  • 1Department of Information Engineering, University of Pisa, 56123 Pisa, Italy.

Sensors (Basel, Switzerland)
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a wireless impedance sensing method for rotational speed measurement. An equivalent-time sampling technique reconstructs speed data, significantly improving accuracy at high RPMs.

Keywords:
RF impedance sensingequivalent-time samplingnonuniform samplingphase-domain reconstructionrotational speed measurementsparse samplingwireless sensing

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Area of Science:

  • Electromechanical Systems Engineering
  • Radio-Frequency Sensing
  • Signal Processing

Background:

  • Accurate rotational speed monitoring is critical for industrial and electromechanical systems.
  • Traditional sampling methods for RF impedance-based rotational sensing face limitations in usable speed range due to acquisition rates.
  • Existing peak-based estimation methods exhibit significant errors at higher rotational speeds.

Purpose of the Study:

  • To present a novel rotational speed measurement method using a wireless impedance sensing system.
  • To overcome the speed range limitations of conventional sampling-based systems without requiring higher-rate instrumentation.
  • To introduce and validate an equivalent-time sampling (ETS) reconstruction approach for enhanced rotational sensing.

Main Methods:

  • Utilized a wireless impedance sensing system with radio-frequency coupling between a passive resonant tag and a coplanar waveguide (CPW) probe.
  • Exploited periodic variations in the probe's real impedance caused by the relative alignment of the rotating tag.
  • Implemented an equivalent-time sampling (ETS) approach to reconstruct the rotational waveform from sparse, nonuniform impedance samples over multiple revolutions.

Main Results:

  • Achieved rotational speed measurements from 150 RPM to 4000 RPM with a mean relative estimation error below 5%.
  • Demonstrated a significant improvement over conventional peak-based estimation, which showed errors exceeding 70% above 1000 RPM.
  • Validated the effectiveness of the ETS approach in extending the operational range of RF impedance-based rotational sensing under undersampling conditions.

Conclusions:

  • The proposed equivalent-time sampling (ETS) method effectively enhances rotational speed measurement accuracy in wireless impedance sensing systems.
  • The ETS approach overcomes fundamental limitations of sampling rates, enabling reliable sensing across a wide speed range.
  • The framework is generalizable to other periodic RF sensing applications where signal periodicity can be leveraged across multiple acquisition cycles.