By Mark Tischler, Robert Remple
Even though many books were written at the concept of procedure id, few can be found that offer a whole engineering therapy of method identity and the way to effectively use it on flight cars. This e-book presents the original viewpoint of over twenty years of flight-test purposes to either plane and rotorcraft and is a invaluable source for college students, operating engineers, and others attracted to atmospheric flight mechanics, modeling and simulation, and attempt and review. It offers confirmed tools, sensible guidance, and real-world flight-test effects for a variety of state of the art flight autos, from small uncrewed aerial cars (UAVs) to massive manned aircraft/rotorcraft.
Beginning with the fundamental recommendations of method id, every one bankruptcy strains an easy simulation instance and actual flight examples in the course of the step by step procedure from instrumentation and knowledge checking to version extraction and version verification. The frequency-response procedure, that's specific to this e-book, is principally compatible for procedure id of airplane and rotorcraft dynamics types from flight-test facts. an entire bankruptcy is dedicated to higher-order modeling of helicopters. Many functions are incorporated to illustrate how the goods as a result of method id are used. particular purposes comprise flight mechanics and handling-qualities analyses, balance margin selection, structural mode choice, and simulation version constancy assessment.
The e-book assumes wisdom of the fundamental options 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 approach or research software is illustrated with pics received from the method id software program (CIFERÆ) supplied with the booklet. Case reviews according to genuine flight-test tasks are incorporated in addition! as difficulties for college kids to unravel utilizing the supplied CIFERÆ software.
A strategies guide, written through Christina M. Ivler and Mark B. Tischler is offered from the writer.
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Extra info for Aircraft and rotorcraft system identification : engineering methods with flight-test examples
1), which respond directly to control inputs. 3) System identification determines the values of the matrices A, B, C, D and the vector τ that define the state-space model. The level of complexity of the state-space model required to characterize the aircraft response depends on the vehicle configuration and intended application of the model result. , yawed wing) Decoupled longitudinal Three DOF: Two translations (longitudinal, vertical) One rotation (pitch) Decoupled lateral directional Three DOF: One translation (lateral) Two rotations (roll, yaw) Vehicle is treated as a single rigid-body (fuselage/wing/tail) Longitudinal and lateral-directional degrees-of-freedom have little or no coupling Aircraft has planar symmetry Symmetric trim flight condition Most conventional fixed-wing aircraft XV-15 cruise flight* Pathfinder UAV* Shadow™ 200 fixed-wing UAV* STOVL* configuration.
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.
Army Aeroflightdynamics Directorate (AFDD) and NASA at Ames Research Center over the past more than 20 years, drawing on practical experience from many and varied individual flight projects cited in the reference list. The analysis methods are embodied in the software package Comprehensive Identification from Frequency Responses (CIFER®), also developed at Ames Research Center (and distributed commercially). System-identification projects have ranged from small (9-in. diam) ducted-fan unmanned air vehicles (UAVs) to large (100-ft wing span) solar-powered UAVs, including a wide range of manned fixed-wing aircraft and rotary-wing aircraft (rotorcraft) configurations.