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- W2321485725 abstract "Longitudinal short-period flying qualities boundaries are defined in terms of parameters of the closed-loop pilot-airplane system. The parameters are varied to match analytical boundaries to several experimental flying qualities boundaries. Parameter values which provide matching are compared to values assumed good in previous analyses of a similar nature. The analytical and experimental boundaries agree well and provide a means for experimentally determining good parameter values. It is concluded that there is an upper bound on short-period frequency for good flying qualities and that pilots accept lower values of closed-loop damping ratio than those previously assumed to be acceptable. Nomenclature AQ = numerator polynomial coefficient in pitch-elevato r transfer function g — acceleration due to gravity Gc = controlled element transfer function Gp = pilot linear transfer function i = imaginary unit ,(—!)* Kp = pilot gain Lx = variation of lift, Z,, with angle of attack, a MI = variation of pitching moment, M, with input or motion quantity, / q = pitching velocity s = Laplace transform variable T02 = pitch angle-elevator transfer function numerator time constant x, y = Cartesian coordinates in the complex plane, z = x -f iy Zw = variation of Z-direction force with vertical velocity, w a = angle of attack Se = elevator deflection £CL = closed-loop damping ratio /C,sp = damping ratio of short-period oscillation £, 7] = pole/zero cartesian coordinates in the complex plane, z=£ + iri 6 — pitch angle Ot = contribution of the /th pole or zero to argument of the rootlocus r = pilot pure time delay constant CL = closed-loop, undamped natural frequency coSp = undamped natural frequency of short-period oscillation" @default.
- W2321485725 created "2016-06-24" @default.
- W2321485725 creator A5031279371 @default.
- W2321485725 date "1970-05-04" @default.
- W2321485725 modified "2023-09-27" @default.
- W2321485725 title "An analytical investigation of short-period flying qualities" @default.
- W2321485725 doi "https://doi.org/10.2514/6.1970-569" @default.
- W2321485725 hasPublicationYear "1970" @default.
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