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Updated: Jun 18, 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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Output feedback-based adaptive position control for hydraulic systems with preset performance.

Xiaowei Yang1, Yaowen Ge1, Weilin Zhu1

  • 1School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

ISA Transactions
|June 16, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces adaptive control for hydraulic systems, ensuring performance within a specified time despite unknown parameters. The method guarantees tracking error convergence, validated by experiments.

Keywords:
Command filtered controlHydraulic systemOutput feedbackSpecified-time performanceUnknown time-varying uncertainties

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Area of Science:

  • Control Engineering
  • Hydraulic Systems
  • Adaptive Control Theory

Background:

  • Hydraulic systems often face challenges with unknown time-variant parameters and external disturbances.
  • Achieving precise control with guaranteed performance within a specific timeframe is crucial for these systems.

Purpose of the Study:

  • To develop an adaptive output feedback controller for hydraulic systems.
  • To ensure specified-time performance despite unknown system parameters and disturbances.
  • To address the complexity explosion issue in controller design.

Main Methods:

  • Utilizing a state observer to estimate unmeasurable states from position feedback.
  • Designing an adaptive output feedback controller incorporating command filter and specified-time performance functions.
  • Employing theoretical analysis to prove convergence properties.

Main Results:

  • The proposed controller effectively handles unknown time-varying parameters and disturbances.
  • The tracking error is guaranteed to remain within a predefined bound.
  • The tracking error converges to a specified region within a specified time.

Conclusions:

  • The developed adaptive control strategy achieves specified-time convergence for hydraulic systems.
  • The method offers a robust solution for complex control problems in hydraulic applications.
  • Experimental validation confirms the effectiveness and advantages of the proposed approach.