By Mark Tischler, Robert Remple
Even if many books were written at the concept of approach identity, few can be found that offer an entire engineering remedy of process identity and the way to effectively use it on flight automobiles. This booklet presents the original point of view of over twenty years of flight-test purposes to either plane and rotorcraft and is a important source for college students, operating engineers, and others attracted to atmospheric flight mechanics, modeling and simulation, and try and evaluate. It provides confirmed equipment, sensible directions, and real-world flight-test effects for a variety of cutting-edge flight autos, from small uncrewed aerial automobiles (UAVs) to massive manned aircraft/rotorcraft.
Beginning with the elemental ideas of method id, every one bankruptcy lines an easy simulation instance and genuine flight examples throughout the step by step method from instrumentation and information checking to version extraction and version verification. The frequency-response strategy, that's detailed to this publication, is mainly well matched for process identity of plane and rotorcraft dynamics versions from flight-test information. a whole bankruptcy is dedicated to higher-order modeling of helicopters. Many purposes are integrated to illustrate how the goods due to approach identity are used. particular purposes comprise flight mechanics and handling-qualities analyses, balance margin decision, structural mode decision, and simulation version constancy assessment.
The publication assumes wisdom of the elemental techniques of aeronautics, Laplace transforms, and flight dynamics and classical keep an eye on. Emphasis is put on engineering equipment and interpretation of flight-test effects and every key technique or research program is illustrated with pics got from the procedure identity software program (CIFERÆ) supplied with the booklet. Case experiences in line with actual flight-test initiatives are integrated in addition! as difficulties for college kids to resolve utilizing the supplied CIFERÆ software.
A ideas guide, written via Christina M. Ivler and Mark B. Tischler is obtainable from the writer.
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Additional info for Aircraft and rotorcraft system identification : engineering methods with flight-test examples
This book is intended for use in an advanced undergraduate or graduate level course on system identification. The exercises give the student hands-on experience with a wide range of aircraft and rotorcraft applications using flight-test and simulation data. The material herein assumes some familiarity with basic concepts of aeronautics, Laplace transforms, flight dynamics, and classical control, as presented at a typical undergraduate level. The main concepts of system identification and a historical overview are presented in Chapter 1.
Fuselage/wing/tail) and must be modeled as a coupled multibody dynamics system. There is strong coupling between the dynamics of the rotor blades and the dynamics of the air flow passing through the rotor (inflow) with those of the fuselage, control system, and engine, so that as many as 13 degrees of freedom (or even more) are often necessary to model the dynamic response accurately. The planar symmetry of a fixedwing aircraft also leads to considerable simplification of system-identification model structures, decoupling into a three-DOF model for the longitudinal dynamics and a separate three-DOF model for lateral/directional dynamic characteristics.
An accurate curve fit) of the frequency-response data. 1) where the system identification determines the values of the numerator coefficients ( b 0, b 1,…, b m ) and denominator coefficients ( a 1,…, a n ). An example of a transfer-function representation for the frequency-response β ⁄ δ r is shown in the dashed curve of Fig. 5. The transfer function is one type of parametric model1,2 because it is composed of a limited set of characteristic quantities, or parameters—in this case the numerator and denominator coefficients of the transfer function.