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Supersonic Flutter Of A Cylindrical Shell I General Theory
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Book Synopsis Supersonic Flutter of a Cylindrical Shell. I. General Theory by : John W. Miles
Download or read book Supersonic Flutter of a Cylindrical Shell. I. General Theory written by John W. Miles and published by . This book was released on 1955 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The equations governing the generation of traveling waves along an infinite, thin, cylindrical shell by an external air stream are formulated. The subsidiary problems of transverse wave propagation along the free shell and the calculation of the aerodynamic forces associated with a given wave then are solved. It is found that the minimum wave speed for the free shell occurs at a wavelength of the order of the geometric mean of shell thickness and radius. This neighborhood, in which flexural and extensional stresses are approximately equal in magnitude, is anticipated as the most critical for panel flutter (unstable wave motion). The restriction to wavelengths that are short compared with both length and radius of shell permits a relatively simple, quasi-planar approximation to the aerodynamic forces. The stability boundary for panel flutter in the absence of external damping is calculated and numerical results presented for shell thickness/radius ratio vs. Mach number. The negative damping ratio for unstable motion than is calculated and plotted vs a dimensionless dynamic pressure. It is shown that the structural damping ratio required to prevent panel flutter is equal to this negative damping ratio. (Author).
Book Synopsis On Comparing Theory and Experiment for the Supersonic Flutter of Circular Cylindrical Shells by : Mervyn D. Olson
Download or read book On Comparing Theory and Experiment for the Supersonic Flutter of Circular Cylindrical Shells written by Mervyn D. Olson and published by . This book was released on 1966 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flutter boundaries obtained from recent experiments on the supersonic flutter of circular cylindrical shells are compared with various theoretical predictions. Following Voss, a model analysis is used in conjunction with different aerodynamic approximations - namely, piston theory and the potential solution of Leonard and Hedgepeth. It was found that the pressurized cylindrical shells fluttered at a lower level of free stream energy than predicted by the theory. Of the two results, that using piston theory appears to correspond closest to the experiment. The influence of the viscous boundary layer on cylindrical shell flutter is reexamined. The boundary layer is modeled by a parallel shear flow, and the oscillating shell surface is approximated by an oscillating plane wall whose deflection is sinusoidal in both in-plane directions. Viscous effects are neglected with respect to flow perturbation quantities, nonlinear terms are neglected, and the final equations are integrated numerically through the boundary layer. It was found that, for the thicknesses of boundary layer present in the experiments, the resulting pressures on the oscillating wall are reasonably close to the corresponding potential theory ones. Hence, in that sense, the influence of the boundary layer appears to be negligible for shell flutter with many circumferential waves. (Author).
Book Synopsis Supersonic Flutter of a Cylindrical Shell by : John W. Miles
Download or read book Supersonic Flutter of a Cylindrical Shell written by John W. Miles and published by . This book was released on 1955 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlinear Flutter of a Circular Cylindrical Shell in Supersonic Flow by : David A. Evensen
Download or read book Nonlinear Flutter of a Circular Cylindrical Shell in Supersonic Flow written by David A. Evensen and published by National Research Council of Canada. This book was released on 1967 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supersonic Flutter of a Cylindrical Shell of Finite Length in an Axisymmetrical Mode by : Hans Krumhaar
Download or read book Supersonic Flutter of a Cylindrical Shell of Finite Length in an Axisymmetrical Mode written by Hans Krumhaar and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report the flutter of an axisymmetrical mode of a simply supported cylindrical shell is studied. The linearized Timoshenko shell equations and linear piston theory lead to a non-self-adjoint eigenvalue problem, which has been solved withouth further approximations. Using these "exact" solutions two checks can be made. A comparison of the exact result with those obtained by Galerkin's method proves whether or not this method is reliable if applied to the present eigenvalue problem. On the other hand, a comparison of the exact results with experimental data will prove whether or not the basic physical assumptions are satisfactory.
Book Synopsis NACA Conference on Aircraft Loads, Structures, and Flutter by :
Download or read book NACA Conference on Aircraft Loads, Structures, and Flutter written by and published by . This book was released on 1957 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aeroelastic Vibrations and Stability of Plates and Shells by : Sergey D. Algazin
Download or read book Aeroelastic Vibrations and Stability of Plates and Shells written by Sergey D. Algazin and published by Walter de Gruyter GmbH & Co KG. This book was released on 2014-12-11 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: Back-action of aerodynamics onto structures such as wings cause vibrations and may resonantly couple to them, thus causing instabilities (flutter) and endangering the whole structure. By careful choices of geometry, materials and damping mechanisms, hazardous effects on wind engines, planes, turbines and cars can be avoided. Besides an introduction into the problem of flutter, new formulations of flutter problems are given as well as a treatise of supersonic flutter and of a whole range of mechanical effects. Numerical and analytical methods to study them are developed and applied to the analysis of new classes of flutter problems for plates and shallow shells of arbitrary plane form. Specific problems discussed in the book in the context of numerical simulations are supplemented by Fortran code examples (available on the website).
