Aircraft and rotorcraft system identification : engineering by Mark Tischler, Robert Remple
By Mark Tischler, Robert Remple
Even if many books were written at the concept of approach identity, few can be found that supply an entire engineering therapy of method identity and the way to effectively use it on flight automobiles. This publication presents the original point of view of over twenty years of flight-test functions to either airplane and rotorcraft and is a worthy source for college students, operating engineers, and others attracted to atmospheric flight mechanics, modeling and simulation, and try and evaluate. It offers confirmed tools, useful instructions, and real-world flight-test effects for a variety of cutting-edge flight cars, from small uncrewed aerial autos (UAVs) to massive manned aircraft/rotorcraft.
Beginning with the elemental strategies of method id, each one bankruptcy lines an easy simulation instance and actual flight examples throughout the step by step method from instrumentation and information checking to version extraction and version verification. The frequency-response process, that's specified to this booklet, is principally compatible for process id of airplane and rotorcraft dynamics versions from flight-test info. a whole bankruptcy is dedicated to higher-order modeling of helicopters. Many purposes are integrated to illustrate how the goods as a result of procedure id are used. particular purposes contain flight mechanics and handling-qualities analyses, balance margin selection, structural mode decision, and simulation version constancy assessment.
The publication assumes wisdom of the elemental suggestions of aeronautics, Laplace transforms, and flight dynamics and classical regulate. Emphasis is put on engineering tools and interpretation of flight-test effects and every key process or research software is illustrated with photographs got from the method id software program (CIFERÆ) supplied with the e-book. Case reports in line with actual flight-test initiatives are integrated besides! as difficulties for college kids to resolve utilizing the supplied CIFERÆ software.
A options guide, written through Christina M. Ivler and Mark B. Tischler is out there from the writer.
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Extra resources for Aircraft and rotorcraft system identification : engineering methods with flight-test examples
Longitudinal and lateraldirectional degrees of freedom are not coupled. Aircraft has planar symmetry. fm Page 8 Friday, June 16, 2006 3:15 PM 8 AIRCRAFT AND ROTORCRAFT SYSTEM IDENTIFICATION Fig. 6 Simulation vs system identification. that this can be done before the aircraft has been built. In some cases the agreement between the predicted and measured dynamic behavior is unsatisfactory, at least initially, before “tuning,” because of the accumulated uncertainties and modeling simplifications. The approach is less suitable for small unmanned air vehicles (UAVs), which often have unique designs that are not similar to any existing database.
2 Helicopter as an input-output system. fm Page 3 Friday, June 16, 2006 3:15 PM INTRODUCTION AND BRIEF HISTORY Fig. 3 3 Typical frequency-sweep input. effective format, used exclusively herein for presenting identification results in the frequency domain, is the Bode plot of the frequency-response function H , which displays log-magnitude ( 20 log 10 H , dB) and phase ( ∠H , deg) vs log-frequency (ω, rad/s herein) on a semilog scale. A typical example is the Bode plot for aircraft sideslip response to rudder β ⁄ δ r obtained from flight-test data shown in the solid 2 curve of Fig.
These responses fully characterize the coupled characteristics of the system without a priori assumptions. fm Page 17 Friday, June 16, 2006 3:15 PM INTRODUCTION AND BRIEF HISTORY 17 conditioning (Chapter 9), and composite window techniques (Chapter 10), developed and exercised with over 20 years worth of flight project applications, provide significant improvements in frequency-response quality relative to standard fast Fourier transforms (FFTs). Sophisticated nonlinear search algorithms are used to extract parametric models of varying complexity from this MIMO frequencyresponse database that are used in simulation, handling-qualities, and flightcontrol studies.