627 Stability of Axial Annular Flow-Induced Vibration of Thin Cylindrical Shell by Flugge's Shell Theory

In this paper, the stability of a thin cylindrical shell subjected to axial leakage flow is discussed. In this paper, the second part of a study of the axial leakage flow-induced vibration of a thin cylindrical shell, we focus on lateral vibration, that is, the beamlike vibration of a shell. The coupled equations between a shell and a fluid are obtained by using the Donnell’s shell theory and the Navier-Stokes equation as same as the former paper. The influence of the axial velocity on the unstable vibration phenomena is clarified concerning the beamlike vibration mode of a shell. The numerical results on shell theory are compared with the ones on beam theory which have been already reported by the authors; and the numerical parameter studies are done for various dimensions of a shell and a fluid.

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Axial Leakage Flow-Induced Vibration of Thin Cylindrical Shell With Respect to Circumferential Vibration

5th International Symposium on Fluid Structure International, Aeroeslasticity, and Flow Induced Vibration and Noise ◽

10.1115/imece2002-32218 ◽

2002 ◽

Author(s):

Katsuhisa Fujita ◽

Atsuhiko Shintani ◽

Masakazu Ono

Keyword(s):

Cylindrical Shell ◽

Equations Of Motion ◽

Fluid Pressure ◽

Navier Stokes ◽

Leakage Flow ◽

Thin Cylindrical Shell ◽

Flow Induced Vibration ◽

Navier Stokes Equation ◽

Coupled Equations ◽

Unstable Vibration

In this paper, the dynamic stability of a thin cylindrical shell subjected to axial leakage flow is discussed. In this paper, the third part of a study of the axial leakage flow-induced vibration of a thin cylindrical shell, we focus on circumferential vibration, that is, the ovaling vibration of a shell. The coupled equations of motion between shell and liquid are obtained by using Donnell’s shell theory and the Navier-Stokes equation. The added mass, added damping and added stiffness in the coupled equations of motion are described by utilizing the unsteady fluid pressure acting on the shell. The relations between axial velocity and the unstable vibration phenomena are clarified concerning the circumferential vibration of a shell. Numerical parametric studies are done for various dimensions of a shell and an axial leakage flow.

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Quantification of Arterial Stiffness Reduced Effect of Vessel Geometry

Volume 2: Biomedical and Biotechnology Engineering ◽

10.1115/imece2008-67086 ◽

2008 ◽

Author(s):

Shinichiro Ota ◽

Toshitaka Yasuda ◽

Takashi Saito

Keyword(s):

Mechanical Properties ◽

Cylindrical Shell ◽

Arterial Stiffness ◽

Wall Thickness ◽

Shell Theory ◽

Dynamic Strain ◽

Thin Cylindrical Shell ◽

Inner Pressure ◽

Latex Tube ◽

Mechanical Factors

Arteriosclerosis is such as phenomena hardening of arteries, with thickening and loss of elasticity. Previous indexes include effect of geometric and mechanical factors as the radius, the wall thickness and mechanical properties of arteries. In this study, we proposed viscoelasticity indexes formulated by thin cylindrical shell theory estimated dynamic strain, and this index was independent of wall thickness and radius of arterial vessels. To confirm the validity of these indexes, we evaluated the parameters of viscoelasticity using the latex tube with different wall thickness of blood vessel model. We measured a radius of the latex tube and an inner pressure maintained by a pulsatile pump in a mock circuit filled with the water. Estimating the parameters of elasticity using these measured values, we concluded that a proposal index was independent of the wall thickness of the artery.

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Stability of Axial Leakage Flow-induced Vibration of Thin Cylindrical Shell

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2000.1.0_937 ◽

2000 ◽

Vol 2000.1 (0) ◽

pp. 937-938

Author(s):

Katsuhisa FUJITA ◽

Atsuhiko SHINTANI ◽

Masakazu ONO

Keyword(s):

Cylindrical Shell ◽

Leakage Flow ◽

Thin Cylindrical Shell ◽

Flow Induced Vibration

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Axial Leakage Flow-Induced Vibration of a Thin Cylindrical Shell With Respect to Axisymmetric Vibration

Journal of Pressure Vessel Technology ◽

10.1115/1.1564071 ◽

2003 ◽

Vol 125 (2) ◽

pp. 151-157 ◽

Cited By ~ 4

Author(s):

Katsuhisa Fujita ◽

Atsuhiko Shintani ◽

Masakazu Ono

Keyword(s):

Cylindrical Shell ◽

Axial Flow ◽

Navier Stokes ◽

Leakage Flow ◽

Axisymmetric Vibration ◽

Thin Cylindrical Shell ◽

Flow Induced Vibration ◽

Navier Stokes Equation ◽

Coupled Equations ◽

Stiffness Matrices

In this paper, the stability of a thin cylindrical shell subjected to axial leakage flow is discussed. In this paper, the first part of a study of the axial leakage flow-induced vibration of a thin cylindrical shell, we focus on axisymmetric vibration, that is, the ringlike vibration of a shell. The coupled equations between a shell and a fluid are obtained by using the Donnell’s shell theory and the Navier-Stokes equation. The added mass, added damping and added stiffness matrices in the coupled equations are described by utilizing unsteady fluid forces on a shell. The influence of the axial flow velocity on the unstable phenomena is clarified concerning axisymmetric vibration mode of shell. The numerical calculations are performed taking the dimensions of shell and fluid as parameters.

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Non-Axisymmetric Dynamic Response of Imperfectly Bonded Buried Orthotropic Thin Empty Cylindrical Shell Due to Incident Shear Wave (SH Wave)

International Journal of Geotechnical Earthquake Engineering ◽

10.4018/jgee.2011070104 ◽

2011 ◽

Vol 2 (2) ◽

pp. 40-56

Author(s):

Rakesh Singh Rajput ◽

Sunil Kumar ◽

Alok Chaubey ◽

J. P. Dwivedi

Keyword(s):

Cylindrical Shell ◽

Dynamic Response ◽

Shear Wave ◽

Shell Theory ◽

Surrounding Medium ◽

Sh Wave ◽

Thin Cylindrical Shell ◽

Sh Waves ◽

Stiffness And Damping ◽

Thin Shell Theory

Non-axisymmetric dynamic response of imperfectly bonded buried orthotropic thin empty pipelines subjected to incident shear wave (SH-wave) is presented here. In the thin shell theory the effect of shear deformation and rotary inertia is not considered. The pipeline has been modeled as an infinite thin cylindrical shell imperfectly bonded to surrounding. A thin layer is assumed between the shell and the surrounding medium (soil) such that this layer possesses the properties of stiffness and damping both. The degree of imperfection of the bond is varied by changing the stiffness and the damping parameters of this layer. Although a general formulation including P-, SV-, and SH-wave excitations are presented, numerical results are given for the case of incident SH-waves only. Comparison of axisymmetric and non-axisymmetric responses are also furnished.

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