Download or read book Stability Derivative Determination from Flight Data written by Chester H. Wolowicz and published by . This book was released on 1958 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive discussion of the various factors affecting the determination of stability and control derivatives from flight data is presented. Factors relating to test techniques, determination of mass characteristics, instrumentation, and methods of analysis are discussed. For most longitudinal-stability-derivative analyses simple equations utilizing period and damping were found to be as satisfactory as more comprehensive methods. The graphical time-vector method was the basis of lateral-derivative analysis, although simple approximate methods can be useful if applied with caution. Control effectiveness was generally obtained by relating the peak acceleration to the rapid control input, and consideration must be given to aerodynamic contributions if reasonable accuracy is to be realized. Because of the many factors involved in the determination of stability derivatives, it is believed that the primary stability and control derivatives are probably accurate to within 10 to 25%, depending upon the specific derivative. Static-stability derivatives at low angle of attack show the greatest accuracy. (Author).
Download or read book Flight Testing Techniques for the Evaluation of Light Aircraft Stability Derivitives written by Frederick O. Smetana and published by . This book was released on 1972 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Matrix Method of Determining the Longitudinal stability Coefficients and Frequency Response of an Aircraft from Transient Flight Data written by James J. Donegan and published by . This book was released on 1951 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is presented for obtaining the over-all longitudinal-stability coefficients and frequency response of an aircraft from an analysis of arbitrary maneuvers in which simple instrumentation is used. Although the method presented deals entirely with the aircraft, it is equally applicable to other problems which can be expressed by second-order differential equations.
Download or read book Real Time Stability and Control Derivative Extraction from F 15 Flight Data written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-04 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: A real-time, frequency-domain, equation-error parameter identification (PID) technique was used to estimate stability and control derivatives from flight data. This technique is being studied to support adaptive control system concepts currently being developed by NASA (National Aeronautics and Space Administration), academia, and industry. This report describes the basic real-time algorithm used for this study and implementation issues for onboard usage as part of an indirect-adaptive control system. A confidence measures system for automated evaluation of PID results is discussed. Results calculated using flight data from a modified F-15 aircraft are presented. Test maneuvers included pilot input doublets and automated inputs at several flight conditions. Estimated derivatives are compared to aerodynamic model predictions. Data indicate that the real-time PID used for this study performs well enough to be used for onboard parameter estimation. For suitable test inputs, the parameter estimates converged rapidly to sufficient levels of accuracy. The devised confidence measures used were moderately successful.Smith, Mark S. and Moes, Timothy R. and Morelli, Eugene A.Armstrong Flight Research Center; Langley Research CenterF-15 AIRCRAFT; PARAMETER IDENTIFICATION; REAL TIME OPERATION; STABILITY DERIVATIVES; CONTROL STABILITY; CONTROL SYSTEMS DESIGN; FREQUENCY DOMAIN ANALYSIS; FLIGHT CONDITIONS; INDUSTRIES; NASA PROGRAMS; FOURIER TRANSFORMATION; REGRESSION ANALYSIS; ALGORITHMS; ERROR ANALYSIS; ONBOARD DATA PROCESSING
Download or read book Determination of Stability Derivatives from Flight Data Using a Newton Raphson Minimization Technique written by Kenneth W. Iliff and published by . This book was released on 1971 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Real Time Stability and Control Derivative Extraction From F 15 Flight Data written by Mark S. Smith and published by . This book was released on 2003 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preliminary Flight Evaluation of the Stability and Control Derivatives and Dynamic Characteristics of the Unaugmented XB 70 1 Airplane Including Comparisons with Predictions written by and published by . This book was released on 1968 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of the Stability and Control Derivatives of the NASA F A 18 Harv Using Flight Data written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the research conducted for the NASA-Ames Cooperative Agreement No. NCC 2-759 with West Virginia University. A complete set of the stability and control derivatives for varying angles of attack from 10 deg to 60 deg were estimated from flight data of the NASA F/A-18 HARV. The data were analyzed with the use of the pEst software which implements the output-error method of parameter estimation. Discussions of the aircraft equations of motion, parameter estimation process, design of flight test maneuvers, and formulation of the mathematical model are presented. The added effects of the thrust vectoring and single surface excitation systems are also addressed. The results of the longitudinal and lateral directional derivative estimates at varying angles of attack are presented and compared to results from previous analyses. The results indicate a significant improvement due to the independent control surface deflections induced by the single surface excitation system, and at the same time, a need for additional flight data especially at higher angles of attack. Napolitano, Marcello R. and Spagnuolo, Joelle M. Unspecified Center AIRCRAFT CONTROL; AIRCRAFT STABILITY; ANGLE OF ATTACK; F-18 AIRCRAFT; FLIGHT TESTS; LATERAL STABILITY; LONGITUDINAL STABILITY; MAXIMUM LIKELIHOOD ESTIMATES; PARAMETER IDENTIFICATION; AIRCRAFT MANEUVERS; CONTROL SURFACES; EQUATIONS OF MOTION; MATHEMATICAL MODELS; THRUST VECTOR CONTROL...
