By Mark Tischler, Robert Remple
Even though many books were written at the thought of method id, few can be found that supply an entire engineering remedy of process id and the way to effectively use it on flight cars. This publication presents the original point of view of over twenty years of flight-test purposes to either airplane and rotorcraft and is a worthwhile source for college kids, operating engineers, and others attracted to atmospheric flight mechanics, modeling and simulation, and try and assessment. It provides confirmed equipment, sensible guidance, and real-world flight-test effects for a variety of cutting-edge flight cars, from small uncrewed aerial automobiles (UAVs) to giant manned aircraft/rotorcraft.
Beginning with the elemental ideas of procedure identity, each one bankruptcy lines an easy simulation instance and genuine flight examples in the course of the step by step approach from instrumentation and information checking to version extraction and version verification. The frequency-response technique, that's distinctive to this booklet, is principally well matched for approach identity of airplane and rotorcraft dynamics versions from flight-test information. an entire bankruptcy is dedicated to higher-order modeling of helicopters. Many functions are integrated to illustrate how the goods because of method id are used. particular functions comprise flight mechanics and handling-qualities analyses, balance margin choice, structural mode selection, and simulation version constancy assessment.
The booklet assumes wisdom of the elemental ideas 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 strategy or research program is illustrated with photos got from the procedure id software program (CIFERÆ) supplied with the e-book. Case experiences in accordance with genuine flight-test initiatives are incorporated to boot! as difficulties for college kids to resolve utilizing the supplied CIFERÆ software.
A ideas guide, written through Christina M. Ivler and Mark B. Tischler is offered from the writer.
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Additional info for Aircraft and rotorcraft system identification : engineering methods with flight-test examples
The parametric modeling stage generally involves a more intensive effort, with added focus on the physical understanding of the system being modeled to ensure that the appropriate model structure is adopted. Parametric modeling in the frequency domain can take two forms: transfer-function and state-space models. The simplest form uses transfer functions, which are the pole-zero representations of individual SISO frequency-response pairs. , roll-rate response to aileron). These transfer-function models provide the key dynamic modes and control sensitivities.
Initial data Consist of frequency responses (derived from time-history data) Consist of time-history data How models are identified By matching predicted frequency responses against measured frequency responses By matching predicted time histories against measured time histories Starting the method Frequency-domain methods start by calculating frequency responses, getting some preliminary information about the model structure, and then (if necessary) identifying a more detailed and accurate parametric model structure.
The main concepts of system identification and a historical overview are presented in Chapter 1. A schematic diagram (road map) of the frequency-response method and typical flight-test results for aircraft and rotorcraft are presented in Chapter 2. The succeeding chapters trace the steps of the roadmap from flighttest planning and instrumentation to data checking, appropriate choice of model structure, and then the central topics of model identification and verification. Each chapter presents the theory, engineering methods, practical guidelines for application, examples, and flight-test results for the particular step in the road map.