Ring‐shell projector

1990 ◽  
Vol 87 (4) ◽  
pp. 1834-1834
Author(s):  
Garfield W. McMahon
Keyword(s):  
Ring Shell

Analysis of Uniform Deep Oval Reinforcing Rings

1964 ◽  
Vol 8 (02) ◽  
pp. 21-28 ◽  
Author(s):  
William P. Vafakos
Keyword(s):  
Hydrostatic Pressure ◽  
Cross Section ◽  
Composite Structure ◽  
Reference Line ◽  
Taylor Model ◽  
Test Results ◽  
Local Curvature ◽  
Oval Cross Section ◽  
Ring Shell ◽  
Good Agreement

Equations which are applicable to uniform deep oval rings in which the local curvature of an arbitrary reference line is prescribed are derived and simplified for application to oval ring-shell combinations. Theoretical estimates of the stresses and displacements are obtained for a typical reinforcing ring of a ring-stiffened oval cylinder recently tested under hydrostatic pressure by the David Taylor Model Basin. These results are obtained by appropriately approximating the oval cross section and by assuming that the composite structure responds as an oval ring. The theoretical flange stresses are shown to be in good agreement with available test results.

Control Effectiveness of Segmented Actuators Laminated on Ring-Shells

1997 ◽  
Author(s):  
R. Ye ◽  
H. Bahrami ◽  
H. S. Tzou
Keyword(s):  
Finite Element ◽  
Distributed Control ◽  
Piezoelectric Actuators ◽  
Shell Element ◽  
Circular Ring ◽  
Control Effectiveness ◽  
Triangular Shell Element ◽  
Circular Ring Shell ◽  
System Equations ◽  
Ring Shell

Abstract Distributed control effectiveness of ring-shells laminated with segmented actuators is investigated in this paper. A new laminated quadratic piezoelastic triangular shell FE is developed using the layerwise constant shear angle theory. Element and system equations are also derived. The developed piezoelastic triangular shell element is used to model a semi-circular ring shell with various segments of distributed piezoelectric actuators. Finite element (triangular shell FE) solutions are compared with the theoretical, experimental, and finite element first. Natural frequencies and distributed control effects of the ring shell with different length of piezoelectric actuators are also studied. Control effectiveness is evaluated and optimal length of the actuator is recommended.

Plastic General Instability of Ring—Reinforced Conical Shells Under Uniform External Pressure

2007 ◽  
Vol 44 (04) ◽  
pp. 268-277
Author(s):  
Carl T.F. Ross ◽  
Andrew P. F. Little ◽  
Robert Allsop ◽  
Charles Smith ◽  
Marcus Engelhardt
Keyword(s):  
Experimental Tests ◽  
External Pressure ◽  
Elastic Buckling ◽  
Conical Shells ◽  
Uniform External Pressure ◽  
Design Chart ◽  
Circular Conical Shells ◽  
High Degree ◽  
Very High ◽  
Ring Shell

The paper describes experimental tests carried out on three ring-reinforced circular conical shells that suffered plastic general instability under uniform external pressure. In this mode, the entire ring-shell combination buckles bodily in its flank. The cones were carefully machined from EN1A mild steel to a very high degree of precision. The paper also provides a design chart using the results obtained from these three vessels, together with the results of nine other vessels obtained from other tests. All 12 vessels failed by general instability. The design chart allows the possibility of obtaining a plastic knockdown factor, so that the theoretical elastic buckling pressures for perfect vessels can be divided by the plastic knockdown factor, to give the predicted buckling pressure. This method can also be used for the design of full-scale vessels.

Two-dimensional mesoscopic vortex clusters in a superconducting ring: Shell structure and melting

2002 ◽  
Vol 44 (1) ◽  
pp. 22-29
Author(s):  
Yu. E. Lozovik ◽  
E. A. Rakoch ◽  
S. Yu. Volkov
Keyword(s):  
Shell Structure ◽  
Two Dimensional ◽  
Superconducting Ring ◽  
Ring Shell

scholarly journals Ring/Shell Ion Distributions at Geosynchronous Orbit

2017 ◽  
Vol 122 (12) ◽  
pp. 12,055-12,071 ◽  
Author(s):  
M. F. Thomsen ◽  
M. H. Denton ◽  
S. P. Gary ◽  
Kaijun Liu ◽  
Kyungguk Min
Keyword(s):  
Geosynchronous Orbit ◽  
Ion Distributions ◽  
Ring Shell
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