Free Vibrations of Orthotropic Cylindrical Shell on Elastic Foundation

AIAA Journal ◽  
10.2514/2.828 ◽  
1999 ◽  
Vol 37 (9) ◽  
pp. 1135-1139 ◽  
Author(s):  
D. N. Paliwal ◽  
Satyendra Singh
Keyword(s):  
Cylindrical Shell ◽  
Elastic Foundation ◽  
Orthotropic Cylindrical Shell ◽  
Free Vibrations

scholarly journals VIBRATIONS OF A LONGITUDINALLY STIFFENED, LIQUID-FILLED CYLINDRICAL SHELL IN LIQUID

2020 ◽  
Vol 2 (32) ◽  
pp. 112-131
Author(s):  
N. I. Alizadeh
Keyword(s):  
Cylindrical Shell ◽  
Wave Equation ◽  
Viscous Liquid ◽  
Orthotropic Cylindrical Shell ◽  
Ideal Liquid ◽  
Free Vibrations ◽  
Frequency Equation ◽  
Characteristic Curves

In the paper we study free vibrations of a longitudinally stiffened, viscous liquid-filled orthotropic cylindrical shell in ideal liquid. The Navier – Stokеs linearized equation is used to describe the motion of the internal viscous liquid, the motion of the external liquid is described by a wave equation written in the potential by perturbed velocity. Frequency equation of a longitudinally stiffened orthotropic, viscous liquid-contacting cylindrical shell is obtained on the basis of the Hamilton – Ostrogradsky principle of stationarity of action. Characteristic curves of dependence are constructed.

Collapse of Arteries Subjected to an External Band of Pressure

1980 ◽  
Vol 102 (1) ◽  
pp. 8-22 ◽  
Author(s):  
A. M. Hecht ◽  
H. Yeh ◽  
S. M. K. Chung
Keyword(s):  
Reynolds Number ◽  
Blood Flow ◽  
Cylindrical Shell ◽  
Orthotropic Cylindrical Shell ◽  
Reynolds Numbers ◽  
Intraluminal Pressure ◽  
Collapse Pressure ◽  
Vessel Size ◽  
Flow Reynolds Number ◽  
Small Band

Collapse of arteries subjected to a band of hydrostatic pressure of finite length is analyzed. The vessel is treated as a long, thin, linearly elastic, orthotropic cylindrical shell, homogeneous in composition, and with negligible radial stresses. Blood in the vessel is treated as a Newtonian fluid and the Reynolds number is of order 1. Results are obtained for effects of the following factors on arterial collapse: intraluminal pressure, length of the pressure band, elastic properties of the vessel, initial stress both longitudinally and circumferentially, blood flow Reynolds number, compressibility, and wall thickness to radius ratio. It is found that the predominant parameter influencing vessel collapse for the intermediate range of vessel size and blood flow Reynolds numbers studied is the preconstricted intraluminal pressure. For pressure bands less than about 10 vessel radii the collapse pressure increases sharply with increasing intraluminal pressure. Initial axial prestress is found to be highly stabilizing for small band lengths. The effects of fluid flow are found to be small for pressure bands of less than 100 vessel radii. No dramatic orthotropic vessel behavior is apparent. The analysis shows that any reduction in intraluminal pressure, such as that produced by an upstream obstruction, will significantly lower the required collapse pressure. Medical implications of this analysis to Legg-Perthes disease are discussed.

Free vibrations of noncircular cylindrical shell segments

AIAA Journal ◽  
1971 ◽  
Vol 9 (2) ◽  
pp. 239-244 ◽  
Author(s):  
CARL EDWARD KURT ◽  
DONALD EDWARD BOYD
Keyword(s):  
Cylindrical Shell ◽  
Free Vibrations ◽  
Noncircular Cylindrical Shell
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