New PDF release: Aircraft and rotorcraft system identification : engineering

By Mark Tischler, Robert Remple

Even if many books were written at the conception of process id, few can be found that offer an entire engineering remedy of approach id and the way to effectively use it on flight automobiles. This e-book presents the original point of view of over two decades of flight-test purposes to either plane and rotorcraft and is a priceless source for college kids, operating engineers, and others drawn to atmospheric flight mechanics, modeling and simulation, and try out and review. It offers confirmed equipment, useful guidance, and real-world flight-test effects for a variety of state of the art flight autos, from small uncrewed aerial autos (UAVs) to giant manned aircraft/rotorcraft.

Beginning with the elemental recommendations of method id, every one bankruptcy lines an easy simulation instance and genuine flight examples during the step by step strategy from instrumentation and information checking to version extraction and version verification. The frequency-response process, that's detailed to this booklet, is principally well matched for approach id of plane and rotorcraft dynamics types from flight-test facts. an entire bankruptcy is dedicated to higher-order modeling of helicopters. Many purposes are integrated to illustrate how the goods as a result of process identity are used. particular purposes comprise flight mechanics and handling-qualities analyses, balance margin decision, structural mode decision, and simulation version constancy assessment.

The e-book assumes wisdom of the fundamental techniques of aeronautics, Laplace transforms, and flight dynamics and classical keep watch over. Emphasis is put on engineering equipment and interpretation of flight-test effects and every key technique or research program is illustrated with pix acquired from the method id software program (CIFERÆ) supplied with the e-book. Case stories in keeping with actual flight-test tasks are incorporated besides! as difficulties for college students to resolve utilizing the supplied CIFERÆ software.

A ideas guide, written through Christina M. Ivler and Mark B. Tischler is on the market from the writer.

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Responses Response pairs are fit only in the frequency range over which the data are accurate. 4 Characteristic (continued) Frequency-response methods Time-response methods Number of points Small number of points are included in iterative identification criterion, which improves computational efficiency. , factor of 30 increase). Algorithms or equations used Identification algorithms are very efficient because frequency responses are determined algebraically from updated parameters. Equations of motion must be numerically integrated in time for each iterative update in the parameters.

For example, the nonparametric results can be used to great benefit in selecting the appropriate order of the transfer-function and/or statespace models. The frequency-response identification method presented in this book is an integrated two-stage process of nonparametric followed by parametric modeling. There are many applications based solely on the frequency-response characterizations, including handling-qualities analysis in terms of the bandwidth and time-delay parameters, pilot-in-the-loop analysis, stability margin determination, classical control system design, and validation and tuning of physics-based simulation models.

6 Role and Limitations of Flight-Mechanics Models Determined with the System-Identification Method Physics-based simulation models provide the first estimates of vehicle response prior to first flight. Developing a simulation model entails a comprehensive effort to determine the many geometric, aerodynamic, and mechanical parameters required for the input deck. , Ref. 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.

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Aircraft and rotorcraft system identification : engineering methods with flight-test examples by Mark Tischler, Robert Remple

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