New PDF release: Gust Loads on Aircraft: Concepts & Applications

By Frederic M. Hoblit

This publication presents an authoritative and useful presentation of the decision of gust rather a lot on airplanes, specially non-stop turbulence gust a lot. The textual content emphasizes the fundamental ideas concerned about gust load choice and enriches the cloth with dialogue of vital relationships, definitions of terminology and nomenclature, old standpoint, and reasons of proper calculations. insurance starts off with discrete-gust idealization of the gust constitution and strikes to continuous-turbulence gust so much. additionally thought of are lots blend and layout standards, gust-response equations of movement, spanwise version of vertical gust pace, nonlinear platforms, and research of gust-response flight-test info.

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Extra info for Gust Loads on Aircraft: Concepts & Applications

Example text

Internally generated noise in electronic circuits appears to be one of these. The ramifications of these requirements with respect to atmospheric turbulence are discussed in Chapter 12. 4. 1 Frequency Content: Superposition of Sinusoids The magnitude of a stationary Gaussian random process is seen to be defined statistically by its rms value and its probability distribution (Gaussian). To complete the statistical description of the random process requires, in addition, the definition of its frequency content.

10) was introduced by Tukey in 1949 (see Appendix L). This has come to be called the Blackman-Tukey method and was standard for many years. * This method takes the Eq. 8) route, but utilizes an ingenious scheme that vastly reduces the amount of computation. This involves dividing the time history into a number of blocks, each containing L equally spaced points, where L must be an integer power of 2; for example, 32, 64, 128, etc. Determination of psd's from time histories is treated in much more detail in Chapter 11.

9) that when i = 0, R = y2 = a2. From this relation, it is clear that autocovariance is a more appropriate term than autocorrelation although the latter is in more common use. The quantity y2, which R(i) is equal to at T = 0, is often referred to in statistics as the variance. In contrast, correlation is invariably a normalized quantity, with a value of unity indicating perfect correlation, as occurs as i = 0. Accordingly, the term autocorrelation function should more properly refer to R(i)lo2.

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