Book Synopsis Supersonic Flutter of a Circular Cylindrical Shell of Finite Length in an Axisymmetrical Mode by : Hans Krumhaar
Download or read book Supersonic Flutter of a Circular Cylindrical Shell of Finite Length in an Axisymmetrical Mode written by Hans Krumhaar and published by . This book was released on 1965 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supersonic Flutter of Circular Cylindrical Shells by : Mervyn D. Olson
Download or read book Supersonic Flutter of Circular Cylindrical Shells written by Mervyn D. Olson and published by . This book was released on 1966 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research on Panel Flutter of Cylindrical Shells by :
Download or read book Research on Panel Flutter of Cylindrical Shells written by and published by . This book was released on 1964 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical study was made on the panel flutter characteristics of a ring and longeron stiffened circular cylindrical shell at high supersonic Mach numbers. This study is an extension of an earlier program and uses the cyclic reduction procedure developed there to simplify the flutter analysis. This actual reduction procedure has been included in this report for completeness. An improved modal analysis was employed in this study which leads to an increased understanding of the flutter behavior of such complex structures at the high supersonic Mach numbers. A method for extending the above analysis to the lower supersonic Mach numbers is also discussed. An investigation of the aerodynamic pressures on cylindrical shells in unsteady supersonic potential flow has also been carried out. A general solution for these aerodynamic pressures was obtained which is valid at both the high and low supersonic Mach numbers. The general solution was expressed in terms of Randall functions by reducing the unsteady flow problem to an equivalent steady flow problem through an appropriate transformation. Certain limiting cases of this general solution are presented along with their well-known flat plate counterparts. Finally, an analytical approximation is developed for the Randall functions which would be useful in a cylindrical shell panel flutter analysis. (Author).
Book Synopsis Vibration of Shells by : Arthur W. Leissa
Download or read book Vibration of Shells written by Arthur W. Leissa and published by . This book was released on 1973 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vibrational characteristics and mechanical properties of shell structures are discussed. The subjects presented are: (1) fundamental equations of thin shell theory, (2) characteristics of thin circular cylindrical shells, (3) complicating effects in circular cylindrical shells, (4) noncircular cylindrical shell properties, (5) characteristics of spherical shells, and (6) solution of three-dimensional equations of motion for cylinders.
Book Synopsis Supersonic Flutter of Circular Cylindrical Shells Subjected to Internal Pressure and Axial Compression by : Mervyn D. Olson
Download or read book Supersonic Flutter of Circular Cylindrical Shells Subjected to Internal Pressure and Axial Compression written by Mervyn D. Olson and published by . This book was released on 1965 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of recent experiments on the flutter of circular cylindrical shells in the Mach number range 2.5-3.5 are presented. Three shells with radius-to-thickness ratios of 2000 were subjected to radial external pressure loadings and to combinations of axial compressive loading and internal pressurization while in the presence of an external axiallydirected supersonic flow. Small amounts of internal pressurization were very stabilizing with respect to flutter, but moderate amounts reduced stability to the unpressurized level. However, high internal pressures completely stabilized the shells. The axial compressive loading was slightly destabilizing for moderate amounts of internal pressurization. There was no apparent danger of destruction of models even for the most violent flutter conditions which occurred just prior to buckling under radial external pressure loading and just after buckling under axial compressive loading. Buckled portions of a shell did not flutter. It appears that the large local curvatures encountered in the buckling of a cylindrical shell have a marked stabilizing effect on the shell locally. However, it also appears that the localized buckling usually encountered in practice significantly reduces the stability of any unbuckled regions of the shell. (Author).
Book Synopsis Supersonic Panel Flutter of a Cylindrical Shell of Finite Length by : Sainsbury Lee Strack
Download or read book Supersonic Panel Flutter of a Cylindrical Shell of Finite Length written by Sainsbury Lee Strack and published by . This book was released on 1959 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supersonic Flutter of Cylindrical Shells by : David John Johns
Download or read book Supersonic Flutter of Cylindrical Shells written by David John Johns and published by . This book was released on 1960 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flutter, Vibration, and Buckling of Truncated Orthotropic Conical Shells with Generalized Elastic Edge Restraint by : Sidney C. Dixon
Download or read book Flutter, Vibration, and Buckling of Truncated Orthotropic Conical Shells with Generalized Elastic Edge Restraint written by Sidney C. Dixon and published by . This book was released on 1970 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1973 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
