Control Technology of Master-Master Working Mode for Advanced Aircraft Dual-Redundancy Electro-Hydrostatic Flight Control Actuation System

In response to the requirements of advanced aircraft actuation systems for high reliability, high dynamic response, and high-precision control, this paper focuses on the control technology for the master-master working mode of dual-redundancy electro-hydrostatic actuation systems(EHAs). By establishing a multi-domain coupling model that incorporates motor magnetic circuit saturation, hydraulic viscosity-temperature characteristics, and mechanical clearances, a current loop decoupling technique based on vector control is designed. Additionally, adaptive sliding mode control(ASMC) and an improved active disturbance rejection control(ADRC) are combined to enhance the robustness of the speed loop and the disturbance rejection ability of the position loop, respectively. Through the development of a dual-redundancy dynamic model that accounts for hydraulic coupling characteristics, a two-level cooperative control strategy of "position synchronization-current balancing" based on the cross-coupling control(CCC) strategy is proposed to address the challenges of synchronous error accumulation and uneven load distribution in the master-master mode. Experimental results indicate that the control error of the position loop is less than ±0.02 mm, and the load distribution accuracy is improved to over 97%, meeting the design requirements of advanced aircraft. The research findings provide key technical support for the engineering application of power-by-wire flight control systems in advanced aircraft.