Flow pulsation compensation based composite adaptive active disturbance rejection control for electro-hydrostatic...

Area of Science:

• Control Systems Engineering
• Fluid Power Systems
• Robotics

Background:

• Plunger pumps in electro-hydrostatic actuators (EHAs) exhibit flow pulsation deviating from theoretical values due to residual pressure.
• Existing linear compensation methods for EHA flow pulsation are inadequate, leading to uncertainties and noise amplification.
• This limits the achievable control performance in EHA systems.

Purpose of the Study:

• To develop an advanced control strategy for EHAs that accurately compensates for nonlinear flow pulsation.
• To address the limitations of current control methods in handling flow deviations and parameter uncertainties.

Main Methods:

• Proposed a composite adaptive disturbance rejection control method for EHAs.
• Modeled pump flow pulsation as a combination of theoretical pulsation and a bounded disturbance term.
• Designed a composite adaptive law for parameter uncertainties and expanded state observers using position and pressure signals for nonlinear compensation.

Main Results:

• The proposed method effectively estimates and compensates for nonlinear uncertainties in EHA flow pulsation.
• Experimental comparisons demonstrate the superiority of the proposed method over existing control strategies.
• Improved control performance and reduced matching uncertainties were achieved.

Conclusions:

• The composite adaptive disturbance rejection control method offers a robust solution for EHA flow pulsation compensation.
• This approach enhances control accuracy and system performance by addressing nonlinearities and uncertainties.
• The findings are crucial for advancing precision control in fluid power applications.