Download or read book Numerical Investigation of Aerodynamics of Canard controlled Missile Using Planar and Grid Tail Fins written by James DeSpirito and published by . This book was released on 2004 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Viscous computational fluid dynamic simulations were used to predict the aerodynamic coefficients and flow field around a canard-controlled missile in subsonic and transonic flow. Computations were performed at Mach 0.6 and 0.9, six angles of attack between 0 deg and 10 deg, and with planar and grid tail fins. The computations were validated with wind tunnel data. Flow visualizations showed that the canard downwash produced a low-pressure region on the starboard side of the missile that produced a large induced side force. The canard trailing vortices interacted with the tail fins until alpha> 8 deg, producing a pressure differential on the leeward tail fin, leading to the adverse induced roll effects. Visualizations of the flow through the grid fin structure showed choking of the flow at Mach 0.9 and Mach 1.5. The validated simulations results showed that grid fins did not improve the canard roll-control effectiveness at subsonic and transonic speeds as well as they did at the low supersonic speed.

Download or read book Canard Cycles written by Peter De Maesschalck and published by Springer Nature. This book was released on 2021-08-07 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers the first systematic account of canard cycles, an intriguing phenomenon in the study of ordinary differential equations. The canard cycles are treated in the general context of slow-fast families of two-dimensional vector fields. The central question of controlling the limit cycles is addressed in detail and strong results are presented with complete proofs. In particular, the book provides a detailed study of the structure of the transitions near the critical set of non-isolated singularities. This leads to precise results on the limit cycles and their bifurcations, including the so-called canard phenomenon and canard explosion. The book also provides a solid basis for the use of asymptotic techniques. It gives a clear understanding of notions like inner and outer solutions, describing their relation and precise structure. The first part of the book provides a thorough introduction to slow-fast systems, suitable for graduate students. The second and third parts will be of interest to both pure mathematicians working on theoretical questions such as Hilbert's 16th problem, as well as to a wide range of applied mathematicians looking for a detailed understanding of two-scale models found in electrical circuits, population dynamics, ecological models, cellular (FitzHugh–Nagumo) models, epidemiological models, chemical reactions, mechanical oscillators with friction, climate models, and many other models with tipping points.

Download or read book Static Longitudinal Aerodynamic Characteristics of Close coupled Wing canard Configurations at Mach Numbers from 1 60 to 2 86 written by Samuel M. Dollyhigh and published by . This book was released on 1971 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was made in the Mach number range from 1.60 to 2.86 to determine the static longitudinal aerodynamic characteristics of close-coupled wing-canard configurations. Three canards, ranging in exposed planform area from 17.5 to 30.0 percent of the wing reference area, were employed in this investigation. The canards were either located in the plane of the wing or in a position 18.5 percent of the wing mean geometric chord above the wing plane. Most data obtained were for a model with a 60 deg leading-edge-sweep wing; however, a small amount of data were obtained for a 44 deg leading-edge-sweep wing. The model utilized two balances to isolate interference effects between wing and canard. In general, it was determined that at angle of attack for all configurations investigated with the canard in the plane of the wing an unfavorable interference exists which causes the additional lift on the canard generated by a canard deflection to be lost on the wing due to an increased downwash at the wing from the canard. Further, this interference decreased somewhat with increasing Mach number. Raising the canard above the plane of the wing also greatly decreased the interference of the canard deflection on the wing lift. However, at Mach 2.86 the presence of the canard in the high position had a greater unfavorable interference effect at high angles of attack than the canard in the wing plane. This interference resulted in the in-plane canard having better trimmed performance at Mach 2.86 for the same center-of-gravity location.

Download or read book Effects of Canard Planform and Wing leading edge Modification on Low speed Longitudinal Aerodynamic Characteristics of a Canard Airplane Configuration written by Bernard Spencer and published by . This book was released on 1961 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation has been conducted at low subsonic speeds to study the effects of canard planform and wing-leading-edge modification on the longitudinal aerodynamic characteristics of a general research canard airplane configuration. The basic wing of the model had a trapezoidal planform, an aspect ratio of 3.0, a taper ratio of 0.143, and an unswept 80-percent-chord line. Modifications to the wing included addition of full-span and partial-span leading-edge chord-extensions. Two canard planforms were employed in the study one was a 60° sweptback delta planform and the other was a trapezoidal planform similar to that of the basic wing. Modifications to these canards included addition of a full-span leading-edge chord-extension to the trapezoidal planform and a fence to the delta planform. For the basic-wing-trapezoidal-canard configuration, rather abrupt increases in stability occurred at about 12° angle of attack. A slight pitch-up tendency occurred for the delta-canard configuration at approximately 8° angle of attack. A comparison of the longitudinal control effectiveness for the basic-wing-trapezoidal-canard combination and for the basic-wing-delta-canard combination indicates higher values of control effectiveness at low angles of attack for the trapezoidal canard. The control effectiveness for the delta-canard configuration, however, is seen to hold up for higher canard deflections and to higher angles of attack. Use of a full-span chord-extension deflected approximately 30° on the trapezoidal canard greatly improved the control characteristics of this configuration and enabled a sizeable increase in trim lift to be realized.

