To improve the airfield performance, the aircraft landing gear is gradually developed to use the fly-by-wire system at present. To meet the demand for the motion with low speed and large angle, and the large steering moment, most of the modern large civil aircraft are equipped with dual actuator nose wheel steering system. Aiming at the dual actuator nose wheel steering system with fly-by-wire on large civil aircraft, a swivel selector valve is firstly designed to meet the demand for the hydraulic power corn-mutating as soon as the dual actuator nose wheel steering mechanism passing through its dead center position, then based on the steering and operating demand of the dual actuator nose wheel steering system, a nose -wheel steering electro-hydraulic servo system is designed, which has the functions of steering with large angle and low speed by hand wheel, steering with small angle and high speed, and anti-shimmy. For the verification of the system steering and shimmy damping function, its simulation model is established to make dynamic simulation analysis, whose results indicate that the nose wheel steering system can meet the requirements of the general project.%为了提高飞机起降性能,当前飞机起落架逐步发展为采用电传操纵技术.而为了满足对低速大转角机动和大转弯力矩的要求,现代大部分大型民机都装配了双作动筒式前轮转弯系统.本文以大型民机的双作动筒式电传前轮转弯操纵系统为研究对象,针对双作动筒式前轮转弯机构设计一种随动转阀式换向阀,以满足其在死点位置时液压源换向的要求；随后基于双作动筒式前轮转弯系统对操纵控制的要求,设计了集手轮低速大角度转弯、脚蹬快速小角度转弯以及减摆功能于一体的飞机前轮操纵电液伺服系统,并建立仿真模型,进行动态仿真分析,以检验系统的各项功能.仿真结果表明,系统能够满足工程使用的要求.
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