Дисертації з теми "Conical shells"
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Sadr-Hashemi, Farshid. "Buckling of conical shells." Thesis, University College London (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685403.
Повний текст джерелаIfayefunmi, Olawale Friday. "Combined stability of conical shells." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569897.
Повний текст джерелаCaresta, Mauro Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "Structural and acoustic responses of a submerged vessel." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2009. http://handle.unsw.edu.au/1959.4/44404.
Повний текст джерелаSpagnoli, Andrea. "Buckling behaviour and design of stiffened conical shells under axial compression." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/8821.
Повний текст джерелаSteyn, Brett Kenneth. "The effect of weld-induced imperfections on the buckling behaviour of spherical and conical shells." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/4999.
Повний текст джерелаThe early research was on general imperfections most commonly in the form of the lowest buckling modes. The use of steel pates to fabricate silos in a regular pattern led to the civil engineering interest in the weld-induced imperfection. This imperfection was found to be in the circumferential direction and the dominant cause for the reduction of the classical buckling load. As previous research was conducted on cylindrical shells the current thesis focused on studying two different shell geometries.
Low, Hwee Min Charles. "Computation of acoustic scattering from elastic conical shells with endcaps using the hybrid finite element/ virtual source approach." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33421.
Повний текст джерелаIncludes bibliographical references (p. 101-102).
Studying and understanding acoustic scattering pattern from underwater targets has been of interest to various communities such as the archeologists and the navy for several reasons and applications. The present state-of-the-art technique in this area involves such methods as analytical approach and FEM/BEM numerical technique. This thesis aims to study and demonstrate the power of using the hybrid virtual source/FE approach where the physical presence of a target is replaced by virtual sources placed in the vicinity of the target and in a manner where the pressure/displacement relationship on the target surface is satisfied by the virtual sources when the target is being insonified. Accurate results for the far-field radiation of the target can be obtained by superposition of the point source Green's function of each virtual source. The hybrid virtual source/FE approach shows potential to be a computationally efficient method for computing acoustic scattering. The derivation of the dynamic flexibility matrix for an elastic conical shell with endcaps will be illustrated in this thesis. It will be shown that the dynamic flexibility matrix corresponds to the acoustic admittance matrix in the virtual source approach where the scattering functions are computed in the MIT's program OASES/SCATT.
(cont.) Moreover, the benchmarking and validation of the approach will be conducted with the hybrid analytical/ virtual source approach. Firstly, the approach predicts natural frequencies close to the theoretical analysis for higher order modes with more than 2 circumferential transverse vibration lobes. Secondly, it produces displacement profile that conforms to analytical results. The scattering functions are also in agreement those computed by the hybrid analytical/ virtual source approach, with discrepancies observed at lower frequencies. In exact terms, discrepancies start to appear for frequency in the range of 1000 to 2000 Hz for a 0.01m thick, 2 m long, 0.3m radius steel cylinder without endcaps. The scattering functions will be compared with the SCATT/OASES virtual source approach for pressure release and rigid cylinders and cones. For the hybrid FE/virtual source approach, the structural sound speed and density approach zero and infinity for pressure-release and rigid target respectively. On the other hand, in the SCATT/OASES virtual source approach, the pressure and displacement are required to vanish on the target surface respectively. It will be shown that the two approaches agree with each other.
(cont.) Moreover, scattering functions over steel cones and cylinders for various frequencies have also been derived in this research. The results will be interpreted physically and theoretically in this thesis. The importance of including structural damping in the finite element formulation of the target so as to reflect the effect of resonance on scattering will be illustrated. Other issues, such as effect of target orientations on scattering, will also be investigated in this thesis. The code has shown good potential for adaptation to compute scattering over other axisymmteric shapes using conical shells and circular plates as building blocks and the hybrid FE/ virtual source approach.
by Hwee Min Charles Low.
S.M.
Rossetti, Luigi <1978>. "Static analysis of functionally graded cylindrical and conical shells or panels using the generalized unconstrained third order theory coupled with the stress recovery." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5749/1/Rossetti_Luigi_tesi.pdf.
Повний текст джерелаRossetti, Luigi <1978>. "Static analysis of functionally graded cylindrical and conical shells or panels using the generalized unconstrained third order theory coupled with the stress recovery." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5749/.
Повний текст джерелаCastro, Paullo Giovani Pereira [Verfasser]. "Semi-analytical tools for the analysis of laminated composite cylindrical and conical imperfect shells under various loading and boundary conditions / Paullo Giovani Pereira Castro." Clausthal-Zellerfeld : Universitätsbibliothek Clausthal, 2015. http://d-nb.info/1066715157/34.
