scholarly journals Study on the Coupling Frequency of Double-Sided Submerged Ring-Stiffened Cylindrical Shells

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Anbin Yu ◽  
Yinglong Zhao ◽  
Youqian Wang ◽  
Ben Zhang
Keyword(s):  
Cylindrical Shell ◽  
Free Surface ◽  
Hydrostatic Pressure ◽  
Water Immersion ◽  
Theoretical Method ◽  
Coupling Model ◽  
Acoustic Vibration ◽  
Stiffened Cylindrical Shell ◽  
Calculation Results ◽  
Coupling Frequency

Based on the Flügge theory and orthotropic theory, the acoustic vibration coupling model of ring-stiffened cylindrical shell is established by using the wave propagation method and virtual source method. And the effects of water immersion on both sides, free surface, and hydrostatic pressure on the cylindrical shell are considered in the coupling model. Muller three-point iterative method is used to solve the coupling frequency. The calculation results of degradation theory are compared with COMSOL’s calculation results and experimental results, respectively, which verifies the reliability of the theoretical method. Finally, the influence of fluid load, ring rib parameters, boundary conditions, hydrostatic pressure, and free surface on the coupled vibration of ring-stiffened cylindrical shell is analyzed by an example.

Structural Analysis of Pressure Hulls: Rib-Stiffened Cylindrical Shell With Reinforced Circular Penetration

1972 ◽  
Vol 39 (4) ◽  
pp. 1072-1078 ◽  
Author(s):  
R. F. Maye ◽  
J. A. Euler ◽  
L. M. Habip
Keyword(s):  
Experimental Data ◽  
Cylindrical Shell ◽  
Structural Analysis ◽  
Hydrostatic Pressure ◽  
Model Tests ◽  
Numerical Results ◽  
Radius Ratio ◽  
Stiffened Cylindrical Shell ◽  
Photoelastic Model

A solution for the stresses in a rib-stiffened cylindrical shell with a reinforced circular penetration under hydrostatic pressure valid for a penetration radius to shell radius ratio less than or equal to 1/3 is presented. Numerical results for the unstiffened as well as the stiffened case are compared graphically with experimental data available from certain photoelastic model tests.

Buckling Analysis for a Ring-Stiffened FGM Cylindrical Shell Under Hydrostatic Pressure and Thermal Loads

2014 ◽  
Vol 30 (4) ◽  
pp. 403-410 ◽  
Author(s):  
H.-L. Dai ◽  
L.-L. Qi ◽  
H.-Y. Zheng
Keyword(s):  
Cylindrical Shell ◽  
Hydrostatic Pressure ◽  
Buckling Analysis ◽  
Functionally Graded ◽  
Thermal Loads ◽  
Temperature Dependent ◽  
Stiffened Cylindrical Shell ◽  
Buckling Behavior ◽  
Graded Material ◽  
The Galerkin Method

AbstractThis paper studies the buckling analysis for a ring-stiffened cylindrical shell consisted of functionally graded material (FGM) subjected to hydrostatic pressure and thermal loads. Material properties of the ring-stiffened FGM cylindrical shell are assumed to be temperature-dependent, and vary smoothly through the thickness direction of the structure according to a volume exponent. Based on the Donnell assumptions, buckling loads of the ring-stiffened FGM cylindrical shell are presented by utilizing the Galerkin method. Numerical results reveal that thermal loads, volume exponent and geometric parameters have significant effects on the buckling behavior of the ring-stiffened cylindrical shell.

Investigation on the Structure Strength and Stability of Ring Stiffened Cylindrical Shell With Long Compartment and Large Stiffener

2017 ◽  
Author(s):  
Yan Feng ◽  
Hui Li ◽  
Chenfeng Li ◽  
Junjie Ruan ◽  
Qiyou Zhang ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Shell Structure ◽  
Failure Modes ◽  
High Strength Steels ◽  
High Strength ◽  
Theoretical Method ◽  
Utilization Efficiency ◽  
Stiffened Cylindrical Shell ◽  
Vessel Structure ◽  
Current Design

