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Spherical shell

About: Spherical shell is a research topic. Over the lifetime, 5572 publications have been published within this topic receiving 71807 citations.


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Patent
21 Jun 2019
TL;DR: In this paper, the authors described a circulating spherical shell with sensors attached to the spherical shell and connected with the temperature acquisition display instrument through connecting wires, and the surface temperature of a spherical shell is constant and uniform through temperature conduction.
Abstract: The invention discloses a novel circulating spherical shell device. The device comprises a spherical shell with the interior full of constant-temperature oil, sensors, a temperature acquisition display instrument and a workbench. The sensors are attached to the spherical shell and connected with the temperature acquisition display instrument through connecting wires. A second inner pipe containingconstant-temperature oil is arranged on one side of the spherical shell horizontally, and a rectangular oil return pipe used for recovering constant-temperature oil is arranged at the upper end of the inner wall of the spherical shell. Since the interior of the spherical shell is full of the constant-temperature oil, the surface temperature of the spherical shell is constant and uniform through temperature conduction of the constant-temperature oil, and a heat source with the constant and uniform surface temperature is formed.
Journal ArticleDOI
TL;DR: In this paper, a rotating spherical shell is simulated numerically using a code developed by Tilgner and Busse, and the authors find that the thermal stratification is convectively unstable in the outer part and stable in the inner part of the shell.
Abstract: Magnetoconvection in a rotating spherical shell is simulated numerically using a code developed by Tilgner and Busse. The thermal stratification is convectively unstable in the outer part and stable in the inner part of the shell. Regimes are found in which the convective flow is weakly affected by rotation and preserves its cellular structure. The dipolar component of the large-scale magnetic field exhibits undamped oscillations. It appears that convection cells slightly modified by rotation can be building blocks of the global dynamo. The generation of the magnetic field is thus due to regular "macroscopic" flows, and their structure itself may ensure the presence of the α effect responsible for the action of the dynamo. Such dynamos can be called deterministic, in contrast to those in which the maintenance of the magnetic field is related to the statistical predominance of a certain sign of helicity in the turbulent velocity field. Investigation of conditions under which dynamos of this sort can operate could suggest a more definite answer to the question of the origin of solar and stellar magnetic fields.
Patent
12 Jun 2018
TL;DR: In this article, a wall thickness homogenization method adopting isothermal stamping for a titanium alloy thick-wall spherical shell was proposed, which is applicable to the development and production of a TA7 low-temperature titanium alloy gas cylinder product for a carrier rocket.
Abstract: The invention discloses a wall thickness homogenization method adopting isothermal stamping for a titanium alloy thick-wall spherical shell. Through divisional design on friction coefficients of a male die and a to-be-formed plate, the male die and pull rings are heated separately so that a temperature gradient is formed, the wall thickness homogenization of the titanium alloy thick-wall sphericalshell is ensured, the spherical bottom reduction rate is reduced from 50% in conventional forming to below 15%, the overall wall thickness fluctuation of a housing does not exceeds 30% of the wall thickness of a blank and the size is stable. Since the reduction of the spherical bottom is inhibited effectively, the extent of damage of the mechanical property at the spherical bottom is reduced substantially, the overall mechanical property of the titanium alloy thick-wall spherical shell is better, the titanium alloy thick-wall spherical shell is particularly applicable to development and production of a TA7 low-temperature titanium alloy gas cylinder product for a carrier rocket, and is also applicable to the development and production of titanium alloys in other fields and other trademarks and the like products, and the wall thickness homogenization method is very practical.
Patent
14 Jun 2019
TL;DR: In this article, a compound spherical shell of a spherical robot is presented, which consists of a rigid substrate shell and a flexible coating layer, wherein the rigidsubstrate shell is made of structural type fiber reinforced compound material and is compounded by reinforced fibers and a thermosetting resin substrate.
Abstract: The invention provides a compound spherical shell of a spherical robot. The compound structure of the spherical shell comprises a rigid substrate shell and a flexible coating layer, wherein the rigidsubstrate shell is made of structural type fiber reinforced compound material and is compounded by reinforced fibers and a thermosetting resin substrate; a honeycomb-shaped stiffening rib is arrangedon the inner surface of the rigid substrate shell, is made of thermosetting resin and can be subjected to integral hot press molding with the rigid substrate shell; the flexible coating layer is madeof copolymer elastomer materials. The light compound spherical shell has high specific strength, specific stiffness, rolling friction coefficients and impact energy dissipation factors and also has aquick repairing function. The spherical shell and the corresponding spherical robot serve as an open type automatic control platform, and various functional spherical robots can be developed and derived on the basis of the compound spherical shell of the spherical robot.
Journal ArticleDOI
TL;DR: A variational approach to calculate shells with crack-cuts based on a nonclassical Timoshenko-type theory is proposed and realized in this paper, where compliance and virtual crack growth methods are proposed and developed for calculating the stress intensity factor, which is the main characteristic of the local stress field at the crack tip.
Abstract: A variational approach to calculating shells with crack-cuts based on a nonclassical Timoshenko-type theory is proposed and realized. Compliance and virtual crack growth methods are proposed and developed for calculating the stress intensity factor, which is the main characteristic of the local stress field at the crack tip. These methods are realized by the finite-element method in the displacement and finite-difference variant. Analytical and mathematical models of the crack-cut are proposed. A spherical shell with one and two through cracks rectilinear in plan and a square cylindrical panel with a crack located in the center of the diagonal were calculated.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202348
202294
2021117
2020161
2019203
2018212