By Bernard Etkin

The equations of movement obtain a really complete remedy, together with the results of the curvature and rotation of the Earth and distortional movement. entire chapters are given to human pilots and dealing with characteristics and to flight in turbulence, with numerical examples for a jet shipping. Small-perturbation equations for longitudinal and lateral movement look in handy matrix types, either in time-domain and Laplace transforms, dimensional and nondimensional.

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**Sample text**

G. 6,5)] and the joint probability is a function of the parameter T, viz. 6,33) The inverse relation, from the theorem for the mean value is As shown in Fig. 9, the principal axes of the figure formed by the contours of constant f for given R ( T ) are inclined a t 45'. The contours themselves are ellipses. - JOINT DISTRIBUTION OF A FUNCTION AND ITS SLOPE We shall require the joint distribution function f (v, d ; 0 ) for a function v ( t )that has a normal distribution. 6,35) T - W 2T -T" ~ - t m41' which is zero for a finite stationary variable.

The exact specification of a system is usually arbitrary, as will be seen in the following example; the "boundary" of the system under consideration in any given circumstance is chosen by the analyst or experimenter to suit his purpose. I n addition to the state variables, there is usually associated with a system a second set of variables called inputs. These are actions upon the system the physical origins of which are outside the system. Some of these are independent of the state of the system, being determined by processes entirely external to it; these are the nonautonomous inputs.

2 TRANSFER FUNCTIONS System analysis frequently reduces to the calculation of system outputs for given inputs. A convenient and powerful tool in such analysis is the transfer function, a function G(s) of the Laplace transform variable s that relates a particular input x(t) and output y(t) as follows, Sy8tem theory 51 where (-) denotes the Laplace transform (see Sec. 3). 2,l) exists. However, it will in general be a function of the initial values of y and its derivatives, and moreover, for nonlinear and time-varying systems, of the particular input x(t) as well.