On The Free Vibration Behavior Of Cylindrical Shell Structures PDF Download
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| Author | : Burak Ustundag |
| Publisher | : |
| Total Pages | : 106 |
| Release | : 2011 |
| Genre | : |
| ISBN | : |
Download On the Free Vibration Behavior of Cylindrical Shell Structures Book in PDF, ePub and Kindle
Shell structures, especially cylindrical shells, are widely used in aerospace and naval architectural industries. Submarine hulls and aircraft bodies can be idealized as cylindrical shell structures. The study of vibrations of cylindrical shells is an important aspect in the successful applications of the cylindrical shells. The free vibration characteristics of a submarine hull have an important influence on the noise signature of the submarine. That makes the free vibration problem of the submarine hull a particular interest for the submarine community. The natural frequencies of cylindrical shells are clustered in a very narrow band and they are thus more prone to becoming involved in resonant vibrations. The determination and control of these frequencies is significant to manage the acoustic signature of the submarine. This thesis focuses on the free vibration characteristics of stiffened and unstiffened cylindrical shells. The analysis is carried out mainly in two parts. First, the unstiffened cylindrical shell is modeled and the free vibration problem is analyzed as the shell thickness decreases. Then the cylindrical shell is stiffened with ring stiffeners and the free vibration problem of the stiffened cylindrical shell is studied. The vibration modes of the unstiffened cylindrical shell are studied for four shells with different thicknesses. Initial tensile and compressive membrane stresses are applied separately to the shells to study the effect of the initial stresses on the free vibration modes. The vibration modes of the stiffened cylindrical shell are studied in two steps. First, the influence of the positions of two ring stiffeners on the fundamental frequencies is studied; second, the free vibration modes of the stiffened cylindrical shell are studied. Two cylindrical shells with different thicknesses are used and they are stiffened with different numbers of ring stiffeners, which are uniformly distributed along the longitudinal axis of the shell. The results are compared with available analytical results and finite element solutions of similar problems from the literature.
| Author | : Arthur W. Leissa |
| Publisher | : |
| Total Pages | : 438 |
| Release | : 1973 |
| Genre | : Government publications |
| ISBN | : |
Download Vibration of Shells Book in PDF, ePub and Kindle
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.
| Author | : Werner Soedel |
| Publisher | : CRC Press |
| Total Pages | : 594 |
| Release | : 2004-08-11 |
| Genre | : Mathematics |
| ISBN | : 0203026306 |
Download Vibrations of Shells and Plates Book in PDF, ePub and Kindle
With increasingly sophisticated structures involved in modern engineering, knowledge of the complex vibration behavior of plates, shells, curved membranes, rings, and other complex structures is essential for today‘s engineering students, since the behavior is fundamentally different than that of simple structures such as rods and beams. Now in its
| Author | : V. I. Petrov |
| Publisher | : |
| Total Pages | : 22 |
| Release | : 1968 |
| Genre | : |
| ISBN | : |
Download FREE VIBRATIONS OF CYLINDRICAL SHELLS. Book in PDF, ePub and Kindle
General analysis of free vibration of closed circular cylindrical shells is based on fundamental relationships taken from the theories of shells. The shells are radially supported at their faces. The effect of terms usually neglected in equations of shell motion on frequency is discussed. The simplifying assumptions concerning shell behavior which are associated with these terms are examined for a wide range of variations in shell geometry. Expressions are extended for free vibration of orthogonally anisotropic shells, and a formula for their natural frequencies is obtained. Two-layer shells stiffened by stringers and transverse frames and sandwich shells are analyzed as particular cases.
| Author | : Saggam Narendar |
| Publisher | : LAP Lambert Academic Publishing |
| Total Pages | : 400 |
| Release | : 2014-08-06 |
| Genre | : |
| ISBN | : 9783659584619 |
Download Buckling and Vibration Analysis of Buried Shell Structures Book in PDF, ePub and Kindle
This book deals with the study of the free vibration and buckling of buried cylindrical shell structures. These shells are modelled as circular cylindrical shells embedded in elastic medium. These problems are analyzed from all the available various shell theories. Governing equations of the shells are obtained from the variational principles. Symbolic solutions of the various shell theories to obtain natural frequencies are presented via MATLAB computation. Wave propagation approach is used to solve both the buckling and vibration problems. A generalized MATLAB code is also presented for the study of the vibration and buckling of buried shells. The book will be very much useful for the post graduate students and research scholars, those who are working in the various branches of mechanical engineering.
| Author | : Anthony E. Armenàkas |
| Publisher | : Elsevier |
| Total Pages | : 225 |
| Release | : 2013-10-22 |
| Genre | : Technology & Engineering |
| ISBN | : 1483158616 |
Download Free Vibrations of Circular Cylindrical Shells Book in PDF, ePub and Kindle
Free Vibrations of Circular Cylindrical Shells deals with thin-walled structures that undergo dynamic loads application, thereby resulting in some vibrations. Part I discusses the treatment of problems associated with the propagation of plane harmonic waves in a hollow circular cylinder. In such search for solutions, the text employs the framework of the three-dimensional theory of elasticity. The text explains the use of tables of natural frequencies and graphs of representative mode shapes of harmonic elastic waves bounding in an infinitely long isotropic hollow cylinder. The tables are found to be useful as they can be used to check validity and provide estimates of the range of applicability of various shell theories. The purpose of the frequency equation and that of the numerical computations likewise are considered. The book includes a computer program written in the FORTRAN language to show how it is used in the computations, except in cases when H (the thickness of shell) and L (axial half of wavelength) result in extremely small values. Part II consists of related tables and graphs. Physicists, engineers, students, and researchers in advanced sciences will find this book of interest.
