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现役飞机上液压系统的工作压力大多为21 MPa,是二十世纪四十年代初期确立的,目前已满足不了未来战机的要求。下一代飞机要求降低静稳定度和提高机动性,从而导致飞行控制舵面承受的气动载荷变得更大、作动速率也更快,因而液压作动器的功率将更大;另一方面,在某些新型战斗机上,需要液压动力实现可调推力矢量控制,加之发动机控制所需的液压功率也在增长,发动机控制作动所需的液压功率总共增加50%~100%。例如在F-22战斗机上,液压系统的功率接近600kW,约为F-15战斗机液压
Most of the working pressure of hydraulic system on active aircraft is 21 MPa, which was established in the early 1940s and has not met the requirements of future fighters. The next generation of aircraft demanded to reduce static stability and improve maneuverability, resulting in larger aerodynamic loads on the flight control surface and higher operating speeds, resulting in more hydraulic actuators. On the other hand, In some new fighters, the need for hydraulic power to achieve adjustable thrust vector control, coupled with the hydraulic power required for engine control is also growing, the hydraulic control power required for engine control a total increase of 50% to 100%. For example, in the F-22 fighter aircraft, hydraulic system power close to 600kW, about F-15 fighter hydraulic