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Robust force control in a novel electro-hydraulic structure using polytopic uncertainty representation.

K Baghestan1, S M Rezaei1, H A Talebi2

  • 1Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran.

ISA Transactions
|August 28, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel hydraulic structure for electro-hydraulic servo systems (EHSS) to enhance force control and efficiency. A robust H∞ control approach addresses model uncertainties, improving system performance and stability.

Keywords:
Electro-hydraulic servo systemsForce controlPolytopic uncertainty

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Area of Science:

  • Control Engineering
  • Hydraulic Systems
  • Robotics

Background:

  • Electro-hydraulic servo systems (EHSS) are crucial for industrial position and force control.
  • Achieving precise force control in EHSS is complex, often requiring advanced algorithms and high-frequency valves.
  • Existing methods face challenges in balancing performance, efficiency, and model uncertainties.

Purpose of the Study:

  • To propose a novel hydraulic structure for EHSS to improve force tracking quality and system efficiency.
  • To develop a robust control strategy to manage linearization and uncertainty challenges in the new EHSS model.
  • To validate the effectiveness of the proposed system and control approach through experimental results.

Main Methods:

  • A new hydraulic structure for EHSS was designed and modeled.
  • Linearization uncertainties were approximated using a polytope representation.
  • A robust H∞ control design was implemented to ensure stability and performance within the defined uncertainty bounds.

Main Results:

  • The proposed hydraulic structure demonstrated improved force tracking quality and increased efficiency.
  • The robust H∞ controller successfully maintained system stability and met performance criteria despite model uncertainties.
  • Experimental validation confirmed the achievement of the study's objectives.

Conclusions:

  • The novel hydraulic structure and robust H∞ control offer a promising solution for enhancing EHSS performance.
  • This approach effectively addresses the inherent challenges of force control and model uncertainties in hydraulic systems.
  • The findings contribute to more efficient and precise industrial automation using EHSS.