共查询到11条相似文献,搜索用时 78 毫秒
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建立了一种纵横加肋圆柱壳有限元分析的正确的力学模型,通过大量数值计算,论证了纵骨尺寸,纵骨间距对壳体应力状态的影响,提出了一种等效各向同性壳的近似解析公式,为开展纵横加肋圆柱壳的结构设计打下了良好的基础。 相似文献
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水下环向双周期加肋圆柱壳体的自由振动 总被引:4,自引:0,他引:4
以浸没于水中的弹性环向双周期加肋薄圆柱壳为研究对象,考虑介质与结构振动的耦合效应,研究流固耦合系统的自由振动。基于Kennard薄壳理论、Helmholtz方程以及壳壁外表面的运动协调条件,并借助Dirac-δ函数引进肋骨对壳体的作用,从而建立耦合系统的运动方程。通过富氏积分变换、引进算子,并利用算子的周期性,得到系统的频率方程。采用沿实波数轴搜索求根的方法,重点计算了水下无限长环向双周期加肋柱壳的自由传播波频率系数,并进一步研究了流场和肋参数对壳体固有频率的影响。 相似文献
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E. K. Ankyanets 《International Applied Mechanics》2005,41(10):1177-1181
The vibrations of a cylindrical shell reinforced with circular ribs attached to it by means of discrete elastic elements are
studied. The problem is solved by the finite-element method. The shell and ribs are modeled by a plane four-node finite element,
which is a combination of a four-node plane stress element and a four-node flexural element. The effect of the stiffness of
the elastic elements on the natural frequencies and modes is examined
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Translated from Prikladnaya Mekhanika, Vol. 41, No. 10, pp. 108–113, October 2005. 相似文献
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Y.K. Suh 《Theoretical and Computational Fluid Dynamics》2000,14(2):109-134
A fluid flow with a free surface inside a circular cylinder subjected to horizontal, circular oscillation was analyzed theoretically
and numerically under the assumption of small-amplitude oscillation and high Reynolds number. It was shown that the nature
of the oscillatory flow is of a standing-wave type when projected onto the axial plane and of a progressive-wave type when
projected onto the azimuthal plane. The Stokes drift motion in the azimuthal direction and the steady streaming velocity at
the edge of the bottom- and side-wall boundary layers are then used in the numerical computation for the steady axisymmetric
recirculatory flow outside the boundary layers. We have found that the solutions can be well predicted by asymptotic analysis
for the full Navier–Stokes equations in the low streaming-Reynolds-number limit. A simple experiment on flow visualization
revealed a good agreement in the surface flow pattern on the bottom wall. It also provided steady recirculatory flows that
were not much different from the numerical results on the whole.
Received 16 August 1999 and accepted 14 January 2000 相似文献
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本文用有限差分法对在轴对称荷载作用下的圆形折板壳屋盖进行静力分析,得到沿壳体径向内力。然后按GB110-89进行配筋及裂缝宽度、刚度计算。用BASIC语言,在SHARP PC-1500上实现。 相似文献
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I. E. Kareva V. L. Sennitskii 《Journal of Applied Mechanics and Technical Physics》2001,42(2):276-278
The motion of a circular cylinder under gravity in an ideal liquid bounded from the outside by a vibrating wall is determined using numerical methods. 相似文献
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Charles Mockett Rodolphe Perrin Thorsten Reimann Marianna Braza Frank Thiele 《Flow, Turbulence and Combustion》2010,85(2):167-180
A detailed validation study is presented for the detached-eddy simulation (DES) of the flow around a circular cylinder at
a high sub-critical Reynolds number. Good comparability with unsteady experimental field data is facilitated by the confined
and clearly-defined geometry, although some uncertainty remains regarding the free stream turbulence intensity. The combination
of DES with an appropriate low-dissipative hybrid numerical convection scheme and high temporal resolution delivers excellent
agreement with the experiment for the time and phase-averaged fields as well as the spectral content. A strong sensitivity
of the solution to the numerical time step size has been identified, which is attributed to time-filtering effects damping
the development of resolved turbulence in the early shear layer. Recommendations are made concerning a CFL-type criterion
for the temporal resolution of DES and future studies involving a still finer time step are outlined. 相似文献
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The analysis of a sandwich shell having a thick core and thin outer and inner layers (facings) and subjected to axisymmetric loads is considered. The problem is solved by applying the three-dimensional theory of elasticity to the core and the classical thin shell theory for the outer and inner facings. The displacement and stress continuity conditions are satisfied along the junctions of the facings and core. The results obtained from this solution have been compared with the results obtained from the sandwich shell theory of Fulton. 相似文献