Download or read book Low speed Longitudinal Characteristics of an Airplane Configuration Including Effects of Canard and Wing Trailing edge Flap Controls in Combination written by Bernard Spencer and published by . This book was released on 1962 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interference Effects of Canard Controls on the Longitudinal Aerodynamic Characteristics of a Winged Body at Mach 10 written by Cuyler W. Brooks (Jr.) 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 Vortex Interaction on a Canard wing Configuration written by Wladimiro Calarese and published by . This book was released on 1986 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experiment studies the interaction of vortices shed by the canard and wing's leading edges, and their effect on the aircraft aerodynamic characteristics. A close-coupled canard-wing configuration was selected and tested in different wind tunnels and at different conditions. Tunnel and model size effects, Mach number, angle of attack, and spanwise blowing effects on the vortex interaction were analyzed. Intrusive (hot wires) and non-intrusive (laser doppler velocimeters) data acquisition techniques were used and compared to enhance the reliability of the results. Flow visualization by tufts, oil, and laser light sheets were employed. Mean velocities, vortex turbulence intensities, and Reynolds stresses obtained for different conditions were compared and found to be generally consistent. Mach number, wind tunnel, and model size effects were in general small. Turbulence intensities and stresses increased with angles of attack. Spanwise blowing produced a small favorable effect. The use of a coplanar canard produced a small favorable interaction between the leading edge vortices, while the off-set canard produced a considerable increase in the lift/drag ratio. Keywords: Vortex flow; Subsonic flow; Close-coupled canards; Vortex shedding.

Download or read book Aerodynamic Loads on Deployed Canard Surfaces and Rocket Nose Section of the Apollo Launch Escape Vehicle written by William C. Moseley (Jr.) and published by . This book was released on 1969 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Static Stability and Control of Canard Configurations at Mach Numbers from 0 70 to 2 22 Trangular Wing and Canard with Twin Vertical Tails written by Victor L. Peterson 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 Asymmetric Penshape Nozzles in Jet canard Configurations for Attitude Control written by Robert W. Cubbison and published by . This book was released on 1963 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canard Cycles and Center Manifolds written by Freddy Dumortier and published by American Mathematical Soc.. This book was released on 1996 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the ``canard phenomenon'' occurring in Van der Pol's equation $\epsilon \ddot x+(x^2+x)\dot x+x-a=0$ is studied. For sufficiently small $\epsilon >0$ and for decreasing $a$, the limit cycle created in a Hopf bifurcation at $a = 0$ stays of ``small size'' for a while before it very rapidly changes to ``big size'', representing the typical relaxation oscillation. The authors give a geometric explanation and proof of this phenomenon using foliations by center manifolds and blow-up of unfoldings as essential techniques. The method is general enough to be useful in the study of other singular perturbation problems.

Download or read book Effect of Canards in Reducing Launch Vehicle Flight Loads written by and published by . This book was released on 1967 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Campbell s Abstract of Creek Indian Census Cards and Index written by John Bert Campbell and published by . This book was released on 1915 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Campbell s Abstract of Creek Freedman Census Cards and Index written by John Bert Campbell and published by . This book was released on 1915 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Gaelic Etymology of the Languages of Western Europe written by Charles Mackay and published by . This book was released on 1877 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalogue of the Birds in the British Museum Chenomorph Palamede Ph nicopteri Anseres Crypturi and Ratit by T Salvadori written by British Museum (Natural History). Department of Zoology and published by . This book was released on 1895 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalogue of the Birds in the British Museum Chenomorph Palamede Ph icopteri Anseres Crypturi and Ratit by T Salvadori 1895 written by British Museum (Natural History). Department of Zoology and published by . This book was released on 1895 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: This enormous undertaking, which, according to one of the prefaces, professes to be a complete list of every bird known at the time of publication, kept growing even as it was being written. The Museum added eagerly to their already vast collections during the decades of publication, acquiring by gift the great collections of A.O. Hume on Asian birds, and those of Sclater and Salvin and Godwin on Neotropical birds, so that the size of the collection nearly tripled between 1874 and 1888. Sharpe originally intended to do all the work himself, but others were called in when this became clearly impossible. The plates are all of birds not previously illustrated. In the decades following its publication this catalogue was universally acclaimed as the most important work on systematic ornithology that has ever been published. (Zimmer, p. 96). And even after one hundred years it remains an essential reference for the serious ornithologist, as it underpins a great deal of modern bird classification. With 387 plates, most hand-coloured lithographs, some chromolithographs, by William Hart, J.G. Keulemans, Joseph and Peter Smit.