Gotowe bibliografie tematyczne / Vibration of shells (engineering)

Gotowa bibliografia na temat „Vibration of shells (engineering)”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 10 lutego 2022

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Artykuły w czasopismach na temat "Vibration of shells (engineering)"

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Zhao, Ming Hui. "Vibration Analysis of a Shell Structure by Finite Element Method". Advanced Materials Research 591-593 (listopad 2012): 1929–33. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.1929.

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Plate-shell structures, especially cylindrical shells and spherical shells, are widely used in engineering fields, such as aircraft and tanks, missiles, submarines, ships, hydraulic pumps, infusion pipelines and gas pipelines, and so on. These structures are usually in a fluid medium, which are related to the structure fluid-solid coupling and acoustic radiation field. As many experiments show that enclosed air in a thin walled structure, just like the violin, affects some modes of vibration significantly, air coupling between vibrating sides of the structure cannot be neglected. In order to explore the sound pressure distribution of vibrational frequencies, this paper, considering the material anisotropy, analyzes a typical complex shell structure of the violin by finite element method, including acoustic-structure coupling analysis and post-processing, especially sound pressure vibration frequency extraction. Finally, we get the conclusion that the distribution of sound pressure vibration frequency is similar to the normal distribution.
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Khatri, K. N. "Vibration Control of Conical Shells Using Viscoelastic Materials". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 206, nr 3 (maj 1992): 167–78. http://dx.doi.org/10.1243/pime_proc_1992_206_113_02.

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The vibration and damping analysis of multi-layered conical shells incorporating layers of viscoelastic materials in addition to elastic ones, the former causing dissipation of vibratory energy, is the subject matter of this paper. The analysis given herein uses Hamilton's variational principle for deriving equations of motion of a general multi-layered conical shell. In view of the correspondence principle of linear viscoelasticity which is valid for harmonic vibrations, the solution is obtained by replacing the moduli of viscoelastic layers by complex moduli. An approximate solution for axisymmetric vibrations of multi-layered conical shells with two end conditions—simply supported edges and clamped edges—is obtained by utilizing the Galerkin procedure. The damping effectiveness in terms of the system loss factor for all families of modes of vibrations for three-, five- and seven-layered shells is evaluated and its variation with geometrical parameters is investigated.
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Qatu, Mohamad S. "Recent research advances in the dynamic behavior of shells: 1989-2000, Part 1: Laminated composite shells". Applied Mechanics Reviews 55, nr 4 (1.07.2002): 325–50. http://dx.doi.org/10.1115/1.1483079.

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Laminated composite shells are increasingly being used in various engineering applications including aerospace, mechanical, marine, and automotive engineering. With the increasing awareness of and sensitivity to structural noise and vibration, research covering the dynamic behavior of composite shells has received considerable attention. The purpose of this article is to review most of the recent research done in this field. Review of the literature on the dynamic behavior of homogeneous shells is covered in Part 2 of this article to be published in the September 2002 issue of AMR. Research on shell dynamics is found to be mainly free vibration analyses. The review is conducted with emphasis given to the theory being applied (thin, thick, 3D, nonlinear, …), the analysis method (exact, Ritz, finite elements, …), complicating effects (initial stress, imperfection, added masses and springs, elastic supports, rotating shells, and others), and the various shell geometries that were subject to vibration research (cylindrical, conical, spherical, and others). There are 374 references cited in this review article.
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Kang, Jae-Hoon. "3D Vibration Analysis of Combined Shells of Revolution". International Journal of Structural Stability and Dynamics 19, nr 02 (luty 2019): 1950005. http://dx.doi.org/10.1142/s0219455419500056.

