By Dana Bell
Colour AND B/W photographs
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Extra resources for A-10 Warthog in detail & scale - D&S Vol. 19
The input is a sinusoidally varying (steady state) gust velocity, and the various outputs are the corresponding sinusoidally varying shears, bending moments, torsions, accelerations, concentrated inertia forces, and/or whatever else may be of interest. Thus, the simple expression H(co) may represent, in fact, the results of a developmental and computational task of great magnitude and complexity. A glimpse of what may be involved is provided in Chapter 7. 6 Input-Output Relation For a linear system, with subscripts / and o denoting input and output, respectively, the input-output relation is as indicated by Fig.
D(LQ/27c) would, of course, also be a function of a single variable, in this case LQ,/2n. These conclusions follow from Eqs. 17), from which it is seen that, except for the initial coefficient in which only L appears, L and Q each occur only in combination with the other. The presence or absence of L in the coefficient is indicated by the list of expressions following Eqs. 17). 3 Significance of L The constant L in Eqs. 17) is called the scale of turbulence. The value of L determines the frequency at which the knee of the psd curve occurs, at approximately Lft = L* The geometry of both the von Karman and the Dryden psd shapes in the vicinity of the knee is indicated in some detail in Fig.
In Figs. 10, the psd is plotted as a function of a frequency argument Q,/2n. It might be remarked that when the frequency argument is chosen instead to be LQ, then the psd $(LQ) is a function of a single variable only, L£l For all of the other frequency arguments listed earlier, O is a 10* —% \ aw = 1 fps \ 103 \ \ \\ 102 \ \^Von Karman c 0) — Q o Dryden'"''^ C/) Slope = -2" Q) Q. 85 at h = 32000 ft) \ - I 10-5 NX A\ \\^ Slope 1 1 1 1 1 1 1 i 10-4 i i 1 i i i i io-3 , , , , , A, 10 -^r cycles/ft Fig.
A-10 Warthog in detail & scale - D&S Vol. 19 by Dana Bell