Modelling and simulation of a novel dual-redundancy electro-hydrostatic actuator

The proposed paper deals with the problem of modelling and simulation of a dual-redundancy Electro-Hydrostatic Actuator (DREHA) by the way of co-simulation based on AMESim and MATLAB. With the development of More Electric Aircraft (MEA) technology, integrated Power-by-Wire (PBW) actuator will be used in the airborne actuation system. As an important PBW actuation system, EHA has virtues of high efficiency, little heat generation, easy structure integration design, effortless parallel redundancy design, convenient power distribution and management, few installation restriction, control-configured layout, and expediently implementing lock and isolation, which are more suitable to the actual technology development level and airborne requirements. The research of DREHA has a vital significance to improve the reliability of its use in aircraft. The schematic of a novel DREHA are firstly given based on the existing fault tolerant EHA architectures, and its principle is analyzed in detail. Then, build the model of control and motor part in MATLAB, and the model of hydraulic part in AMESim. Analyze the operating modes of DREHA, including active/active and active/passive mode. Finally, co-simulate the dynamic response and operating modes of DREHA based on AMESim and MATLAB. The simulation results show that this new DREHA has the ability of no performance degradation after the first failure and safe after the second failure.