scholarly journals Design of Perforated Shell Dryings Drums

2012 ◽  
Vol 2 (2) ◽  
Author(s):  
Heikki Martikka ◽  
Erkki Taitokari
Keyword(s):  
Perforated Shell

Analysis of a Circular Cylindrical Shell Perforated by a Large Number of Radial Holes

1967 ◽  
Vol 89 (3) ◽  
pp. 325-332
Author(s):  
J. B. Mahoney ◽  
V. L. Salerno
Keyword(s):  
Cylindrical Shell ◽  
Energy Density ◽  
Circular Cylindrical Shell ◽  
Orthotropic Cylindrical Shell ◽  
Elastic Strain Energy ◽  
Shell Element ◽  
Effective Stiffness ◽  
Stiffness Coefficients ◽  
First Case ◽  
Perforated Shell

The present paper considers a circular cylindrical shell perforated by many radially aligned circular holes that pierce its surface in repeating rectangular patterns (Fig. 1). Eight “effective” stiffness coefficients are developed for this configuration by comparing the elastic strain energy density for an idealized perforated cylindrical shell element (shown in Fig. 2) to the energy density of an orthotropic cylindrical shell element. General equations for the perforated shell element are obtained by utilizing these eight “effective” stiffness coefficients. The general set of equations is then reduced to the usual three partial differential equations in terms of the u, v, and w-displacements. This set of displacement equations is solved for two specific cases; the first case is the rotationally symmetric one where the shell is considered completely perforated; the second case is that of a partially perforated shell. Here a portion of a perforated shell is joined with a portion of an isotropic cylindrical shell along two edges, where θ is constant (see Fig. 4).

scholarly journals CALCULATION OF THE CYLINDRICAL WALLED PERFORATED SHELLS.

2015 ◽  
pp. 125-130
Author(s):  
Sergei I Trubachev ◽  
Olga N Аlekseychuk
Keyword(s):  
Numerical Calculation ◽  
Stress Concentration ◽  
Finite Elements ◽  
Strain State ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Equivalent Thickness ◽  
Definition Of ◽  
Perforated Shell

The stress-strain state of thick-walled cylindrical perforated shell under internal pressure is consider. Defined the reduced stiffness of the shell by defining an equivalent thickness. A numerical calculation using solid (3D) and shell finite elements is done. Analyzed stress-straine state of circle perforating holes and the thickness of the wall. Compared the stress-straine state obtained on solid three-dimensional model with the results for a shell with equvivalent stiffness. Were given advice on the definition of strass-straine state by using the eqvivalent stiffness considering stress concentration.

Buckling-Induced Retraction of Structured Spherical Shell under Pressure

2014 ◽  
Vol 553 ◽  
pp. 842-846
Author(s):  
Sen Lin ◽  
Shi Wei Zhou ◽  
Mike Xie ◽  
Xiao Dong Huang ◽  
Qing Li
Keyword(s):  
Spherical Shell ◽  
Final Stage ◽  
Soft Material ◽  
Explicit Method ◽  
Post Buckling ◽  
In The Beginning ◽  
Perforated Shell

This paper investigates the reversible retraction of a spherical perforated shell that is made from nonlinear soft material. The buckling and post-buckling simulation in Abaqus shows the skeleton ligaments of such a buckliball rotate in the beginning and buckle thereafter, resulting in the shrinkage and encapsulation of the whole structure in the final stage. We used dynamic-explicit method in the simulation and its superiority over others is verified by obtaining correct buckling patterns efficiently and stably.

Aboriginal serrated and perforated shell artefacts from the Murray River, South Australia

2021 ◽  
Author(s):  
AMY ROBERTS ◽  
CRAIG WESTELL ◽  
CHRISTOPHER WILSON ◽  
MICHELLE C. LANGLEY ◽  
RIVER MURRAY AND MALLEE ABORIGINAL CORPORATION ◽  
...  
Keyword(s):  
South Australia ◽  
Murray River ◽  
Perforated Shell

Toroidal pinch experiments with a perforated shell-type coil

1978 ◽  
Vol 98 (1) ◽  
pp. 15-20
Author(s):  
Juichi Irisawa ◽  
Takataro Hamajima ◽  
Noriyuki Shigeta ◽  
Yoshifumi Seno ◽  
Izumi Hayashi
Keyword(s):  
Shell Type ◽  
Perforated Shell

Design Recommendation for Large Depth-to-Span Ratio and Opening of Single-Layer Spericallattice Shells

2013 ◽  
Vol 351-352 ◽  
pp. 109-113
Author(s):  
Jun Zhang ◽  
Yi Shi ◽  
Guoang Xie
Keyword(s):  
Static Load ◽  
Design Method ◽  
Single Layer ◽  
Internal Force ◽  
Static And Dynamic Analysis ◽  
Large Depth ◽  
Current Design ◽  
Design Proposal ◽  
Design Recommendation ◽  
Perforated Shell

The application of perforated shell gradually increased, but the current design method has no explicit provisions. In this paper, based on large depth-to-span ratio and openings of single-layer spherical lattice shells structure for static and dynamic analysis, and the effects of opening and not opening shell difference of internal force under static load and deformation, I put forward the design proposal.

On the added mass of a perforated shell, with application to the generation of aerodynamic sound by a perforated trailing edge

1979 ◽  
Vol 365 (1721) ◽  
pp. 209-233 ◽  
Keyword(s):  
Oscillatory Flow ◽  
Added Mass ◽  
Radius Of Curvature ◽  
Trailing Edge ◽  
Trailing Edge Noise ◽  
Aerodynamic Sound ◽  
Solvable In Closed Form ◽  
Flow Through ◽  
Rigid Shell ◽  
Perforated Shell

This paper examines the theory of oscillatory flow through the perforated surface of a rigid shell. The Reynolds number based on the diameter of a typical perforation is sufficiently large that the flow may be assumed to be irrotational. The case in which the surface apertures are small on a scale of the local radius of curvature of the shell is discussed in detail, and a pair of integral equations is derived whose solutions determine the principal properties of the flow, and in particular the fluctuating inertial drag experienced by the shell. These equations are solvable in closed form only for relatively simple shell geometries. Application of the theory is made to the case of a spherical shell, and to the problem of sound generation by turbulence swept past the trailing edge of a perforated aerofoil. Numerical results are presented which support the view that significant reductions in the level of trailing edge noise are possible, and illustrate the dependence of the attenuation on the distribution of perforations.

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