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对旋转组合壳体的各个子区的位移场进行双三次B样条插值,同时对子区交界处的广义力向量以单三次B样条展开,推导出以广义向量表示的组合壳体的平衡方程,然后从Beti互换定理和虚功原理出发推导出离散的壳体结构中可能的塑性应变率循环,从而给出了组合壳体安定上限分析的有限元列式,把组合壳体的安定上限分析归结为求解一个数学规划问题,文末给出了算例  相似文献
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It is established that the vibrations of a rotating shell excite the vibrations of the whole system consisting of a cylindrical shell, an electric motor, and a reducer on a common elastic base. It is shown that the vibrational accelerations excited by two different methods approach each other when the angle of the shell axis changes __________ Translated from Prikladnaya Mekhanika, Vol. 41, No. 8, pp. 118–121, August 2005.  相似文献
3.
In this paper, based on the nonlinear thin shell theory, a geometrically nonlinear formulation using the total Lagrangian approach for rotational shells, as well as rotational shells on the Winkler-type elastic foundation, is presented. The displacements of the middle surface are approached by a B-spline function. All nonlinear terms of membrane strains are reserved. Two cases in which the arc length as well as ordinate is used as the coordinate parameter along meridional direction are discussed at the same time.The project supported by National natural Science Foundation of China.  相似文献
4.
IntroductionInengineering,thenonlinearityofshellstructureissometimesobvious.Itisverydifficulttosolvetheproblemofthenonlinearrandomvibration .Inthispaper,wetrytosolveitinthefrequencydomainbyanimprovedstatisticlinearizationmethod .Weconsideronlythegeometr…  相似文献
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IntroductionByadoptingtheenergymethod,anewmethodtocalculatethestabilityofthecompositeshellofrevolutionispresented.Thismethodtakestheinfluenceofnonlinearprebucklingdeformationsandstressesonthebucklingoftheshellintoaccount.Therelationshipsbetweenthepreb…  相似文献
6.
The dynamic behaviors of rotating shells coupled with liquid are shown. The shell under consideration has arbitrary boundary conditions and a complex shape. A modified boundary element method and finite strip technique are used to improve the computing efficiency and to guarantee the continuity conditions on the liquid-shell interaction plane. The effects of various parameters such as shell's thickness and liquid depth are investigated. Dynamic simulations are applied to several typical shell-liquid systems, and the natural frequencies, mode shapes and response of vibration are calculated numerically. Project supported by the National Natural Science Foundation of China (No. 19702004).  相似文献
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The first order differential matrix equations of the host shell and constrained layer for a sandwich rotational shell are derived based on the thin shell theory.Employing the layer wise principle and first order shear deformation theory, only considering the shearing deformation of the viscoelastic layer, the integrated first order differential matrix equation of a passive constrained layer damping rotational shell is established by combining with the normal equilibrium equation of the viscoelastic layer.A highly precise transfer matrix method is developed by extended homogeneous capacity precision integration technology.The numerical results show that present method is accurate and effective.  相似文献
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A numerical study of tangential layers in steady‐state magnetohydrodynamic rotating flows is presented using CFD to solve the inductionless governing equations. The analysis considers two basic flow configurations. In the first, a fluid is enclosed in a cylinder with electrically perfect conducting walls and the flow is driven by a small rotating, conducting disk. In the second, a flow is considered in a spherical shell with an inner rotating sphere. The fluid in both cases is subjected to an external axial uniform magnetic field. The results show that these flows exhibit two different types of flow cores separated from each other by a tangential layer parallel to the axis of rotation. The inner core follows a solid‐body rotation while the outer is quasistagnant. A counter‐rotating jet is developed in the tangential layer between the cores. The characteristics of the tangential layer and the properties of the meridional motion are determined for a wide range of Hartmann numbers. Distributions of angular velocity of circumferential flow and electric potential are obtained and the results are compared with those of analytic methods. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献
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