With the increasing status of the sea, the research and manufacture of submersible vessel will be paid more attention. In order to enlarge the submergence depth and utilization efficiency of submersible vessel space, long compartment structures of high strength steels and in various forms are widely adopted. The strength problem of such structure is easy to be guaranteed, while the resulting stability problem is becoming more and more serious. For a ring-stiffened cylindrical shell structure with long compartment, one or two large stiffeners are used on the shell structure to ensure its overall stability. This paper studies the strength and stability of the long compartment cylindrical shell structure, with a special emphasis on the stability problems of overall long compartment structures and large stiffeners. The failure modes and critical load under deep water are analyzed by a theoretical method and also a finite element method. The formula for calculating the large stiffener of submersible vessel structure is derived based on the theory of elastic mechanics, and the defect and deficiency of the formula used in the current design specification is pointed out. The influence of large stiffener position and structure form on the critical pressure of submersible cylindrical shell structure is studied. The results of theoretical analysis and numerical simulation are also compared and discussed.

Elastoplastic Instability of the Double-Arc Ring-Stiffened Cylindrical Shell

2009 ◽  
Vol 419-420 ◽  
pp. 513-516
Author(s):  
Li Hong Yang ◽  
Yun Zeng He ◽  
Guang Ping Zou ◽  
Chao He
Keyword(s):  
Cylindrical Shell ◽  
Hydrostatic Pressure ◽  
Critical Pressure ◽  
Wave Number ◽  
Central Angle ◽  
Buckling Mode ◽  
Circular Arc ◽  
Geometric Imperfection ◽  
Stiffened Cylindrical Shell ◽  
Equivalent Wave

The elastoplastic instability of the symmetrical double-arc ring-stiffened cylindrical shell was analyzed. The critical pressure was obtained for small deflection elastoplastic buckling of the cylindrical shell under hydrostatic pressure. The critical pressure for large deflection buckling of the cylindrical shell with initial geometric imperfections was determined under hydrostatic pressure by using nonlinear large deformation theory. The effects of hoop equivalent wave number, initial geometric imperfection and the central angle of circular arc on buckling mode and critical pressure of double-arc ring-stiffened cylindrical shell were analyzed. The results showed that the hoop equivalent wave number of arc cylindrical shell had an main effect on the critical pressure of the structure, designed equivalent hoop wave number of double-arc cylindrical shell should not be approach to the hoop wave number corresponding to minimum critical pressure, and the central angle of circular arc had less effect on critical pressure of the structure.

On the elastic buckling of cross-ply composite closed cylindrical shell under hydrostatic pressure

2021 ◽  
Vol 227 ◽  
pp. 108633
Author(s):  
Muhammad Imran ◽  
Dongyan Shi ◽  
Lili Tong ◽  
Ahsan Elahi ◽  
Muqeem Uddin
Keyword(s):  
Cylindrical Shell ◽  
Hydrostatic Pressure ◽  
Elastic Buckling ◽  
Closed Cylindrical Shell

Buckling of Multiple-Bay Ring-Reinforced Cylindrical Shells Subject to Hydrostatic Pressure

1953 ◽  
Vol 20 (4) ◽  
pp. 469-474
Author(s):  
W. A. Nash
Keyword(s):  
Cylindrical Shell ◽  
Hydrostatic Pressure ◽  
Strain Energy ◽  
Elastic Strain Energy ◽  
Middle Surface ◽  
Elastic Buckling ◽  
Elastic Instability ◽  
Total Potential ◽  
External Forces ◽  
Work Done

Abstract An analytical solution is presented for the problem of the elastic instability of a multiple-bay ring-reinforced cylindrical shell subject to hydrostatic pressure applied in both the radial and axial directions. The method used is that of minimization of the total potential. Expressions for the elastic strain energy in the shell and also in the rings are written in terms of displacement components of a point in the middle surface of the shell. Expressions for the work done by the external forces acting on the cylinder likewise are written in terms of these displacement components. A displacement configuration for the buckled shell is introduced which is in agreement with experimental evidence, in contrast to the arbitrary patterns assumed by previous investigators. The total potential is expressed in terms of these displacement components and is then minimized. As a result of this minimization a set of linear homogeneous equations is obtained. In order that a nontrivial solution to this system of equations exists, it is necessary that the determinant of the coefficients vanish. This condition determines the critical pressure at which elastic buckling of the cylindrical shell will occur.

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