Повний текст джерелаDapic, Ignacio. "Numerical Model for the Lateral Compression Response of a Plastic Cup." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34750.
Повний текст джерелаMaster of Science
Bleyer, Jérémy. "Méthodes numériques pour le calcul à la rupture des structures de génie civil." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1043/document.
Повний текст джерелаThis work aims at developping efficient numerical tools for a more rational and less empirical assessment of civil engineering structures yield design. As opposed to traditionnal methodologies relying on combinations of elastic computations, safety coefficients and local checking of critical members, the yield design theory seems to be a very promising tool for a more rigourous evaluation of structural safety. Lower bound static and upper bound kinematic approaches of the yield design theory are performed numerically using dedicated finite elements for plates in bending and shells in membrane-bending interaction. Corresponding optimization problems are then solved using very efficient conic programming solvers. The proposed tools are also extended to the framework of periodic homogenization in yield design, which enables to tackle the case of strong material heterogeneities. Numerical procedures are specifically tailored to compute equivalent homogeneous strength criteria and to use them, in a second step, in a computation at the structural level. Finally, the potentialities of the yield design approach are illustrated on two complex engineering problems : the stability assessment of high-rise reinforced concrete panels in fire conditions and the computation of the Paris-Austerlitz railway station canopy
Kotík, Libor. "Konstrukce sila na cukr." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227611.
Повний текст джерелаHung, Yu-Chang, and 洪余長. "ASYMPTOTIC THEORY OF LAMINATED CIRCULAR CONICAL SHELLS." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/60148966708607480565.
Повний текст джерелаWu, Yi-Hsien, and 吳宜憲. "A generalized thermoelasticity problem of multilayered conical shells." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/03079841614371827940.
Повний текст джерела國立中興大學
應用數學系
92
The problem of the two-dimensional axisymmetric quasi-static coupled thermoelastic transient response for the laminated circular conical shells and rotating annular multilayered cylinder subjected to arbitrary boundary conditions is presented. The analysis is carried out using a hybrid Laplace transformation and finite difference method. The present method divides the governing differential equations and boundary conditions into the finite difference method and then removes the time dependences from the discretized equations with the Laplace transform. The solutions were obtained by using the matrix similarity transformation and inverse Laplace transform. To demonstrate the proposed method’s validity, a series of problems of the thermoelastic transient response are evaluated as three categories: (1) the problems of laminated circular conical shells based on the curvilinear circular conical coordinates; (2) the problems of the laminated circular conical shells with clamped surface subjected to an internal blasting pressure and the external cooling process; (3) the problems of a rotating annular multilayered cylinder with inner and outer surfaces subjected to internal pressure in the inner surface and external cooling process in the outer surface. It was shown that the solutions are rapidly convergent. When applied to many nodes it takes an excessive amount of computer time. The present hybrid method can obtain stable solutions at a specific time; thus it is a further concluded that the method and the computing process of the generalized coupled transient thermoelastic problems are powerful and efficient. Solutions for the temperature, displacement and thermal stress distributions in both transient and steady state are obtained. Moreover, the effects of the different rotational speeds on these numerical results with the rotating annular multilayered cylinder were also discussed.
Khatri, Kamal N. "Vibration and damping analysis of multilayered conical shells." Thesis, 1989. http://localhost:8080/iit/handle/2074/4961.
Повний текст джерелаChen, Chia-Yu, and 陳家宇. "Bending Analysis of Laminated Conical Shells by Love's Theory." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/x83y83.
Повний текст джерела國立成功大學
土木工程學系碩博士班
90
The paper exams bending analysis of laminated conical shells by Love掇 classic shell theory (CST) using the method of differential quadrature (DQ). It shows stresses, strains and displacements for different thickness, shape and laminae arrangements. By Fourier expansion, the stiffness coefficients are assumed to be the functions of longitudes. By vanishing the semivertex angle (a), the conical shells are reduced to the cylindrical. In DQ methods, the governing equations and the corresponding boundary conditions are replaced by a set of algebraic equations with the function values at all the sampling points. The figures show the conducts of the various structure and the tables show the details.
Lin, Chi-Hao, and 林啟豪. "Thermal stresses analysis of composite laminated circular conical shells." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/2hvq2h.