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A three-dimensional (3D) method of analysis is presented for determining the natural frequencies and the mode shapes of combined hemispherical–cylindrical shells of revolution with and without a top opening by the Ritz method. Instead of mathematically two-dimensional (2D) conventional thin shell theories or higher-order thick shell theories, the present method is based upon the 3D dynamic equations of elasticity. Mathematically, minimal or orthonormal Legendre polynomials are used as admissible functions in place of ordinary simple algebraic polynomials which are usually applied in the Ritz method. The analysis is based upon the circular cylindrical coordinates instead of the shell coordinates which are normal and tangent to the shell mid-surface. Strain and kinetic energies of the combined shell of revolution with and without a top opening are formulated, and the Ritz method is used to solve the eigenvalue problem, thus yielding upper bound values of the frequencies by minimizing the frequencies. As the degree of the Legendre polynomials is increased, frequencies converge to the exact values. Convergence to four-digit exactitude is demonstrated for the first five frequencies. Numerical results are presented for the combined shells of revolution with or without a top opening, which are completely free and fixed at the bottom of the combined shells. The frequencies from the present 3D Ritz method are compared with those from 2D thin shell theories by previous researchers. The present analysis is applicable to very thick shells as well as very thin shells.
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XIANG, Y., C. W. LIM i S. KITIPORNCHAI. "AXISYMMETRIC VIBRATION OF CYLINDRICAL SHELLS WITH INTERMEDIATE RING SUPPORTS". International Journal of Structural Stability and Dynamics 03, nr 01 (marzec 2003): 35–53. http://dx.doi.org/10.1142/s021945540300080x.

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This paper treats the axisymmetric vibration of thin circular cylindrical shells with intermediate ring supports based on the Goldenveizer–Novozhilov thin shell theory. An analytical method is proposed, and new exact solutions are presented to study the axisymmetric vibration characteristics of the ring supported cylindrical shells. In the proposed method, the state-space technique is employed to derive a homogenous differential equation system for a shell segment, and a domain decomposition approach is developed to cater for the continuity requirements between shell segments. Exact frequency parameters are presented for circular cylindrical shells that have multiple intermediate ring supports and various combinations of end support conditions. These exact vibration frequencies may serve as important benchmarks against which researchers can validate their numerical methods for such circular cylindrical shell problems.
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Ribeiro, Pedro. "Linear modes of vibration of cylindrical shells in composite laminates reinforced by curvilinear fibres". Journal of Vibration and Control 22, nr 20 (9.08.2016): 4141–58. http://dx.doi.org/10.1177/1077546315571661.

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Modes of vibration of thin cylindrical shells made up of layers with curvilinear fibres (variable stiffness composite laminates (VSCL) shells) are investigated in the linear regime. A p-version finite element type formulation is developed for that purpose; in the absence of data on vibrations of cylindrical VSCL shells, the formulation is verified by comparisons with published data on laminated shells reinforced by straight fibres and on VSCL plates. Parametric studies are performed, in order to investigate how curvilinear fibre paths can influence the modes of vibration. It is found that curvilinear fibre paths can have a very large effect, larger than on plates, on the natural frequencies and natural mode shapes of vibration of cylindrical shells. Factors that strongly influence the modes of vibration of VSCL shells are found; these include the fibre orientation at boundaries and in relation to principal normal sections.
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Sarkheil, Saeed, Mahmud S. Foumani i Hossein M. Navazi. "Free vibration of bi-material cylindrical shells". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, nr 15 (9.08.2016): 2637–49. http://dx.doi.org/10.1177/0954406215602037.

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Based on the Sanders thin shell theory, this paper presents an exact solution for the vibration of circular cylindrical shell made of two different materials. The shell is sub-divided into two segments and the state-space technique is employed to derive the homogenous differential equations. Then continuity conditions are applied where the material of the cylindrical shell changes. Shells with various combinations of end boundary conditions are analyzed by the proposed method. Finally, solving different examples, the effect of geometric parameters as well as BCs on the vibration of the bi-material shell is studied.
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Qatu, Mohamad S. "Vibration of Homogeneous and Composite Thick Barrel Shells". Journal of Vibration and Control 10, nr 3 (marzec 2004): 319–41. http://dx.doi.org/10.1177/1077546304031845.

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This paper presents a vibration analysis for homogeneous and laminated composite deep, thick barrel shells using recently derived equations of elastic deformation. Assuming a first-order linear displacement field, the equations include accurate force and moment resultants, in which the stresses over the thickness of the shell are integrated exactly on a trapezoidal-like cross-section of a shell element. Exact solutions were obtained for thick barrel, open and closed, shells having shear diaphragm boundary conditions and cross-ply lamination sequence. The results were compared with previously obtained results where various other thick shell theories were used. The effects of various parameters including radii of curvature on shell frequencies are studied.
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Ko, Soo-Min, i Jae-Hoon Kang. "Vibration of Hemispherical-Cylindrical-Hemispherical Shells and Complete Hollow Spherical Shells with Variable Thickness". International Journal of Structural Stability and Dynamics 19, nr 03 (marzec 2019): 1950018. http://dx.doi.org/10.1142/s0219455419500184.

