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Author :
Publisher : DIANE Publishing
ISBN 13 : 1428996788
Total Pages : 29 pages
Book Rating : 4.4/5 (289 download)
Download or read book Modeling of longitudinal unsteady aerodynamics of a wingtail combination written by and published by DIANE Publishing. This book was released on with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720629061
Total Pages : 32 pages
Book Rating : 4.6/5 (29 download)
Download or read book Modeling of Longitudinal Unsteady Aerodynamics of a Wing-Tail Combination written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamic equations for the longitudinal motion of an aircraft with a horizontal tail were developed. In this development emphasis was given on obtaining model structure suitable for model identification from experimental data. The resulting aerodynamic models included unsteady effects in the form of linear indicial functions. These functions represented responses in the lift on the wing and tail alone, and interference between those two lifting surfaces. The effect of the wing on the tail was formulated for two different expressions concerning the downwash angle at the tail. The first expression used the Cowley-Glauert approximation known-as "lag-in-downwash," the second took into account growth of the wing circulation and delay in the development of the lift on the tail. Both approaches were demonstrated in two examples using the geometry of a fighter aircraft and a large transport. It was shown that the differences in the two downwash formulations would increase for an aircraft with long tail arm performing low-speed, rapid maneuvers.Klein, VladislavLangley Research CenterUNSTEADY AERODYNAMICS; AERODYNAMIC CHARACTERISTICS; AERODYNAMIC STABILITY; LONGITUDINAL STABILITY; LIFT; PITCHING MOMENTS; WIND TUNNEL TESTS; BODY-WING AND TAIL CONFIGURATIONS; WINGS; TAIL ASSEMBLIES; DOWNWASH; FIGHTER AIRCRAFT
Author : Vladislav Klein
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (317 download)
Download or read book Modeling of Longitudinal Unsteady Aerodynamics of a Wing-Tail Combination written by Vladislav Klein and published by . This book was released on 1999 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jack Morito (II)
Publisher :
ISBN 13 :
Total Pages : 438 pages
Book Rating : 4.3/5 (91 download)
Download or read book Prediction of Unsteady Aerodynamic Loadings on Non-planar Wings and Wing-tail Configurations in Supersonic Flow written by Jack Morito (II) and published by . This book was released on 1972 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: A three-dimensional extension of the Mach Box technique was developed for the unsteady aerodynamic analysis of non-planar wings and wing-tail configurations in supersonic flow. Various refinement procedures were included to improve the accuracy of the results. A general purpose computer program was written for the CDC 6600. The program is capable of treating wing-tail combinations with or without vertical separation, longitudinal separation and dihedral on either surface. If a wing alone is treated, perturbation velocity components in the flow field may be found. Correlations with experimental flutter results were performed for several models tested in the low supersonic Mach number range. The methods are intended to be used by airplane designers to calculate with improved accuracy, the unsteady aerodynamic loads that act on a lifting surface being propelled at supersonic speeds. The new feature of these calculations is that the aerodynamic interference between the wing and tail was taken into account. These calculations are an essential ingredient of flutter analyses and will improve the confidence level of such calculations in preventing wing-tail flutter.
Author : William R. Wells
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 (91 download)
Download or read book An Approximate Analysis of Wing Unsteady Aerodynamics written by William R. Wells and published by . This book was released on 1979 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief review of the unsteady aerodynamics in lifting surface theory is reported. For utility in design application, simplified but accurate analytical expressions were developed for generalized unsteady aerodynamics of wings of finite aspect ratio and sweep. This includes a means of calculating the unsteady lift load on the wing and tail surface of arbitrary shape and angle of attack variation. In addition, a formulation to include the indicial aerodynamics in the longitudinal equations of motion of the aircraft was performed. Sample numerical solutions to the longitudinal equations for a step input in elevator deflection are presented for the Navion aircraft. From these calculations, a noted difference in angle of attack and pitch rate response can be seen for the cases of unsteady and quasi-steady aerodynamics. The apparent increase in damping effects in the aircraft response due to the unsteady aerodynamics indicate that various design constraints might be relaxed somewhat if the unsteady aerodynamics is modeled properly. (Author).
Author : Albert G. Few
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.3/5 (91 download)
Download or read book Some Effects of Tail Height and Wing Plan Form on the Static Longitudinal Stability Characteristics of a Small-scale Model at High Subsonic Speeds written by Albert G. Few and published by . This book was released on 1954 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The drag due to lift increases with increasing sweep through the Mach number range. Some increase in bag due to lift is evident decrease in taper ratio for wings having 300of sweep through most of the speed range.
