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Compound Velocity Synchronizing Control Strategy for Electro-Hydraulic Load Simulator and Its Engineering

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A novel velocity synchronizing compensation strategy effectively eliminates motion disturbances in electro-hydraulic load simulators. This method enhances tracking accuracy under large loads without needing velocity or acceleration signals, proving superior to traditional methods.

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Area of Science:

  • Control Systems Engineering
  • Hydraulic Systems
  • Robotics

Background:

  • Electro-hydraulic load simulators (EHLS) are susceptible to strong external disturbances from hydraulic motion systems, impacting torque control accuracy.
  • Existing methods like structure invariance and traditional velocity synchronizing compensation (TVSM) have limitations, such as requiring velocity/acceleration signals or performing poorly under large loads.

Purpose of the Study:

  • To propose and validate a new velocity synchronizing compensation strategy for EHLS to eliminate motion disturbances.
  • To develop a method that avoids reliance on velocity and acceleration signals and improves performance in large loading conditions.
  • To provide practical implementation guidelines through compensation parameter selection rules.

Main Methods:

  • Theoretical and experimental analysis of structure invariance and TVSM.
  • Development of a new velocity synchronizing compensation strategy utilizing servo-valve control signals and torque feedback.
  • Comparative analysis using a closed-loop proportional-integral-derivative (PID) controller, TVSM, and the proposed strategy in an EHLS.

Main Results:

  • The proposed strategy effectively eliminates motion disturbances in EHLS.
  • It achieves more accurate velocity synchronizing compensation under large loading conditions compared to TVSM.
  • Experimental results confirm improved tracking accuracy and robustness against disturbances.

Conclusions:

  • The novel velocity synchronizing compensation strategy offers a more accurate and robust solution for controlling EHLS with strong external disturbances.
  • The strategy's ability to avoid velocity/acceleration signal requirements and its effectiveness in large load conditions make it suitable for engineering applications.
  • The proposed parameter selection rules facilitate practical implementation without requiring precise system parameter information.