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Extra resources for America’s Fighters of the 1980s: F-16 and F-18 (Warbirds Illustrated 17)
Analog computation however is not so universally taught, and many students who come to the study of flight dynamics have had no prior experience with it. These we refer to refs. 12. As a further aid, one example of analog computation is presented rather fully in Sec. 2. 1 CONCEPTS AND TERMINOLOGY The branch of modern engineering analysis known as system theory is highly relevant to the study of the flight of vehicles in the atmosphere and in space. " In our present context we identify the vehicle itself as a system, of which the above examples are subsidiary systems, or associated systems.
When used as a feedback controller, E is called the actuating signal,? G(s) the forward-path transfer function and H ( s ) the feedback transfer function. 5 General feedback system. t The designation error is reserved for the difference x - y, the aim of such a control system being t o force y to be equal to x. 54 Dynamics of atmospheric fight TRANSFER FUNCTIONS OF GENERAL LINEAR/INVARIANT SYSTEM The transfer functions of a physical system that exists and is available for testing can be found from experiment, by making suitable measurements of its inputs and outputs.
An output of one system may be an input to another, or to itself if there is a simple feedback. The state variables are unique functions of the nonautonomous inputs and of the initial conditions of the system. A system with only autonomous inputs is an autonomous system. g. masses, and inductances. When these are constant, or nearly so, it is convenient to consider them as a separate set. On the other hand, if some of them vary substantially in a manner that depends on the state variables, they may usefully be transferred to the latter set.