Download Aircraft and Rotorcraft System Identification by Mark B. Tischler PDF

By Mark B. Tischler

Proposing confirmed tools, functional guidance, and real-world flight-test effects for quite a lot of cutting-edge flight cars, "Aircraft and Rotorcraft approach id, moment version" addresses the total technique of airplane and rotorcraft method id from instrumentation and flight checking out to version decision, validation, and alertness of the consequences. during this hugely expected moment version, authors Tischler and Remple have extra devoted in-depth chapters featuring prolonged version buildings and identity effects for big versatile shipping airplane, and the particular method to improve a continual complete flight envelope simulation version from person approach identity versions and trim try out facts. themes mentioned comprise: Frequency-response tools which are specifically compatible for process identity of flight car versions from flight-test facts; particular directions for flight trying out, info research, and the correct number of version constitution complexity; and emphasis at the significance of actual perception in version improvement and purposes. designated positive aspects: pupil model of CIFER[registered] with up-to-date graphical consumer interface utilizing MATLAB[registered]; a variety of flight-test effects for either manned and unmanned cars illustrating the wide-ranging roles of method id, together with the research of flight mechanics, suggestions keep watch over, dealing with features, subsystem dynamics, structural research, higher-order types for airplane and rotorcraft, and simulation; and, broad challenge units on the finish of every bankruptcy, with many routines in accordance with flight-test information supplied for the XV-15 in hover and cruise giving the reader hands-on real-world event with approach id equipment and interpretation of the implications.

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Extra resources for Aircraft and Rotorcraft System Identification

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2 Helicopter as an input-output system. 2 aerodynamic angles, a, P INTRODUCTION AND BRIEF HISTORY t I I 0 20 40 I 60 Time (sec) 3 I I 80 100 Fig. 3 Typical frequency-sweepinput. 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,,(HI, dB) and phase (LH, deg) vs log-frequency (o, radls herein) on a semilog scale. A typical example is the Bode plot for aircraft sideslip response to rudder p/6, obtained from flight-test data shown injhe solid curve of Fig.

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. A schematic diagram (road map) of the frequency-response method and typical flight-test results for aircraft and rotorcraft are presented in Chapter 2.

A frequency-response data curve that characterizes a single-input/single-output (SISO) subsystem such as an actuator can easily be obtained from the measurement data of the excitation (electrical input) and response (actuator displacement). 0 Fig. 4 Typical doublet input. 0 4 AIRCRAFT AND ROTORCRAFT SYSTEM IDENTIFICATION Frequency (radlsec) -Flight data --- Transfer function model Fig. 5 Typical Bode plot and transfer-functionmodel. However, flight tests of aircraft and helicopters usually involve multiple inputs and multiple outputs (also denoted as multi-input/multi-output, or MIMO), and special conditioning techniques are required to obtain a MIMO frequency-response matrix that characterizes the overall dynamic system response.

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