Download Aircraft and Rotorcraft System Identification by Mark B. Tischler PDF

By Mark B. Tischler

Offering confirmed equipment, functional guidance, and real-world flight-test effects for a variety of cutting-edge flight autos, "Aircraft and Rotorcraft process id, moment version" addresses the complete means of plane and rotorcraft approach id from instrumentation and flight trying out to version decision, validation, and alertness of the consequences. during this hugely expected moment version, authors Tischler and Remple have extra devoted in-depth chapters featuring prolonged version constructions and id effects for giant versatile shipping plane, and the specific technique to boost a continual complete flight envelope simulation version from person procedure id versions and trim try out info. subject matters mentioned comprise: Frequency-response tools which are particularly like minded for process id of flight automobile types from flight-test information; particular guidance for flight checking out, information research, and the correct collection of version constitution complexity; and emphasis at the significance of actual perception in version improvement and functions. targeted positive factors: scholar model of CIFER[registered] with up-to-date graphical consumer interface utilizing MATLAB[registered]; a variety of flight-test effects for either manned and unmanned cars illustrating the wide-ranging roles of process identity, together with the research of flight mechanics, suggestions keep an eye on, dealing with characteristics, subsystem dynamics, structural research, higher-order versions for plane and rotorcraft, and simulation; and, large challenge units on the finish of every bankruptcy, with many routines in response to flight-test information supplied for the XV-15 in hover and cruise giving the reader hands-on real-world event with approach id tools and interpretation of the implications.

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Sample text

10, 16, and 17), key physical parameters (such as inertias) or physical effects (such as cross coupling or rotor/fuselage aerodynamic interaction) are poorly known. Thus, for example, even after the completion of an expensive blade-element-type modeling effort for a helicopter simulation, there ensues an intensive "validation effort" to bring the simulation closer to flight. , Refs. 17-20) in the early flight-test stage. "). 12 An often-cited deficiency of the system-identification approach is that the identified parameters reflect the "lumped" contributions of numerous physical mechanisms.

The following topics will be covered in this chapter: 1) basic terminology and concepts of system identification of aircraft and rotorcraft, 2) special challenges of rotorcraft system identification, 3) role of nonparametric vs parametric models, 4) how system identification supports the aircraft development process, 5) comparison of frequency-response vs time-response methods, 6) brief history of the development of frequency-domain methods for aircraft and rotorcraft system identification, and 7) organization of this book.

One role of system identification is to quantify where the actual and predicted motions do not match and to provide information on proper tuning for improved prediction accuracy. In that respect the two procedures, one forward and one inverse, are highly complimentary. Key applications of system-identification results include piloted simulation models, comparison of wind-tunnel vs flight measurements, validation and improvement of physics-based simulation models, flight-control system development and validation, and handling-qualities specification compliance testing.

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