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A Novel Friction Compensation Method for Machine Tool Drive Systems in Insufficient Lubrication.

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Summary

This study introduces a novel nonlinear friction model to enhance tracking accuracy in CNC machine tools. The new model significantly reduces tracking errors, improving machining quality by addressing limitations in existing friction compensation methods.

Keywords:
friction feedforward compensationfriction lagnonlinear friction modelperiodic harmonic component

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Area of Science:

  • Mechanical Engineering
  • Control Systems
  • Tribology

Background:

  • Friction significantly impacts tracking accuracy and surface quality in machine tool feed-drives.
  • Existing friction models often fail to capture complex behaviors under insufficient lubrication or high dynamic conditions.

Purpose of the Study:

  • To develop and validate a new nonlinear friction model for improved tracking control in CNC machine tools.
  • To address limitations of conventional models in pre-sliding, low-speed, and dynamic operational regimes.

Main Methods:

  • Proposed a novel nonlinear friction model incorporating Coulomb-Viscous friction, a nonlinear periodic harmonic term for lead screw properties, and an acceleration-dependent component.
  • Conducted experimental comparisons between the proposed model and conventional friction models for performance evaluation.

Main Results:

  • The proposed friction model demonstrated superior performance in friction compensation.
  • Significant reductions in root mean square and maximum absolute tracking errors were achieved.

Conclusions:

  • The new nonlinear friction model effectively compensates for friction, leading to enhanced tracking accuracy and machining surface quality.
  • This model offers a more comprehensive approach to friction compensation in demanding CNC machine tool applications.