Повний текст джерелаShadmehri, Farjad. "Buckling of Laminated Composite Conical Shells; Theory and Experiment." Thesis, 2012. http://spectrum.library.concordia.ca/974742/4/Shadmehri_PhD_F2012.pdf.
Повний текст джерелаCheng, Min Yuan, and 鄭敏元. "AN ASSESSMENT OF SHELL THEORIES FOR THE FREE VIBRATION ANALYSIS OF LAMINATED CONICAL SHELLS." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/11321500931277444969.
Повний текст джерела國立成功大學
土木工程學系
89
With comparison of the recently available three-dimensional (3D) elasticity solution, four classical shell theories (CST) (i.e., Donnell’s, Love’s and Sanders’ theories) and their extensions to the first-order shear deformation theories (FSDT) are assessed for the free vibration analysis of laminated conical shells. The simplifications of the initial curvature term made in the basic equations for various CST/FSDT are examined. The governing equations of various CST/FSDT are derived and expressed in terms of the displacement components. The distinctions among various CST/FSDT are made with the Kronecker’s Delta. The method of differential quadrature (DQ) is adopted for obtaining the solutions of various CST/FSDT. The present formulations of various CST/FSDT are applicable to the analyses of laminated cylindrical shells and annular plates by letting the semivertex angle of the cone are identical to and , respectively. The natural frequencies of isotropic annular plates, cross-ply cylindrical and conical shells with simply supported—simply supported (S-S) boundary conditions obtained from various CST/FSDT are computed. A parametric study for the effects of lamination schemes and geometrical parameters on the least natural frequency and the corresponding vibration mode is carried out to evaluate the performance of various CST/FSDT.
Li, Shi-Yu, and 李仕宇. "Vibration Analysis of Conical Shells by the Differential Quadrature Method." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/61345671565826841753.
Повний текст джерела國立成功大學
航空太空工程學系碩博士班
94
In this thesis, the free vibration behavior of truncated conical shells based on the Love’s thin shell theory is investigated by using the differential quadrature method (DQM). By using the DQM, the equations of motion of free vibration of conical shells in the differential form are reduced into algebraic equations. A new weighting matrix is obtained through natural coordinate transformation. To evaluate the accuracy of the new weighting matrix used in DQM, numerical results obtained by the DQM are compared with those in the literature. Furthermore, effects of the semi-vertex angle and the ratio of truncation on the natural frequency of truncated conical shells are studied. Numerical results show the superb accuracy, efficiency, and convenience of the DQM.
LEE, CHIA-YING, and 李佳穎. "DIFFERENTIAL QUADRATURE SOLUTION FOR THE FREE VIBRATION ANALYSIS OF LAMINATED CONICAL SHELLS." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/09765317511943036172.
Повний текст джерелаWu, Chang-Hsing, and 吳長興. "ASYMPTOTIC DIFFERENTIAL QUADRATURE SOLUTIONS FOR THE FREE VIBRATION OF LAMINATED CONICAL SHELLS." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/48803772307670426995.
Повний текст джерелаHui-ShengZhang and 張會昇. "Maximization of the Fundamental Frequencies of Axially Compressed Rotating Laminated Truncated Conical Shells." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/73596688362818305225.
Повний текст джерела國立成功大學
土木工程學系
102
Composites possess light weight, high strength, high stiffness, corrosion resistance, low thermal conductivity and other superior characteristics. Composites is widely used in a variety of engineering structures. To avoid structures producing resonance phenomenon and to avoid materials exceeded the allowable limits, the natural frequency analysis of composites structures is essential topics. In this study, using finite element analysis software ABAQUS to analyze laminated truncated conical shells’s fundamental frequency. Subjected to the different boundary conditions ,geometric shapes, the axial pressure, rotational speed. The Golden section method is employed to find the optimal fiber orientations and its corresponding maximum fundamental frequency in the composite laminated cylindrical shells. Design a compressed rotating laminated truncated conical shell,which can avoid the incidence of resonance phenomena. Select the appropriate angle and geometry of the fiber to improve the fundamental frequency of laminated truncated conical shells. The research results are valuable to the industry.
Lai, Cheng-Hung, and 賴政宏. "Free Vibration Analysis of Rotating Truncated Conical Shells by the Differential Quadrature Method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/52792734815655275721.