Author :
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (317 download)
Download or read book NASA Langley Scientific and Technical Information Output: 1999 written by and published by . This book was released on 2000 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (317 download)
Download or read book Modeling of Aircraft Unsteady Aerodynamic Characteristics. Part 1: Postulated Models written by and published by . This book was released on 1994 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jacob H. Lichtenstein
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.3/5 (91 download)
Download or read book Effect of Horizontal-tail Size and Tail Length on Low-speed Static Longitudinal Stability and Damping in Pitch of a Model Having 45° Sweptback Wing and Tail Surfaces written by Jacob H. Lichtenstein and published by . This book was released on 1951 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind-tunnel results of the effects of horizontal-tail size and length on the low-speed static longitudinal stability and the steady-state rotary damping in pitch for a complete model with wing and tail surfaces having the quarter-chord lines swept back 45 degrees and aspect ratios of 4 are presented.
Author :
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (742 download)
Download or read book Model of Unsteady Aerodynamic Coefficients of a Delta Wing Aircraft at High Angles of Attack written by and published by . This book was released on 2003 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Charles L. Seacord
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.3/5 (126 download)
Download or read book Effect of Wing Modifications on the Longitudinal Stability of a Tailless All-wing Airplane Model written by Charles L. Seacord and published by . This book was released on 1945 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: An investigation of the power-off longitudinal stability characteristics of a tailless all-wing airplane model with various wing modifications has been made in the Langley free-flight tunnel. Force and tuft tests were made on the model in the original condition, with the wing tips rotated for washout, with rectangular and swept-forward tips, and with various slat arrangements. Flight tests were made with the original wing and with the original wing equipped with the most promising modifications. The results indicated that changes in tip plan form or rotation of the wing tips did not appreciably reduce the instability at high lift coefficients. Addition of wing slats, however, improved the longitudinal stability at the stall when the slat extended far enough inboard to cover the area that tended to stall first.
Author : Juan Carlos Gomez
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (932 download)
Download or read book Low-Order Modeling of the Unsteady Aerodynamics in Flapping Wings written by Juan Carlos Gomez and published by . This book was released on 2015 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation of unsteady aerodynamics is becoming a more attractive topic of research in enhancing flight capabilities. Natural flyers such as birds and insects can undergo flight maneuvers that are very difficult or not possible with current aerodynamic understanding. Modeling the unsteady phenomena produced by flapping wings is important to the understanding of these maneuvers, with possible applications to aircraft flight. We investigate reduced-order modeling of the unsteady aerodynamics generated by flapping wings using the two separate approaches of rotational lift and dynamic stall. A low order quasi steady model based on rotational lift and a revised version incorporating dynamic stall are presented. Both concepts are analyzed using simulated results, with experimental data measured with matching kinematics as a basis of comparison. This combined model is then used to conduct parametric studies of the time averaged aerodynamic forces over varying kinematic variables.
Author :
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.F/5 ( download)
Download or read book NASA Scientific and Technical Publications written by and published by . This book was released on 1991 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Walter J. Mykytow
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.3/5 (91 download)
Download or read book Subsonic Flutter Characteristics of a Variable Sweep Wing and Horizontal Tail Combination written by Walter J. Mykytow and published by . This book was released on 1970 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The project concerns a subsonic investigation of a new type of flutter phenomenon, not previously critical from a design standpoint, involving elastic modes of the wing, fuselage, and stabilizer combination and also involving aerodynamic interference between the wing and horizontal tail. The effort, consisting of design of a flutter model, vibration and subsonic wind tunnel tests, and flutter analyses, was conducted to determine important controlling flutter parameters, to evaluate the accuracy of analyses for predicting the phenomenon, to establish flutter trends and to define flutter prevention design criteria which could be used in the early design stage to avoid the problem. Some of the important features that were determined are increasing wing sweep can lead to lower flutter speeds; wing bending to fuselage torsion frequency ratios were defined which provide the mechanical coupling essential to produce the phenomenon and minimum flutter speeds as a function of wing sweep angle; vertical separation or dihedral angle can be very influential and beneficial and is more important than longitudinal separation, the effects of which were found to be small to moderate; the effects of compressibility have been shown to be detrimental and decrease the flutter speed, and conclusive proof that the interference aerodynamics between the wind and tail, and particularly, the downwash shed from the wing, is an important and detrimental feature to the phenomenon. (Author).
Author :
Publisher :
ISBN 13 :
Total Pages : 750 pages
Book Rating : 4.X/5 (4 download)
Download or read book A Selected Listing of NASA Scientific and Technical Reports for ... written by and published by . This book was released on 1949 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 568 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bernard Etkin
Publisher : Courier Corporation
ISBN 13 : 0486141659
Total Pages : 594 pages
Book Rating : 4.4/5 (861 download)
Download or read book Dynamics of Atmospheric Flight written by Bernard Etkin and published by Courier Corporation. This book was released on 2012-08-29 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: This treatment for upper-level undergraduates, graduate students, and professionals makes special reference to stability and control of airplanes, with extensive numerical examples covering a variety of vehicles. 260 illustrations. 1972 edition.
