Structural Analysis for Spherical Pressure Hull of Deep Manned Submersible

2015 ◽  
Vol 20 (4) ◽  
pp. 412-419
Author(s):  
Hanmin Lee ◽  
Seong-Whan Park ◽  
Jai-Kyung Lee
Keyword(s):  
Structural Analysis ◽  
Manned Submersible ◽  
Spherical Pressure

Structural analysis of spherical pressure hull viewport for manned submersibles using biological growth method

2018 ◽  
Vol 13 (6) ◽  
pp. 601-616 ◽  
Author(s):  
Pranesh SB ◽  
Deepak Kumar ◽  
Anantha Subramanian V ◽  
Sathianarayanan D ◽  
Ramadass GA
Keyword(s):  
Structural Analysis ◽  
Biological Growth ◽  
Growth Method ◽  
Spherical Pressure

Acrylic spherical pressure hull for Manned Submersible

2020 ◽  
Author(s):  
Nitin Singh Rajput ◽  
S.B. Pranesh ◽  
D. Sathianarayanan ◽  
G.A. Ramadass
Keyword(s):  
Manned Submersible ◽  
Spherical Pressure

scholarly journals Non-linear buckling analysis of imperfect thin spherical pressure hull for manned submersible

2017 ◽  
Vol 2 (4) ◽  
pp. 293-300 ◽  
Author(s):  
SB. Pranesh ◽  
Deepak Kumar ◽  
V. Anantha Subramanian ◽  
D. Sathianarayanan ◽  
GA. Ramadass
Keyword(s):  
Buckling Analysis ◽  
Linear Buckling ◽  
Non Linear ◽  
Manned Submersible ◽  
Linear Buckling Analysis ◽  
Spherical Pressure

Acrylic Plastic Spherical Pressure Hull for 2439 m (8000 ft) Design Depth: Phase I

1987 ◽  
Vol 109 (1) ◽  
pp. 40-47 ◽  
Author(s):  
J. D. Stachiw ◽  
A. Clark ◽  
C. B. Brenn
Keyword(s):  
Phase I ◽  
Scale Model ◽  
Test Plan ◽  
Short Term ◽  
Acrylic Plastic ◽  
Hull Design ◽  
Manned Submersible ◽  
Design Depth ◽  
Different Diameters ◽  
Spherical Pressure

A program has been initiated to provide the oceanographic community with a manned submersible with panoramic visibility for 2439 m (8000 ft) design depth. The first phase of the program is to validate the design of the acrylic plastic pressure hull utilizing model scale spheres with different diameters and thickness to inside diameter (t/Di) ratios. This papers summarizes 1) the criteria used in the design of the acrylic plastic hull for 2439 m (8000 ft) depth, 2) the experimental test plan for validation of the hull design, and 3) the fabrication, and short-term pressurization to destruction of the first scale model with an aluminum hatch. The 457-mm (18-in.) o.d. acrylic sphere with t/Di ratio of 0.2 successfully withstood 1-hr long pressurizations from 0 to 6.9, 13.8, 20.7, 27.6, 34.4 and 41.3 MPa (1000, 2000, 3000, 4000, 5000, and 6000 psi) followed by 1-hr long relaxation periods after each pressurization prior to imploding at 110.2 MPa (16,000 psi) under 4.5 MPa/min (650 psi/min) pressurization. The selected t/Di ratio 0.2 appears to exceed the design depth requirement for 2439 m (8000 ft).

Manufacturing Imperfection Sensitivity Analysis of Spherical Pressure Hull for Manned Submersible

2013 ◽  
Vol 47 (6) ◽  
pp. 64-72 ◽  
Author(s):  
Bhaskaran Pranesh ◽  
Dharmaraj Sathianarayanan ◽  
Sethuraman Ramesh ◽  
Gidugu Ananda Ramadass
Keyword(s):  
Numerical Analysis ◽  
Parametric Design ◽  
External Pressure ◽  
Imperfection Sensitivity ◽  
Element Analysis ◽  
Allowable Deviation ◽  
Buckling Behavior ◽  
Manufacturing Procedure ◽  
Manned Submersible ◽  
Spherical Pressure

AbstractAny pressure hull invariably has imperfections as a result of the manufacturing procedure. Imperfections in a spherical pressure hull are the basis for localized buckling and deformation behavior. Numerical analysis and analytical calculations are carried out to predict the buckling behavior and strength of a pressure hull made of titanium alloy (Ti-6Al-4V) for both perfect and imperfect pressure hulls. Finite element analysis is carried out for different imperfection angles to see the effect on strength and buckling. Results of numerical analysis show that there is considerable reduction in both buckling pressure and strength as a result of imperfections. Hence, allowable deviation due to imperfection for a spherical pressure hull has to be considered for thickness calculations.Abbreviations:P  external pressure (Design pressure)Dm  mean diameter of the pressure hullRm  mean radius of the pressure hullRi  imperfect radius of the pressure hullt  thickness of the pressure hullΔR  imperfect deviationδ  imperfection angleσ  hoop stressPy  pressure at yield strength of the materialPb  buckling pressureE  Young’s modulus of the materialμ  Poisson’s ratioMSW  meters of sea waterAPDL  ANSYS Parametric Design Language

Damage tolerance design of a manned submersible spherical pressure hull

2015 ◽  
Author(s):  
D. Sathia Narayanan ◽  
S.B. Pranesh ◽  
S. Ramesh ◽  
G. A. Ramadass ◽  
M.A. Atmanand
Keyword(s):  
Damage Tolerance ◽  
Tolerance Design ◽  
Manned Submersible ◽  
Spherical Pressure

Structural analysis of the surface-layer protein of spirillum serpens by high-resolution electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 738-739
Author(s):  
W. H. Wu ◽  
R. M. Glaeser
Keyword(s):  
Electron Microscopy ◽  
Surface Layer ◽  
Structural Analysis ◽  
High Resolution ◽  
Low Dose ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Surface Layer Protein ◽  
Morphological Unit ◽  
Resolution Electron

Spirillum serpens possesses a surface layer protein which exhibits a regular hexagonal packing of the morphological subunits. A morphological model of the structure of the protein has been proposed at a resolution of about 25 Å, in which the morphological unit might be described as having the appearance of a flared-out, hollow cylinder with six ÅspokesÅ at the flared end. In order to understand the detailed association of the macromolecules, it is necessary to do a high resolution structural analysis. Large, single layered arrays of the surface layer protein have been obtained for this purpose by means of extensive heating in high CaCl2, a procedure derived from that of Buckmire and Murray. Low dose, low temperature electron microscopy has been applied to the large arrays.As a first step, the samples were negatively stained with neutralized phosphotungstic acid, and the specimens were imaged at 40,000 magnification by use of a high resolution cold stage on a JE0L 100B. Low dose images were recorded with exposures of 7-9 electrons/Å2. The micrographs obtained (Fig. 1) were examined by use of optical diffraction (Fig. 2) to tell what areas were especially well ordered.

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