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The natural frequencies and mode shapes of enclosed shell typed structures with variable thickness (hemispherical-cylindrical-hemispherical shells and complete hollow spherical shells) are determined by the Ritz method using a three-dimensional (3D) analysis. However, in the conventional shell analysis, mathematically two-dimensional (2D) thin shell theories or higher order thick shell theories are often employed, which adopt limiting assumptions about the displacement variation through the shell thickness. While most researchers have adopted the 3D shell coordinates that are normal and tangential to the shell mid-surface, the present analysis is based upon the circular cylindrical coordinates. By the Ritz method, the Legendre polynomials, which are mathematically orthonormal and minimal, are used as the admissible functions, instead of the ordinary algebraic polynomials. The strain and kinetic energies of the combined shell structures are formulated, and upper bound solutions of the frequencies are obtained by minimizing the solution for frequencies. As the degree of the Legendre polynomials is increased, frequencies converge to the exact values. Convergence to four-digit exactitude is demonstrated for the first five frequencies. The frequencies from the present 3D method are compared with those from other 3D approach and 2D thin and thick shell theories existing in the literature. The present 3D analysis is applicable to both very thick shells and very thin shells.
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Patil, Subhash R., H. N. Narasimha Murthy, G. S. Srivatsa, Viketh S. Yandigeri, Ramanraj K., Basavaraja Meti, Gangadhar Angadi i D. V. N. Harish. "Study of Vibration Behaviour of Stiffened Polymer Composite Shells for Underwater Structural Applications". Defence Science Journal 70, nr 3 (24.04.2020): 342–50. http://dx.doi.org/10.14429/dsj.70.14703.

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This paper presents vibration behavior of ring stiffened polymer composite thick shells used for underwater structures. Filament wound shells stiffened with internal and external rings and with hemispherical ends were tested for vibration in air and water in free-free boundary condition using roving hammer and fixed response method. Modal testing of the shells was performed under hydrostatic loading in a custom designed buckling tester for determining natural frequency at higher sea depths. Accelerometer was mounted on the inner surface of the shell. It was excited using a plumbob, rope and pulley arrangement. Experimental results were validated by modal analysis using Hyperworks and ANSYS. Vibration behavior in water was simulated by Fluid structure interaction approach. Experimental first natural frequency in water was lesser than that in air. With increase in hydrostatic pressure, the shell showed moderate variation in natural frequency. The experimental and numerical results of natural frequency and mode shapes were in good agreement with each other. Natural frequencies were lower in long and thick shells.
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Rozprawy doktorskie na temat "Vibration of shells (engineering)"

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McDaniel, James Gregory. "A new higher-order shell theory for vibration and viscoelastically-coated circular cylindrical shells". Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/15825.

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Xu, Bo. "Vibration and stability analysis of toroidal shells". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/MQ45257.pdf.

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Li, Nong. "Vibration of laminated orthotropic composite plates and shells". Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6946.

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Almost all of the analytical solution techniques presented for composite plates and shells deal with either simply supported conditions or boundary conditions with at least a pair of opposite edges simply supported. In the present study, an alternative general approach, combining superposition and state space techniques is developed for the free vibration analysis of laminated orthotropic composite plates and shells having arbitrary boundary conditions. This study concentrates on the antisymmetric angle-ply laminated plates and cross-ply laminated plates and shells. Three commonly adopted theories, i.e., classical theory, first-order shear deformation theory and third-order shear deformation theory, have been employed and compared with one another to investigate the influence of transverse shear deformation, structural aspect ratio, length-to-thickness ratio, degree of anisotropy and the number of layers on natural frequency. Convergence tests have been carried out to guarantee the accuracy of the closed-form solutions. Wherever possible, numerical results generated by the present approach are compared with those reported in the published references. Accurate non-dimensional fundamental frequencies are presented for laminated plates and shells with two adjacent edges, three edges and four edges clamped and other edges simply supported. Such analyses have not been reported in the literature previously. Also, vibration analysis of a cantilever angle-ply antisymmetric plate with a point support is conducted to demonstrate the applicability of the present technique. It has been shown that the method works extremely well and excellent agreements are found between the present results and those generated by previous researchers. It has also been shown that more complicated boundary-value problems can be solved by this technique without any difficulty.
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Alizadeh, Y. "Free vibration of partially supported plates and shells". Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/10751.