| Author | : National Aeronautics and Space Adm Nasa |
| Publisher | : Independently Published |
| Total Pages | : 34 |
| Release | : 2018-12-31 |
| Genre | : Science |
| ISBN | : 9781792825545 |
Download Laminated Thin Shell Structures Subjected to Free Vibration in a Hygrothermal Environment Book in PDF, ePub and Kindle
Parametric studies were performed to assess the effects of various parameters on the free-vibration behavior (natural frequencies) of (+/- theta)(sub 2) angle-ply, fiber composite, thin shell structures in a hygrothermal environment. Knowledge of the natural frequencies of structures is important in considering their response to various kinds of excitation, especially when structures and force systems are complex and when excitations are not periodic. The three dimensional, finite element structural analysis computer code CSTEM was used in the Cray YMP computer environment. The fiber composite shell was assumed to be cylindrical and made from T300 graphite fibers embedded in an intermediate-modulus, high-strength matrix. The following parameters were investigated: the length and the laminate thickness of the shell, the fiber orientation, the fiber volume fraction, the temperature profile through the thickness of the laminate, and laminates with different ply thicknesses. The results indicate that the fiber orientation and the length of the laminated shell had significant effects on the natural frequencies. The fiber volume fraction, the laminate thickness, and the temperature profile through the shell thickness had weak effects on the natural frequencies. Finally, the laminates with different ply thicknesses had an insignificant influence on the behavior of the vibrated laminated shell. Also, a single through-the-thickness, eight-node, three dimensional composite finite element analysis appears to be sufficient for investigating the free-vibration behavior of thin, composite, angle-ply shell structures. Gotsis, Pascal K. and Guptill, James D. Glenn Research Center NASA-TM-106600, E-8874, NAS 1.15:106600 RTOP 537-04-20...
| Author | : H. H. Bleich |
| Publisher | : |
| Total Pages | : 52 |
| Release | : 1952 |
| Genre | : Differential equations |
| ISBN | : |
Download Free and Forced Vibrations of an Infinitely Long Cylindrical Shell in an Infinite Acoustic Medium Book in PDF, ePub and Kindle
A method is presented which permits the determination of the frequencies of vibrations of infinitely long thin cylindrical shells in an acoustic medium. Expressions are obtained for the displacements of the shell and for the pressures in the medium in the case of forced vibrations due to sinusoidally distributed radial forces. The results indicate that there is a low-frequency range, where no radiation takes place, and a high-frequency range where the external force provides energy which is radiated. Resonance occurs in the low-frequency range only; in the high-frequency range it is prevented by the damping due to radiation. Free and forced vibrations of steel shells submerged in water are discussed; with limitations, the theory may be applied approximately to stiffened shells. The method requires only a minor modification to account for the effect of static pressure in the surrounding medium. The treatment of transient problems is also considered. If high-frequency terms occur in the force, or shock effects are wanted within a short time after the application of the force, a treatment using solely modes of vibration of the submerged structure would be incomplete, as additional terms occur in the solution. As an alternative approach, the modes of free vibration of the structure may be used as generalized coordinates which fully describe the response of the structure but leave the medium to be treated, by means of the differential equations for the potential or in any other way desired.
| Author | : Anthony N. Palazotto |
| Publisher | : AIAA |
| Total Pages | : 278 |
| Release | : 1992 |
| Genre | : Composite construction |
| ISBN | : 9781600860911 |
Download Nonlinear Analysis of Shell Structures Book in PDF, ePub and Kindle
| Author | : Bo Liu |
| Publisher | : World Scientific |
| Total Pages | : 651 |
| Release | : 2021-08-03 |
| Genre | : Technology & Engineering |
| ISBN | : 9811236771 |
Download A Differential Quadrature Hierarchical Finite Element Method Book in PDF, ePub and Kindle
The differential quadrature hierarchical finite element method (DQHFEM) was proposed by Bo Liu. This method incorporated the advantages and the latest research achievements of the hierarchical finite element method (HFEM), the differential quadrature method (DQM) and the isogeometric analysis (IGA). The DQHFEM also overcame many limitations or difficulties of the three methods.This unique compendium systemically introduces the construction of various DQHFEM elements of commonly used geometric shapes like triangle, tetrahedrons, pyramids, etc. Abundant examples are also included such as statics and dynamics, isotropic materials and composites, linear and nonlinear problems, plates as well as shells and solid structures.This useful reference text focuses largely on numerical algorithms, but also introduces some latest advances on high order mesh generation, which often has been regarded as the major bottle neck for the wide application of high order FEM.
