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Errors in taping arise from multiple factors that can significantly impact measurement accuracy in surveying. Misalignment of the tape, often due to human error, is one primary source. A skilled rear tapeman, using a telescope, can help correct alignment by guiding the head tapeman; however, human limitations still lead to small inaccuracies. These errors may include misplacement of pins or inaccurate tape readings due to common visual confusions, such as mistaking a six for a nine. Such...
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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
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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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Analysis of Main Error Sources for the Error Motion Measurement of a Precision Shafting Using a T-Type Capacitive

Kui Xiang1, Wen Wang2, Zichen Chen1

  • 1Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China.

Micromachines
|February 25, 2022
PubMed
Summary

This study investigates error sources in precision shafting measurement using T-type capacitive sensors. It proposes methods to reduce modeling and fringe effect errors, finding installation errors have minimal impact on radial displacement and rotor tilt measurements.

Keywords:
capacitive sensorerror sources analysisprecision shafting

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Area of Science:

  • Mechanical Engineering
  • Metrology
  • Sensor Technology

Background:

  • Precision shafting is crucial for rotary functional units.
  • Accurate measurement of error motions is necessary for quality control.
  • T-type capacitive sensors are used for high-precision measurements.

Purpose of the Study:

  • Investigate main error sources in precision shafting error motion measurement using T-type capacitive sensors.
  • Analyze theoretical modeling errors and fringe effects.
  • Evaluate the impact of electrode installation errors.

Main Methods:

  • Theoretical modeling of output capacitance expressions.
  • 3D Finite Element Analysis (FEA) for fringe effects.
  • Mathematical modeling and numerical simulation for installation errors (tilt and coaxiality).

Main Results:

  • Methods proposed to decrease approximate and nonlinear errors from fringe effects.
  • Cylindrical electrode tilt error minimally affects radial displacement, especially below 0.1 mm.
  • Fan-shaped electrode coaxiality error has negligible impact on rotor tilt displacement measurement.

Conclusions:

  • Understanding and mitigating error sources are key for accurate precision shafting measurement.
  • Proposed methods enhance the reliability of T-type capacitive sensor measurements.
  • Installation errors have limited influence within specific parameters, simplifying measurement protocols.