Повний текст джерела國立成功大學
航空太空工程學系碩博士班
95
In this thesis, the free vibration behavior of rotating truncated conical shells based on Love’s thin shell theory is studied by using the differential quadrature method (DQM). The governing equations of motion of free vibration of rotating truncated conical shell in the differential form are reduced to a set of algebraic equations by applying the differential quadrature formulation. Natural frequencies of the rotating truncated conical shells are obtained. The accuracy of the DQM is assured by comparing numerical results obtained by the DQM with results in the literature. Furthermore, effects of boundary conditions, semi-vertex angle and the ratio of truncation on the natural frequencies of rotating truncated conical shells are studied. Numerical results show the efficiency, good accuracy, and convenience of the DQM.
Chung, Youngjin. "Buckling of composite conical shells under combined axial compression, external pressure, and bending." Thesis, 2001. http://library1.njit.edu/etd/fromwebvoyage.cfm?id=njit-etd2001-099.
Повний текст джерелаShao-PinWu and 吳紹彬. "Application of moving least square method for large deformation analysis of the conical shells." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/f85cb4.
Повний текст джерела國立成功大學
土木工程學系
103
In this article, the assumption of first-order shear deformation and the principle of virtual work are employed to derive large deformation theory of conical shells. With the quasi-Hermite type formulation in moving least squares method (MLS), it can handle equilibrium equations, constitutive relations, to get the numerical solution. When solving the numerical solution, nonlinear equilibrium equations of the conical shells under large deformation is linearized by using the Newton-Raphson method, and using the iterative process to approximate it, and calculate the resulting force, and bending moments after large deformation. The numerical examples of the nonlinear behavior of conical shells are discussed, it include the buckling behavior of conical shells, nonlinear behavior of the shell under internal pressure, and the snap through behavior of opened conical shell.
Hao-YangHuang and 黃浩洋. "Semi-Analytical Finite Element Methods for the Analysis of Functionally Graded Truncated Conical Shells." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/g79xyg.
Повний текст джерела國立成功大學
土木工程學系
107
Based on the Reissner’s mixed variational theorem (RMVT), a semi-analytical finite annular prism method (FAPM) is developed for three-dimensional (3D) static analyses of bi-directional functionally graded (FG) truncated conical shells. The material properties of the FG truncated conical shell are assumed to obey a bi-directional power-law distribution of the volume fractions of the constituents through the meridian-thickness surface, the effective material properties of which are estimated using the rule of mixtures. Implementation of the current FAPMs shows their solutions converge rapidly and that the convergent solutions are in excellent agreement with the 3D solutions available in the literature.
Hung-YiWang and 王弘毅. "Large deformation analysis of the conical shells by the arc-length and moving least squares methods." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/20953766042620631246.
Повний текст джерела國立成功大學
土木工程學系
104
In this thesis, the nonlinear theory for the large deformation of conical shells is investigated under the assumption of the first order shear deformation using the principle of virtual work. The functions of constitutive equations and equilibrium equations are linearized by the arc-length method and analyzed using the moving least squares approximation in the quasi-Hermite type formulation. Then, the deformed configurations and the associated forces will be obtained after the iterations. The numerical examples of the nonlinear behavior of conical shells are discussed in the study, and they includes the buckling behavior of conical shells, nonlinear behavior of the shell under internal pressure, and the snap-through behavior of the opened conical shell.
O, Sheng-Chang, and 歐勝昌. "Influence of Geometry and End Conditions on Optimal Funddmental Natural Frequencies of Symmetrically Composite Laminated Conical Shells." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/84903223477983172104.
Повний текст джерелаDai, Po-Chang, and 戴伯璋. "Large Deformation Theory of Conical Shell." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/39676001409061363205.
Повний текст джерела國立成功大學
土木工程學系碩博士班
94
Abstract In this paper, form the configurations of the opened conical shell before and after deformed, we derive its strains and equilibrium equations under large displacement. Using the coordinates of the middle surface of the open conical shell and its transverse shear strains as the field functions, five nonlinear partial differential equations are established for the system. To solve those nonlinear equations, we adopt the Newton-Raphson method to linearlize the differential equations and using the differential reproducing kernel method to solve the linearlized differential equations. A numerical solution for snap-through for the opened conical shell under two different boundry conditions.
YAN, WEN-XI, and 顏文禧. "Electromagnetic scattering by a thin conducting conical shell." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/44720321797343379152.
Повний текст джерелаPatel, Mrityunjay Prasad. "Vibration Analysis of Functionally Graded Nanocomposite Conical Shell Structures." Thesis, 2015. http://ethesis.nitrkl.ac.in/7161/1/Vibration_patel_2015.pdf.
Повний текст джерела