Poisson coupling in the in vacuo dynamics of an infinite cylindrical shell

2013 ◽  
Vol 133 (5) ◽  
pp. 3385-3385
Author(s):  
Rudolph Martinez
Keyword(s):  
Cylindrical Shell ◽  
Infinite Cylindrical Shell ◽  
Poisson Coupling

Power Flow and Sound Radiation of a Submerged Cylindrical Shell with Internal Structural

2011 ◽  
Vol 105-107 ◽  
pp. 321-325 ◽  
Author(s):  
Jin Yan ◽  
Juan Zhang
Keyword(s):  
Cylindrical Shell ◽  
Power Flow ◽  
Coupled System ◽  
Engineering Practice ◽  
Coupling Condition ◽  
Space Harmonics ◽  
In Series ◽  
Infinite Cylindrical Shell ◽  
Radiated Sound ◽  
Vibrational Power Flow

The vibrational power flow in a submerged infinite cylindrical shell with internal rings and bulkheads are studied analytically. The harmonic motion of the shell and the pressure field in the fluid is described by Flügge shell theory and Helmholtz equation, respectively. The coupling condition on the outer surface of the shell wall is introduced to obtain the vibrational equation of this coupled system. Both four kinds of forces (moments) between rings and shell and between bulkheads and shell are considered. The solution is obtained in series form by expanding the system responses in terms of the space harmonics of the spacing of both ring stiffeners and bulkheads. The vibrational power flow and radiated sound power are obtained and the influences of various complicating effects such as the ring, bulkhead and fluid loading on the results are analyzed. The analytic model is close to engineering practice, which will be valuable to the application on noise and vibration control of submarines and underwater pipes.

The Critical Velocity for an Infinite Cylindrical Shell under a Moving Load

2013 ◽  
Vol 441 ◽  
pp. 461-464
Author(s):  
Jiu Dan Zhang ◽  
Bin Zhen ◽  
Xiang Li
Keyword(s):  
Cylindrical Shell ◽  
Longitudinal Wave ◽  
Critical Velocity ◽  
Wave Velocity ◽  
Moving Load ◽  
Longitudinal Wave Velocity ◽  
Real Roots ◽  
Infinite Cylindrical Shell ◽  
Critical Velocities ◽  
Sign Method

The critical velocity for an infinite cylindrical shell subjected a moving load with a constant velocity is analyzed in this paper. It is found that the critical velocity problem can be translated into a distribution of the real roots of a quadruplicate equation, which can be solved by using Descartes sign method and complete discrimination system for polynomials. Our research shows that the number of the critical velocities for an infinite cylindrical shell always is even number. Furthermore the longitudinal wave velocity is not one critical velocity for the shell. Our results are different from the conclusion drawn by other authors that there are three critical velocities in an infinite shell, and the longitudinal wave velocity is the maximum critical velocity. Then further studies are needed to clarify these questions.

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