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Measurements error propagation and its sensitivity analysis in the aero-engine multistage rotor assembling process.

Maowei Zhang1, Yongmeng Liu1, Chuanzhi Sun1

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Summary
This summary is machine-generated.

This study introduces a new method to analyze measurement errors in aero engine rotor assembly equipment. Linear guide alignment and verticality errors are key issues impacting precision, requiring improvements for better accuracy.

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Area of Science:

  • Mechanical Engineering
  • Aerospace Engineering
  • Metrology

Background:

  • Accurate measurement and assembly are critical for aero engine multistage rotors.
  • Existing methods may not fully capture error propagation in complex measurement equipment.
  • Understanding error sources is vital for enhancing assembly precision.

Purpose of the Study:

  • To research the principle of measurement error propagation in aero engine multistage rotor measurement-assembly equipment.
  • To analyze the influence of linear and rotational motion on final alignment errors.
  • To improve the measurement and assembly accuracy of aero engine multistage rotors.

Main Methods:

  • Established measurement equipment topology using multibody system theory.
  • Constructed error propagation paths via low-order body sorting.
  • Developed error transfer models for linear and rotational motion using homogeneous coordinate transformation matrices.
  • Calculated total measurement terminal errors and performed numerical simulations.
  • Conducted sensitivity analysis to identify key error sources.

Main Results:

  • Quantified measurement terminal offset errors through numerical simulation.
  • Demonstrated that linearity and angular errors significantly impact cumulative offset displacement.
  • Identified linear guide alignment error and verticality error as primary error sources.
  • Simulation showed a 97% probability of a -0.1002 μm to -0.0998 μm cumulative offset displacement error with 0.1 μm linearity and 0.1″ angular errors.

Conclusions:

  • Measurement accuracy is dependent on both sensor accuracy and measurement-assembly equipment precision.
  • Linear guide alignment and verticality errors are the most significant contributors to final alignment errors.
  • Improvements in the angular accuracy of the turntable are necessary to enhance overall measurement and assembly accuracy.