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First-order transverse shear-deformation Mindlin theory has been used to predict the free vibration frequencies and modal shapes for isotropic, laminated and composite plates or shells. A finite element model based on the small deflection linear theory has been developed to obtain numerical solutions for this class of problems. The results for some of the degenerate cases are compared with other results available in the literature. These analyses involve a wide number of variables, namely; material properties, aspect ratios, support conditions and also radius to base ratio. The cracked base plates, shells and blades are idealized as partially supported models with varying support lengths. The effects of the detached base length on natural frequencies, modal shapes and nodal lines of these types of structures are investigated. Although the expected decrease in frequency with increase in the detached base length is observed almost for all modes it is seen that this behavior is very pronounced for higher modes in both plates and shells. Analysis also showed that the variation of the detached base length has a small effect on the natural frequencies of plates and shells with large aspect ratios ( b/a > 2, r/a > 2).
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Shaw, Christopher Edward. "The effects of imperfections on the acoustic scattering of a coated shell". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/17903.

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Du, Hung-Yih Isaac. "Vibration and buckling of geometrically imperfect laminated cylindrical shells /". The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487326511716282.

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Qatu, Mohamad-Subhi Khalil. "Free vibration and static analysis of laminated composite shallow shells /". The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487670346875409.

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Qatu, Mohamad Subhi Khalil. "Free vibration and static analysis of laminated composite shallow shells". The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392112808.

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Wang, X. H. "Free vibration and stability of complete orthotropic circular toroidal shells". Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26799.

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This study makes contributions in the areas of vibration and stability analysis of complete orthotropic circular toroidal shells. It is conducted in four main parts. A literature survey is first carried out indicating the new and continuing uses of toroidal shells in engineering structures. Secondly, theory is developed for the free vibration analysis of toroidal shells using the differential quadrature method. Numerical results are determined using the method for shells with small bend to cross-section radius ratios, and compared with finite element results. Thirdly, theory is developed using the Rayleigh-Ritz method for the free vibration analysis of toroidal shells having large bend to cross-section radius ratios. A parametric study of such shells including orthotropic and ring-stiffened isotropic ones is conducted using the finite element method. Finally, theory is developed using the Rayleigh-Ritz method for the linearized buckling analysis of toroidal shells with large bend to cross-section radius ratios. Numerical results are found for orthotropic and ring-stiffened isotropic shells using the finite element method. All theoretical work is carried out within the confines of the first-order Sanders-Budiansky shell theory. The work ends with an appropriate set of conclusions.
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Young, Andrew J. "Active control of vibration in stiffened structures". Title page, contents and abstract only, 1995. http://hdl.handle.net/2440/37722.

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Active control of vibration in structures has been investigated by an increasing number of researchers in recent years. There has been a great deal of theoretical work and some experiment examining the use of point forces for vibration control, and more recently, the use of thin piezoelectric crystals laminated to the surfaces of structures. However, control by point forces is impractical, requiring large reaction masses, and the forces generated by laminated piezoelectric crystals are not sufficient to control vibration in large and heavy structures. The control of flexural vibrations in stiffened structures using piezoceramic stack actuators placed between stiffener flanges and the structure is examined theoretically and experimentally in this thesis. Used in this way, piezoceramic actuators are capable of developing much higher forces than laminated piezoelectric crystals, and no reaction mass is required. This thesis aims to show the feasibility of active vibration control using piezoceramic actuators and angle stiffeners in a variety of fundamental structures. The work is divided into three parts. In the first, the simple case of a single actuator used to control vibration in a beam is examined. In the second, vibration in stiffened plates is controlled using multiple actuators, and in the third, the control of vibration in a ring-stiffened cylinder is investigated. In each section, the classical equations of motion are used to develop theoretical models describing the vibration of the structures with and without active vibration control. The effects of the angle stiffener(s) are included in the analysis. The models are used to establish the quantitative effects of variation in frequency, the location of control source(s) and the location of the error sensor(s) on the achievable attenuation and the control forces required for optimal control. Comparison is also made between the results for the cases with multiple control sources driven by the same signal and with multiple independently driven control sources. Both finite and semi-finite structures are examined to enable comparison between the results for travelling waves and standing waves in each of the three structure types. This thesis attempts to provide physical explanations for all the observed variations in achievable attenuation and control force(s) with varied frequency, control source location and error sensor location. The analysis of the simpler cases aids in interpreting the results for the more complicated cases. Experimental results are given to demonstrate the accuracy of the theoretical models in each section. Trials are performed on a stiffened beam with a single control source and a single error sensor, a stiffened plate with three control sources and a line of error sensors and a ring-stiffened cylinder with six control sources and a ring of error sensors. The experimental results are compared with theory for each structure for the two cases with and without active vibration control.
Thesis (Ph.D.)--Mechanical Engineering, 1995.
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Książki na temat "Vibration of shells (engineering)"

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Vibration of laminated shells and plates. Amsterdam: Elsevier, 2004.

