Structural analysis of a submerged fluid-filled cylindrical shell subjected to a shock wave

Abstract The dynamic responses of a finite length cylindrical shell submerged in an infinite, inviscid, irrotational, incompressible fluid and subjected to shock waves induced to underwater explosion due to a spherical charge, are investigated in the view of method of modal superposition. Effects of shock wave pressure and hydrodynamic force are considered in shell equilibrium equations. By expanding distribution function of shock wave pressure into Fourier series and using method of Galerkin, the coupled equations of fluid-structure interaction problem are solved numerically. Finally, displacement re sponse of the shell is obtained.

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Clinical and Functional Substantiation of Combined Use of Shock-Wave and Low Frequency Pulse Electrotherapy in the Treament of the Patients with Chronic Prostatitis and Erectile Dysfunction

Journal of New Medical Technologies ◽

10.12737/3310 ◽

2014 ◽

Vol 21 (1) ◽

pp. 39-44

Author(s):

Неделько ◽

D. Nedelko ◽

Лазарев ◽

I. Lazarev

Keyword(s):

Shock Wave ◽

Erectile Dysfunction ◽

Structural Analysis ◽

Chronic Prostatitis ◽

Emotional State ◽

Low Frequency ◽

Clinical Syndromes ◽

Combined Use ◽

Methods Of Treatment ◽

Frequency Pulse

Some researchers emphasize the lack of effectiveness of the currently available methods of treatment of chronic prostatitis. Using the most modern physiotherapeutic methods, the recurrence rate is 40% during the first 1-2 years. Currently highly therapies for erectile dysfunction in patients with CP are shock-wave and frequency pulse electrotherapy, has analgesic, anti-hypoxic effects. The emergence of new physiotherapy techniques based on the achievements of the development of electronics, in particular pulse electrotherapy allowed to bring their physical characteristics to physiological parameters, thereby increasing the effectiveness of this type of electrotherapy in chronic prostatitis. In the works of pathogenetically substantiated methods of combined use of shock-wave and low-frequency pulse electrotherapy ED considering sex of the patient are absent, methodology and criteria for the effectiveness of therapy have not been developed. The author´s objective is pathogenetically justify the combined use of shock-wave and low-frequency pulse electrotherapy in treatment of erectile dysfunction in patients with chronic prostatitis on the basis of system-structural analysis. As a result of observations 40 patients, the authors proved that under the influence of the shock-wave and pulse electrotherapy in patients with chronic prostatitis, the leading clinical syndromes cropped, psycho-emotional state, the functional activity of the pituitary-adrenel-testicular system, clinical and functional state of components of the copulative cycle normalized.

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

Journal of Applied Mechanics ◽

10.1115/1.3422831 ◽

1972 ◽

Vol 39 (4) ◽

pp. 1072-1078 ◽

Cited By ~ 1

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.

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A Numerical Method for Blast Shock Wave Analysis of Missile Launch from Aircraft

International Journal of Aerospace Engineering ◽

10.1155/2015/897213 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 4

Author(s):

Sebastian Heimbs ◽

Josef Ritzer ◽

Johannes Markmiller

Keyword(s):

Shock Wave ◽

Structural Analysis ◽

Numerical Method ◽

Experimental Test ◽

Test Series ◽

Shock Wave Loading ◽

Wave Loading ◽

Wave Analysis ◽

Military Aircraft ◽

Laboratory Environment

An efficient empirical approach was developed to accurately represent the blast shock wave loading resulting from the launch of a missile from a military aircraft to be used in numerical analyses. Based on experimental test series of missile launches in laboratory environment and from a helicopter, equations were derived to predict the time- and position-dependent overpressure. The method was finally applied and validated in a structural analysis of a helicopter tail boom under missile launch shock wave loading.

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