The invention provides an online sideslip angle estimation method for a large-scale fire-extinguishing amphibious aircraft. The method comprises the following steps: calculating a power coefficient Cp of the aircraft; calculating a forward ratio J of the aircraft; the propeller efficiency eta of the aircraft is obtained through interpolation; according to the shaft power Pt, the propeller efficiency eta and the vacuum speed Vas, the thrust T of the aircraft is calculated; according to the velocity pressure qbar, the wing area Sw and the aircraft thrust T, the tension coefficient Tc of the aircraft is calculated; calculating a lateral force coefficient CY of the aircraft according to a lateral force balance relational expression through the lateral overload signal ny, the online weight estimated value mass and the velocity pressure signal qbar; then, through a built-in pneumatic lateral force database, according to the tension coefficient Tc, the flap skewness delta f, the flight angle of attack alpha and the Mach number mach, lateral force pneumatic parameters CY0, CYdelta r and CYbeta of the aircraft are calculated; according to the rudder skewness signal delta r, the yaw angle speed signal r and the vacuum speed signal Vas, the sideslip angle beta of the aircraft is calculated in real time. According to the method, the sideslip angle of the propeller-driven aircraft can be simply, conveniently and quickly calculated in real time.
本发明提出了一种大型灭火水陆两栖飞机在线侧滑角估算方法,包括:计算飞机的功率系数Cp;计算飞机的前进比J;插值获得飞机的螺旋桨效率η;根据轴功率Pt、螺旋桨效率η和真空速Vas,计算飞机的推力T;根据速压qbar、机翼面积Sw和飞机推力T,计算飞机的拉力系数Tc;通过侧向过载信号ny、在线重量估算值mass和速压信号qbar,根据侧力平衡关系式计算飞机的侧力系数CY;再通过内置气动侧力数据库,根据拉力系数Tc、襟翼偏度δf、飞行迎角α、马赫数mach、计算飞机的侧力气动参数CY0、CYδr和CYβ;再根据方向舵偏度信号δr、偏航角速度信号r、真空速信号Vas,实时计算飞机的侧滑角β。本发明可以简单、方便、快速且实时的计算螺旋桨飞机的侧滑角。
Online sideslip angle estimation method for large fire extinguishing amphibious aircraft
一种大型灭火水陆两栖飞机在线侧滑角估算方法
2022-12-30
Patent
Elektronische Ressource
Chinesisch
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