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Vibrations of shells and plates. Wyd. 3. New York: Marcel Dekker, 2004.

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Vibrations of shells and plates. Wyd. 2. New York: Marcel Dekker, 1993.

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Le, Khanh Chau. Vibrations of Shells and Rods. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999.

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Vibrations of Shells and Rods. Berlin: Springer-Verlag, 1999.

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Filippov, I. G. Matematicheskai͡a︡ teorii͡a︡ kolebaniĭ uprugikh i vi͡a︡zkouprugikh plastin i sterzhneĭ. Kishinev: "Shtiint͡s︡a", 1988.

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Markuš, Štefan. The mechanics of vibrations of cylindrical shells. Amsterdam: Elsevier, 1988.

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Kiĭko, I. A. (Igorʹ Anatolʹevich), red. Aeroelastic vibrations and stability of plates and shells. Berlin: Walter de Gruyter GmbH & Co. KG, 2015.

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Selmane, A. Vibration analysis of anisotropic open cylindrical shells containing flowing fluid. Montréal, Québec, Canada: Dept. of Mechanical Engineering, École polytechnique de Montréal, Campus de l'Université de Montréal, 1995.

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1929-, Bert Charles Wesley, red. Nonlinear dynamic problems for composite cylindrical shells. London: Elsevier Applied Science, 1993.

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Części książek na temat "Vibration of shells (engineering)"

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Wilson, J. "Vibration of Axisymmetric Shells". W Vibrations of Engineering Structures, 195–214. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82390-9_11.

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Banakh, Liudmila Ya, i Mark L. Kempner. "Vibrations of Regular Ribbed Cylindrical Shells". W Foundations of Engineering Mechanics, 209–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-03126-7_11.

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Kapania, R. K., i P. Mohan. "Static and Free Vibration Analysis of Composite Plates and Shells Using a Flat Shell Element". W Contemporary Research in Engineering Science, 204–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-80001-6_13.

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Eliseev, Vladimir V., i Artem A. Moskalets. "Vibrations of Turbine Blades as Elastic Shells". W Advances in Mechanical Engineering, 53–60. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72929-9_7.

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Kalinina, Anna, Dmitry Kondratov, Yulia Kondratova, Lev Mogilevich i Victor Popov. "Investigation of Hydroelasticity Coaxial Geometrically Irregular and Regular Shells Under Vibration". W Recent Research in Control Engineering and Decision Making, 125–37. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12072-6_12.

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Soldatos, Kostas P. "Free Vibration Analysis of Thickness Shear Deformable Cross-Ply Laminated Oval Cylindrical Shells". W Lecture Notes in Engineering, 324–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-83040-2_28.

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Xie, Guanmo. "Free Vibration Analysis of Ring-Stiffened Cylindrical Shells Based on Transfer Matrix Method". W Recent Advances in Computer Science and Information Engineering, 739–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25789-6_100.

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Baghdasaryan, Gevorg, i Marine Mikilyan. "Natural Vibrations of Conducting Shells in a Stationary Magnetic Field". W Foundations of Engineering Mechanics, 109–30. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19162-1_4.

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Rudorf, Martin, Sebastian Oberst, Merten Stender i Norbert Hoffmann. "Bifurcation Analysis of a Doubly Curved Thin Shell Considering Inertial Effects". W Vibration Engineering for a Sustainable Future, 51–57. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-46466-0_8.

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Patnaik, S. Srikant, Tarapada Roy i D. Koteswar Rao. "Numerical Investigation of Vibration Characteristics and Damping Properties of CNT-Based Viscoelastic Spherical Shell Structure". W Vibration Engineering for a Sustainable Future, 231–38. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47618-2_29.

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Streszczenia konferencji na temat "Vibration of shells (engineering)"

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Toorani, M. H., i A. A. Lakis. "Flow-Induced Vibration of Anisotropic Cylindrical Shells". W ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39029.

