Load-sensitive impedance control for resilient force balance in variable displacement electrohydrostatic actuators

Variable displacement electrohydrostatic actuators (VDEHAs) are critical in aerospace and industrial automation due to their high precision, efficiency, and power density. However, achieving resilient force balance remains a significant challenge, impacting control accuracy and stability. This study introduces a novel load-sensitive impedance control (LSIC) framework to address these issues. The proposed approach integrates data-driven mechatronic load cells for vector force feedback with model-free impedance control devices to dynamically adjust mechanical impedance – specifically, inertia, damping, and stiffness – under varying loads. Experimental results demonstrate that the LSIC/VDEHA system significantly minimizes force fluctuations, enhances actuation efficiency, and ensures smooth and stable operation. System-in-the-loop verification on aileron actuation in large flight vehicles highlights the framework’s ability to maintain resilient force balance while reducing hydraulic flow rates and pressures. This innovative method offers a promising solution for advanced mechatronic systems in aerospace, robotics, and automation, enhancing performance, safety, and energy efficiency.