The invention provides a real-time on-line weight estimation method for an amphibious aircraft, which comprises the following steps of: calculating a power coefficient Cp of the aircraft through shaft power Pt, a propeller rotating speed Np and a propeller diameter D; according to the vacuum speed Vas, the propeller rotating speed Np and the propeller diameter D, the forward ratio J of the aircraft is calculated; according to a built-in engine efficiency database of the aircraft, the calculated power coefficient Cp, the forward ratio J and the barometric altitude H, obtaining the propeller efficiency eta of the aircraft 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; according to parameters such as the tension coefficient Tc, the flap skewness delta f, the flight angle alpha, the Mach number mach, the elevator skewness delta e, the aileron skewness delta a and the spoiler skewness delta s, the lift coefficient CL of the aircraft is calculated in real time; and through the normal overload nz, the velocity pressure qbar and the lift coefficient CL, the weight mass of the aircraft flying in the air is solved in real time. According to the invention, the weight of the propeller-driven aircraft can be simply, conveniently and quickly calculated in real time.
本发明提出了一种水陆两栖飞机的实时在线重量估算方法,包括:通过轴功率Pt、螺旋桨转速Np和螺旋桨直径D,计算飞机的功率系数Cp;再根据真空速Vas、螺旋桨转速Np和螺旋桨直径D,计算飞机的前进比J;根据飞机内置发动机效率数据库,计算的功率系数Cp、前进比J和气压高度H,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;根据拉力系数Tc、襟翼偏度δf、飞行迎角α、马赫数mach、升降舵偏度δe、副翼偏度δa和扰流片偏度δs等参数,实时计算飞机的升力系数CL;通过法向过载nz、速压qbar、升力系数CL,实时解算飞机在空中飞行时的重量mass。本发明可以简单、方便、快速且实时的计算螺旋桨飞机的重量。
Real-time online weight estimation method for large fire-extinguishing amphibious aircraft
一种大型灭火水陆两栖飞机实时在线重量估算方法
2022-12-30
Patent
Electronic Resource
Chinese
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