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This paper deals with the vibration analysis of anisotropic laminated cylindrical shells conveying fluid. We focus on the axi-symmetric (n=0) and lateral (beam-like, n=1) vibration modes of the anisotropic cylindrical shells. Particularly important in this study is to obtain the natural frequencies of the fluid-structure coupled system and also to estimate the critical flow velocity at which the structure loses its stability. The coupled equations between the shell and the fluid are derived from a refined shell theory by taking into account the shear deformation effects. The displacement functions are obtained from the exact solution of refined shell equations and therefore the mass and stiffness matrices of the shell are determined by precise analytical integration. The added mass, stiffness and damping matrices of the fluid are obtained by an analytical integration of the fluid pressure over the liquid element. Thereafter, these matrices are coupled with the dynamic equation of the empty shell. The natural frequencies obtained with the shell partially or completely filled with liquid are in good agreement with those obtained experimentally and from other theories. The stability of the shell subjected to a flowing fluid is also studied. The shell’s anisotropy is discussed.
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Shi, Peng, i Rakesh K. Kapania. "Free Vibration of Curvilinearly Stiffened Shallow Shells". W ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63814.

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The free vibration of curvilinearly stiffened doubly curved shallow shells is investigated by the Ritz method. Base on the first order shear deformation shell theory and Timoshenko’s 3-D curved beam theory, the strain and kinetic energies of the stiffened shells are introduced. Numerical results with different geometrical shells and boundary conditions, and different stiffener locations and curvatures are analyzed to verify the feasibility of the presented Ritz method for solving the problems. The results show good agreement with those using the FE method.
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Fujita, Katsuhisa, i Makoto Kato. "Instability of an Axial Leakage Flow-Induced Vibration of Thin Cylindrical Shells Having Freely Supported End". W ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59491.

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When thin cylindrical shells having freely supported end at the downstream side such as heat-shielding shells of afterburners, labyrinth air seals, annular structures in large diameter pipings and valves are subjected to axial leakage flows, an unstable vibration and a fatigue failure are apt to be occurred. In this paper, the unstable vibration of thin cylindrical shells is analytically investigated considering the fluid structure interaction between shells and fluids flowing through a narrow passage. The coupled equation of motion between shells and fluids is derived using the Flu¨gge’s shell theory and the Navier-Stokes equation. Especially, focusing on the higher circumferential vibrations, the unstable phenomenon of thin cylindrical shells is clarified by using root locus based on the complex eigenvalue analysis by using the mode functions obtained by the exact solution based on the Flu¨gge’s shell theory. The influence of shell-dimensions and so forth on the threshold of the instability of the coupled vibration of shells and flowing fluids are investigated and discussed.
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Fujita, Katsuhisa, i Makoto Kato. "Unstable Vibration of Simply Supported Thin Cylindrical Shells Subjected to Axial Leakage Flows Using Flu¨gge’s Shell Theory". W ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59494.

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The unstable vibration of thin cylindrical shells subjected to axial leakage flows is investigated in this paper. Considering the fluid structure interaction between shells and fluids flowing through a narrow passage, the coupled equation of motion between shells and flowing fluids is derived using the Flu¨gge’s shell theory and the Navier-Stokes equation. Focusing on the vibrational characteristics of a thin cylindrical shell with both simply-supported ends, that are the axisymmetric vibration, the lateral vibration and the circumferential vibration, the unstable phenomenon of thin cylindrical shells are clarified by using the root locus based on the complex eigenvalue analysis. The numerical parameter studies on the shells with both simply-supported ends are performed taking the dimensions of shells, the characteristics of flowing fluids and the clearance of an annular gap as parameters. The influences of these parameters on the threshold of the instability of the coupled vibration between a shell and a flowing fluid are discussed.
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Zolotarev, Igor. "Vibration and Stability of Cylindrical Shells Containing Flowing Fluid". W ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39036.

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Natural frequencies and the thresholds for loosing the stability of thin-walled cylindrical shell conveying by flowing fluid are theoretically studied. Potential flow theory for fluid and 3D theory for thin shells are used. The shells of finite length are considered for the different case of boundary conditions at the edges of the shell, and their influence on the critical flow velocities for flutter are demonstrated. The fundamental importance of boundary conditions considered for fixing the edges of the cylindrical shell of finite length is shown. When the clamped - simply supported boundary conditions are assumed, the critical flow velocity for flutter is very low, even if the energy dissipation due to the fluid viscosity was taken into account.
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Li, Hua, i Kaiming Hu. "Fuzzy Controller for Active Vibration Control of Cylindrical Shells". W ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72140.