Download or read book Determination of the Stability and Control Derivatives from Flight Data for the MAE Cessna U 206 written by Alfonso C. Paris and published by . This book was released on 1994 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of Methods for Predicting the Stability Characteristics of an Elastic Airplane Appendix B Methods for Determining Stability Derivatives written by and published by . This book was released on 1968 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flight Determined Subsonic Longitudinal Stability and Control Derivatives of the F 18 High Angle of Attack Research Vehicle HARV with Thrust Vectoring written by Kenneth W. Iliff and published by . This book was released on 1997 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Stability Derivatives from Ballistic Range Tests of Rolling Aircraft Models written by Alfred G. Boissevain and published by . This book was released on 1961 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Stability and Control Derivatives from the NASA F A 18 Harv from Flight Data Using the Maximum Likelihood Method written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a compilation of PID (Proportional Integral Derivative) results for both longitudinal and lateral directional analysis that was completed during Fall 1994. It had earlier established that the maneuvers available for PID containing independent control surface inputs from OBES were not well suited for extracting the cross-coupling static (i.e., C(sub N beta)) or dynamic (i.e., C(sub Npf)) derivatives. This was due to the fact that these maneuvers were designed with the goal of minimizing any lateral directional motion during longitudinal maneuvers and vice-versa. This allows for greater simplification in the aerodynamic model as far as coupling between longitudinal and lateral directions is concerned. As a result, efforts were made to reanalyze this data and extract static and dynamic derivatives for the F/A-18 HARV (High Angle of Attack Research Vehicle) without the inclusion of the cross-coupling terms such that more accurate estimates of classical model terms could be acquired. Four longitudinal flights containing static PID maneuvers were examined. The classical state equations already available in pEst for alphadot, qdot and thetadot were used. Three lateral directional flights of PID static maneuvers were also examined. The classical state equations already available in pEst for betadot, p dot, rdot and phi dot were used. Enclosed with this document are the full set of longitudinal and lateral directional parameter estimate plots showing coefficient estimates along with Cramer-Rao bounds. In addition, a representative time history match for each type of meneuver tested at each angle of attack is also enclosed. Napolitano, Marcello R. Unspecified Center...
Download or read book The Determination of Aircraft Stability Coefficients from Flight Test Data written by Lloyd Eugene Wilkie and published by . This book was released on 1958 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Several Methods for Estimating Low speed Stability Derivatives for Two Airplane Configurations written by Herman S. Fletcher and published by . This book was released on 1971 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods presented in five different publications have been used to estimate the low-speed stability derivatives of two unpowered airplane configurations. One configuration had unswept lifting surfaces, the other configuration was the D-558-II swept-wing research airplane. The results of the computations were compared with each other, with existing wind-tunnel data, and with flight-test data for the D-558-II configuration to assess the relative merits of the methods for estimating derivatives. The results of the study indicated that, in general, for low subsonic speeds, no one text appeared consistently better for estimating all derivatives.
Download or read book Matrix Methods for Determining the Longitudinal stability Derivatives of an Airplane from Transient Flight Data written by James J. Donegan and published by . This book was released on 1954 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three matrix methods are presented for determining the longitudinal-stability derivatives from transient flight data. One method, which requires four measurements in time-history form and utilizes the incremental tail load to separate the pitching-moment derivatives, permits the computation of all the longitudinal-stability derivatives. A second method requires three measurements and one supplemental assumption. This method gives the most information for the least amount of work. The third method requires to measurements and two supplemental assumptions. An inspection of the results obtained for the various methods shows the scatter which is typical of this type of analysis of flight data.
Download or read book The Determination of Aircraft Stability Coefficients from Flight test Data written by Lloyd Eugene Wilkie and published by . This book was released on 1958 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
