1/05/2012

Control of Spacecraft and Aircraft Review

Control of Spacecraft and Aircraft
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I am at a loss on what to say about this book. In some ways the book is not what it should be as in the analysis of spacecraft attitude control. The emphasis here is the simplification of the nonlinear Euler equations to simple linear equations to which bang-bang and other control types are then applied. Nothing wrong with that. But if he had left the equations nolinear and applied sliding mode control the results would have been virtually identical and more profound and usable. At the same time there is much information on spacecraft attitude control in the book which is nearly impossible to find elsewhere. The same is true of helicopter and airplane control. The complete emphasis on LQR control is quaint as it is the best possible control. What about more realistic control systems for real aircraft? There is a little in the book on this but very little. The sections on control of flexible systems correspond to the way many missle modelers approach the problem because of its simplicity and usefulness and several useful and interesting examples are worked out. Overall this is a useful reference for certain subject areas but it takes a sophisticated reader to separate the wheat from the chaff. It must be admitted, however, that learning the entire book would not be a bad thing for anyone. Just limiting.

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Here a leading researcher provides a comprehensive treatment of the design of automatic control logic for spacecraft and aircraft. In this book Arthur Bryson describes the linear-quadratic-regulator (LQR) method of feedback control synthesis, which coordinates multiple controls, producing graceful maneuvers comparable to those of an expert pilot.The first half of the work is about attitude control of rigid and flexible spacecraft using momentum wheels, spin, fixed thrusters, and gimbaled engines. Guidance for nearly circular orbits is discussed. The second half is about aircraft attitude and flight path control. This section discusses autopilot designs for cruise, climb-descent, coordinated turns, and automatic landing. One chapter deals with controlling helicopters near hover, and another offers an introduction to the stabilization of aeroelastic instabilities. Throughout the book there is a strong emphasis on the mathematical modeling necessary for designing a good feedback control system. The appendixes summarize analysis of linear dynamic systems, synthesis of analog and digital feedback control, simulation, and modeling of flexible vehicles.

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