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Cylindrical shells are widely used engineering structures, such as pipelines, tubes, submarine shells, etc. The active vibration control of these structures are important methods for ensuring their performance. In this paper, a fuzzy logic controller was proposed for the active vibration control of cylindrical shells. Piezoelectric actuators were laminated on the shell surface for the generation of control force. Then, the mathematical model of the model control force were given based the inverse piezoelectric effects and modal summation method. The transfer equation of the controlled system was derived from the modal equation. The fuzzy logic controller was then designed, in which the centroid method was used for defuzification. The proposed controller was then implemented in Matlab/Simulink environment, followed by case studies to evaluate its performance. Numerical results shown the effectiveness of fuzzy logic controller on active vibration of smart cylindrical shells. For all evaluated cases, more than 33% of amplitude reduction were achieved.
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Karimi Mahabadi, Rayehe, i Firooz Bakhtiari-Nejad. "Optimization of Joined Conical Shells Based on Free Vibration". W ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65612.

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This work aims at utilizing genetic algorithm (GA) to pursue the optimization of joined conical shells based on free vibration. Semi-vertex angles of cones and fibre orientation of the laminated composite are considered as design variables. First, the model is simulated in ABAQUS, the model is validated by comparing its results to other obtained from the literature. Then the first non-zero natural frequency of isotropic joined conical shell is maximized by changing the two semi-vertex angles of cones. Last the fibre orientation of laminated joined shells are optimized to achieve the maximum natural frequency.
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Rahman, T., E. L. Jansen i P. Tiso. "A Finite Element Based Perturbation Method for Nonlinear Free Vibration of Composite Cylindrical Shells". W ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11302.

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In this paper a finite element based perturbation approach for nonlinear vibrations is presented that is applicable to shell structures with an arbitrary geometry. The approach is based on a perturbation method to approximate the frequency-amplitude relation in the nonlinear vibration analysis of general structures with an arbitrary geometry. The method is formulated using a functional notation, and is subsequently converted to a finite element notation. After the determination of the linear natural frequency and corresponding vibration mode, the perturbation approach yields the initial curvature of the frequency-amplitude relation with a modest additional computational cost. The perturbation approach has been implemented in a general purpose finite element code and applied in the finite element analysis of the nonlinear vibration behavior of composite cylindrical shells using a curved shell element. The finite element implementation of the approach for composite shells is described. Results for composite cylindrical shells are presented and compared with results obtained via semi-analytical methods published earlier by the second author.
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Amabili, M., i Ye Kurylov. "Nonlinear Vibrations of Cantilever Circular Cylindrical Shells". W ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28484.

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Only experimental studies are available on large amplitude vibrations of cantilever shells. In the present paper, large-amplitude nonlinear vibrations of cantilever circular cylindrical shell are investigated. Shells with perfect and imperfect shape are studied. The Sanders-Koiter nonlinear shell theory, which includes shear deformation, is used to calculate the elastic strain energy. Shell’s displacement fields (longitudinal, circumferential and radial) are expanded by means of a double mixed series: harmonic functions for the circumferential variable; Chebyshev polynomials for the longitudinal variable. Boundary conditions are exactly satisfied. The Lagrangian approach is applied to obtain a system of nonlinear ordinary differential equations. The nonlinear equations of motion are studied by using arclength continuation method and bifurcation analysis. Numerical responses in the spectral neighborhood of the lowest natural frequency are obtained.
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Deng, Bolei, Huiyu Li i Hornsen Tzou. "Flexoelectric Actuation and Vibration Control of Ring Shells". W ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47994.

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The converse flexoelectric effect that the gradient of polarization (or electric field) induces internal stress (or strain) can be utilized to control the vibration of flexible structures. This study focuses on the microscopic actuation behavior and effectiveness of a flexoelectric actuator patch on an elastic ring. An atomic force microscope (AFM) probe is placed on the upper surface of the patch to implement the inhomogeneous electric field inducing stresses inside the actuation patch. The flexoelectric membrane force and bending moment, in turn, actuate the ring vibration and its actuation effect is studied. Actuator’s influence in the transverse and circumferential directions is respectively evaluated. For the transverse direction, the gradient of the electric field decays quickly along the ring thickness, resulting in a nonuniform transverse distribution of the induced stress and such distribution is not influenced by the patch thickness. The flexoelectric induced circumferential membrane force and bending moment resembles the Dirac delta function at the AFM contact point. The influence of the actuator can be regarded as a drastic bending on the ring. To evaluate the actuation effect, dynamic response of controllable displacements of the elastic ring under flexoelectric actuation is analyzed by adjusting the geometric parameters, such as the thickness of flexoelectric patch, AFM probe radius, ring thickness and ring radius. This study represents a thorough understanding of the flexoelectric actuation behavior and serves as a foundation of the flexoelectricity based vibration control.
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Raporty organizacyjne na temat "Vibration of shells (engineering)"

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Hart, Carl. Vibration survey of Room 47 with a laser doppler vibrometer : Main Laboratory Basement, U.S. Army ERDC-CRREL. Engineer Research and Development Center (U.S.), listopad 2020. http://dx.doi.org/10.21079/11681/38919.

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Plans are underway to create an acousto-optic laboratory on the campus of the Cold Regions Research and Engineering Laboratory. For this purpose, existing space in the basement of the Main Laboratory will be renovated. Demanding measurement techniques, such as interferometry, require a sufficiently quiet vibration environment (i.e., low vibration levels). As such, characterization of existing vibration conditions is necessary to determine vibration isolation requirements so that highly sensitive measurement activities are feasible. To this end, existing vibro-acoustic conditions were briefly surveyed in Room 47, a part of the future laboratory. The survey measured ambient noise and ambient vertical floor vibrations. The ambient vibration environment was characterized according to generic velocity criteria (VC), which are one-third octave band vibration limits. At the time of the survey, the ambient vibration environment fell under a VC-A designation, where the tolerance limit is 2000 μin/s across all one-third octave bands. Under this condition, highly sensitive measurement activities are feasible on a vibration-isolated working surface. The conclusion of this report provides isolation efficiency requirements that satisfy VC-E limits (125 μin/s), which are necessary for interferometric measurements.
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Quinn, Meghan. Geotechnical effects on fiber optic distributed acoustic sensing performance. Engineer Research and Development Center (U.S.), lipiec 2021. http://dx.doi.org/10.21079/11681/41325.

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Distributed Acoustic Sensing (DAS) is a fiber optic sensing system that is used for vibration monitoring. At a minimum, DAS is composed of a fiber optic cable and an optic analyzer called an interrogator. The oil and gas industry has used DAS for over a decade to monitor infrastructure such as pipelines for leaks, and in recent years changes in DAS performance over time have been observed for DAS arrays that are buried in the ground. This dissertation investigates the effect that soil type, soil temperature, soil moisture, time in-situ, and vehicle loading have on DAS performance for fiber optic cables buried in soil. This was accomplished through a field testing program involving two newly installed DAS arrays. For the first installation, a new portion of DAS array was added to an existing DAS array installed a decade prior. The new portion of the DAS array was installed in four different soil types: native fill, sand, gravel, and an excavatable flowable fill. Soil moisture and temperature sensors were buried adjacent to the fiber optic cable to monitor seasonal environmental changes over time. Periodic impact testing was performed at set locations along the DAS array for over one year. A second, temporary DAS array was installed to test the effect of vehicle loading on DAS performance. Signal to Noise Ratio (SNR) of the DAS response was used for all the tests to evaluate the system performance. The results of the impact testing program indicated that the portions of the array in gravel performed more consistently over time. Changes in soil moisture or soil temperature did not appear to affect DAS performance. The results also indicated that time DAS performance does change somewhat over time. Performance variance increased in new portions of array in all material types through time. The SNR in portions of the DAS array in native silty sand material dropped slightly, while the SNR in portions of the array in sand fill and flowable fill material decreased significantly over time. This significant change in performance occurred while testing halted from March 2020 to August 2020 due to the Covid-19 pandemic. These significant changes in performance were observed in the new portion of test bed, while the performance of the prior installation remained consistent. It may be that, after some time in-situ, SNR in a DAS array will reach a steady state. Though it is unfortunate that testing was on pause while changes in DAS performance developed, the observed changes emphasize the potential of DAS to be used for infrastructure change-detection monitoring. In the temporary test bed, increasing vehicle loads were observed to increase DAS performance, although there was considerable variability in the measured SNR. The significant variation in DAS response is likely due to various industrial activities on-site and some disturbance to the array while on-boarding and off-boarding vehicles. The results of this experiment indicated that the presence of load on less than 10% of an array channel length may improve DAS performance. Overall, this dissertation provides guidance that can help inform the civil engineering community with respect to installation design recommendations related to DAS used for infrastructure monitoring.
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